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![Guo Xuenan](/assets/img/avatar_default.png)
Fix uaf in xfs_trans_ail_delete during xlog force shutdown. In commitcd6f79d1fb
("xfs: run callbacks before waking waiters in xlog_state_shutdown_callbacks") changed the order of running callbacks and wait for iclog completion to avoid unmount path untimely destroy AIL. But which seems not enough to ensue this, adding mdelay in `xfs_buf_item_unpin` can prove that. The reproduction is as follows. To ensure destroy AIL safely, we should wait all xlog ioend workers done and sync the AIL. ================================================================== BUG: KASAN: use-after-free in xfs_trans_ail_delete+0x240/0x2a0 Read of size 8 at addr ffff888023169400 by task kworker/1:1H/43 CPU: 1 PID: 43 Comm: kworker/1:1H Tainted: G W 6.1.0-rc1-00002-gc28266863c4a #137 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: xfs-log/sda xlog_ioend_work Call Trace: <TASK> dump_stack_lvl+0x4d/0x66 print_report+0x171/0x4a6 kasan_report+0xb3/0x130 xfs_trans_ail_delete+0x240/0x2a0 xfs_buf_item_done+0x7b/0xa0 xfs_buf_ioend+0x1e9/0x11f0 xfs_buf_item_unpin+0x4c8/0x860 xfs_trans_committed_bulk+0x4c2/0x7c0 xlog_cil_committed+0xab6/0xfb0 xlog_cil_process_committed+0x117/0x1e0 xlog_state_shutdown_callbacks+0x208/0x440 xlog_force_shutdown+0x1b3/0x3a0 xlog_ioend_work+0xef/0x1d0 process_one_work+0x6f9/0xf70 worker_thread+0x578/0xf30 kthread+0x28c/0x330 ret_from_fork+0x1f/0x30 </TASK> Allocated by task 9606: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7a/0x90 __kmalloc+0x59/0x140 kmem_alloc+0xb2/0x2f0 xfs_trans_ail_init+0x20/0x320 xfs_log_mount+0x37e/0x690 xfs_mountfs+0xe36/0x1b40 xfs_fs_fill_super+0xc5c/0x1a70 get_tree_bdev+0x3c5/0x6c0 vfs_get_tree+0x85/0x250 path_mount+0xec3/0x1830 do_mount+0xef/0x110 __x64_sys_mount+0x150/0x1f0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 9662: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x40 __kasan_slab_free+0x105/0x1a0 __kmem_cache_free+0x99/0x2d0 kvfree+0x3a/0x40 xfs_log_unmount+0x60/0xf0 xfs_unmountfs+0xf3/0x1d0 xfs_fs_put_super+0x78/0x300 generic_shutdown_super+0x151/0x400 kill_block_super+0x9a/0xe0 deactivate_locked_super+0x82/0xe0 deactivate_super+0x91/0xb0 cleanup_mnt+0x32a/0x4a0 task_work_run+0x15f/0x240 exit_to_user_mode_prepare+0x188/0x190 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x42/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888023169400 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff888023169400, ffff888023169480) The buggy address belongs to the physical page: page:ffffea00008c5a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888023168f80 pfn:0x23168 head:ffffea00008c5a00 order:1 compound_mapcount:0 compound_pincount:0 flags: 0x1fffff80010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff) raw: 001fffff80010200 ffffea00006b3988 ffffea0000577a88 ffff88800f842ac0 raw: ffff888023168f80 0000000000150007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888023169300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888023169380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888023169400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023169480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888023169500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint Fixes:cd6f79d1fb
("xfs: run callbacks before waking waiters in xlog_state_shutdown_callbacks") Signed-off-by: Guo Xuenan <guoxuenan@huawei.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
3923 lines
111 KiB
C
3923 lines
111 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_errortag.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_log.h"
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#include "xfs_log_priv.h"
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#include "xfs_trace.h"
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#include "xfs_sysfs.h"
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#include "xfs_sb.h"
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#include "xfs_health.h"
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struct kmem_cache *xfs_log_ticket_cache;
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/* Local miscellaneous function prototypes */
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STATIC struct xlog *
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xlog_alloc_log(
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struct xfs_mount *mp,
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struct xfs_buftarg *log_target,
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xfs_daddr_t blk_offset,
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int num_bblks);
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STATIC int
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xlog_space_left(
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struct xlog *log,
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atomic64_t *head);
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STATIC void
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xlog_dealloc_log(
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struct xlog *log);
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/* local state machine functions */
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STATIC void xlog_state_done_syncing(
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struct xlog_in_core *iclog);
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STATIC void xlog_state_do_callback(
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struct xlog *log);
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STATIC int
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xlog_state_get_iclog_space(
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struct xlog *log,
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int len,
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struct xlog_in_core **iclog,
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struct xlog_ticket *ticket,
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int *logoffsetp);
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STATIC void
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xlog_grant_push_ail(
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struct xlog *log,
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int need_bytes);
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STATIC void
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xlog_sync(
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struct xlog *log,
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struct xlog_in_core *iclog,
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struct xlog_ticket *ticket);
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#if defined(DEBUG)
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STATIC void
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xlog_verify_grant_tail(
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struct xlog *log);
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STATIC void
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xlog_verify_iclog(
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struct xlog *log,
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struct xlog_in_core *iclog,
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int count);
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STATIC void
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xlog_verify_tail_lsn(
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struct xlog *log,
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struct xlog_in_core *iclog);
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#else
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#define xlog_verify_grant_tail(a)
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#define xlog_verify_iclog(a,b,c)
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#define xlog_verify_tail_lsn(a,b)
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#endif
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STATIC int
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xlog_iclogs_empty(
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struct xlog *log);
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static int
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xfs_log_cover(struct xfs_mount *);
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/*
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* We need to make sure the buffer pointer returned is naturally aligned for the
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* biggest basic data type we put into it. We have already accounted for this
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* padding when sizing the buffer.
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*
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* However, this padding does not get written into the log, and hence we have to
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* track the space used by the log vectors separately to prevent log space hangs
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* due to inaccurate accounting (i.e. a leak) of the used log space through the
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* CIL context ticket.
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*
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* We also add space for the xlog_op_header that describes this region in the
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* log. This prepends the data region we return to the caller to copy their data
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* into, so do all the static initialisation of the ophdr now. Because the ophdr
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* is not 8 byte aligned, we have to be careful to ensure that we align the
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* start of the buffer such that the region we return to the call is 8 byte
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* aligned and packed against the tail of the ophdr.
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*/
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void *
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xlog_prepare_iovec(
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struct xfs_log_vec *lv,
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struct xfs_log_iovec **vecp,
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uint type)
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{
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struct xfs_log_iovec *vec = *vecp;
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struct xlog_op_header *oph;
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uint32_t len;
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void *buf;
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if (vec) {
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ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs);
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vec++;
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} else {
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vec = &lv->lv_iovecp[0];
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}
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len = lv->lv_buf_len + sizeof(struct xlog_op_header);
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if (!IS_ALIGNED(len, sizeof(uint64_t))) {
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lv->lv_buf_len = round_up(len, sizeof(uint64_t)) -
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sizeof(struct xlog_op_header);
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}
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vec->i_type = type;
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vec->i_addr = lv->lv_buf + lv->lv_buf_len;
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oph = vec->i_addr;
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oph->oh_clientid = XFS_TRANSACTION;
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oph->oh_res2 = 0;
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oph->oh_flags = 0;
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buf = vec->i_addr + sizeof(struct xlog_op_header);
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ASSERT(IS_ALIGNED((unsigned long)buf, sizeof(uint64_t)));
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*vecp = vec;
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return buf;
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}
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static void
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xlog_grant_sub_space(
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struct xlog *log,
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atomic64_t *head,
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int bytes)
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{
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int64_t head_val = atomic64_read(head);
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int64_t new, old;
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do {
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int cycle, space;
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xlog_crack_grant_head_val(head_val, &cycle, &space);
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space -= bytes;
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if (space < 0) {
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space += log->l_logsize;
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cycle--;
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}
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old = head_val;
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new = xlog_assign_grant_head_val(cycle, space);
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head_val = atomic64_cmpxchg(head, old, new);
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} while (head_val != old);
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}
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static void
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xlog_grant_add_space(
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struct xlog *log,
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atomic64_t *head,
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int bytes)
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{
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int64_t head_val = atomic64_read(head);
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int64_t new, old;
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do {
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int tmp;
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int cycle, space;
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xlog_crack_grant_head_val(head_val, &cycle, &space);
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tmp = log->l_logsize - space;
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if (tmp > bytes)
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space += bytes;
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else {
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space = bytes - tmp;
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cycle++;
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}
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old = head_val;
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new = xlog_assign_grant_head_val(cycle, space);
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head_val = atomic64_cmpxchg(head, old, new);
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} while (head_val != old);
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}
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STATIC void
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xlog_grant_head_init(
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struct xlog_grant_head *head)
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{
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xlog_assign_grant_head(&head->grant, 1, 0);
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INIT_LIST_HEAD(&head->waiters);
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spin_lock_init(&head->lock);
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}
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STATIC void
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xlog_grant_head_wake_all(
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struct xlog_grant_head *head)
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{
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struct xlog_ticket *tic;
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spin_lock(&head->lock);
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list_for_each_entry(tic, &head->waiters, t_queue)
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wake_up_process(tic->t_task);
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spin_unlock(&head->lock);
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}
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static inline int
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xlog_ticket_reservation(
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struct xlog *log,
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struct xlog_grant_head *head,
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struct xlog_ticket *tic)
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{
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if (head == &log->l_write_head) {
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ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
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return tic->t_unit_res;
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}
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if (tic->t_flags & XLOG_TIC_PERM_RESERV)
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return tic->t_unit_res * tic->t_cnt;
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return tic->t_unit_res;
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}
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STATIC bool
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xlog_grant_head_wake(
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struct xlog *log,
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struct xlog_grant_head *head,
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int *free_bytes)
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{
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struct xlog_ticket *tic;
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int need_bytes;
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bool woken_task = false;
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list_for_each_entry(tic, &head->waiters, t_queue) {
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/*
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* There is a chance that the size of the CIL checkpoints in
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* progress at the last AIL push target calculation resulted in
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* limiting the target to the log head (l_last_sync_lsn) at the
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* time. This may not reflect where the log head is now as the
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* CIL checkpoints may have completed.
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*
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* Hence when we are woken here, it may be that the head of the
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* log that has moved rather than the tail. As the tail didn't
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* move, there still won't be space available for the
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* reservation we require. However, if the AIL has already
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* pushed to the target defined by the old log head location, we
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* will hang here waiting for something else to update the AIL
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* push target.
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*
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* Therefore, if there isn't space to wake the first waiter on
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* the grant head, we need to push the AIL again to ensure the
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* target reflects both the current log tail and log head
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* position before we wait for the tail to move again.
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*/
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need_bytes = xlog_ticket_reservation(log, head, tic);
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if (*free_bytes < need_bytes) {
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if (!woken_task)
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xlog_grant_push_ail(log, need_bytes);
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return false;
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}
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*free_bytes -= need_bytes;
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trace_xfs_log_grant_wake_up(log, tic);
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wake_up_process(tic->t_task);
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woken_task = true;
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}
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return true;
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}
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STATIC int
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xlog_grant_head_wait(
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struct xlog *log,
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struct xlog_grant_head *head,
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struct xlog_ticket *tic,
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int need_bytes) __releases(&head->lock)
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__acquires(&head->lock)
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{
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list_add_tail(&tic->t_queue, &head->waiters);
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do {
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if (xlog_is_shutdown(log))
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goto shutdown;
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xlog_grant_push_ail(log, need_bytes);
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__set_current_state(TASK_UNINTERRUPTIBLE);
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spin_unlock(&head->lock);
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XFS_STATS_INC(log->l_mp, xs_sleep_logspace);
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trace_xfs_log_grant_sleep(log, tic);
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schedule();
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trace_xfs_log_grant_wake(log, tic);
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spin_lock(&head->lock);
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if (xlog_is_shutdown(log))
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goto shutdown;
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} while (xlog_space_left(log, &head->grant) < need_bytes);
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list_del_init(&tic->t_queue);
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return 0;
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shutdown:
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list_del_init(&tic->t_queue);
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return -EIO;
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}
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/*
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* Atomically get the log space required for a log ticket.
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*
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* Once a ticket gets put onto head->waiters, it will only return after the
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* needed reservation is satisfied.
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*
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* This function is structured so that it has a lock free fast path. This is
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* necessary because every new transaction reservation will come through this
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* path. Hence any lock will be globally hot if we take it unconditionally on
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* every pass.
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*
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* As tickets are only ever moved on and off head->waiters under head->lock, we
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* only need to take that lock if we are going to add the ticket to the queue
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* and sleep. We can avoid taking the lock if the ticket was never added to
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* head->waiters because the t_queue list head will be empty and we hold the
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* only reference to it so it can safely be checked unlocked.
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*/
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STATIC int
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xlog_grant_head_check(
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struct xlog *log,
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struct xlog_grant_head *head,
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struct xlog_ticket *tic,
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int *need_bytes)
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{
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int free_bytes;
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int error = 0;
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ASSERT(!xlog_in_recovery(log));
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/*
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* If there are other waiters on the queue then give them a chance at
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* logspace before us. Wake up the first waiters, if we do not wake
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* up all the waiters then go to sleep waiting for more free space,
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* otherwise try to get some space for this transaction.
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*/
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*need_bytes = xlog_ticket_reservation(log, head, tic);
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free_bytes = xlog_space_left(log, &head->grant);
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if (!list_empty_careful(&head->waiters)) {
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spin_lock(&head->lock);
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if (!xlog_grant_head_wake(log, head, &free_bytes) ||
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free_bytes < *need_bytes) {
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error = xlog_grant_head_wait(log, head, tic,
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*need_bytes);
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}
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spin_unlock(&head->lock);
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} else if (free_bytes < *need_bytes) {
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spin_lock(&head->lock);
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error = xlog_grant_head_wait(log, head, tic, *need_bytes);
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spin_unlock(&head->lock);
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}
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return error;
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}
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bool
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xfs_log_writable(
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struct xfs_mount *mp)
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{
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/*
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* Do not write to the log on norecovery mounts, if the data or log
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* devices are read-only, or if the filesystem is shutdown. Read-only
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* mounts allow internal writes for log recovery and unmount purposes,
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* so don't restrict that case.
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*/
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if (xfs_has_norecovery(mp))
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return false;
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if (xfs_readonly_buftarg(mp->m_ddev_targp))
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return false;
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if (xfs_readonly_buftarg(mp->m_log->l_targ))
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return false;
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if (xlog_is_shutdown(mp->m_log))
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return false;
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return true;
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}
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/*
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* Replenish the byte reservation required by moving the grant write head.
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*/
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int
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xfs_log_regrant(
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struct xfs_mount *mp,
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struct xlog_ticket *tic)
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{
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struct xlog *log = mp->m_log;
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int need_bytes;
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int error = 0;
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if (xlog_is_shutdown(log))
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return -EIO;
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XFS_STATS_INC(mp, xs_try_logspace);
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/*
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* This is a new transaction on the ticket, so we need to change the
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* transaction ID so that the next transaction has a different TID in
|
|
* the log. Just add one to the existing tid so that we can see chains
|
|
* of rolling transactions in the log easily.
|
|
*/
|
|
tic->t_tid++;
|
|
|
|
xlog_grant_push_ail(log, tic->t_unit_res);
|
|
|
|
tic->t_curr_res = tic->t_unit_res;
|
|
if (tic->t_cnt > 0)
|
|
return 0;
|
|
|
|
trace_xfs_log_regrant(log, tic);
|
|
|
|
error = xlog_grant_head_check(log, &log->l_write_head, tic,
|
|
&need_bytes);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
|
|
trace_xfs_log_regrant_exit(log, tic);
|
|
xlog_verify_grant_tail(log);
|
|
return 0;
|
|
|
|
out_error:
|
|
/*
|
|
* If we are failing, make sure the ticket doesn't have any current
|
|
* reservations. We don't want to add this back when the ticket/
|
|
* transaction gets cancelled.
|
|
*/
|
|
tic->t_curr_res = 0;
|
|
tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Reserve log space and return a ticket corresponding to the reservation.
|
|
*
|
|
* Each reservation is going to reserve extra space for a log record header.
|
|
* When writes happen to the on-disk log, we don't subtract the length of the
|
|
* log record header from any reservation. By wasting space in each
|
|
* reservation, we prevent over allocation problems.
|
|
*/
|
|
int
|
|
xfs_log_reserve(
|
|
struct xfs_mount *mp,
|
|
int unit_bytes,
|
|
int cnt,
|
|
struct xlog_ticket **ticp,
|
|
bool permanent)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
struct xlog_ticket *tic;
|
|
int need_bytes;
|
|
int error = 0;
|
|
|
|
if (xlog_is_shutdown(log))
|
|
return -EIO;
|
|
|
|
XFS_STATS_INC(mp, xs_try_logspace);
|
|
|
|
ASSERT(*ticp == NULL);
|
|
tic = xlog_ticket_alloc(log, unit_bytes, cnt, permanent);
|
|
*ticp = tic;
|
|
|
|
xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt
|
|
: tic->t_unit_res);
|
|
|
|
trace_xfs_log_reserve(log, tic);
|
|
|
|
error = xlog_grant_head_check(log, &log->l_reserve_head, tic,
|
|
&need_bytes);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes);
|
|
xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
|
|
trace_xfs_log_reserve_exit(log, tic);
|
|
xlog_verify_grant_tail(log);
|
|
return 0;
|
|
|
|
out_error:
|
|
/*
|
|
* If we are failing, make sure the ticket doesn't have any current
|
|
* reservations. We don't want to add this back when the ticket/
|
|
* transaction gets cancelled.
|
|
*/
|
|
tic->t_curr_res = 0;
|
|
tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Run all the pending iclog callbacks and wake log force waiters and iclog
|
|
* space waiters so they can process the newly set shutdown state. We really
|
|
* don't care what order we process callbacks here because the log is shut down
|
|
* and so state cannot change on disk anymore. However, we cannot wake waiters
|
|
* until the callbacks have been processed because we may be in unmount and
|
|
* we must ensure that all AIL operations the callbacks perform have completed
|
|
* before we tear down the AIL.
|
|
*
|
|
* We avoid processing actively referenced iclogs so that we don't run callbacks
|
|
* while the iclog owner might still be preparing the iclog for IO submssion.
