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![David Chinner](/assets/img/avatar_default.png)
Change all the remaining AIL API functions that are passed struct xfs_mount pointers to pass pointers directly to the struct xfs_ail being used. With this conversion, all external access to the AIL is via the struct xfs_ail. Hence the operation and referencing of the AIL is almost entirely independent of the xfs_mount that is using it - it is now much more tightly tied to the log and the items it is tracking in the log than it is tied to the xfs_mount. SGI-PV: 988143 SGI-Modid: xfs-linux-melb:xfs-kern:32353a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
1175 lines
32 KiB
C
1175 lines
32 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_buf_item.h"
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#include "xfs_trans_priv.h"
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#include "xfs_error.h"
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kmem_zone_t *xfs_buf_item_zone;
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#ifdef XFS_TRANS_DEBUG
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/*
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* This function uses an alternate strategy for tracking the bytes
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* that the user requests to be logged. This can then be used
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* in conjunction with the bli_orig array in the buf log item to
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* catch bugs in our callers' code.
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*
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* We also double check the bits set in xfs_buf_item_log using a
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* simple algorithm to check that every byte is accounted for.
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*/
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STATIC void
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xfs_buf_item_log_debug(
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xfs_buf_log_item_t *bip,
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uint first,
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uint last)
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{
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uint x;
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uint byte;
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uint nbytes;
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uint chunk_num;
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uint word_num;
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uint bit_num;
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uint bit_set;
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uint *wordp;
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ASSERT(bip->bli_logged != NULL);
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byte = first;
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nbytes = last - first + 1;
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bfset(bip->bli_logged, first, nbytes);
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for (x = 0; x < nbytes; x++) {
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chunk_num = byte >> XFS_BLI_SHIFT;
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word_num = chunk_num >> BIT_TO_WORD_SHIFT;
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bit_num = chunk_num & (NBWORD - 1);
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wordp = &(bip->bli_format.blf_data_map[word_num]);
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bit_set = *wordp & (1 << bit_num);
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ASSERT(bit_set);
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byte++;
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}
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}
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/*
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* This function is called when we flush something into a buffer without
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* logging it. This happens for things like inodes which are logged
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* separately from the buffer.
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*/
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void
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xfs_buf_item_flush_log_debug(
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xfs_buf_t *bp,
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uint first,
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uint last)
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{
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xfs_buf_log_item_t *bip;
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uint nbytes;
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bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*);
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if ((bip == NULL) || (bip->bli_item.li_type != XFS_LI_BUF)) {
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return;
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}
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ASSERT(bip->bli_logged != NULL);
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nbytes = last - first + 1;
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bfset(bip->bli_logged, first, nbytes);
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}
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/*
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* This function is called to verify that our callers have logged
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* all the bytes that they changed.
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*
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* It does this by comparing the original copy of the buffer stored in
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* the buf log item's bli_orig array to the current copy of the buffer
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* and ensuring that all bytes which mismatch are set in the bli_logged
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* array of the buf log item.
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*/
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STATIC void
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xfs_buf_item_log_check(
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xfs_buf_log_item_t *bip)
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{
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char *orig;
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char *buffer;
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int x;
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xfs_buf_t *bp;
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ASSERT(bip->bli_orig != NULL);
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ASSERT(bip->bli_logged != NULL);
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bp = bip->bli_buf;
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ASSERT(XFS_BUF_COUNT(bp) > 0);
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ASSERT(XFS_BUF_PTR(bp) != NULL);
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orig = bip->bli_orig;
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buffer = XFS_BUF_PTR(bp);
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for (x = 0; x < XFS_BUF_COUNT(bp); x++) {
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if (orig[x] != buffer[x] && !btst(bip->bli_logged, x))
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cmn_err(CE_PANIC,
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"xfs_buf_item_log_check bip %x buffer %x orig %x index %d",
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bip, bp, orig, x);
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}
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}
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#else
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#define xfs_buf_item_log_debug(x,y,z)
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#define xfs_buf_item_log_check(x)
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#endif
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STATIC void xfs_buf_error_relse(xfs_buf_t *bp);
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STATIC void xfs_buf_do_callbacks(xfs_buf_t *bp, xfs_log_item_t *lip);
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/*
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* This returns the number of log iovecs needed to log the
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* given buf log item.