|
|
* These will be caught by xlog_state_iclog_release() and call this function
|
|
* again to process any callbacks that may have been added to that iclog.
|
|
*/
|
|
static void
|
|
xlog_state_shutdown_callbacks(
|
|
struct xlog *log)
|
|
{
|
|
struct xlog_in_core *iclog;
|
|
LIST_HEAD(cb_list);
|
|
|
|
iclog = log->l_iclog;
|
|
do {
|
|
if (atomic_read(&iclog->ic_refcnt)) {
|
|
/* Reference holder will re-run iclog callbacks. */
|
|
continue;
|
|
}
|
|
list_splice_init(&iclog->ic_callbacks, &cb_list);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
xlog_cil_process_committed(&cb_list);
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
wake_up_all(&iclog->ic_write_wait);
|
|
wake_up_all(&iclog->ic_force_wait);
|
|
} while ((iclog = iclog->ic_next) != log->l_iclog);
|
|
|
|
wake_up_all(&log->l_flush_wait);
|
|
}
|
|
|
|
/*
|
|
* Flush iclog to disk if this is the last reference to the given iclog and the
|
|
* it is in the WANT_SYNC state.
|
|
*
|
|
* If XLOG_ICL_NEED_FUA is already set on the iclog, we need to ensure that the
|
|
* log tail is updated correctly. NEED_FUA indicates that the iclog will be
|
|
* written to stable storage, and implies that a commit record is contained
|
|
* within the iclog. We need to ensure that the log tail does not move beyond
|
|
* the tail that the first commit record in the iclog ordered against, otherwise
|
|
* correct recovery of that checkpoint becomes dependent on future operations
|
|
* performed on this iclog.
|
|
*
|
|
* Hence if NEED_FUA is set and the current iclog tail lsn is empty, write the
|
|
* current tail into iclog. Once the iclog tail is set, future operations must
|
|
* not modify it, otherwise they potentially violate ordering constraints for
|
|
* the checkpoint commit that wrote the initial tail lsn value. The tail lsn in
|
|
* the iclog will get zeroed on activation of the iclog after sync, so we
|
|
* always capture the tail lsn on the iclog on the first NEED_FUA release
|
|
* regardless of the number of active reference counts on this iclog.
|
|
*/
|
|
int
|
|
xlog_state_release_iclog(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
xfs_lsn_t tail_lsn;
|
|
bool last_ref;
|
|
|
|
lockdep_assert_held(&log->l_icloglock);
|
|
|
|
trace_xlog_iclog_release(iclog, _RET_IP_);
|
|
/*
|
|
* Grabbing the current log tail needs to be atomic w.r.t. the writing
|
|
* of the tail LSN into the iclog so we guarantee that the log tail does
|
|
* not move between the first time we know that the iclog needs to be
|
|
* made stable and when we eventually submit it.
|
|
*/
|
|
if ((iclog->ic_state == XLOG_STATE_WANT_SYNC ||
|
|
(iclog->ic_flags & XLOG_ICL_NEED_FUA)) &&
|
|
!iclog->ic_header.h_tail_lsn) {
|
|
tail_lsn = xlog_assign_tail_lsn(log->l_mp);
|
|
iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
|
|
}
|
|
|
|
last_ref = atomic_dec_and_test(&iclog->ic_refcnt);
|
|
|
|
if (xlog_is_shutdown(log)) {
|
|
/*
|
|
* If there are no more references to this iclog, process the
|
|
* pending iclog callbacks that were waiting on the release of
|
|
* this iclog.
|
|
*/
|
|
if (last_ref)
|
|
xlog_state_shutdown_callbacks(log);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!last_ref)
|
|
return 0;
|
|
|
|
if (iclog->ic_state != XLOG_STATE_WANT_SYNC) {
|
|
ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
|
|
return 0;
|
|
}
|
|
|
|
iclog->ic_state = XLOG_STATE_SYNCING;
|
|
xlog_verify_tail_lsn(log, iclog);
|
|
trace_xlog_iclog_syncing(iclog, _RET_IP_);
|
|
|
|
spin_unlock(&log->l_icloglock);
|
|
xlog_sync(log, iclog, ticket);
|
|
spin_lock(&log->l_icloglock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Mount a log filesystem
|
|
*
|
|
* mp - ubiquitous xfs mount point structure
|
|
* log_target - buftarg of on-disk log device
|
|
* blk_offset - Start block # where block size is 512 bytes (BBSIZE)
|
|
* num_bblocks - Number of BBSIZE blocks in on-disk log
|
|
*
|
|
* Return error or zero.
|
|
*/
|
|
int
|
|
xfs_log_mount(
|
|
xfs_mount_t *mp,
|
|
xfs_buftarg_t *log_target,
|
|
xfs_daddr_t blk_offset,
|
|
int num_bblks)
|
|
{
|
|
struct xlog *log;
|
|
bool fatal = xfs_has_crc(mp);
|
|
int error = 0;
|
|
int min_logfsbs;
|
|
|
|
if (!xfs_has_norecovery(mp)) {
|
|
xfs_notice(mp, "Mounting V%d Filesystem %pU",
|
|
XFS_SB_VERSION_NUM(&mp->m_sb),
|
|
&mp->m_sb.sb_uuid);
|
|
} else {
|
|
xfs_notice(mp,
|
|
"Mounting V%d filesystem %pU in no-recovery mode. Filesystem will be inconsistent.",
|
|
XFS_SB_VERSION_NUM(&mp->m_sb),
|
|
&mp->m_sb.sb_uuid);
|
|
ASSERT(xfs_is_readonly(mp));
|
|
}
|
|
|
|
log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
|
|
if (IS_ERR(log)) {
|
|
error = PTR_ERR(log);
|
|
goto out;
|
|
}
|
|
mp->m_log = log;
|
|
|
|
/*
|
|
* Validate the given log space and drop a critical message via syslog
|
|
* if the log size is too small that would lead to some unexpected
|
|
* situations in transaction log space reservation stage.
|
|
*
|
|
* Note: we can't just reject the mount if the validation fails. This
|
|
* would mean that people would have to downgrade their kernel just to
|
|
* remedy the situation as there is no way to grow the log (short of
|
|
* black magic surgery with xfs_db).
|
|
*
|
|
* We can, however, reject mounts for CRC format filesystems, as the
|
|
* mkfs binary being used to make the filesystem should never create a
|
|
* filesystem with a log that is too small.
|
|
*/
|
|
min_logfsbs = xfs_log_calc_minimum_size(mp);
|
|
|
|
if (mp->m_sb.sb_logblocks < min_logfsbs) {
|
|
xfs_warn(mp,
|
|
"Log size %d blocks too small, minimum size is %d blocks",
|
|
mp->m_sb.sb_logblocks, min_logfsbs);
|
|
error = -EINVAL;
|
|
} else if (mp->m_sb.sb_logblocks > XFS_MAX_LOG_BLOCKS) {
|
|
xfs_warn(mp,
|
|
"Log size %d blocks too large, maximum size is %lld blocks",
|
|
mp->m_sb.sb_logblocks, XFS_MAX_LOG_BLOCKS);
|
|
error = -EINVAL;
|
|
} else if (XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks) > XFS_MAX_LOG_BYTES) {
|
|
xfs_warn(mp,
|
|
"log size %lld bytes too large, maximum size is %lld bytes",
|
|
XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks),
|
|
XFS_MAX_LOG_BYTES);
|
|
error = -EINVAL;
|
|
} else if (mp->m_sb.sb_logsunit > 1 &&
|
|
mp->m_sb.sb_logsunit % mp->m_sb.sb_blocksize) {
|
|
xfs_warn(mp,
|
|
"log stripe unit %u bytes must be a multiple of block size",
|
|
mp->m_sb.sb_logsunit);
|
|
error = -EINVAL;
|
|
fatal = true;
|
|
}
|
|
if (error) {
|
|
/*
|
|
* Log check errors are always fatal on v5; or whenever bad
|
|
* metadata leads to a crash.
|
|
*/
|
|
if (fatal) {
|
|
xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!");
|
|
ASSERT(0);
|
|
goto out_free_log;
|
|
}
|
|
xfs_crit(mp, "Log size out of supported range.");
|
|
xfs_crit(mp,
|
|
"Continuing onwards, but if log hangs are experienced then please report this message in the bug report.");
|
|
}
|
|
|
|
/*
|
|
* Initialize the AIL now we have a log.
|
|
*/
|
|
error = xfs_trans_ail_init(mp);
|
|
if (error) {
|
|
xfs_warn(mp, "AIL initialisation failed: error %d", error);
|
|
goto out_free_log;
|
|
}
|
|
log->l_ailp = mp->m_ail;
|
|
|
|
/*
|
|
* skip log recovery on a norecovery mount. pretend it all
|
|
* just worked.
|
|
*/
|
|
if (!xfs_has_norecovery(mp)) {
|
|
/*
|
|
* log recovery ignores readonly state and so we need to clear
|
|
* mount-based read only state so it can write to disk.
|
|
*/
|
|
bool readonly = test_and_clear_bit(XFS_OPSTATE_READONLY,
|
|
&mp->m_opstate);
|
|
error = xlog_recover(log);
|
|
if (readonly)
|
|
set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
|
|
if (error) {
|
|
xfs_warn(mp, "log mount/recovery failed: error %d",
|
|
error);
|
|
xlog_recover_cancel(log);
|
|
goto out_destroy_ail;
|
|
}
|
|
}
|
|
|
|
error = xfs_sysfs_init(&log->l_kobj, &xfs_log_ktype, &mp->m_kobj,
|
|
"log");
|
|
if (error)
|
|
goto out_destroy_ail;
|
|
|
|
/* Normal transactions can now occur */
|
|
clear_bit(XLOG_ACTIVE_RECOVERY, &log->l_opstate);
|
|
|
|
/*
|
|
* Now the log has been fully initialised and we know were our
|
|
* space grant counters are, we can initialise the permanent ticket
|
|
* needed for delayed logging to work.
|
|
*/
|
|
xlog_cil_init_post_recovery(log);
|
|
|
|
return 0;
|
|
|
|
out_destroy_ail:
|
|
xfs_trans_ail_destroy(mp);
|
|
out_free_log:
|
|
xlog_dealloc_log(log);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Finish the recovery of the file system. This is separate from the
|
|
* xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read
|
|
* in the root and real-time bitmap inodes between calling xfs_log_mount() and
|
|
* here.
|
|
*
|
|
* If we finish recovery successfully, start the background log work. If we are
|
|
* not doing recovery, then we have a RO filesystem and we don't need to start
|
|
* it.
|
|
*/
|
|
int
|
|
xfs_log_mount_finish(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
bool readonly;
|
|
int error = 0;
|
|
|
|
if (xfs_has_norecovery(mp)) {
|
|
ASSERT(xfs_is_readonly(mp));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* log recovery ignores readonly state and so we need to clear
|
|
* mount-based read only state so it can write to disk.
|
|
*/
|
|
readonly = test_and_clear_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
|
|
|
|
/*
|
|
* During the second phase of log recovery, we need iget and
|
|
* iput to behave like they do for an active filesystem.
|
|
* xfs_fs_drop_inode needs to be able to prevent the deletion
|
|
* of inodes before we're done replaying log items on those
|
|
* inodes. Turn it off immediately after recovery finishes
|
|
* so that we don't leak the quota inodes if subsequent mount
|
|
* activities fail.
|
|
*
|
|
* We let all inodes involved in redo item processing end up on
|
|
* the LRU instead of being evicted immediately so that if we do
|
|
* something to an unlinked inode, the irele won't cause
|
|
* premature truncation and freeing of the inode, which results
|
|
* in log recovery failure. We have to evict the unreferenced
|
|
* lru inodes after clearing SB_ACTIVE because we don't
|
|
* otherwise clean up the lru if there's a subsequent failure in
|
|
* xfs_mountfs, which leads to us leaking the inodes if nothing
|
|
* else (e.g. quotacheck) references the inodes before the
|
|
* mount failure occurs.
|
|
*/
|
|
mp->m_super->s_flags |= SB_ACTIVE;
|
|
xfs_log_work_queue(mp);
|
|
if (xlog_recovery_needed(log))
|
|
error = xlog_recover_finish(log);
|
|
mp->m_super->s_flags &= ~SB_ACTIVE;
|
|
evict_inodes(mp->m_super);
|
|
|
|
/*
|
|
* Drain the buffer LRU after log recovery. This is required for v4
|
|
* filesystems to avoid leaving around buffers with NULL verifier ops,
|
|
* but we do it unconditionally to make sure we're always in a clean
|
|
* cache state after mount.
|
|
*
|
|
* Don't push in the error case because the AIL may have pending intents
|
|
* that aren't removed until recovery is cancelled.
|
|
*/
|
|
if (xlog_recovery_needed(log)) {
|
|
if (!error) {
|
|
xfs_log_force(mp, XFS_LOG_SYNC);
|
|
xfs_ail_push_all_sync(mp->m_ail);
|
|
}
|
|
xfs_notice(mp, "Ending recovery (logdev: %s)",
|
|
mp->m_logname ? mp->m_logname : "internal");
|
|
} else {
|
|
xfs_info(mp, "Ending clean mount");
|
|
}
|
|
xfs_buftarg_drain(mp->m_ddev_targp);
|
|
|
|
clear_bit(XLOG_RECOVERY_NEEDED, &log->l_opstate);
|
|
if (readonly)
|
|
set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
|
|
|
|
/* Make sure the log is dead if we're returning failure. */
|
|
ASSERT(!error || xlog_is_shutdown(log));
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* The mount has failed. Cancel the recovery if it hasn't completed and destroy
|
|
* the log.
|
|
*/
|
|
void
|
|
xfs_log_mount_cancel(
|
|
struct xfs_mount *mp)
|
|
{
|
|
xlog_recover_cancel(mp->m_log);
|
|
xfs_log_unmount(mp);
|
|
}
|
|
|
|
/*
|
|
* Flush out the iclog to disk ensuring that device caches are flushed and
|
|
* the iclog hits stable storage before any completion waiters are woken.
|
|
*/
|
|
static inline int
|
|
xlog_force_iclog(
|
|
struct xlog_in_core *iclog)
|
|
{
|
|
atomic_inc(&iclog->ic_refcnt);
|
|
iclog->ic_flags |= XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA;
|
|
if (iclog->ic_state == XLOG_STATE_ACTIVE)
|
|
xlog_state_switch_iclogs(iclog->ic_log, iclog, 0);
|
|
return xlog_state_release_iclog(iclog->ic_log, iclog, NULL);
|
|
}
|
|
|
|
/*
|
|
* Cycle all the iclogbuf locks to make sure all log IO completion
|
|
* is done before we tear down these buffers.
|
|
*/
|
|
static void
|
|
xlog_wait_iclog_completion(struct xlog *log)
|
|
{
|
|
int i;
|
|
struct xlog_in_core *iclog = log->l_iclog;
|
|
|
|
for (i = 0; i < log->l_iclog_bufs; i++) {
|
|
down(&iclog->ic_sema);
|
|
up(&iclog->ic_sema);
|
|
iclog = iclog->ic_next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for the iclog and all prior iclogs to be written disk as required by the
|
|
* log force state machine. Waiting on ic_force_wait ensures iclog completions
|
|
* have been ordered and callbacks run before we are woken here, hence
|
|
* guaranteeing that all the iclogs up to this one are on stable storage.
|
|
*/
|
|
int
|
|
xlog_wait_on_iclog(
|
|
struct xlog_in_core *iclog)
|
|
__releases(iclog->ic_log->l_icloglock)
|
|
{
|
|
struct xlog *log = iclog->ic_log;
|
|
|
|
trace_xlog_iclog_wait_on(iclog, _RET_IP_);
|
|
if (!xlog_is_shutdown(log) &&
|
|
iclog->ic_state != XLOG_STATE_ACTIVE &&
|
|
iclog->ic_state != XLOG_STATE_DIRTY) {
|
|
XFS_STATS_INC(log->l_mp, xs_log_force_sleep);
|
|
xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
|
|
} else {
|
|
spin_unlock(&log->l_icloglock);
|
|
}
|
|
|
|
if (xlog_is_shutdown(log))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write out an unmount record using the ticket provided. We have to account for
|
|
* the data space used in the unmount ticket as this write is not done from a
|
|
* transaction context that has already done the accounting for us.
|
|
*/
|
|
static int
|
|
xlog_write_unmount_record(
|
|
struct xlog *log,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
struct {
|
|
struct xlog_op_header ophdr;
|
|
struct xfs_unmount_log_format ulf;
|
|
} unmount_rec = {
|
|
.ophdr = {
|
|
.oh_clientid = XFS_LOG,
|
|
.oh_tid = cpu_to_be32(ticket->t_tid),
|
|
.oh_flags = XLOG_UNMOUNT_TRANS,
|
|
},
|
|
.ulf = {
|
|
.magic = XLOG_UNMOUNT_TYPE,
|
|
},
|
|
};
|
|
struct xfs_log_iovec reg = {
|
|
.i_addr = &unmount_rec,
|
|
.i_len = sizeof(unmount_rec),
|
|
.i_type = XLOG_REG_TYPE_UNMOUNT,
|
|
};
|
|
struct xfs_log_vec vec = {
|
|
.lv_niovecs = 1,
|
|
.lv_iovecp = ®,
|
|
};
|
|
LIST_HEAD(lv_chain);
|
|
list_add(&vec.lv_list, &lv_chain);
|
|
|
|
BUILD_BUG_ON((sizeof(struct xlog_op_header) +
|
|
sizeof(struct xfs_unmount_log_format)) !=
|
|
sizeof(unmount_rec));
|
|
|
|
/* account for space used by record data */
|
|
ticket->t_curr_res -= sizeof(unmount_rec);
|
|
|
|
return xlog_write(log, NULL, &lv_chain, ticket, reg.i_len);
|
|
}
|
|
|
|
/*
|
|
* Mark the filesystem clean by writing an unmount record to the head of the
|
|
* log.
|
|
*/
|
|
static void
|
|
xlog_unmount_write(
|
|
struct xlog *log)
|
|
{
|
|
struct xfs_mount *mp = log->l_mp;
|
|
struct xlog_in_core *iclog;
|
|
struct xlog_ticket *tic = NULL;
|
|
int error;
|
|
|
|
error = xfs_log_reserve(mp, 600, 1, &tic, 0);
|
|
if (error)
|
|
goto out_err;
|
|
|
|
error = xlog_write_unmount_record(log, tic);
|
|
/*
|
|
* At this point, we're umounting anyway, so there's no point in
|
|
* transitioning log state to shutdown. Just continue...
|
|
*/
|
|
out_err:
|
|
if (error)
|
|
xfs_alert(mp, "%s: unmount record failed", __func__);
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
iclog = log->l_iclog;
|
|
error = xlog_force_iclog(iclog);
|
|
xlog_wait_on_iclog(iclog);
|
|
|
|
if (tic) {
|
|
trace_xfs_log_umount_write(log, tic);
|
|
xfs_log_ticket_ungrant(log, tic);
|
|
}
|
|
}
|
|
|
|
static void
|
|
xfs_log_unmount_verify_iclog(
|
|
struct xlog *log)
|
|
{
|
|
struct xlog_in_core *iclog = log->l_iclog;
|
|
|
|
do {
|
|
ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
|
|
ASSERT(iclog->ic_offset == 0);
|
|
} while ((iclog = iclog->ic_next) != log->l_iclog);
|
|
}
|
|
|
|
/*
|
|
* Unmount record used to have a string "Unmount filesystem--" in the
|
|
* data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
|
|
* We just write the magic number now since that particular field isn't
|
|
* currently architecture converted and "Unmount" is a bit foo.
|
|
* As far as I know, there weren't any dependencies on the old behaviour.
|
|
*/
|
|
static void
|
|
xfs_log_unmount_write(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
|
|
if (!xfs_log_writable(mp))
|
|
return;
|
|
|
|
xfs_log_force(mp, XFS_LOG_SYNC);
|
|
|
|
if (xlog_is_shutdown(log))
|
|
return;
|
|
|
|
/*
|
|
* If we think the summary counters are bad, avoid writing the unmount
|
|
* record to force log recovery at next mount, after which the summary
|
|
* counters will be recalculated. Refer to xlog_check_unmount_rec for
|
|
* more details.
|
|
*/
|
|
if (XFS_TEST_ERROR(xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS), mp,
|
|
XFS_ERRTAG_FORCE_SUMMARY_RECALC)) {
|
|
xfs_alert(mp, "%s: will fix summary counters at next mount",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
xfs_log_unmount_verify_iclog(log);
|
|
xlog_unmount_write(log);
|
|
}
|
|
|
|
/*
|
|
* Empty the log for unmount/freeze.
|
|
*
|
|
* To do this, we first need to shut down the background log work so it is not
|
|
* trying to cover the log as we clean up. We then need to unpin all objects in
|
|
* the log so we can then flush them out. Once they have completed their IO and
|
|
* run the callbacks removing themselves from the AIL, we can cover the log.
|
|
*/
|
|
int
|
|
xfs_log_quiesce(
|
|
struct xfs_mount *mp)
|
|
{
|
|
/*
|
|
* Clear log incompat features since we're quiescing the log. Report
|
|
* failures, though it's not fatal to have a higher log feature
|
|
* protection level than the log contents actually require.
|
|
*/
|
|
if (xfs_clear_incompat_log_features(mp)) {
|
|
int error;
|
|
|
|
error = xfs_sync_sb(mp, false);
|
|
if (error)
|
|
xfs_warn(mp,
|
|
"Failed to clear log incompat features on quiesce");
|
|
}
|
|
|
|
cancel_delayed_work_sync(&mp->m_log->l_work);
|
|
xfs_log_force(mp, XFS_LOG_SYNC);
|
|
|
|
/*
|
|
* The superblock buffer is uncached and while xfs_ail_push_all_sync()
|
|
* will push it, xfs_buftarg_wait() will not wait for it. Further,
|
|
* xfs_buf_iowait() cannot be used because it was pushed with the
|
|
* XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for
|
|
* the IO to complete.
|
|
*/
|
|
xfs_ail_push_all_sync(mp->m_ail);
|
|
xfs_buftarg_wait(mp->m_ddev_targp);
|
|
xfs_buf_lock(mp->m_sb_bp);
|
|
xfs_buf_unlock(mp->m_sb_bp);
|
|
|
|
return xfs_log_cover(mp);
|
|
}
|
|
|
|
void
|
|
xfs_log_clean(
|
|
struct xfs_mount *mp)
|
|
{
|
|
xfs_log_quiesce(mp);
|
|
xfs_log_unmount_write(mp);
|
|
}
|
|
|
|
/*
|
|
* Shut down and release the AIL and Log.
|
|
*
|
|
* During unmount, we need to ensure we flush all the dirty metadata objects
|
|
* from the AIL so that the log is empty before we write the unmount record to
|
|
* the log. Once this is done, we can tear down the AIL and the log.
|
|
*/
|
|
void
|
|
xfs_log_unmount(
|
|
struct xfs_mount *mp)
|
|
{
|
|
xfs_log_clean(mp);
|
|
|
|
/*
|
|
* If shutdown has come from iclog IO context, the log
|
|
* cleaning will have been skipped and so we need to wait
|
|
* for the iclog to complete shutdown processing before we
|
|
* tear anything down.
|
|
*/
|
|
xlog_wait_iclog_completion(mp->m_log);
|
|
|
|
xfs_buftarg_drain(mp->m_ddev_targp);
|
|
|
|
xfs_trans_ail_destroy(mp);
|
|
|
|
xfs_sysfs_del(&mp->m_log->l_kobj);
|
|
|
|
xlog_dealloc_log(mp->m_log);
|
|
}
|
|
|
|
void
|
|
xfs_log_item_init(
|
|
struct xfs_mount *mp,
|
|
struct xfs_log_item *item,
|
|
int type,
|
|
const struct xfs_item_ops *ops)
|
|
{
|
|
item->li_log = mp->m_log;
|
|
item->li_ailp = mp->m_ail;
|
|
item->li_type = type;
|
|
item->li_ops = ops;
|
|
item->li_lv = NULL;
|
|
|
|
INIT_LIST_HEAD(&item->li_ail);
|
|
INIT_LIST_HEAD(&item->li_cil);
|
|
INIT_LIST_HEAD(&item->li_bio_list);
|
|
INIT_LIST_HEAD(&item->li_trans);
|
|
}
|
|
|
|
/*
|
|
* Wake up processes waiting for log space after we have moved the log tail.
|
|
*/
|
|
void
|
|
xfs_log_space_wake(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
int free_bytes;
|
|
|
|
if (xlog_is_shutdown(log))
|
|
return;
|
|
|
|
if (!list_empty_careful(&log->l_write_head.waiters)) {
|
|
ASSERT(!xlog_in_recovery(log));
|
|
|
|
spin_lock(&log->l_write_head.lock);
|
|
free_bytes = xlog_space_left(log, &log->l_write_head.grant);
|
|
xlog_grant_head_wake(log, &log->l_write_head, &free_bytes);
|
|
spin_unlock(&log->l_write_head.lock);
|
|
}
|
|
|
|
if (!list_empty_careful(&log->l_reserve_head.waiters)) {
|
|
ASSERT(!xlog_in_recovery(log));
|
|
|
|
spin_lock(&log->l_reserve_head.lock);
|
|
free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
|
|
xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes);
|
|
spin_unlock(&log->l_reserve_head.lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine if we have a transaction that has gone to disk that needs to be
|
|
* covered. To begin the transition to the idle state firstly the log needs to
|
|
* be idle. That means the CIL, the AIL and the iclogs needs to be empty before
|
|
* we start attempting to cover the log.
|
|
*
|
|
* Only if we are then in a state where covering is needed, the caller is
|
|
* informed that dummy transactions are required to move the log into the idle
|
|
* state.
|
|
*
|
|
* If there are any items in the AIl or CIL, then we do not want to attempt to
|
|
* cover the log as we may be in a situation where there isn't log space
|
|
* available to run a dummy transaction and this can lead to deadlocks when the
|
|
* tail of the log is pinned by an item that is modified in the CIL. Hence
|
|
* there's no point in running a dummy transaction at this point because we
|
|
* can't start trying to idle the log until both the CIL and AIL are empty.
|
|
*/
|
|
static bool
|
|
xfs_log_need_covered(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
bool needed = false;
|
|
|
|
if (!xlog_cil_empty(log))
|
|
return false;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
switch (log->l_covered_state) {
|
|
case XLOG_STATE_COVER_DONE:
|
|
case XLOG_STATE_COVER_DONE2:
|
|
case XLOG_STATE_COVER_IDLE:
|
|
break;
|
|
case XLOG_STATE_COVER_NEED:
|
|
case XLOG_STATE_COVER_NEED2:
|
|
if (xfs_ail_min_lsn(log->l_ailp))
|
|
break;
|
|
if (!xlog_iclogs_empty(log))
|
|
break;
|
|
|
|
needed = true;
|
|
if (log->l_covered_state == XLOG_STATE_COVER_NEED)
|
|
log->l_covered_state = XLOG_STATE_COVER_DONE;
|
|
else
|
|
log->l_covered_state = XLOG_STATE_COVER_DONE2;
|
|
break;
|
|
default:
|
|
needed = true;
|
|
break;
|
|
}
|
|
spin_unlock(&log->l_icloglock);
|
|
return needed;
|
|
}
|
|
|
|
/*
|
|
* Explicitly cover the log. This is similar to background log covering but
|
|
* intended for usage in quiesce codepaths. The caller is responsible to ensure
|
|
* the log is idle and suitable for covering. The CIL, iclog buffers and AIL
|
|
* must all be empty.
|
|
*/
|
|
static int
|
|
xfs_log_cover(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int error = 0;
|
|
bool need_covered;
|
|
|
|
ASSERT((xlog_cil_empty(mp->m_log) && xlog_iclogs_empty(mp->m_log) &&
|
|
!xfs_ail_min_lsn(mp->m_log->l_ailp)) ||
|
|
xlog_is_shutdown(mp->m_log));
|
|
|
|
if (!xfs_log_writable(mp))
|
|
return 0;
|
|
|
|
/*
|
|
* xfs_log_need_covered() is not idempotent because it progresses the
|
|
* state machine if the log requires covering. Therefore, we must call
|
|
* this function once and use the result until we've issued an sb sync.
|
|
* Do so first to make that abundantly clear.
|
|
*
|
|
* Fall into the covering sequence if the log needs covering or the
|
|
* mount has lazy superblock accounting to sync to disk. The sb sync
|
|
* used for covering accumulates the in-core counters, so covering
|
|
* handles this for us.
|
|
*/
|
|
need_covered = xfs_log_need_covered(mp);
|
|
if (!need_covered && !xfs_has_lazysbcount(mp))
|
|
return 0;
|
|
|
|
/*
|
|
* To cover the log, commit the superblock twice (at most) in
|
|
* independent checkpoints. The first serves as a reference for the
|
|
* tail pointer. The sync transaction and AIL push empties the AIL and
|
|
* updates the in-core tail to the LSN of the first checkpoint. The
|
|
* second commit updates the on-disk tail with the in-core LSN,
|
|
* covering the log. Push the AIL one more time to leave it empty, as
|
|
* we found it.
|
|
*/
|
|
do {
|
|
error = xfs_sync_sb(mp, true);
|
|
if (error)
|
|
break;
|
|
xfs_ail_push_all_sync(mp->m_ail);
|
|
} while (xfs_log_need_covered(mp));
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* We may be holding the log iclog lock upon entering this routine.
|
|
*/
|
|
xfs_lsn_t
|
|
xlog_assign_tail_lsn_locked(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
struct xfs_log_item *lip;
|
|
xfs_lsn_t tail_lsn;
|
|
|
|
assert_spin_locked(&mp->m_ail->ail_lock);
|
|
|
|
/*
|
|
* To make sure we always have a valid LSN for the log tail we keep
|
|
* track of the last LSN which was committed in log->l_last_sync_lsn,
|
|
* and use that when the AIL was empty.
|
|
*/
|
|
lip = xfs_ail_min(mp->m_ail);
|
|
if (lip)
|
|
tail_lsn = lip->li_lsn;
|
|
else
|
|
tail_lsn = atomic64_read(&log->l_last_sync_lsn);
|
|
trace_xfs_log_assign_tail_lsn(log, tail_lsn);
|
|
atomic64_set(&log->l_tail_lsn, tail_lsn);
|
|
return tail_lsn;
|
|
}
|
|
|
|
xfs_lsn_t
|
|
xlog_assign_tail_lsn(
|
|
struct xfs_mount *mp)
|
|
{
|
|
xfs_lsn_t tail_lsn;
|
|
|
|
spin_lock(&mp->m_ail->ail_lock);
|
|
tail_lsn = xlog_assign_tail_lsn_locked(mp);
|
|
spin_unlock(&mp->m_ail->ail_lock);
|
|
|
|
return tail_lsn;
|
|
}
|
|
|
|
/*
|
|
* Return the space in the log between the tail and the head. The head
|
|
* is passed in the cycle/bytes formal parms. In the special case where
|
|
* the reserve head has wrapped passed the tail, this calculation is no
|
|
* longer valid. In this case, just return 0 which means there is no space
|
|
* in the log. This works for all places where this function is called
|
|
* with the reserve head. Of course, if the write head were to ever
|
|
* wrap the tail, we should blow up. Rather than catch this case here,
|
|
* we depend on other ASSERTions in other parts of the code. XXXmiken
|
|
*
|
|
* If reservation head is behind the tail, we have a problem. Warn about it,
|
|
* but then treat it as if the log is empty.
|
|
*
|
|
* If the log is shut down, the head and tail may be invalid or out of whack, so
|
|
* shortcut invalidity asserts in this case so that we don't trigger them
|
|
* falsely.
|
|
*/
|
|
STATIC int
|
|
xlog_space_left(
|
|
struct xlog *log,
|
|
atomic64_t *head)
|
|
{
|
|
int tail_bytes;
|
|
int tail_cycle;
|
|
int head_cycle;
|
|
int head_bytes;
|
|
|
|
xlog_crack_grant_head(head, &head_cycle, &head_bytes);
|
|
xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes);
|
|
tail_bytes = BBTOB(tail_bytes);
|
|
if (tail_cycle == head_cycle && head_bytes >= tail_bytes)
|
|
return log->l_logsize - (head_bytes - tail_bytes);
|
|
if (tail_cycle + 1 < head_cycle)
|
|
return 0;
|
|
|
|
/* Ignore potential inconsistency when shutdown. */
|
|
if (xlog_is_shutdown(log))
|
|
return log->l_logsize;
|
|
|
|
if (tail_cycle < head_cycle) {
|
|
ASSERT(tail_cycle == (head_cycle - 1));
|
|
return tail_bytes - head_bytes;
|
|
}
|
|
|
|
/*
|
|
* The reservation head is behind the tail. In this case we just want to
|
|
* return the size of the log as the amount of space left.
|
|
*/
|
|
xfs_alert(log->l_mp, "xlog_space_left: head behind tail");
|
|
xfs_alert(log->l_mp, " tail_cycle = %d, tail_bytes = %d",
|
|
tail_cycle, tail_bytes);
|
|
xfs_alert(log->l_mp, " GH cycle = %d, GH bytes = %d",
|
|
head_cycle, head_bytes);
|
|
ASSERT(0);
|
|
return log->l_logsize;
|
|
}
|
|
|
|
|
|
static void
|
|
xlog_ioend_work(
|
|
struct work_struct *work)
|
|
{
|
|
struct xlog_in_core *iclog =
|
|
container_of(work, struct xlog_in_core, ic_end_io_work);
|
|
struct xlog *log = iclog->ic_log;
|
|
int error;
|
|
|
|
error = blk_status_to_errno(iclog->ic_bio.bi_status);
|
|
#ifdef DEBUG
|
|
/* treat writes with injected CRC errors as failed */
|
|
if (iclog->ic_fail_crc)
|
|
error = -EIO;
|
|
#endif
|
|
|
|
/*
|
|
* Race to shutdown the filesystem if we see an error.
|
|
*/
|
|
if (XFS_TEST_ERROR(error, log->l_mp, XFS_ERRTAG_IODONE_IOERR)) {
|
|
xfs_alert(log->l_mp, "log I/O error %d", error);
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
}
|
|
|
|
xlog_state_done_syncing(iclog);
|
|
bio_uninit(&iclog->ic_bio);
|
|
|
|
/*
|
|
* Drop the lock to signal that we are done. Nothing references the
|
|
* iclog after this, so an unmount waiting on this lock can now tear it
|
|
* down safely. As such, it is unsafe to reference the iclog after the
|
|
* unlock as we could race with it being freed.
|
|
*/
|
|
up(&iclog->ic_sema);
|
|
}
|
|
|
|
/*
|
|
* Return size of each in-core log record buffer.
|
|
*
|
|
* All machines get 8 x 32kB buffers by default, unless tuned otherwise.
|
|
*
|
|
* If the filesystem blocksize is too large, we may need to choose a
|
|
* larger size since the directory code currently logs entire blocks.
|
|
*/
|
|
STATIC void
|
|
xlog_get_iclog_buffer_size(
|
|
struct xfs_mount *mp,
|
|
struct xlog *log)
|
|
{
|
|
if (mp->m_logbufs <= 0)
|
|
mp->m_logbufs = XLOG_MAX_ICLOGS;
|
|
if (mp->m_logbsize <= 0)
|
|
mp->m_logbsize = XLOG_BIG_RECORD_BSIZE;
|
|
|
|
log->l_iclog_bufs = mp->m_logbufs;
|
|
log->l_iclog_size = mp->m_logbsize;
|
|
|
|
/*
|
|
* # headers = size / 32k - one header holds cycles from 32k of data.
|
|
*/
|
|
log->l_iclog_heads =
|
|
DIV_ROUND_UP(mp->m_logbsize, XLOG_HEADER_CYCLE_SIZE);
|
|
log->l_iclog_hsize = log->l_iclog_heads << BBSHIFT;
|
|
}
|
|
|
|
void
|
|
xfs_log_work_queue(
|
|
struct xfs_mount *mp)
|
|
{
|
|
queue_delayed_work(mp->m_sync_workqueue, &mp->m_log->l_work,
|
|
msecs_to_jiffies(xfs_syncd_centisecs * 10));
|
|
}
|
|
|
|
/*
|
|
* Clear the log incompat flags if we have the opportunity.
|
|
*
|
|
* This only happens if we're about to log the second dummy transaction as part
|
|
* of covering the log and we can get the log incompat feature usage lock.