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*
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* It calculates this as 1 iovec for the buf log format structure
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* and 1 for each stretch of non-contiguous chunks to be logged.
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* Contiguous chunks are logged in a single iovec.
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*
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* If the XFS_BLI_STALE flag has been set, then log nothing.
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*/
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STATIC uint
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xfs_buf_item_size(
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xfs_buf_log_item_t *bip)
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{
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uint nvecs;
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int next_bit;
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int last_bit;
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xfs_buf_t *bp;
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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if (bip->bli_flags & XFS_BLI_STALE) {
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/*
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* The buffer is stale, so all we need to log
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* is the buf log format structure with the
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* cancel flag in it.
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*/
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xfs_buf_item_trace("SIZE STALE", bip);
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ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL);
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return 1;
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}
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bp = bip->bli_buf;
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ASSERT(bip->bli_flags & XFS_BLI_LOGGED);
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nvecs = 1;
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last_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size, 0);
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ASSERT(last_bit != -1);
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nvecs++;
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while (last_bit != -1) {
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/*
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* This takes the bit number to start looking from and
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* returns the next set bit from there. It returns -1
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* if there are no more bits set or the start bit is
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* beyond the end of the bitmap.
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*/
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next_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size,
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last_bit + 1);
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/*
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* If we run out of bits, leave the loop,
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* else if we find a new set of bits bump the number of vecs,
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* else keep scanning the current set of bits.
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*/
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if (next_bit == -1) {
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last_bit = -1;
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} else if (next_bit != last_bit + 1) {
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last_bit = next_bit;
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nvecs++;
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} else if (xfs_buf_offset(bp, next_bit * XFS_BLI_CHUNK) !=
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(xfs_buf_offset(bp, last_bit * XFS_BLI_CHUNK) +
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XFS_BLI_CHUNK)) {
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last_bit = next_bit;
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nvecs++;
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} else {
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last_bit++;
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}
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}
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xfs_buf_item_trace("SIZE NORM", bip);
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return nvecs;
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}
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/*
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* This is called to fill in the vector of log iovecs for the
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* given log buf item. It fills the first entry with a buf log
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* format structure, and the rest point to contiguous chunks
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* within the buffer.
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*/
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STATIC void
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xfs_buf_item_format(
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xfs_buf_log_item_t *bip,
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xfs_log_iovec_t *log_vector)
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{
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uint base_size;
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uint nvecs;
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xfs_log_iovec_t *vecp;
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xfs_buf_t *bp;
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int first_bit;
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int last_bit;
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int next_bit;
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uint nbits;
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uint buffer_offset;
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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ASSERT((bip->bli_flags & XFS_BLI_LOGGED) ||
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(bip->bli_flags & XFS_BLI_STALE));
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bp = bip->bli_buf;
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vecp = log_vector;
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/*
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* The size of the base structure is the size of the
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* declared structure plus the space for the extra words
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* of the bitmap. We subtract one from the map size, because
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* the first element of the bitmap is accounted for in the
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* size of the base structure.
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*/
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base_size =
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(uint)(sizeof(xfs_buf_log_format_t) +
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((bip->bli_format.blf_map_size - 1) * sizeof(uint)));
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vecp->i_addr = (xfs_caddr_t)&bip->bli_format;
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vecp->i_len = base_size;
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XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BFORMAT);
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vecp++;
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nvecs = 1;
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if (bip->bli_flags & XFS_BLI_STALE) {
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/*
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* The buffer is stale, so all we need to log
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* is the buf log format structure with the
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* cancel flag in it.
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*/
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xfs_buf_item_trace("FORMAT STALE", bip);
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ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL);
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bip->bli_format.blf_size = nvecs;
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return;
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}
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/*
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* Fill in an iovec for each set of contiguous chunks.
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*/
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first_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size, 0);
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ASSERT(first_bit != -1);
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last_bit = first_bit;
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nbits = 1;
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for (;;) {
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/*
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* This takes the bit number to start looking from and
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* returns the next set bit from there. It returns -1
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* if there are no more bits set or the start bit is
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* beyond the end of the bitmap.