|
|
*/
|
|
static inline void
|
|
xlog_clear_incompat(
|
|
struct xlog *log)
|
|
{
|
|
struct xfs_mount *mp = log->l_mp;
|
|
|
|
if (!xfs_sb_has_incompat_log_feature(&mp->m_sb,
|
|
XFS_SB_FEAT_INCOMPAT_LOG_ALL))
|
|
return;
|
|
|
|
if (log->l_covered_state != XLOG_STATE_COVER_DONE2)
|
|
return;
|
|
|
|
if (!down_write_trylock(&log->l_incompat_users))
|
|
return;
|
|
|
|
xfs_clear_incompat_log_features(mp);
|
|
up_write(&log->l_incompat_users);
|
|
}
|
|
|
|
/*
|
|
* Every sync period we need to unpin all items in the AIL and push them to
|
|
* disk. If there is nothing dirty, then we might need to cover the log to
|
|
* indicate that the filesystem is idle.
|
|
*/
|
|
static void
|
|
xfs_log_worker(
|
|
struct work_struct *work)
|
|
{
|
|
struct xlog *log = container_of(to_delayed_work(work),
|
|
struct xlog, l_work);
|
|
struct xfs_mount *mp = log->l_mp;
|
|
|
|
/* dgc: errors ignored - not fatal and nowhere to report them */
|
|
if (xfs_fs_writable(mp, SB_FREEZE_WRITE) && xfs_log_need_covered(mp)) {
|
|
/*
|
|
* Dump a transaction into the log that contains no real change.
|
|
* This is needed to stamp the current tail LSN into the log
|
|
* during the covering operation.
|
|
*
|
|
* We cannot use an inode here for this - that will push dirty
|
|
* state back up into the VFS and then periodic inode flushing
|
|
* will prevent log covering from making progress. Hence we
|
|
* synchronously log the superblock instead to ensure the
|
|
* superblock is immediately unpinned and can be written back.
|
|
*/
|
|
xlog_clear_incompat(log);
|
|
xfs_sync_sb(mp, true);
|
|
} else
|
|
xfs_log_force(mp, 0);
|
|
|
|
/* start pushing all the metadata that is currently dirty */
|
|
xfs_ail_push_all(mp->m_ail);
|
|
|
|
/* queue us up again */
|
|
xfs_log_work_queue(mp);
|
|
}
|
|
|
|
/*
|
|
* This routine initializes some of the log structure for a given mount point.
|
|
* Its primary purpose is to fill in enough, so recovery can occur. However,
|
|
* some other stuff may be filled in too.
|
|
*/
|
|
STATIC struct xlog *
|
|
xlog_alloc_log(
|
|
struct xfs_mount *mp,
|
|
struct xfs_buftarg *log_target,
|
|
xfs_daddr_t blk_offset,
|
|
int num_bblks)
|
|
{
|
|
struct xlog *log;
|
|
xlog_rec_header_t *head;
|
|
xlog_in_core_t **iclogp;
|
|
xlog_in_core_t *iclog, *prev_iclog=NULL;
|
|
int i;
|
|
int error = -ENOMEM;
|
|
uint log2_size = 0;
|
|
|
|
log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL);
|
|
if (!log) {
|
|
xfs_warn(mp, "Log allocation failed: No memory!");
|
|
goto out;
|
|
}
|
|
|
|
log->l_mp = mp;
|
|
log->l_targ = log_target;
|
|
log->l_logsize = BBTOB(num_bblks);
|
|
log->l_logBBstart = blk_offset;
|
|
log->l_logBBsize = num_bblks;
|
|
log->l_covered_state = XLOG_STATE_COVER_IDLE;
|
|
set_bit(XLOG_ACTIVE_RECOVERY, &log->l_opstate);
|
|
INIT_DELAYED_WORK(&log->l_work, xfs_log_worker);
|
|
|
|
log->l_prev_block = -1;
|
|
/* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
|
|
xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0);
|
|
xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0);
|
|
log->l_curr_cycle = 1; /* 0 is bad since this is initial value */
|
|
|
|
if (xfs_has_logv2(mp) && mp->m_sb.sb_logsunit > 1)
|
|
log->l_iclog_roundoff = mp->m_sb.sb_logsunit;
|
|
else
|
|
log->l_iclog_roundoff = BBSIZE;
|
|
|
|
xlog_grant_head_init(&log->l_reserve_head);
|
|
xlog_grant_head_init(&log->l_write_head);
|
|
|
|
error = -EFSCORRUPTED;
|
|
if (xfs_has_sector(mp)) {
|
|
log2_size = mp->m_sb.sb_logsectlog;
|
|
if (log2_size < BBSHIFT) {
|
|
xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)",
|
|
log2_size, BBSHIFT);
|
|
goto out_free_log;
|
|
}
|
|
|
|
log2_size -= BBSHIFT;
|
|
if (log2_size > mp->m_sectbb_log) {
|
|
xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)",
|
|
log2_size, mp->m_sectbb_log);
|
|
goto out_free_log;
|
|
}
|
|
|
|
/* for larger sector sizes, must have v2 or external log */
|
|
if (log2_size && log->l_logBBstart > 0 &&
|
|
!xfs_has_logv2(mp)) {
|
|
xfs_warn(mp,
|
|
"log sector size (0x%x) invalid for configuration.",
|
|
log2_size);
|
|
goto out_free_log;
|
|
}
|
|
}
|
|
log->l_sectBBsize = 1 << log2_size;
|
|
|
|
init_rwsem(&log->l_incompat_users);
|
|
|
|
xlog_get_iclog_buffer_size(mp, log);
|
|
|
|
spin_lock_init(&log->l_icloglock);
|
|
init_waitqueue_head(&log->l_flush_wait);
|
|
|
|
iclogp = &log->l_iclog;
|
|
/*
|
|
* The amount of memory to allocate for the iclog structure is
|
|
* rather funky due to the way the structure is defined. It is
|
|
* done this way so that we can use different sizes for machines
|
|
* with different amounts of memory. See the definition of
|
|
* xlog_in_core_t in xfs_log_priv.h for details.
|
|
*/
|
|
ASSERT(log->l_iclog_size >= 4096);
|
|
for (i = 0; i < log->l_iclog_bufs; i++) {
|
|
size_t bvec_size = howmany(log->l_iclog_size, PAGE_SIZE) *
|
|
sizeof(struct bio_vec);
|
|
|
|
iclog = kmem_zalloc(sizeof(*iclog) + bvec_size, KM_MAYFAIL);
|
|
if (!iclog)
|
|
goto out_free_iclog;
|
|
|
|
*iclogp = iclog;
|
|
iclog->ic_prev = prev_iclog;
|
|
prev_iclog = iclog;
|
|
|
|
iclog->ic_data = kvzalloc(log->l_iclog_size,
|
|
GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
|
if (!iclog->ic_data)
|
|
goto out_free_iclog;
|
|
head = &iclog->ic_header;
|
|
memset(head, 0, sizeof(xlog_rec_header_t));
|
|
head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
|
|
head->h_version = cpu_to_be32(
|
|
xfs_has_logv2(log->l_mp) ? 2 : 1);
|
|
head->h_size = cpu_to_be32(log->l_iclog_size);
|
|
/* new fields */
|
|
head->h_fmt = cpu_to_be32(XLOG_FMT);
|
|
memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
|
|
|
|
iclog->ic_size = log->l_iclog_size - log->l_iclog_hsize;
|
|
iclog->ic_state = XLOG_STATE_ACTIVE;
|
|
iclog->ic_log = log;
|
|
atomic_set(&iclog->ic_refcnt, 0);
|
|
INIT_LIST_HEAD(&iclog->ic_callbacks);
|
|
iclog->ic_datap = (void *)iclog->ic_data + log->l_iclog_hsize;
|
|
|
|
init_waitqueue_head(&iclog->ic_force_wait);
|
|
init_waitqueue_head(&iclog->ic_write_wait);
|
|
INIT_WORK(&iclog->ic_end_io_work, xlog_ioend_work);
|
|
sema_init(&iclog->ic_sema, 1);
|
|
|
|
iclogp = &iclog->ic_next;
|
|
}
|
|
*iclogp = log->l_iclog; /* complete ring */
|
|
log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
|
|
|
|
log->l_ioend_workqueue = alloc_workqueue("xfs-log/%s",
|
|
XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM |
|
|
WQ_HIGHPRI),
|
|
0, mp->m_super->s_id);
|
|
if (!log->l_ioend_workqueue)
|
|
goto out_free_iclog;
|
|
|
|
error = xlog_cil_init(log);
|
|
if (error)
|
|
goto out_destroy_workqueue;
|
|
return log;
|
|
|
|
out_destroy_workqueue:
|
|
destroy_workqueue(log->l_ioend_workqueue);
|
|
out_free_iclog:
|
|
for (iclog = log->l_iclog; iclog; iclog = prev_iclog) {
|
|
prev_iclog = iclog->ic_next;
|
|
kmem_free(iclog->ic_data);
|
|
kmem_free(iclog);
|
|
if (prev_iclog == log->l_iclog)
|
|
break;
|
|
}
|
|
out_free_log:
|
|
kmem_free(log);
|
|
out:
|
|
return ERR_PTR(error);
|
|
} /* xlog_alloc_log */
|
|
|
|
/*
|
|
* Compute the LSN that we'd need to push the log tail towards in order to have
|
|
* (a) enough on-disk log space to log the number of bytes specified, (b) at
|
|
* least 25% of the log space free, and (c) at least 256 blocks free. If the
|
|
* log free space already meets all three thresholds, this function returns
|
|
* NULLCOMMITLSN.
|
|
*/
|
|
xfs_lsn_t
|
|
xlog_grant_push_threshold(
|
|
struct xlog *log,
|
|
int need_bytes)
|
|
{
|
|
xfs_lsn_t threshold_lsn = 0;
|
|
xfs_lsn_t last_sync_lsn;
|
|
int free_blocks;
|
|
int free_bytes;
|
|
int threshold_block;
|
|
int threshold_cycle;
|
|
int free_threshold;
|
|
|
|
ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
|
|
|
|
free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
|
|
free_blocks = BTOBBT(free_bytes);
|
|
|
|
/*
|
|
* Set the threshold for the minimum number of free blocks in the
|
|
* log to the maximum of what the caller needs, one quarter of the
|
|
* log, and 256 blocks.
|
|
*/
|
|
free_threshold = BTOBB(need_bytes);
|
|
free_threshold = max(free_threshold, (log->l_logBBsize >> 2));
|
|
free_threshold = max(free_threshold, 256);
|
|
if (free_blocks >= free_threshold)
|
|
return NULLCOMMITLSN;
|
|
|
|
xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle,
|
|
&threshold_block);
|
|
threshold_block += free_threshold;
|
|
if (threshold_block >= log->l_logBBsize) {
|
|
threshold_block -= log->l_logBBsize;
|
|
threshold_cycle += 1;
|
|
}
|
|
threshold_lsn = xlog_assign_lsn(threshold_cycle,
|
|
threshold_block);
|
|
/*
|
|
* Don't pass in an lsn greater than the lsn of the last
|
|
* log record known to be on disk. Use a snapshot of the last sync lsn
|
|
* so that it doesn't change between the compare and the set.
|
|
*/
|
|
last_sync_lsn = atomic64_read(&log->l_last_sync_lsn);
|
|
if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0)
|
|
threshold_lsn = last_sync_lsn;
|
|
|
|
return threshold_lsn;
|
|
}
|
|
|
|
/*
|
|
* Push the tail of the log if we need to do so to maintain the free log space
|
|
* thresholds set out by xlog_grant_push_threshold. We may need to adopt a
|
|
* policy which pushes on an lsn which is further along in the log once we
|
|
* reach the high water mark. In this manner, we would be creating a low water
|
|
* mark.
|
|
*/
|
|
STATIC void
|
|
xlog_grant_push_ail(
|
|
struct xlog *log,
|
|
int need_bytes)
|
|
{
|
|
xfs_lsn_t threshold_lsn;
|
|
|
|
threshold_lsn = xlog_grant_push_threshold(log, need_bytes);
|
|
if (threshold_lsn == NULLCOMMITLSN || xlog_is_shutdown(log))
|
|
return;
|
|
|
|
/*
|
|
* Get the transaction layer to kick the dirty buffers out to
|
|
* disk asynchronously. No point in trying to do this if
|
|
* the filesystem is shutting down.
|
|
*/
|
|
xfs_ail_push(log->l_ailp, threshold_lsn);
|
|
}
|
|
|
|
/*
|
|
* Stamp cycle number in every block
|
|
*/
|
|
STATIC void
|
|
xlog_pack_data(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
int roundoff)
|
|
{
|
|
int i, j, k;
|
|
int size = iclog->ic_offset + roundoff;
|
|
__be32 cycle_lsn;
|
|
char *dp;
|
|
|
|
cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn);
|
|
|
|
dp = iclog->ic_datap;
|
|
for (i = 0; i < BTOBB(size); i++) {
|
|
if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE))
|
|
break;
|
|
iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp;
|
|
*(__be32 *)dp = cycle_lsn;
|
|
dp += BBSIZE;
|
|
}
|
|
|
|
if (xfs_has_logv2(log->l_mp)) {
|
|
xlog_in_core_2_t *xhdr = iclog->ic_data;
|
|
|
|
for ( ; i < BTOBB(size); i++) {
|
|
j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp;
|
|
*(__be32 *)dp = cycle_lsn;
|
|
dp += BBSIZE;
|
|
}
|
|
|
|
for (i = 1; i < log->l_iclog_heads; i++)
|
|
xhdr[i].hic_xheader.xh_cycle = cycle_lsn;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calculate the checksum for a log buffer.
|
|
*
|
|
* This is a little more complicated than it should be because the various
|
|
* headers and the actual data are non-contiguous.
|
|
*/
|
|
__le32
|
|
xlog_cksum(
|
|
struct xlog *log,
|
|
struct xlog_rec_header *rhead,
|
|
char *dp,
|
|
int size)
|
|
{
|
|
uint32_t crc;
|
|
|
|
/* first generate the crc for the record header ... */
|
|
crc = xfs_start_cksum_update((char *)rhead,
|
|
sizeof(struct xlog_rec_header),
|
|
offsetof(struct xlog_rec_header, h_crc));
|
|
|
|
/* ... then for additional cycle data for v2 logs ... */
|
|
if (xfs_has_logv2(log->l_mp)) {
|
|
union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead;
|
|
int i;
|
|
int xheads;
|
|
|
|
xheads = DIV_ROUND_UP(size, XLOG_HEADER_CYCLE_SIZE);
|
|
|
|
for (i = 1; i < xheads; i++) {
|
|
crc = crc32c(crc, &xhdr[i].hic_xheader,
|
|
sizeof(struct xlog_rec_ext_header));
|
|
}
|
|
}
|
|
|
|
/* ... and finally for the payload */
|
|
crc = crc32c(crc, dp, size);
|
|
|
|
return xfs_end_cksum(crc);
|
|
}
|
|
|
|
static void
|
|
xlog_bio_end_io(
|
|
struct bio *bio)
|
|
{
|
|
struct xlog_in_core *iclog = bio->bi_private;
|
|
|
|
queue_work(iclog->ic_log->l_ioend_workqueue,
|
|
&iclog->ic_end_io_work);
|
|
}
|
|
|
|
static int
|
|
xlog_map_iclog_data(
|
|
struct bio *bio,
|
|
void *data,
|
|
size_t count)
|
|
{
|
|
do {
|
|
struct page *page = kmem_to_page(data);
|
|
unsigned int off = offset_in_page(data);
|
|
size_t len = min_t(size_t, count, PAGE_SIZE - off);
|
|
|
|
if (bio_add_page(bio, page, len, off) != len)
|
|
return -EIO;
|
|
|
|
data += len;
|
|
count -= len;
|
|
} while (count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
STATIC void
|
|
xlog_write_iclog(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
uint64_t bno,
|
|
unsigned int count)
|
|
{
|
|
ASSERT(bno < log->l_logBBsize);
|
|
trace_xlog_iclog_write(iclog, _RET_IP_);
|
|
|
|
/*
|
|
* We lock the iclogbufs here so that we can serialise against I/O
|
|
* completion during unmount. We might be processing a shutdown
|
|
* triggered during unmount, and that can occur asynchronously to the
|
|
* unmount thread, and hence we need to ensure that completes before
|
|
* tearing down the iclogbufs. Hence we need to hold the buffer lock
|
|
* across the log IO to archieve that.
|
|
*/
|
|
down(&iclog->ic_sema);
|
|
if (xlog_is_shutdown(log)) {
|
|
/*
|
|
* It would seem logical to return EIO here, but we rely on
|
|
* the log state machine to propagate I/O errors instead of
|
|
* doing it here. We kick of the state machine and unlock
|
|
* the buffer manually, the code needs to be kept in sync
|
|
* with the I/O completion path.
|
|
*/
|
|
xlog_state_done_syncing(iclog);
|
|
up(&iclog->ic_sema);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We use REQ_SYNC | REQ_IDLE here to tell the block layer the are more
|
|
* IOs coming immediately after this one. This prevents the block layer
|
|
* writeback throttle from throttling log writes behind background
|
|
* metadata writeback and causing priority inversions.
|
|
*/
|
|
bio_init(&iclog->ic_bio, log->l_targ->bt_bdev, iclog->ic_bvec,
|
|
howmany(count, PAGE_SIZE),
|
|
REQ_OP_WRITE | REQ_META | REQ_SYNC | REQ_IDLE);
|
|
iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart + bno;
|
|
iclog->ic_bio.bi_end_io = xlog_bio_end_io;
|
|
iclog->ic_bio.bi_private = iclog;
|
|
|
|
if (iclog->ic_flags & XLOG_ICL_NEED_FLUSH) {
|
|
iclog->ic_bio.bi_opf |= REQ_PREFLUSH;
|
|
/*
|
|
* For external log devices, we also need to flush the data
|
|
* device cache first to ensure all metadata writeback covered
|
|
* by the LSN in this iclog is on stable storage. This is slow,
|
|
* but it *must* complete before we issue the external log IO.
|
|
*
|
|
* If the flush fails, we cannot conclude that past metadata
|
|
* writeback from the log succeeded. Repeating the flush is
|
|
* not possible, hence we must shut down with log IO error to
|
|
* avoid shutdown re-entering this path and erroring out again.
|
|
*/
|
|
if (log->l_targ != log->l_mp->m_ddev_targp &&
|
|
blkdev_issue_flush(log->l_mp->m_ddev_targp->bt_bdev)) {
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
return;
|
|
}
|
|
}
|
|
if (iclog->ic_flags & XLOG_ICL_NEED_FUA)
|
|
iclog->ic_bio.bi_opf |= REQ_FUA;
|
|
|
|
iclog->ic_flags &= ~(XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA);
|
|
|
|
if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count)) {
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
return;
|
|
}
|
|
if (is_vmalloc_addr(iclog->ic_data))
|
|
flush_kernel_vmap_range(iclog->ic_data, count);
|
|
|
|
/*
|
|
* If this log buffer would straddle the end of the log we will have
|
|
* to split it up into two bios, so that we can continue at the start.
|
|
*/
|
|
if (bno + BTOBB(count) > log->l_logBBsize) {
|
|
struct bio *split;
|
|
|
|
split = bio_split(&iclog->ic_bio, log->l_logBBsize - bno,
|
|
GFP_NOIO, &fs_bio_set);
|
|
bio_chain(split, &iclog->ic_bio);
|
|
submit_bio(split);
|
|
|
|
/* restart at logical offset zero for the remainder */
|
|
iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart;
|
|
}
|
|
|
|
submit_bio(&iclog->ic_bio);
|
|
}
|
|
|
|
/*
|
|
* We need to bump cycle number for the part of the iclog that is
|
|
* written to the start of the log. Watch out for the header magic
|
|
* number case, though.
|
|
*/
|
|
static void
|
|
xlog_split_iclog(
|
|
struct xlog *log,
|
|
void *data,
|
|
uint64_t bno,
|
|
unsigned int count)
|
|
{
|
|
unsigned int split_offset = BBTOB(log->l_logBBsize - bno);
|
|
unsigned int i;
|
|
|
|
for (i = split_offset; i < count; i += BBSIZE) {
|
|
uint32_t cycle = get_unaligned_be32(data + i);
|
|
|
|
if (++cycle == XLOG_HEADER_MAGIC_NUM)
|
|
cycle++;
|
|
put_unaligned_be32(cycle, data + i);
|
|
}
|
|
}
|
|
|
|
static int
|
|
xlog_calc_iclog_size(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
uint32_t *roundoff)
|
|
{
|
|
uint32_t count_init, count;
|
|
|
|
/* Add for LR header */
|
|
count_init = log->l_iclog_hsize + iclog->ic_offset;
|
|
count = roundup(count_init, log->l_iclog_roundoff);
|
|
|
|
*roundoff = count - count_init;
|
|
|
|
ASSERT(count >= count_init);
|
|
ASSERT(*roundoff < log->l_iclog_roundoff);
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Flush out the in-core log (iclog) to the on-disk log in an asynchronous
|
|
* fashion. Previously, we should have moved the current iclog
|
|
* ptr in the log to point to the next available iclog. This allows further
|
|
* write to continue while this code syncs out an iclog ready to go.
|
|
* Before an in-core log can be written out, the data section must be scanned
|
|
* to save away the 1st word of each BBSIZE block into the header. We replace
|
|
* it with the current cycle count. Each BBSIZE block is tagged with the
|
|
* cycle count because there in an implicit assumption that drives will
|
|
* guarantee that entire 512 byte blocks get written at once. In other words,
|
|
* we can't have part of a 512 byte block written and part not written. By
|
|
* tagging each block, we will know which blocks are valid when recovering
|
|
* after an unclean shutdown.
|
|
*
|
|
* This routine is single threaded on the iclog. No other thread can be in
|
|
* this routine with the same iclog. Changing contents of iclog can there-
|
|
* fore be done without grabbing the state machine lock. Updating the global
|
|
* log will require grabbing the lock though.
|
|
*
|
|
* The entire log manager uses a logical block numbering scheme. Only
|
|
* xlog_write_iclog knows about the fact that the log may not start with
|
|
* block zero on a given device.
|
|
*/
|
|
STATIC void
|
|
xlog_sync(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
unsigned int count; /* byte count of bwrite */
|
|
unsigned int roundoff; /* roundoff to BB or stripe */
|
|
uint64_t bno;
|
|
unsigned int size;
|
|
|
|
ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
|
|
trace_xlog_iclog_sync(iclog, _RET_IP_);
|
|
|
|
count = xlog_calc_iclog_size(log, iclog, &roundoff);
|
|
|
|
/*
|
|
* If we have a ticket, account for the roundoff via the ticket
|
|
* reservation to avoid touching the hot grant heads needlessly.
|
|
* Otherwise, we have to move grant heads directly.
|
|
*/
|
|
if (ticket) {
|
|
ticket->t_curr_res -= roundoff;
|
|
} else {
|
|
xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff);
|
|
xlog_grant_add_space(log, &log->l_write_head.grant, roundoff);
|
|
}
|
|
|
|
/* put cycle number in every block */
|
|
xlog_pack_data(log, iclog, roundoff);
|
|
|
|
/* real byte length */
|
|
size = iclog->ic_offset;
|
|
if (xfs_has_logv2(log->l_mp))
|
|
size += roundoff;
|
|
iclog->ic_header.h_len = cpu_to_be32(size);
|
|
|
|
XFS_STATS_INC(log->l_mp, xs_log_writes);
|
|
XFS_STATS_ADD(log->l_mp, xs_log_blocks, BTOBB(count));
|
|
|
|
bno = BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn));
|
|
|
|
/* Do we need to split this write into 2 parts? */
|
|
if (bno + BTOBB(count) > log->l_logBBsize)
|
|
xlog_split_iclog(log, &iclog->ic_header, bno, count);
|
|
|
|
/* calculcate the checksum */
|
|
iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header,
|
|
iclog->ic_datap, size);
|
|
/*
|
|
* Intentionally corrupt the log record CRC based on the error injection
|
|
* frequency, if defined. This facilitates testing log recovery in the
|
|
* event of torn writes. Hence, set the IOABORT state to abort the log
|
|
* write on I/O completion and shutdown the fs. The subsequent mount
|
|
* detects the bad CRC and attempts to recover.
|
|
*/
|
|
#ifdef DEBUG
|
|
if (XFS_TEST_ERROR(false, log->l_mp, XFS_ERRTAG_LOG_BAD_CRC)) {
|
|
iclog->ic_header.h_crc &= cpu_to_le32(0xAAAAAAAA);
|
|
iclog->ic_fail_crc = true;
|
|
xfs_warn(log->l_mp,
|
|
"Intentionally corrupted log record at LSN 0x%llx. Shutdown imminent.",
|
|
be64_to_cpu(iclog->ic_header.h_lsn));
|
|
}
|
|
#endif
|
|
xlog_verify_iclog(log, iclog, count);
|
|
xlog_write_iclog(log, iclog, bno, count);
|
|
}
|
|
|
|
/*
|
|
* Deallocate a log structure
|
|
*/
|
|
STATIC void
|
|
xlog_dealloc_log(
|
|
struct xlog *log)
|
|
{
|
|
xlog_in_core_t *iclog, *next_iclog;
|
|
int i;
|
|
|
|
/*
|
|
* Destroy the CIL after waiting for iclog IO completion because an
|
|
* iclog EIO error will try to shut down the log, which accesses the
|
|
* CIL to wake up the waiters.
|
|
*/
|
|
xlog_cil_destroy(log);
|
|
|
|
iclog = log->l_iclog;
|
|
for (i = 0; i < log->l_iclog_bufs; i++) {
|
|
next_iclog = iclog->ic_next;
|
|
kmem_free(iclog->ic_data);
|
|
kmem_free(iclog);
|
|
iclog = next_iclog;
|
|
}
|
|
|
|
log->l_mp->m_log = NULL;
|
|
destroy_workqueue(log->l_ioend_workqueue);
|
|
kmem_free(log);
|
|
}
|
|
|
|
/*
|
|
* Update counters atomically now that memcpy is done.
|
|
*/
|
|
static inline void
|
|
xlog_state_finish_copy(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
int record_cnt,
|
|
int copy_bytes)
|
|
{
|
|
lockdep_assert_held(&log->l_icloglock);
|
|
|
|
be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt);
|
|
iclog->ic_offset += copy_bytes;
|
|
}
|
|
|
|
/*
|
|
* print out info relating to regions written which consume
|
|
* the reservation
|
|
*/
|
|
void
|
|
xlog_print_tic_res(
|
|
struct xfs_mount *mp,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
xfs_warn(mp, "ticket reservation summary:");
|
|
xfs_warn(mp, " unit res = %d bytes", ticket->t_unit_res);
|
|
xfs_warn(mp, " current res = %d bytes", ticket->t_curr_res);
|
|
xfs_warn(mp, " original count = %d", ticket->t_ocnt);
|
|
xfs_warn(mp, " remaining count = %d", ticket->t_cnt);
|
|
}
|
|
|
|
/*
|
|
* Print a summary of the transaction.
|
|
*/
|
|
void
|
|
xlog_print_trans(
|
|
struct xfs_trans *tp)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_log_item *lip;
|
|
|
|
/* dump core transaction and ticket info */
|
|
xfs_warn(mp, "transaction summary:");
|
|
xfs_warn(mp, " log res = %d", tp->t_log_res);
|
|
xfs_warn(mp, " log count = %d", tp->t_log_count);
|
|
xfs_warn(mp, " flags = 0x%x", tp->t_flags);
|
|
|
|
xlog_print_tic_res(mp, tp->t_ticket);
|
|
|
|
/* dump each log item */
|
|
list_for_each_entry(lip, &tp->t_items, li_trans) {
|
|
struct xfs_log_vec *lv = lip->li_lv;
|
|
struct xfs_log_iovec *vec;
|
|
int i;
|
|
|
|
xfs_warn(mp, "log item: ");
|
|
xfs_warn(mp, " type = 0x%x", lip->li_type);
|
|
xfs_warn(mp, " flags = 0x%lx", lip->li_flags);
|
|
if (!lv)
|
|
continue;
|
|
xfs_warn(mp, " niovecs = %d", lv->lv_niovecs);
|
|
xfs_warn(mp, " size = %d", lv->lv_size);
|
|
xfs_warn(mp, " bytes = %d", lv->lv_bytes);
|
|
xfs_warn(mp, " buf len = %d", lv->lv_buf_len);
|
|
|
|
/* dump each iovec for the log item */
|
|
vec = lv->lv_iovecp;
|
|
for (i = 0; i < lv->lv_niovecs; i++) {
|
|
int dumplen = min(vec->i_len, 32);
|
|
|
|
xfs_warn(mp, " iovec[%d]", i);
|
|
xfs_warn(mp, " type = 0x%x", vec->i_type);
|
|
xfs_warn(mp, " len = %d", vec->i_len);
|
|
xfs_warn(mp, " first %d bytes of iovec[%d]:", dumplen, i);
|
|
xfs_hex_dump(vec->i_addr, dumplen);
|
|
|
|
vec++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
xlog_write_iovec(
|
|
struct xlog_in_core *iclog,
|
|
uint32_t *log_offset,
|
|
void *data,
|
|
uint32_t write_len,
|
|
int *bytes_left,
|
|
uint32_t *record_cnt,
|
|
uint32_t *data_cnt)
|
|
{
|
|
ASSERT(*log_offset < iclog->ic_log->l_iclog_size);
|
|
ASSERT(*log_offset % sizeof(int32_t) == 0);
|
|
ASSERT(write_len % sizeof(int32_t) == 0);
|
|
|
|
memcpy(iclog->ic_datap + *log_offset, data, write_len);
|
|
*log_offset += write_len;
|
|
*bytes_left -= write_len;
|
|
(*record_cnt)++;
|
|
*data_cnt += write_len;
|
|
}
|
|
|
|
/*
|
|
* Write log vectors into a single iclog which is guaranteed by the caller
|
|
* to have enough space to write the entire log vector into.
|
|
*/
|
|
static void
|
|
xlog_write_full(
|
|
struct xfs_log_vec *lv,
|
|
struct xlog_ticket *ticket,
|
|
struct xlog_in_core *iclog,
|
|
uint32_t *log_offset,
|
|
uint32_t *len,
|
|
uint32_t *record_cnt,
|
|
uint32_t *data_cnt)
|
|
{
|
|
int index;
|
|
|
|
ASSERT(*log_offset + *len <= iclog->ic_size ||
|
|
iclog->ic_state == XLOG_STATE_WANT_SYNC);
|
|
|
|
/*
|
|
* Ordered log vectors have no regions to write so this
|
|
* loop will naturally skip them.
|
|
*/
|
|
for (index = 0; index < lv->lv_niovecs; index++) {
|
|
struct xfs_log_iovec *reg = &lv->lv_iovecp[index];
|
|
struct xlog_op_header *ophdr = reg->i_addr;
|
|
|
|
ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
|
|
xlog_write_iovec(iclog, log_offset, reg->i_addr,
|
|
reg->i_len, len, record_cnt, data_cnt);
|
|
}
|
|
}
|
|
|
|
static int
|
|
xlog_write_get_more_iclog_space(
|
|
struct xlog_ticket *ticket,
|
|
struct xlog_in_core **iclogp,
|
|
uint32_t *log_offset,
|
|
uint32_t len,
|
|
uint32_t *record_cnt,
|
|
uint32_t *data_cnt)
|
|
{
|
|
struct xlog_in_core *iclog = *iclogp;
|
|
struct xlog *log = iclog->ic_log;
|
|
int error;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
ASSERT(iclog->ic_state == XLOG_STATE_WANT_SYNC);
|
|
xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt);
|
|
error = xlog_state_release_iclog(log, iclog, ticket);
|
|
spin_unlock(&log->l_icloglock);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
|
|
log_offset);
|
|
if (error)
|
|
return error;
|
|
*record_cnt = 0;
|
|
*data_cnt = 0;
|
|
*iclogp = iclog;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write log vectors into a single iclog which is smaller than the current chain
|
|
* length. We write until we cannot fit a full record into the remaining space
|
|
* and then stop. We return the log vector that is to be written that cannot
|
|
* wholly fit in the iclog.
|
|
*/
|
|
static int
|
|
xlog_write_partial(
|
|
struct xfs_log_vec *lv,
|
|
struct xlog_ticket *ticket,
|
|
struct xlog_in_core **iclogp,
|
|
uint32_t *log_offset,
|
|
uint32_t *len,
|
|
uint32_t *record_cnt,
|
|
uint32_t *data_cnt)
|
|
{
|
|
struct xlog_in_core *iclog = *iclogp;
|
|
struct xlog_op_header *ophdr;
|
|
int index = 0;
|
|
uint32_t rlen;
|
|
int error;
|
|
|
|
/* walk the logvec, copying until we run out of space in the iclog */
|
|
for (index = 0; index < lv->lv_niovecs; index++) {
|
|
struct xfs_log_iovec *reg = &lv->lv_iovecp[index];
|
|
uint32_t reg_offset = 0;
|
|
|
|
/*
|
|
* The first region of a continuation must have a non-zero
|
|
* length otherwise log recovery will just skip over it and
|
|
* start recovering from the next opheader it finds. Because we
|
|
* mark the next opheader as a continuation, recovery will then
|
|
* incorrectly add the continuation to the previous region and
|
|
* that breaks stuff.
|
|
*
|
|
* Hence if there isn't space for region data after the
|
|
* opheader, then we need to start afresh with a new iclog.
|
|
*/
|
|
if (iclog->ic_size - *log_offset <=
|
|
sizeof(struct xlog_op_header)) {
|
|
error = xlog_write_get_more_iclog_space(ticket,
|
|
&iclog, log_offset, *len, record_cnt,
|
|
data_cnt);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
ophdr = reg->i_addr;
|
|
rlen = min_t(uint32_t, reg->i_len, iclog->ic_size - *log_offset);
|
|
|
|
ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
|
|
ophdr->oh_len = cpu_to_be32(rlen - sizeof(struct xlog_op_header));
|
|
if (rlen != reg->i_len)
|
|
ophdr->oh_flags |= XLOG_CONTINUE_TRANS;
|
|
|
|
xlog_write_iovec(iclog, log_offset, reg->i_addr,
|
|
rlen, len, record_cnt, data_cnt);
|
|
|
|
/* If we wrote the whole region, move to the next. */
|
|
if (rlen == reg->i_len)
|
|
continue;
|
|
|
|
/*
|
|
* We now have a partially written iovec, but it can span
|
|
* multiple iclogs so we loop here. First we release the iclog
|
|
* we currently have, then we get a new iclog and add a new
|
|
* opheader. Then we continue copying from where we were until
|
|
* we either complete the iovec or fill the iclog. If we
|
|
* complete the iovec, then we increment the index and go right
|
|
* back to the top of the outer loop. if we fill the iclog, we
|
|
* run the inner loop again.
|
|
*
|
|
* This is complicated by the tail of a region using all the
|
|
* space in an iclog and hence requiring us to release the iclog
|
|
* and get a new one before returning to the outer loop. We must
|
|
* always guarantee that we exit this inner loop with at least
|
|
* space for log transaction opheaders left in the current
|
|
* iclog, hence we cannot just terminate the loop at the end
|
|
* of the of the continuation. So we loop while there is no
|
|
* space left in the current iclog, and check for the end of the
|
|
* continuation after getting a new iclog.
|
|
*/
|
|
do {
|
|
/*
|
|
* Ensure we include the continuation opheader in the
|
|
* space we need in the new iclog by adding that size
|
|
* to the length we require. This continuation opheader
|
|
* needs to be accounted to the ticket as the space it
|
|
* consumes hasn't been accounted to the lv we are
|
|
* writing.
|
|
*/
|
|
error = xlog_write_get_more_iclog_space(ticket,
|
|
&iclog, log_offset,
|
|
*len + sizeof(struct xlog_op_header),
|
|
record_cnt, data_cnt);
|
|
if (error)
|
|
return error;
|
|
|
|
ophdr = iclog->ic_datap + *log_offset;
|
|
ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
|
|
ophdr->oh_clientid = XFS_TRANSACTION;
|
|
ophdr->oh_res2 = 0;
|
|
ophdr->oh_flags = XLOG_WAS_CONT_TRANS;
|
|
|
|
ticket->t_curr_res -= sizeof(struct xlog_op_header);
|
|
*log_offset += sizeof(struct xlog_op_header);
|
|
*data_cnt += sizeof(struct xlog_op_header);
|
|
|
|
/*
|
|
* If rlen fits in the iclog, then end the region
|
|
* continuation. Otherwise we're going around again.