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*/
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next_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size,
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(uint)last_bit + 1);
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/*
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* If we run out of bits fill in the last iovec and get
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* out of the loop.
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* Else if we start a new set of bits then fill in the
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* iovec for the series we were looking at and start
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* counting the bits in the new one.
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* Else we're still in the same set of bits so just
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* keep counting and scanning.
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*/
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if (next_bit == -1) {
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buffer_offset = first_bit * XFS_BLI_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLI_CHUNK;
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XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK);
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nvecs++;
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break;
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} else if (next_bit != last_bit + 1) {
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buffer_offset = first_bit * XFS_BLI_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLI_CHUNK;
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XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK);
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nvecs++;
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vecp++;
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first_bit = next_bit;
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last_bit = next_bit;
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nbits = 1;
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} else if (xfs_buf_offset(bp, next_bit << XFS_BLI_SHIFT) !=
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(xfs_buf_offset(bp, last_bit << XFS_BLI_SHIFT) +
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XFS_BLI_CHUNK)) {
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buffer_offset = first_bit * XFS_BLI_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLI_CHUNK;
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XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK);
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/* You would think we need to bump the nvecs here too, but we do not
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* this number is used by recovery, and it gets confused by the boundary
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* split here
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* nvecs++;
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*/
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vecp++;
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first_bit = next_bit;
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last_bit = next_bit;
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nbits = 1;
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} else {
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last_bit++;
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nbits++;
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}
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}
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bip->bli_format.blf_size = nvecs;
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/*
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* Check to make sure everything is consistent.
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*/
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xfs_buf_item_trace("FORMAT NORM", bip);
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xfs_buf_item_log_check(bip);
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}
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/*
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* This is called to pin the buffer associated with the buf log
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* item in memory so it cannot be written out. Simply call bpin()
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* on the buffer to do this.
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*/
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STATIC void
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xfs_buf_item_pin(
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xfs_buf_log_item_t *bip)
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{
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xfs_buf_t *bp;
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bp = bip->bli_buf;
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ASSERT(XFS_BUF_ISBUSY(bp));
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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ASSERT((bip->bli_flags & XFS_BLI_LOGGED) ||
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(bip->bli_flags & XFS_BLI_STALE));
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xfs_buf_item_trace("PIN", bip);
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xfs_buftrace("XFS_PIN", bp);
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xfs_bpin(bp);
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}
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/*
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* This is called to unpin the buffer associated with the buf log
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* item which was previously pinned with a call to xfs_buf_item_pin().
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* Just call bunpin() on the buffer to do this.
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*
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* Also drop the reference to the buf item for the current transaction.
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* If the XFS_BLI_STALE flag is set and we are the last reference,
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* then free up the buf log item and unlock the buffer.
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*/
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STATIC void
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xfs_buf_item_unpin(
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xfs_buf_log_item_t *bip,
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int stale)
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{
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struct xfs_ail *ailp;
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xfs_buf_t *bp;
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int freed;
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bp = bip->bli_buf;
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ASSERT(bp != NULL);
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ASSERT(XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *) == bip);
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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xfs_buf_item_trace("UNPIN", bip);
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xfs_buftrace("XFS_UNPIN", bp);
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freed = atomic_dec_and_test(&bip->bli_refcount);
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ailp = bip->bli_item.li_ailp;
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xfs_bunpin(bp);
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if (freed && stale) {
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ASSERT(bip->bli_flags & XFS_BLI_STALE);
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ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
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ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
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ASSERT(XFS_BUF_ISSTALE(bp));
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ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL);
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xfs_buf_item_trace("UNPIN STALE", bip);
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xfs_buftrace("XFS_UNPIN STALE", bp);
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/*
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* If we get called here because of an IO error, we may
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* or may not have the item on the AIL. xfs_trans_ail_delete()
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* will take care of that situation.
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* xfs_trans_ail_delete() drops the AIL lock.