|
|
*/
|
|
reg_offset += rlen;
|
|
rlen = reg->i_len - reg_offset;
|
|
if (rlen <= iclog->ic_size - *log_offset)
|
|
ophdr->oh_flags |= XLOG_END_TRANS;
|
|
else
|
|
ophdr->oh_flags |= XLOG_CONTINUE_TRANS;
|
|
|
|
rlen = min_t(uint32_t, rlen, iclog->ic_size - *log_offset);
|
|
ophdr->oh_len = cpu_to_be32(rlen);
|
|
|
|
xlog_write_iovec(iclog, log_offset,
|
|
reg->i_addr + reg_offset,
|
|
rlen, len, record_cnt, data_cnt);
|
|
|
|
} while (ophdr->oh_flags & XLOG_CONTINUE_TRANS);
|
|
}
|
|
|
|
/*
|
|
* No more iovecs remain in this logvec so return the next log vec to
|
|
* the caller so it can go back to fast path copying.
|
|
*/
|
|
*iclogp = iclog;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write some region out to in-core log
|
|
*
|
|
* This will be called when writing externally provided regions or when
|
|
* writing out a commit record for a given transaction.
|
|
*
|
|
* General algorithm:
|
|
* 1. Find total length of this write. This may include adding to the
|
|
* lengths passed in.
|
|
* 2. Check whether we violate the tickets reservation.
|
|
* 3. While writing to this iclog
|
|
* A. Reserve as much space in this iclog as can get
|
|
* B. If this is first write, save away start lsn
|
|
* C. While writing this region:
|
|
* 1. If first write of transaction, write start record
|
|
* 2. Write log operation header (header per region)
|
|
* 3. Find out if we can fit entire region into this iclog
|
|
* 4. Potentially, verify destination memcpy ptr
|
|
* 5. Memcpy (partial) region
|
|
* 6. If partial copy, release iclog; otherwise, continue
|
|
* copying more regions into current iclog
|
|
* 4. Mark want sync bit (in simulation mode)
|
|
* 5. Release iclog for potential flush to on-disk log.
|
|
*
|
|
* ERRORS:
|
|
* 1. Panic if reservation is overrun. This should never happen since
|
|
* reservation amounts are generated internal to the filesystem.
|
|
* NOTES:
|
|
* 1. Tickets are single threaded data structures.
|
|
* 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
|
|
* syncing routine. When a single log_write region needs to span
|
|
* multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
|
|
* on all log operation writes which don't contain the end of the
|
|
* region. The XLOG_END_TRANS bit is used for the in-core log
|
|
* operation which contains the end of the continued log_write region.
|
|
* 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
|
|
* we don't really know exactly how much space will be used. As a result,
|
|
* we don't update ic_offset until the end when we know exactly how many
|
|
* bytes have been written out.
|
|
*/
|
|
int
|
|
xlog_write(
|
|
struct xlog *log,
|
|
struct xfs_cil_ctx *ctx,
|
|
struct list_head *lv_chain,
|
|
struct xlog_ticket *ticket,
|
|
uint32_t len)
|
|
|
|
{
|
|
struct xlog_in_core *iclog = NULL;
|
|
struct xfs_log_vec *lv;
|
|
uint32_t record_cnt = 0;
|
|
uint32_t data_cnt = 0;
|
|
int error = 0;
|
|
int log_offset;
|
|
|
|
if (ticket->t_curr_res < 0) {
|
|
xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
|
|
"ctx ticket reservation ran out. Need to up reservation");
|
|
xlog_print_tic_res(log->l_mp, ticket);
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
}
|
|
|
|
error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
|
|
&log_offset);
|
|
if (error)
|
|
return error;
|
|
|
|
ASSERT(log_offset <= iclog->ic_size - 1);
|
|
|
|
/*
|
|
* If we have a context pointer, pass it the first iclog we are
|
|
* writing to so it can record state needed for iclog write
|
|
* ordering.
|
|
*/
|
|
if (ctx)
|
|
xlog_cil_set_ctx_write_state(ctx, iclog);
|
|
|
|
list_for_each_entry(lv, lv_chain, lv_list) {
|
|
/*
|
|
* If the entire log vec does not fit in the iclog, punt it to
|
|
* the partial copy loop which can handle this case.
|
|
*/
|
|
if (lv->lv_niovecs &&
|
|
lv->lv_bytes > iclog->ic_size - log_offset) {
|
|
error = xlog_write_partial(lv, ticket, &iclog,
|
|
&log_offset, &len, &record_cnt,
|
|
&data_cnt);
|
|
if (error) {
|
|
/*
|
|
* We have no iclog to release, so just return
|
|
* the error immediately.
|
|
*/
|
|
return error;
|
|
}
|
|
} else {
|
|
xlog_write_full(lv, ticket, iclog, &log_offset,
|
|
&len, &record_cnt, &data_cnt);
|
|
}
|
|
}
|
|
ASSERT(len == 0);
|
|
|
|
/*
|
|
* We've already been guaranteed that the last writes will fit inside
|
|
* the current iclog, and hence it will already have the space used by
|
|
* those writes accounted to it. Hence we do not need to update the
|
|
* iclog with the number of bytes written here.
|
|
*/
|
|
spin_lock(&log->l_icloglock);
|
|
xlog_state_finish_copy(log, iclog, record_cnt, 0);
|
|
error = xlog_state_release_iclog(log, iclog, ticket);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
xlog_state_activate_iclog(
|
|
struct xlog_in_core *iclog,
|
|
int *iclogs_changed)
|
|
{
|
|
ASSERT(list_empty_careful(&iclog->ic_callbacks));
|
|
trace_xlog_iclog_activate(iclog, _RET_IP_);
|
|
|
|
/*
|
|
* If the number of ops in this iclog indicate it just contains the
|
|
* dummy transaction, we can change state into IDLE (the second time
|
|
* around). Otherwise we should change the state into NEED a dummy.
|
|
* We don't need to cover the dummy.
|
|
*/
|
|
if (*iclogs_changed == 0 &&
|
|
iclog->ic_header.h_num_logops == cpu_to_be32(XLOG_COVER_OPS)) {
|
|
*iclogs_changed = 1;
|
|
} else {
|
|
/*
|
|
* We have two dirty iclogs so start over. This could also be
|
|
* num of ops indicating this is not the dummy going out.
|
|
*/
|
|
*iclogs_changed = 2;
|
|
}
|
|
|
|
iclog->ic_state = XLOG_STATE_ACTIVE;
|
|
iclog->ic_offset = 0;
|
|
iclog->ic_header.h_num_logops = 0;
|
|
memset(iclog->ic_header.h_cycle_data, 0,
|
|
sizeof(iclog->ic_header.h_cycle_data));
|
|
iclog->ic_header.h_lsn = 0;
|
|
iclog->ic_header.h_tail_lsn = 0;
|
|
}
|
|
|
|
/*
|
|
* Loop through all iclogs and mark all iclogs currently marked DIRTY as
|
|
* ACTIVE after iclog I/O has completed.
|
|
*/
|
|
static void
|
|
xlog_state_activate_iclogs(
|
|
struct xlog *log,
|
|
int *iclogs_changed)
|
|
{
|
|
struct xlog_in_core *iclog = log->l_iclog;
|
|
|
|
do {
|
|
if (iclog->ic_state == XLOG_STATE_DIRTY)
|
|
xlog_state_activate_iclog(iclog, iclogs_changed);
|
|
/*
|
|
* The ordering of marking iclogs ACTIVE must be maintained, so
|
|
* an iclog doesn't become ACTIVE beyond one that is SYNCING.
|
|
*/
|
|
else if (iclog->ic_state != XLOG_STATE_ACTIVE)
|
|
break;
|
|
} while ((iclog = iclog->ic_next) != log->l_iclog);
|
|
}
|
|
|
|
static int
|
|
xlog_covered_state(
|
|
int prev_state,
|
|
int iclogs_changed)
|
|
{
|
|
/*
|
|
* We go to NEED for any non-covering writes. We go to NEED2 if we just
|
|
* wrote the first covering record (DONE). We go to IDLE if we just
|
|
* wrote the second covering record (DONE2) and remain in IDLE until a
|
|
* non-covering write occurs.
|
|
*/
|
|
switch (prev_state) {
|
|
case XLOG_STATE_COVER_IDLE:
|
|
if (iclogs_changed == 1)
|
|
return XLOG_STATE_COVER_IDLE;
|
|
fallthrough;
|
|
case XLOG_STATE_COVER_NEED:
|
|
case XLOG_STATE_COVER_NEED2:
|
|
break;
|
|
case XLOG_STATE_COVER_DONE:
|
|
if (iclogs_changed == 1)
|
|
return XLOG_STATE_COVER_NEED2;
|
|
break;
|
|
case XLOG_STATE_COVER_DONE2:
|
|
if (iclogs_changed == 1)
|
|
return XLOG_STATE_COVER_IDLE;
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
|
|
return XLOG_STATE_COVER_NEED;
|
|
}
|
|
|
|
STATIC void
|
|
xlog_state_clean_iclog(
|
|
struct xlog *log,
|
|
struct xlog_in_core *dirty_iclog)
|
|
{
|
|
int iclogs_changed = 0;
|
|
|
|
trace_xlog_iclog_clean(dirty_iclog, _RET_IP_);
|
|
|
|
dirty_iclog->ic_state = XLOG_STATE_DIRTY;
|
|
|
|
xlog_state_activate_iclogs(log, &iclogs_changed);
|
|
wake_up_all(&dirty_iclog->ic_force_wait);
|
|
|
|
if (iclogs_changed) {
|
|
log->l_covered_state = xlog_covered_state(log->l_covered_state,
|
|
iclogs_changed);
|
|
}
|
|
}
|
|
|
|
STATIC xfs_lsn_t
|
|
xlog_get_lowest_lsn(
|
|
struct xlog *log)
|
|
{
|
|
struct xlog_in_core *iclog = log->l_iclog;
|
|
xfs_lsn_t lowest_lsn = 0, lsn;
|
|
|
|
do {
|
|
if (iclog->ic_state == XLOG_STATE_ACTIVE ||
|
|
iclog->ic_state == XLOG_STATE_DIRTY)
|
|
continue;
|
|
|
|
lsn = be64_to_cpu(iclog->ic_header.h_lsn);
|
|
if ((lsn && !lowest_lsn) || XFS_LSN_CMP(lsn, lowest_lsn) < 0)
|
|
lowest_lsn = lsn;
|
|
} while ((iclog = iclog->ic_next) != log->l_iclog);
|
|
|
|
return lowest_lsn;
|
|
}
|
|
|
|
/*
|
|
* Completion of a iclog IO does not imply that a transaction has completed, as
|
|
* transactions can be large enough to span many iclogs. We cannot change the
|
|
* tail of the log half way through a transaction as this may be the only
|
|
* transaction in the log and moving the tail to point to the middle of it
|
|
* will prevent recovery from finding the start of the transaction. Hence we
|
|
* should only update the last_sync_lsn if this iclog contains transaction
|
|
* completion callbacks on it.
|
|
*
|
|
* We have to do this before we drop the icloglock to ensure we are the only one
|
|
* that can update it.
|
|
*
|
|
* If we are moving the last_sync_lsn forwards, we also need to ensure we kick
|
|
* the reservation grant head pushing. This is due to the fact that the push
|
|
* target is bound by the current last_sync_lsn value. Hence if we have a large
|
|
* amount of log space bound up in this committing transaction then the
|
|
* last_sync_lsn value may be the limiting factor preventing tail pushing from
|
|
* freeing space in the log. Hence once we've updated the last_sync_lsn we
|
|
* should push the AIL to ensure the push target (and hence the grant head) is
|
|
* no longer bound by the old log head location and can move forwards and make
|
|
* progress again.
|
|
*/
|
|
static void
|
|
xlog_state_set_callback(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
xfs_lsn_t header_lsn)
|
|
{
|
|
trace_xlog_iclog_callback(iclog, _RET_IP_);
|
|
iclog->ic_state = XLOG_STATE_CALLBACK;
|
|
|
|
ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn),
|
|
header_lsn) <= 0);
|
|
|
|
if (list_empty_careful(&iclog->ic_callbacks))
|
|
return;
|
|
|
|
atomic64_set(&log->l_last_sync_lsn, header_lsn);
|
|
xlog_grant_push_ail(log, 0);
|
|
}
|
|
|
|
/*
|
|
* Return true if we need to stop processing, false to continue to the next
|
|
* iclog. The caller will need to run callbacks if the iclog is returned in the
|
|
* XLOG_STATE_CALLBACK state.
|
|
*/
|
|
static bool
|
|
xlog_state_iodone_process_iclog(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog)
|
|
{
|
|
xfs_lsn_t lowest_lsn;
|
|
xfs_lsn_t header_lsn;
|
|
|
|
switch (iclog->ic_state) {
|
|
case XLOG_STATE_ACTIVE:
|
|
case XLOG_STATE_DIRTY:
|
|
/*
|
|
* Skip all iclogs in the ACTIVE & DIRTY states:
|
|
*/
|
|
return false;
|
|
case XLOG_STATE_DONE_SYNC:
|
|
/*
|
|
* Now that we have an iclog that is in the DONE_SYNC state, do
|
|
* one more check here to see if we have chased our tail around.
|
|
* If this is not the lowest lsn iclog, then we will leave it
|
|
* for another completion to process.
|
|
*/
|
|
header_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
|
|
lowest_lsn = xlog_get_lowest_lsn(log);
|
|
if (lowest_lsn && XFS_LSN_CMP(lowest_lsn, header_lsn) < 0)
|
|
return false;
|
|
xlog_state_set_callback(log, iclog, header_lsn);
|
|
return false;
|
|
default:
|
|
/*
|
|
* Can only perform callbacks in order. Since this iclog is not
|
|
* in the DONE_SYNC state, we skip the rest and just try to
|
|
* clean up.
|
|
*/
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Loop over all the iclogs, running attached callbacks on them. Return true if
|
|
* we ran any callbacks, indicating that we dropped the icloglock. We don't need
|
|
* to handle transient shutdown state here at all because
|
|
* xlog_state_shutdown_callbacks() will be run to do the necessary shutdown
|
|
* cleanup of the callbacks.
|
|
*/
|
|
static bool
|
|
xlog_state_do_iclog_callbacks(
|
|
struct xlog *log)
|
|
__releases(&log->l_icloglock)
|
|
__acquires(&log->l_icloglock)
|
|
{
|
|
struct xlog_in_core *first_iclog = log->l_iclog;
|
|
struct xlog_in_core *iclog = first_iclog;
|
|
bool ran_callback = false;
|
|
|
|
do {
|
|
LIST_HEAD(cb_list);
|
|
|
|
if (xlog_state_iodone_process_iclog(log, iclog))
|
|
break;
|
|
if (iclog->ic_state != XLOG_STATE_CALLBACK) {
|
|
iclog = iclog->ic_next;
|
|
continue;
|
|
}
|
|
list_splice_init(&iclog->ic_callbacks, &cb_list);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
trace_xlog_iclog_callbacks_start(iclog, _RET_IP_);
|
|
xlog_cil_process_committed(&cb_list);
|
|
trace_xlog_iclog_callbacks_done(iclog, _RET_IP_);
|
|
ran_callback = true;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
xlog_state_clean_iclog(log, iclog);
|
|
iclog = iclog->ic_next;
|
|
} while (iclog != first_iclog);
|
|
|
|
return ran_callback;
|
|
}
|
|
|
|
|
|
/*
|
|
* Loop running iclog completion callbacks until there are no more iclogs in a
|
|
* state that can run callbacks.
|
|
*/
|
|
STATIC void
|
|
xlog_state_do_callback(
|
|
struct xlog *log)
|
|
{
|
|
int flushcnt = 0;
|
|
int repeats = 0;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
while (xlog_state_do_iclog_callbacks(log)) {
|
|
if (xlog_is_shutdown(log))
|
|
break;
|
|
|
|
if (++repeats > 5000) {
|
|
flushcnt += repeats;
|
|
repeats = 0;
|
|
xfs_warn(log->l_mp,
|
|
"%s: possible infinite loop (%d iterations)",
|
|
__func__, flushcnt);
|
|
}
|
|
}
|
|
|
|
if (log->l_iclog->ic_state == XLOG_STATE_ACTIVE)
|
|
wake_up_all(&log->l_flush_wait);
|
|
|
|
spin_unlock(&log->l_icloglock);
|
|
}
|
|
|
|
|
|
/*
|
|
* Finish transitioning this iclog to the dirty state.
|
|
*
|
|
* Callbacks could take time, so they are done outside the scope of the
|
|
* global state machine log lock.
|
|
*/
|
|
STATIC void
|
|
xlog_state_done_syncing(
|
|
struct xlog_in_core *iclog)
|
|
{
|
|
struct xlog *log = iclog->ic_log;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
|
|
trace_xlog_iclog_sync_done(iclog, _RET_IP_);
|
|
|
|
/*
|
|
* If we got an error, either on the first buffer, or in the case of
|
|
* split log writes, on the second, we shut down the file system and
|
|
* no iclogs should ever be attempted to be written to disk again.
|
|
*/
|
|
if (!xlog_is_shutdown(log)) {
|
|
ASSERT(iclog->ic_state == XLOG_STATE_SYNCING);
|
|
iclog->ic_state = XLOG_STATE_DONE_SYNC;
|
|
}
|
|
|
|
/*
|
|
* Someone could be sleeping prior to writing out the next
|
|
* iclog buffer, we wake them all, one will get to do the
|
|
* I/O, the others get to wait for the result.
|
|
*/
|
|
wake_up_all(&iclog->ic_write_wait);
|
|
spin_unlock(&log->l_icloglock);
|
|
xlog_state_do_callback(log);
|
|
}
|
|
|
|
/*
|
|
* If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
|
|
* sleep. We wait on the flush queue on the head iclog as that should be
|
|
* the first iclog to complete flushing. Hence if all iclogs are syncing,
|
|
* we will wait here and all new writes will sleep until a sync completes.
|
|
*
|
|
* The in-core logs are used in a circular fashion. They are not used
|
|
* out-of-order even when an iclog past the head is free.
|
|
*
|
|
* return:
|
|
* * log_offset where xlog_write() can start writing into the in-core
|
|
* log's data space.
|
|
* * in-core log pointer to which xlog_write() should write.
|
|
* * boolean indicating this is a continued write to an in-core log.
|
|
* If this is the last write, then the in-core log's offset field
|
|
* needs to be incremented, depending on the amount of data which
|
|
* is copied.
|
|
*/
|
|
STATIC int
|
|
xlog_state_get_iclog_space(
|
|
struct xlog *log,
|
|
int len,
|
|
struct xlog_in_core **iclogp,
|
|
struct xlog_ticket *ticket,
|
|
int *logoffsetp)
|
|
{
|
|
int log_offset;
|
|
xlog_rec_header_t *head;
|
|
xlog_in_core_t *iclog;
|
|
|
|
restart:
|
|
spin_lock(&log->l_icloglock);
|
|
if (xlog_is_shutdown(log)) {
|
|
spin_unlock(&log->l_icloglock);
|
|
return -EIO;
|
|
}
|
|
|
|
iclog = log->l_iclog;
|
|
if (iclog->ic_state != XLOG_STATE_ACTIVE) {
|
|
XFS_STATS_INC(log->l_mp, xs_log_noiclogs);
|
|
|
|
/* Wait for log writes to have flushed */
|
|
xlog_wait(&log->l_flush_wait, &log->l_icloglock);
|
|
goto restart;
|
|
}
|
|
|
|
head = &iclog->ic_header;
|
|
|
|
atomic_inc(&iclog->ic_refcnt); /* prevents sync */
|
|
log_offset = iclog->ic_offset;
|
|
|
|
trace_xlog_iclog_get_space(iclog, _RET_IP_);
|
|
|
|
/* On the 1st write to an iclog, figure out lsn. This works
|
|
* if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
|
|
* committing to. If the offset is set, that's how many blocks
|
|
* must be written.
|
|
*/
|
|
if (log_offset == 0) {
|
|
ticket->t_curr_res -= log->l_iclog_hsize;
|
|
head->h_cycle = cpu_to_be32(log->l_curr_cycle);
|
|
head->h_lsn = cpu_to_be64(
|
|
xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block));
|
|
ASSERT(log->l_curr_block >= 0);
|
|
}
|
|
|
|
/* If there is enough room to write everything, then do it. Otherwise,
|
|
* claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
|
|
* bit is on, so this will get flushed out. Don't update ic_offset
|
|
* until you know exactly how many bytes get copied. Therefore, wait
|
|
* until later to update ic_offset.
|
|
*
|
|
* xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
|
|
* can fit into remaining data section.
|
|
*/
|
|
if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
|
|
int error = 0;
|
|
|
|
xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
|
|
|
|
/*
|
|
* If we are the only one writing to this iclog, sync it to
|
|
* disk. We need to do an atomic compare and decrement here to
|
|
* avoid racing with concurrent atomic_dec_and_lock() calls in
|
|
* xlog_state_release_iclog() when there is more than one
|
|
* reference to the iclog.
|
|
*/
|
|
if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1))
|
|
error = xlog_state_release_iclog(log, iclog, ticket);
|
|
spin_unlock(&log->l_icloglock);
|
|
if (error)
|
|
return error;
|
|
goto restart;
|
|
}
|
|
|
|
/* Do we have enough room to write the full amount in the remainder
|
|
* of this iclog? Or must we continue a write on the next iclog and
|
|
* mark this iclog as completely taken? In the case where we switch
|
|
* iclogs (to mark it taken), this particular iclog will release/sync
|
|
* to disk in xlog_write().
|
|
*/
|
|
if (len <= iclog->ic_size - iclog->ic_offset)
|
|
iclog->ic_offset += len;
|
|
else
|
|
xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
|
|
*iclogp = iclog;
|
|
|
|
ASSERT(iclog->ic_offset <= iclog->ic_size);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
*logoffsetp = log_offset;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The first cnt-1 times a ticket goes through here we don't need to move the
|
|
* grant write head because the permanent reservation has reserved cnt times the
|
|
* unit amount. Release part of current permanent unit reservation and reset
|
|
* current reservation to be one units worth. Also move grant reservation head
|
|
* forward.
|
|
*/
|
|
void
|
|
xfs_log_ticket_regrant(
|
|
struct xlog *log,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
trace_xfs_log_ticket_regrant(log, ticket);
|
|
|
|
if (ticket->t_cnt > 0)
|
|
ticket->t_cnt--;
|
|
|
|
xlog_grant_sub_space(log, &log->l_reserve_head.grant,
|
|
ticket->t_curr_res);
|
|
xlog_grant_sub_space(log, &log->l_write_head.grant,
|
|
ticket->t_curr_res);
|
|
ticket->t_curr_res = ticket->t_unit_res;
|
|
|
|
trace_xfs_log_ticket_regrant_sub(log, ticket);
|
|
|
|
/* just return if we still have some of the pre-reserved space */
|
|
if (!ticket->t_cnt) {
|
|
xlog_grant_add_space(log, &log->l_reserve_head.grant,
|
|
ticket->t_unit_res);
|
|
trace_xfs_log_ticket_regrant_exit(log, ticket);
|
|
|
|
ticket->t_curr_res = ticket->t_unit_res;
|
|
}
|
|
|
|
xfs_log_ticket_put(ticket);
|
|
}
|
|
|
|
/*
|
|
* Give back the space left from a reservation.
|
|
*
|
|
* All the information we need to make a correct determination of space left
|
|
* is present. For non-permanent reservations, things are quite easy. The
|
|
* count should have been decremented to zero. We only need to deal with the
|
|
* space remaining in the current reservation part of the ticket. If the
|
|
* ticket contains a permanent reservation, there may be left over space which
|
|
* needs to be released. A count of N means that N-1 refills of the current
|
|
* reservation can be done before we need to ask for more space. The first
|
|
* one goes to fill up the first current reservation. Once we run out of
|
|
* space, the count will stay at zero and the only space remaining will be
|
|
* in the current reservation field.
|
|
*/
|
|
void
|
|
xfs_log_ticket_ungrant(
|
|
struct xlog *log,
|
|
struct xlog_ticket *ticket)
|
|
{
|
|
int bytes;
|
|
|
|
trace_xfs_log_ticket_ungrant(log, ticket);
|
|
|
|
if (ticket->t_cnt > 0)
|
|
ticket->t_cnt--;
|
|
|
|
trace_xfs_log_ticket_ungrant_sub(log, ticket);
|
|
|
|
/*
|
|
* If this is a permanent reservation ticket, we may be able to free
|
|
* up more space based on the remaining count.
|
|
*/
|
|
bytes = ticket->t_curr_res;
|
|
if (ticket->t_cnt > 0) {
|
|
ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
|
|
bytes += ticket->t_unit_res*ticket->t_cnt;
|
|
}
|
|
|
|
xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes);
|
|
xlog_grant_sub_space(log, &log->l_write_head.grant, bytes);
|
|
|
|
trace_xfs_log_ticket_ungrant_exit(log, ticket);
|
|
|
|
xfs_log_space_wake(log->l_mp);
|
|
xfs_log_ticket_put(ticket);
|
|
}
|
|
|
|
/*
|
|
* This routine will mark the current iclog in the ring as WANT_SYNC and move
|
|
* the current iclog pointer to the next iclog in the ring.
|
|
*/
|
|
void
|
|
xlog_state_switch_iclogs(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
int eventual_size)
|
|
{
|
|
ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
|
|
assert_spin_locked(&log->l_icloglock);
|
|
trace_xlog_iclog_switch(iclog, _RET_IP_);
|
|
|
|
if (!eventual_size)
|
|
eventual_size = iclog->ic_offset;
|
|
iclog->ic_state = XLOG_STATE_WANT_SYNC;
|
|
iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block);
|
|
log->l_prev_block = log->l_curr_block;
|
|
log->l_prev_cycle = log->l_curr_cycle;
|
|
|
|
/* roll log?: ic_offset changed later */
|
|
log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
|
|
|
|
/* Round up to next log-sunit */
|
|
if (log->l_iclog_roundoff > BBSIZE) {
|
|
uint32_t sunit_bb = BTOBB(log->l_iclog_roundoff);
|
|
log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
|
|
}
|
|
|
|
if (log->l_curr_block >= log->l_logBBsize) {
|
|
/*
|
|
* Rewind the current block before the cycle is bumped to make
|
|
* sure that the combined LSN never transiently moves forward
|
|
* when the log wraps to the next cycle. This is to support the
|
|
* unlocked sample of these fields from xlog_valid_lsn(). Most
|
|
* other cases should acquire l_icloglock.
|
|
*/
|
|
log->l_curr_block -= log->l_logBBsize;
|
|
ASSERT(log->l_curr_block >= 0);
|
|
smp_wmb();
|
|
log->l_curr_cycle++;
|
|
if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
|
|
log->l_curr_cycle++;
|
|
}
|
|
ASSERT(iclog == log->l_iclog);
|
|
log->l_iclog = iclog->ic_next;
|
|
}
|
|
|
|
/*
|
|
* Force the iclog to disk and check if the iclog has been completed before
|
|
* xlog_force_iclog() returns. This can happen on synchronous (e.g.
|
|
* pmem) or fast async storage because we drop the icloglock to issue the IO.
|
|
* If completion has already occurred, tell the caller so that it can avoid an
|
|
* unnecessary wait on the iclog.
|
|
*/
|
|
static int
|
|
xlog_force_and_check_iclog(
|
|
struct xlog_in_core *iclog,
|
|
bool *completed)
|
|
{
|
|
xfs_lsn_t lsn = be64_to_cpu(iclog->ic_header.h_lsn);
|
|
int error;
|
|
|
|
*completed = false;
|
|
error = xlog_force_iclog(iclog);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If the iclog has already been completed and reused the header LSN
|
|
* will have been rewritten by completion
|
|
*/
|
|
if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn)
|
|
*completed = true;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write out all data in the in-core log as of this exact moment in time.
|
|
*
|
|
* Data may be written to the in-core log during this call. However,
|
|
* we don't guarantee this data will be written out. A change from past
|
|
* implementation means this routine will *not* write out zero length LRs.
|
|
*
|
|
* Basically, we try and perform an intelligent scan of the in-core logs.
|
|
* If we determine there is no flushable data, we just return. There is no
|
|
* flushable data if:
|
|
*
|
|
* 1. the current iclog is active and has no data; the previous iclog
|
|
* is in the active or dirty state.
|
|
* 2. the current iclog is drity, and the previous iclog is in the
|
|
* active or dirty state.
|
|
*
|
|
* We may sleep if:
|
|
*
|
|
* 1. the current iclog is not in the active nor dirty state.
|
|
* 2. the current iclog dirty, and the previous iclog is not in the
|
|
* active nor dirty state.
|
|
* 3. the current iclog is active, and there is another thread writing
|
|
* to this particular iclog.
|
|
* 4. a) the current iclog is active and has no other writers
|
|
* b) when we return from flushing out this iclog, it is still
|
|
* not in the active nor dirty state.
|
|
*/
|
|
int
|
|
xfs_log_force(
|
|
struct xfs_mount *mp,
|
|
uint flags)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
struct xlog_in_core *iclog;
|
|
|
|
XFS_STATS_INC(mp, xs_log_force);
|
|
trace_xfs_log_force(mp, 0, _RET_IP_);
|
|
|
|
xlog_cil_force(log);
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
if (xlog_is_shutdown(log))
|
|
goto out_error;
|
|
|
|
iclog = log->l_iclog;
|
|
trace_xlog_iclog_force(iclog, _RET_IP_);
|
|
|
|
if (iclog->ic_state == XLOG_STATE_DIRTY ||
|
|
(iclog->ic_state == XLOG_STATE_ACTIVE &&
|
|
atomic_read(&iclog->ic_refcnt) == 0 && iclog->ic_offset == 0)) {
|
|
/*
|
|
* If the head is dirty or (active and empty), then we need to
|
|
* look at the previous iclog.
|
|
*
|
|
* If the previous iclog is active or dirty we are done. There
|
|
* is nothing to sync out. Otherwise, we attach ourselves to the
|
|
* previous iclog and go to sleep.
|
|
*/
|
|
iclog = iclog->ic_prev;
|
|
} else if (iclog->ic_state == XLOG_STATE_ACTIVE) {
|
|
if (atomic_read(&iclog->ic_refcnt) == 0) {
|
|
/* We have exclusive access to this iclog. */
|
|
bool completed;
|
|
|
|
if (xlog_force_and_check_iclog(iclog, &completed))
|
|
goto out_error;
|
|
|
|
if (completed)
|
|
goto out_unlock;
|
|
} else {
|
|
/*
|
|
* Someone else is still writing to this iclog, so we
|
|
* need to ensure that when they release the iclog it
|
|
* gets synced immediately as we may be waiting on it.
|
|
*/
|
|
xlog_state_switch_iclogs(log, iclog, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The iclog we are about to wait on may contain the checkpoint pushed
|
|
* by the above xlog_cil_force() call, but it may not have been pushed
|
|
* to disk yet. Like the ACTIVE case above, we need to make sure caches
|
|
* are flushed when this iclog is written.
|
|
*/
|
|
if (iclog->ic_state == XLOG_STATE_WANT_SYNC)
|
|
iclog->ic_flags |= XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA;
|
|
|
|
if (flags & XFS_LOG_SYNC)
|
|
return xlog_wait_on_iclog(iclog);
|
|
out_unlock:
|
|
spin_unlock(&log->l_icloglock);
|
|
return 0;
|
|
out_error:
|
|
spin_unlock(&log->l_icloglock);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Force the log to a specific LSN.
|
|
*
|
|
* If an iclog with that lsn can be found:
|
|
* If it is in the DIRTY state, just return.
|
|
* If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
|
|
* state and go to sleep or return.
|
|
* If it is in any other state, go to sleep or return.
|
|
*
|
|
* Synchronous forces are implemented with a wait queue. All callers trying
|
|
* to force a given lsn to disk must wait on the queue attached to the
|
|
* specific in-core log. When given in-core log finally completes its write
|
|
* to disk, that thread will wake up all threads waiting on the queue.
|
|
*/
|
|
static int
|
|
xlog_force_lsn(
|
|
struct xlog *log,
|
|
xfs_lsn_t lsn,
|
|
uint flags,
|
|
int *log_flushed,
|
|
bool already_slept)
|
|
{
|
|
struct xlog_in_core *iclog;
|
|
bool completed;
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
if (xlog_is_shutdown(log))
|
|
goto out_error;
|
|
|
|
iclog = log->l_iclog;
|
|
while (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) {
|
|
trace_xlog_iclog_force_lsn(iclog, _RET_IP_);
|
|
iclog = iclog->ic_next;
|
|
if (iclog == log->l_iclog)
|
|
goto out_unlock;
|
|
}
|
|
|
|
switch (iclog->ic_state) {
|
|
case XLOG_STATE_ACTIVE:
|
|
/*
|
|
* We sleep here if we haven't already slept (e.g. this is the
|
|
* first time we've looked at the correct iclog buf) and the
|
|
* buffer before us is going to be sync'ed. The reason for this
|
|
* is that if we are doing sync transactions here, by waiting
|
|
* for the previous I/O to complete, we can allow a few more
|
|
* transactions into this iclog before we close it down.
|
|
*
|
|
* Otherwise, we mark the buffer WANT_SYNC, and bump up the
|
|
* refcnt so we can release the log (which drops the ref count).
|
|
* The state switch keeps new transaction commits from using
|
|
* this buffer. When the current commits finish writing into
|
|
* the buffer, the refcount will drop to zero and the buffer
|
|
* will go out then.
|
|
*/
|
|
if (!already_slept &&
|
|
(iclog->ic_prev->ic_state == XLOG_STATE_WANT_SYNC ||
|
|
iclog->ic_prev->ic_state == XLOG_STATE_SYNCING)) {
|
|
xlog_wait(&iclog->ic_prev->ic_write_wait,
|
|
&log->l_icloglock);
|
|
return -EAGAIN;
|
|
}
|
|
if (xlog_force_and_check_iclog(iclog, &completed))
|
|
goto out_error;
|
|
if (log_flushed)
|
|
*log_flushed = 1;
|
|
if (completed)
|
|
goto out_unlock;
|
|
break;
|
|
case XLOG_STATE_WANT_SYNC:
|
|
/*
|
|
* This iclog may contain the checkpoint pushed by the
|
|
* xlog_cil_force_seq() call, but there are other writers still
|
|
* accessing it so it hasn't been pushed to disk yet. Like the
|
|
* ACTIVE case above, we need to make sure caches are flushed
|
|
* when this iclog is written.
|
|
*/
|
|
iclog->ic_flags |= XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA;
|
|
break;
|
|
default:
|
|
/*
|
|
* The entire checkpoint was written by the CIL force and is on
|
|
* its way to disk already. It will be stable when it
|
|
* completes, so we don't need to manipulate caches here at all.
|
|
* We just need to wait for completion if necessary.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (flags & XFS_LOG_SYNC)
|
|
return xlog_wait_on_iclog(iclog);
|
|
out_unlock:
|
|
spin_unlock(&log->l_icloglock);
|
|
return 0;
|
|
out_error:
|
|
spin_unlock(&log->l_icloglock);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Force the log to a specific checkpoint sequence.
|
|
*
|
|
* First force the CIL so that all the required changes have been flushed to the
|
|
* iclogs. If the CIL force completed it will return a commit LSN that indicates
|
|
* the iclog that needs to be flushed to stable storage. If the caller needs
|
|
* a synchronous log force, we will wait on the iclog with the LSN returned by
|
|
* xlog_cil_force_seq() to be completed.
|
|
*/
|
|
int
|
|
xfs_log_force_seq(
|
|
struct xfs_mount *mp,
|
|
xfs_csn_t seq,
|
|
uint flags,
|
|
int *log_flushed)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
xfs_lsn_t lsn;
|
|
int ret;
|
|
ASSERT(seq != 0);
|
|
|
|
XFS_STATS_INC(mp, xs_log_force);
|
|
trace_xfs_log_force(mp, seq, _RET_IP_);
|
|
|
|
lsn = xlog_cil_force_seq(log, seq);
|
|
if (lsn == NULLCOMMITLSN)
|
|
return 0;
|
|
|
|
ret = xlog_force_lsn(log, lsn, flags, log_flushed, false);
|
|
if (ret == -EAGAIN) {
|
|
XFS_STATS_INC(mp, xs_log_force_sleep);
|
|
ret = xlog_force_lsn(log, lsn, flags, log_flushed, true);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Free a used ticket when its refcount falls to zero.
|
|
*/
|
|
void
|
|
xfs_log_ticket_put(
|
|
xlog_ticket_t *ticket)
|
|
{
|
|
ASSERT(atomic_read(&ticket->t_ref) > 0);
|
|
if (atomic_dec_and_test(&ticket->t_ref))
|
|
kmem_cache_free(xfs_log_ticket_cache, ticket);
|
|
}
|
|
|
|
xlog_ticket_t *
|
|
xfs_log_ticket_get(
|
|
xlog_ticket_t *ticket)
|
|
{
|
|
ASSERT(atomic_read(&ticket->t_ref) > 0);
|
|
atomic_inc(&ticket->t_ref);
|
|
return ticket;
|
|
}
|
|
|
|
/*
|
|
* Figure out the total log space unit (in bytes) that would be
|
|
* required for a log ticket.