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*/
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if (bip->bli_flags & XFS_BLI_STALE_INODE) {
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xfs_buf_do_callbacks(bp, (xfs_log_item_t *)bip);
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XFS_BUF_SET_FSPRIVATE(bp, NULL);
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XFS_BUF_CLR_IODONE_FUNC(bp);
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} else {
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spin_lock(&ailp->xa_lock);
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xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip);
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xfs_buf_item_relse(bp);
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ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL);
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}
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xfs_buf_relse(bp);
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}
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}
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|
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/*
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* this is called from uncommit in the forced-shutdown path.
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* we need to check to see if the reference count on the log item
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* is going to drop to zero. If so, unpin will free the log item
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* so we need to free the item's descriptor (that points to the item)
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* in the transaction.
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*/
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STATIC void
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xfs_buf_item_unpin_remove(
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xfs_buf_log_item_t *bip,
|
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xfs_trans_t *tp)
|
|
{
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xfs_buf_t *bp;
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xfs_log_item_desc_t *lidp;
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int stale = 0;
|
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bp = bip->bli_buf;
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/*
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* will xfs_buf_item_unpin() call xfs_buf_item_relse()?
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*/
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if ((atomic_read(&bip->bli_refcount) == 1) &&
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(bip->bli_flags & XFS_BLI_STALE)) {
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ASSERT(XFS_BUF_VALUSEMA(bip->bli_buf) <= 0);
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xfs_buf_item_trace("UNPIN REMOVE", bip);
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xfs_buftrace("XFS_UNPIN_REMOVE", bp);
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/*
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* yes -- clear the xaction descriptor in-use flag
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* and free the chunk if required. We can safely
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* do some work here and then call buf_item_unpin
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* to do the rest because if the if is true, then
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* we are holding the buffer locked so no one else
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* will be able to bump up the refcount.
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*/
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lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) bip);
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stale = lidp->lid_flags & XFS_LID_BUF_STALE;
|
|
xfs_trans_free_item(tp, lidp);
|
|
/*
|
|
* Since the transaction no longer refers to the buffer,
|
|
* the buffer should no longer refer to the transaction.
|
|
*/
|
|
XFS_BUF_SET_FSPRIVATE2(bp, NULL);
|
|
}
|
|
|
|
xfs_buf_item_unpin(bip, stale);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* This is called to attempt to lock the buffer associated with this
|
|
* buf log item. Don't sleep on the buffer lock. If we can't get
|
|
* the lock right away, return 0. If we can get the lock, pull the
|
|
* buffer from the free list, mark it busy, and return 1.
|
|
*/
|
|
STATIC uint
|
|
xfs_buf_item_trylock(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
xfs_buf_t *bp;
|
|
|
|
bp = bip->bli_buf;
|
|
|
|
if (XFS_BUF_ISPINNED(bp)) {
|
|
return XFS_ITEM_PINNED;
|
|
}
|
|
|
|
if (!XFS_BUF_CPSEMA(bp)) {
|
|
return XFS_ITEM_LOCKED;
|
|
}
|
|
|
|
/*
|
|
* Remove the buffer from the free list. Only do this
|
|
* if it's on the free list. Private buffers like the
|
|
* superblock buffer are not.
|
|
*/
|
|
XFS_BUF_HOLD(bp);
|
|
|
|
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
|
|
xfs_buf_item_trace("TRYLOCK SUCCESS", bip);
|
|
return XFS_ITEM_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Release the buffer associated with the buf log item.
|
|
* If there is no dirty logged data associated with the
|
|
* buffer recorded in the buf log item, then free the
|
|
* buf log item and remove the reference to it in the
|
|
* buffer.
|
|
*
|
|
* This call ignores the recursion count. It is only called
|
|
* when the buffer should REALLY be unlocked, regardless
|
|
* of the recursion count.
|
|
*
|
|
* If the XFS_BLI_HOLD flag is set in the buf log item, then
|
|
* free the log item if necessary but do not unlock the buffer.
|
|
* This is for support of xfs_trans_bhold(). Make sure the
|
|
* XFS_BLI_HOLD field is cleared if we don't free the item.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_item_unlock(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
int aborted;
|
|
xfs_buf_t *bp;
|
|
uint hold;
|
|
|
|
bp = bip->bli_buf;
|
|
xfs_buftrace("XFS_UNLOCK", bp);
|
|
|
|
/*
|
|
* Clear the buffer's association with this transaction.
|
|
*/
|
|
XFS_BUF_SET_FSPRIVATE2(bp, NULL);
|
|
|
|
/*
|
|
* If this is a transaction abort, don't return early.
|
|
* Instead, allow the brelse to happen.
|
|
* Normally it would be done for stale (cancelled) buffers
|
|
* at unpin time, but we'll never go through the pin/unpin
|
|
* cycle if we abort inside commit.
|
|
*/
|
|
aborted = (bip->bli_item.li_flags & XFS_LI_ABORTED) != 0;
|
|
|
|
/*
|
|
* If the buf item is marked stale, then don't do anything.
|
|
* We'll unlock the buffer and free the buf item when the
|
|
* buffer is unpinned for the last time.
|
|
*/
|
|
if (bip->bli_flags & XFS_BLI_STALE) {
|
|
bip->bli_flags &= ~XFS_BLI_LOGGED;
|
|
xfs_buf_item_trace("UNLOCK STALE", bip);
|
|
ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL);
|
|
if (!aborted)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Drop the transaction's reference to the log item if
|
|
* it was not logged as part of the transaction. Otherwise
|
|
* we'll drop the reference in xfs_buf_item_unpin() when
|
|
* the transaction is really through with the buffer.
|
|
*/
|
|
if (!(bip->bli_flags & XFS_BLI_LOGGED)) {
|
|
atomic_dec(&bip->bli_refcount);
|
|
} else {
|
|
/*
|
|
* Clear the logged flag since this is per
|
|
* transaction state.
|
|
*/
|
|
bip->bli_flags &= ~XFS_BLI_LOGGED;
|
|
}
|
|
|
|
/*
|
|
* Before possibly freeing the buf item, determine if we should
|
|
* release the buffer at the end of this routine.
|
|
*/
|
|
hold = bip->bli_flags & XFS_BLI_HOLD;
|
|
xfs_buf_item_trace("UNLOCK", bip);
|
|
|
|
/*
|
|
* If the buf item isn't tracking any data, free it.
|
|
* Otherwise, if XFS_BLI_HOLD is set clear it.
|
|
*/
|
|
if (xfs_bitmap_empty(bip->bli_format.blf_data_map,
|
|
bip->bli_format.blf_map_size)) {
|
|
xfs_buf_item_relse(bp);
|
|
} else if (hold) {
|
|
bip->bli_flags &= ~XFS_BLI_HOLD;
|
|
}
|
|
|
|
/*
|
|
* Release the buffer if XFS_BLI_HOLD was not set.
|
|
*/
|
|
if (!hold) {
|
|
xfs_buf_relse(bp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called to find out where the oldest active copy of the
|
|
* buf log item in the on disk log resides now that the last log
|
|
* write of it completed at the given lsn.
|
|
* We always re-log all the dirty data in a buffer, so usually the
|
|
* latest copy in the on disk log is the only one that matters. For
|
|
* those cases we simply return the given lsn.
|
|
*
|
|
* The one exception to this is for buffers full of newly allocated
|
|
* inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF
|
|
* flag set, indicating that only the di_next_unlinked fields from the
|
|
* inodes in the buffers will be replayed during recovery. If the
|
|
* original newly allocated inode images have not yet been flushed
|
|
* when the buffer is so relogged, then we need to make sure that we
|
|
* keep the old images in the 'active' portion of the log. We do this
|
|
* by returning the original lsn of that transaction here rather than
|
|
* the current one.
|
|
*/
|
|
STATIC xfs_lsn_t
|
|
xfs_buf_item_committed(
|
|
xfs_buf_log_item_t *bip,
|
|
xfs_lsn_t lsn)
|
|
{
|
|
xfs_buf_item_trace("COMMITTED", bip);
|
|
if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) &&
|
|
(bip->bli_item.li_lsn != 0)) {
|
|
return bip->bli_item.li_lsn;
|
|
}
|
|
return (lsn);
|
|
}
|
|
|
|
/*
|
|
* This is called to asynchronously write the buffer associated with this
|
|
* buf log item out to disk. The buffer will already have been locked by
|
|
* a successful call to xfs_buf_item_trylock(). If the buffer still has
|
|
* B_DELWRI set, then get it going out to disk with a call to bawrite().