|
|
*/
|
|
static int
|
|
xlog_calc_unit_res(
|
|
struct xlog *log,
|
|
int unit_bytes,
|
|
int *niclogs)
|
|
{
|
|
int iclog_space;
|
|
uint num_headers;
|
|
|
|
/*
|
|
* Permanent reservations have up to 'cnt'-1 active log operations
|
|
* in the log. A unit in this case is the amount of space for one
|
|
* of these log operations. Normal reservations have a cnt of 1
|
|
* and their unit amount is the total amount of space required.
|
|
*
|
|
* The following lines of code account for non-transaction data
|
|
* which occupy space in the on-disk log.
|
|
*
|
|
* Normal form of a transaction is:
|
|
* <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
|
|
* and then there are LR hdrs, split-recs and roundoff at end of syncs.
|
|
*
|
|
* We need to account for all the leadup data and trailer data
|
|
* around the transaction data.
|
|
* And then we need to account for the worst case in terms of using
|
|
* more space.
|
|
* The worst case will happen if:
|
|
* - the placement of the transaction happens to be such that the
|
|
* roundoff is at its maximum
|
|
* - the transaction data is synced before the commit record is synced
|
|
* i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
|
|
* Therefore the commit record is in its own Log Record.
|
|
* This can happen as the commit record is called with its
|
|
* own region to xlog_write().
|
|
* This then means that in the worst case, roundoff can happen for
|
|
* the commit-rec as well.
|
|
* The commit-rec is smaller than padding in this scenario and so it is
|
|
* not added separately.
|
|
*/
|
|
|
|
/* for trans header */
|
|
unit_bytes += sizeof(xlog_op_header_t);
|
|
unit_bytes += sizeof(xfs_trans_header_t);
|
|
|
|
/* for start-rec */
|
|
unit_bytes += sizeof(xlog_op_header_t);
|
|
|
|
/*
|
|
* for LR headers - the space for data in an iclog is the size minus
|
|
* the space used for the headers. If we use the iclog size, then we
|
|
* undercalculate the number of headers required.
|
|
*
|
|
* Furthermore - the addition of op headers for split-recs might
|
|
* increase the space required enough to require more log and op
|
|
* headers, so take that into account too.
|
|
*
|
|
* IMPORTANT: This reservation makes the assumption that if this
|
|
* transaction is the first in an iclog and hence has the LR headers
|
|
* accounted to it, then the remaining space in the iclog is
|
|
* exclusively for this transaction. i.e. if the transaction is larger
|
|
* than the iclog, it will be the only thing in that iclog.
|
|
* Fundamentally, this means we must pass the entire log vector to
|
|
* xlog_write to guarantee this.
|
|
*/
|
|
iclog_space = log->l_iclog_size - log->l_iclog_hsize;
|
|
num_headers = howmany(unit_bytes, iclog_space);
|
|
|
|
/* for split-recs - ophdrs added when data split over LRs */
|
|
unit_bytes += sizeof(xlog_op_header_t) * num_headers;
|
|
|
|
/* add extra header reservations if we overrun */
|
|
while (!num_headers ||
|
|
howmany(unit_bytes, iclog_space) > num_headers) {
|
|
unit_bytes += sizeof(xlog_op_header_t);
|
|
num_headers++;
|
|
}
|
|
unit_bytes += log->l_iclog_hsize * num_headers;
|
|
|
|
/* for commit-rec LR header - note: padding will subsume the ophdr */
|
|
unit_bytes += log->l_iclog_hsize;
|
|
|
|
/* roundoff padding for transaction data and one for commit record */
|
|
unit_bytes += 2 * log->l_iclog_roundoff;
|
|
|
|
if (niclogs)
|
|
*niclogs = num_headers;
|
|
return unit_bytes;
|
|
}
|
|
|
|
int
|
|
xfs_log_calc_unit_res(
|
|
struct xfs_mount *mp,
|
|
int unit_bytes)
|
|
{
|
|
return xlog_calc_unit_res(mp->m_log, unit_bytes, NULL);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialise a new log ticket.
|
|
*/
|
|
struct xlog_ticket *
|
|
xlog_ticket_alloc(
|
|
struct xlog *log,
|
|
int unit_bytes,
|
|
int cnt,
|
|
bool permanent)
|
|
{
|
|
struct xlog_ticket *tic;
|
|
int unit_res;
|
|
|
|
tic = kmem_cache_zalloc(xfs_log_ticket_cache, GFP_NOFS | __GFP_NOFAIL);
|
|
|
|
unit_res = xlog_calc_unit_res(log, unit_bytes, &tic->t_iclog_hdrs);
|
|
|
|
atomic_set(&tic->t_ref, 1);
|
|
tic->t_task = current;
|
|
INIT_LIST_HEAD(&tic->t_queue);
|
|
tic->t_unit_res = unit_res;
|
|
tic->t_curr_res = unit_res;
|
|
tic->t_cnt = cnt;
|
|
tic->t_ocnt = cnt;
|
|
tic->t_tid = get_random_u32();
|
|
if (permanent)
|
|
tic->t_flags |= XLOG_TIC_PERM_RESERV;
|
|
|
|
return tic;
|
|
}
|
|
|
|
#if defined(DEBUG)
|
|
/*
|
|
* Check to make sure the grant write head didn't just over lap the tail. If
|
|
* the cycles are the same, we can't be overlapping. Otherwise, make sure that
|
|
* the cycles differ by exactly one and check the byte count.
|
|
*
|
|
* This check is run unlocked, so can give false positives. Rather than assert
|
|
* on failures, use a warn-once flag and a panic tag to allow the admin to
|
|
* determine if they want to panic the machine when such an error occurs. For
|
|
* debug kernels this will have the same effect as using an assert but, unlinke
|
|
* an assert, it can be turned off at runtime.
|
|
*/
|
|
STATIC void
|
|
xlog_verify_grant_tail(
|
|
struct xlog *log)
|
|
{
|
|
int tail_cycle, tail_blocks;
|
|
int cycle, space;
|
|
|
|
xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space);
|
|
xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks);
|
|
if (tail_cycle != cycle) {
|
|
if (cycle - 1 != tail_cycle &&
|
|
!test_and_set_bit(XLOG_TAIL_WARN, &log->l_opstate)) {
|
|
xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
|
|
"%s: cycle - 1 != tail_cycle", __func__);
|
|
}
|
|
|
|
if (space > BBTOB(tail_blocks) &&
|
|
!test_and_set_bit(XLOG_TAIL_WARN, &log->l_opstate)) {
|
|
xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
|
|
"%s: space > BBTOB(tail_blocks)", __func__);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* check if it will fit */
|
|
STATIC void
|
|
xlog_verify_tail_lsn(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog)
|
|
{
|
|
xfs_lsn_t tail_lsn = be64_to_cpu(iclog->ic_header.h_tail_lsn);
|
|
int blocks;
|
|
|
|
if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
|
|
blocks =
|
|
log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
|
|
if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
|
|
xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
|
|
} else {
|
|
ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
|
|
|
|
if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
|
|
xfs_emerg(log->l_mp, "%s: tail wrapped", __func__);
|
|
|
|
blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
|
|
if (blocks < BTOBB(iclog->ic_offset) + 1)
|
|
xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform a number of checks on the iclog before writing to disk.
|
|
*
|
|
* 1. Make sure the iclogs are still circular
|
|
* 2. Make sure we have a good magic number
|
|
* 3. Make sure we don't have magic numbers in the data
|
|
* 4. Check fields of each log operation header for:
|
|
* A. Valid client identifier
|
|
* B. tid ptr value falls in valid ptr space (user space code)
|
|
* C. Length in log record header is correct according to the
|
|
* individual operation headers within record.
|
|
* 5. When a bwrite will occur within 5 blocks of the front of the physical
|
|
* log, check the preceding blocks of the physical log to make sure all
|
|
* the cycle numbers agree with the current cycle number.
|
|
*/
|
|
STATIC void
|
|
xlog_verify_iclog(
|
|
struct xlog *log,
|
|
struct xlog_in_core *iclog,
|
|
int count)
|
|
{
|
|
xlog_op_header_t *ophead;
|
|
xlog_in_core_t *icptr;
|
|
xlog_in_core_2_t *xhdr;
|
|
void *base_ptr, *ptr, *p;
|
|
ptrdiff_t field_offset;
|
|
uint8_t clientid;
|
|
int len, i, j, k, op_len;
|
|
int idx;
|
|
|
|
/* check validity of iclog pointers */
|
|
spin_lock(&log->l_icloglock);
|
|
icptr = log->l_iclog;
|
|
for (i = 0; i < log->l_iclog_bufs; i++, icptr = icptr->ic_next)
|
|
ASSERT(icptr);
|
|
|
|
if (icptr != log->l_iclog)
|
|
xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
/* check log magic numbers */
|
|
if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
|
|
xfs_emerg(log->l_mp, "%s: invalid magic num", __func__);
|
|
|
|
base_ptr = ptr = &iclog->ic_header;
|
|
p = &iclog->ic_header;
|
|
for (ptr += BBSIZE; ptr < base_ptr + count; ptr += BBSIZE) {
|
|
if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
|
|
xfs_emerg(log->l_mp, "%s: unexpected magic num",
|
|
__func__);
|
|
}
|
|
|
|
/* check fields */
|
|
len = be32_to_cpu(iclog->ic_header.h_num_logops);
|
|
base_ptr = ptr = iclog->ic_datap;
|
|
ophead = ptr;
|
|
xhdr = iclog->ic_data;
|
|
for (i = 0; i < len; i++) {
|
|
ophead = ptr;
|
|
|
|
/* clientid is only 1 byte */
|
|
p = &ophead->oh_clientid;
|
|
field_offset = p - base_ptr;
|
|
if (field_offset & 0x1ff) {
|
|
clientid = ophead->oh_clientid;
|
|
} else {
|
|
idx = BTOBBT((void *)&ophead->oh_clientid - iclog->ic_datap);
|
|
if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
|
|
j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
clientid = xlog_get_client_id(
|
|
xhdr[j].hic_xheader.xh_cycle_data[k]);
|
|
} else {
|
|
clientid = xlog_get_client_id(
|
|
iclog->ic_header.h_cycle_data[idx]);
|
|
}
|
|
}
|
|
if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) {
|
|
xfs_warn(log->l_mp,
|
|
"%s: op %d invalid clientid %d op "PTR_FMT" offset 0x%lx",
|
|
__func__, i, clientid, ophead,
|
|
(unsigned long)field_offset);
|
|
}
|
|
|
|
/* check length */
|
|
p = &ophead->oh_len;
|
|
field_offset = p - base_ptr;
|
|
if (field_offset & 0x1ff) {
|
|
op_len = be32_to_cpu(ophead->oh_len);
|
|
} else {
|
|
idx = BTOBBT((void *)&ophead->oh_len - iclog->ic_datap);
|
|
if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
|
|
j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]);
|
|
} else {
|
|
op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]);
|
|
}
|
|
}
|
|
ptr += sizeof(xlog_op_header_t) + op_len;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Perform a forced shutdown on the log.
|
|
*
|
|
* This can be called from low level log code to trigger a shutdown, or from the
|
|
* high level mount shutdown code when the mount shuts down.
|
|
*
|
|
* Our main objectives here are to make sure that:
|
|
* a. if the shutdown was not due to a log IO error, flush the logs to
|
|
* disk. Anything modified after this is ignored.
|
|
* b. the log gets atomically marked 'XLOG_IO_ERROR' for all interested
|
|
* parties to find out. Nothing new gets queued after this is done.
|
|
* c. Tasks sleeping on log reservations, pinned objects and
|
|
* other resources get woken up.
|
|
* d. The mount is also marked as shut down so that log triggered shutdowns
|
|
* still behave the same as if they called xfs_forced_shutdown().
|
|
*
|
|
* Return true if the shutdown cause was a log IO error and we actually shut the
|
|
* log down.
|
|
*/
|
|
bool
|
|
xlog_force_shutdown(
|
|
struct xlog *log,
|
|
uint32_t shutdown_flags)
|
|
{
|
|
bool log_error = (shutdown_flags & SHUTDOWN_LOG_IO_ERROR);
|
|
|
|
if (!log)
|
|
return false;
|
|
|
|
/*
|
|
* Flush all the completed transactions to disk before marking the log
|
|
* being shut down. We need to do this first as shutting down the log
|
|
* before the force will prevent the log force from flushing the iclogs
|
|
* to disk.
|
|
*
|
|
* When we are in recovery, there are no transactions to flush, and
|
|
* we don't want to touch the log because we don't want to perturb the
|
|
* current head/tail for future recovery attempts. Hence we need to
|
|
* avoid a log force in this case.
|
|
*
|
|
* If we are shutting down due to a log IO error, then we must avoid
|
|
* trying to write the log as that may just result in more IO errors and
|
|
* an endless shutdown/force loop.
|
|
*/
|
|
if (!log_error && !xlog_in_recovery(log))
|
|
xfs_log_force(log->l_mp, XFS_LOG_SYNC);
|
|
|
|
/*
|
|
* Atomically set the shutdown state. If the shutdown state is already
|
|
* set, there someone else is performing the shutdown and so we are done
|
|
* here. This should never happen because we should only ever get called
|
|
* once by the first shutdown caller.
|
|
*
|
|
* Much of the log state machine transitions assume that shutdown state
|
|
* cannot change once they hold the log->l_icloglock. Hence we need to
|
|
* hold that lock here, even though we use the atomic test_and_set_bit()
|
|
* operation to set the shutdown state.
|
|
*/
|
|
spin_lock(&log->l_icloglock);
|
|
if (test_and_set_bit(XLOG_IO_ERROR, &log->l_opstate)) {
|
|
spin_unlock(&log->l_icloglock);
|
|
return false;
|
|
}
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
/*
|
|
* If this log shutdown also sets the mount shutdown state, issue a
|
|
* shutdown warning message.
|
|
*/
|
|
if (!test_and_set_bit(XFS_OPSTATE_SHUTDOWN, &log->l_mp->m_opstate)) {
|
|
xfs_alert_tag(log->l_mp, XFS_PTAG_SHUTDOWN_LOGERROR,
|
|
"Filesystem has been shut down due to log error (0x%x).",
|
|
shutdown_flags);
|
|
xfs_alert(log->l_mp,
|
|
"Please unmount the filesystem and rectify the problem(s).");
|
|
if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
|
|
xfs_stack_trace();
|
|
}
|
|
|
|
/*
|
|
* We don't want anybody waiting for log reservations after this. That
|
|
* means we have to wake up everybody queued up on reserveq as well as
|
|
* writeq. In addition, we make sure in xlog_{re}grant_log_space that
|
|
* we don't enqueue anything once the SHUTDOWN flag is set, and this
|
|
* action is protected by the grant locks.
|
|
*/
|
|
xlog_grant_head_wake_all(&log->l_reserve_head);
|
|
xlog_grant_head_wake_all(&log->l_write_head);
|
|
|
|
/*
|
|
* Wake up everybody waiting on xfs_log_force. Wake the CIL push first
|
|
* as if the log writes were completed. The abort handling in the log
|
|
* item committed callback functions will do this again under lock to
|
|
* avoid races.
|
|
*/
|
|
spin_lock(&log->l_cilp->xc_push_lock);
|
|
wake_up_all(&log->l_cilp->xc_start_wait);
|
|
wake_up_all(&log->l_cilp->xc_commit_wait);
|
|
spin_unlock(&log->l_cilp->xc_push_lock);
|
|
|
|
spin_lock(&log->l_icloglock);
|
|
xlog_state_shutdown_callbacks(log);
|
|
spin_unlock(&log->l_icloglock);
|
|
|
|
wake_up_var(&log->l_opstate);
|
|
return log_error;
|
|
}
|
|
|
|
STATIC int
|
|
xlog_iclogs_empty(
|
|
struct xlog *log)
|
|
{
|
|
xlog_in_core_t *iclog;
|
|
|
|
iclog = log->l_iclog;
|
|
do {
|
|
/* endianness does not matter here, zero is zero in
|
|
* any language.
|
|
*/
|
|
if (iclog->ic_header.h_num_logops)
|
|
return 0;
|
|
iclog = iclog->ic_next;
|
|
} while (iclog != log->l_iclog);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Verify that an LSN stamped into a piece of metadata is valid. This is
|
|
* intended for use in read verifiers on v5 superblocks.
|
|
*/
|
|
bool
|
|
xfs_log_check_lsn(
|
|
struct xfs_mount *mp,
|
|
xfs_lsn_t lsn)
|
|
{
|
|
struct xlog *log = mp->m_log;
|
|
bool valid;
|
|
|
|
/*
|
|
* norecovery mode skips mount-time log processing and unconditionally
|
|
* resets the in-core LSN. We can't validate in this mode, but
|
|
* modifications are not allowed anyways so just return true.
|
|
*/
|
|
if (xfs_has_norecovery(mp))
|
|
return true;
|
|
|
|
/*
|
|
* Some metadata LSNs are initialized to NULL (e.g., the agfl). This is
|
|
* handled by recovery and thus safe to ignore here.
|
|
*/
|
|
if (lsn == NULLCOMMITLSN)
|
|
return true;
|
|
|
|
valid = xlog_valid_lsn(mp->m_log, lsn);
|
|
|
|
/* warn the user about what's gone wrong before verifier failure */
|
|
if (!valid) {
|
|
spin_lock(&log->l_icloglock);
|
|
xfs_warn(mp,
|
|
"Corruption warning: Metadata has LSN (%d:%d) ahead of current LSN (%d:%d). "
|
|
"Please unmount and run xfs_repair (>= v4.3) to resolve.",
|
|
CYCLE_LSN(lsn), BLOCK_LSN(lsn),
|
|
log->l_curr_cycle, log->l_curr_block);
|
|
spin_unlock(&log->l_icloglock);
|
|
}
|
|
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Notify the log that we're about to start using a feature that is protected
|
|
* by a log incompat feature flag. This will prevent log covering from
|
|
* clearing those flags.
|
|
*/
|
|
void
|
|
xlog_use_incompat_feat(
|
|
struct xlog *log)
|
|
{
|
|
down_read(&log->l_incompat_users);
|
|
}
|
|
|
|
/* Notify the log that we've finished using log incompat features. */
|
|
void
|
|
xlog_drop_incompat_feat(
|
|
struct xlog *log)
|
|
{
|
|
up_read(&log->l_incompat_users);
|
|
}
|