|
|
* If not, then just release the buffer.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_item_push(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
xfs_buf_t *bp;
|
|
|
|
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
|
|
xfs_buf_item_trace("PUSH", bip);
|
|
|
|
bp = bip->bli_buf;
|
|
|
|
if (XFS_BUF_ISDELAYWRITE(bp)) {
|
|
int error;
|
|
error = xfs_bawrite(bip->bli_item.li_mountp, bp);
|
|
if (error)
|
|
xfs_fs_cmn_err(CE_WARN, bip->bli_item.li_mountp,
|
|
"xfs_buf_item_push: pushbuf error %d on bip %p, bp %p",
|
|
error, bip, bp);
|
|
} else {
|
|
xfs_buf_relse(bp);
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
STATIC void
|
|
xfs_buf_item_committing(xfs_buf_log_item_t *bip, xfs_lsn_t commit_lsn)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* This is the ops vector shared by all buf log items.
|
|
*/
|
|
static struct xfs_item_ops xfs_buf_item_ops = {
|
|
.iop_size = (uint(*)(xfs_log_item_t*))xfs_buf_item_size,
|
|
.iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
|
|
xfs_buf_item_format,
|
|
.iop_pin = (void(*)(xfs_log_item_t*))xfs_buf_item_pin,
|
|
.iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_buf_item_unpin,
|
|
.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
|
|
xfs_buf_item_unpin_remove,
|
|
.iop_trylock = (uint(*)(xfs_log_item_t*))xfs_buf_item_trylock,
|
|
.iop_unlock = (void(*)(xfs_log_item_t*))xfs_buf_item_unlock,
|
|
.iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
|
|
xfs_buf_item_committed,
|
|
.iop_push = (void(*)(xfs_log_item_t*))xfs_buf_item_push,
|
|
.iop_pushbuf = NULL,
|
|
.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
|
|
xfs_buf_item_committing
|
|
};
|
|
|
|
|
|
/*
|
|
* Allocate a new buf log item to go with the given buffer.
|
|
* Set the buffer's b_fsprivate field to point to the new
|
|
* buf log item. If there are other item's attached to the
|
|
* buffer (see xfs_buf_attach_iodone() below), then put the
|
|
* buf log item at the front.
|
|
*/
|
|
void
|
|
xfs_buf_item_init(
|
|
xfs_buf_t *bp,
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_log_item_t *lip;
|
|
xfs_buf_log_item_t *bip;
|
|
int chunks;
|
|
int map_size;
|
|
|
|
/*
|
|
* Check to see if there is already a buf log item for
|
|
* this buffer. If there is, it is guaranteed to be
|
|
* the first. If we do already have one, there is
|
|
* nothing to do here so return.
|
|
*/
|
|
if (XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *) != mp)
|
|
XFS_BUF_SET_FSPRIVATE3(bp, mp);
|
|
XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb);
|
|
if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) {
|
|
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
if (lip->li_type == XFS_LI_BUF) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* chunks is the number of XFS_BLI_CHUNK size pieces
|
|
* the buffer can be divided into. Make sure not to
|
|
* truncate any pieces. map_size is the size of the
|
|
* bitmap needed to describe the chunks of the buffer.
|
|
*/
|
|
chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLI_CHUNK - 1)) >> XFS_BLI_SHIFT);
|
|
map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT);
|
|
|
|
bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone,
|
|
KM_SLEEP);
|
|
bip->bli_item.li_type = XFS_LI_BUF;
|
|
bip->bli_item.li_ops = &xfs_buf_item_ops;
|
|
bip->bli_item.li_mountp = mp;
|
|
bip->bli_item.li_ailp = mp->m_ail;
|
|
bip->bli_buf = bp;
|
|
xfs_buf_hold(bp);
|
|
bip->bli_format.blf_type = XFS_LI_BUF;
|
|
bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp);
|
|
bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp));
|
|
bip->bli_format.blf_map_size = map_size;
|
|
#ifdef XFS_BLI_TRACE
|
|
bip->bli_trace = ktrace_alloc(XFS_BLI_TRACE_SIZE, KM_NOFS);
|
|
#endif
|
|
|
|
#ifdef XFS_TRANS_DEBUG
|
|
/*
|
|
* Allocate the arrays for tracking what needs to be logged
|
|
* and what our callers request to be logged. bli_orig
|
|
* holds a copy of the original, clean buffer for comparison
|
|
* against, and bli_logged keeps a 1 bit flag per byte in
|
|
* the buffer to indicate which bytes the callers have asked
|
|
* to have logged.
|
|
*/
|
|
bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP);
|
|
memcpy(bip->bli_orig, XFS_BUF_PTR(bp), XFS_BUF_COUNT(bp));
|
|
bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP);
|
|
#endif
|
|
|
|
/*
|
|
* Put the buf item into the list of items attached to the
|
|
* buffer at the front.
|
|
*/
|
|
if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) {
|
|
bip->bli_item.li_bio_list =
|
|
XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
}
|
|
XFS_BUF_SET_FSPRIVATE(bp, bip);
|
|
}
|
|
|
|
|
|
/*
|
|
* Mark bytes first through last inclusive as dirty in the buf
|
|
* item's bitmap.
|
|
*/
|
|
void
|
|
xfs_buf_item_log(
|
|
xfs_buf_log_item_t *bip,
|
|
uint first,
|
|
uint last)
|
|
{
|
|
uint first_bit;
|
|
uint last_bit;
|
|
uint bits_to_set;
|
|
uint bits_set;
|
|
uint word_num;
|
|
uint *wordp;
|
|
uint bit;
|
|
uint end_bit;
|
|
uint mask;
|
|
|
|
/*
|
|
* Mark the item as having some dirty data for
|
|
* quick reference in xfs_buf_item_dirty.
|
|
*/
|
|
bip->bli_flags |= XFS_BLI_DIRTY;
|
|
|
|
/*
|
|
* Convert byte offsets to bit numbers.
|
|
*/
|
|
first_bit = first >> XFS_BLI_SHIFT;
|
|
last_bit = last >> XFS_BLI_SHIFT;
|
|
|
|
/*
|
|
* Calculate the total number of bits to be set.
|
|
*/
|
|
bits_to_set = last_bit - first_bit + 1;
|
|
|
|
/*
|
|
* Get a pointer to the first word in the bitmap
|
|
* to set a bit in.
|
|
*/
|
|
word_num = first_bit >> BIT_TO_WORD_SHIFT;
|
|
wordp = &(bip->bli_format.blf_data_map[word_num]);
|
|
|
|
/*
|
|
* Calculate the starting bit in the first word.
|
|
*/
|
|
bit = first_bit & (uint)(NBWORD - 1);
|
|
|
|
/*
|
|
* First set any bits in the first word of our range.
|
|
* If it starts at bit 0 of the word, it will be
|
|
* set below rather than here. That is what the variable
|
|
* bit tells us. The variable bits_set tracks the number
|
|
* of bits that have been set so far. End_bit is the number
|
|
* of the last bit to be set in this word plus one.
|
|
*/
|
|
if (bit) {
|
|
end_bit = MIN(bit + bits_to_set, (uint)NBWORD);
|
|
mask = ((1 << (end_bit - bit)) - 1) << bit;
|
|
*wordp |= mask;
|
|
wordp++;
|
|
bits_set = end_bit - bit;
|
|
} else {
|
|
bits_set = 0;
|
|
}
|
|
|
|
/*
|
|
* Now set bits a whole word at a time that are between
|
|
* first_bit and last_bit.
|
|
*/
|
|
while ((bits_to_set - bits_set) >= NBWORD) {
|
|
*wordp |= 0xffffffff;
|
|
bits_set += NBWORD;
|
|
wordp++;
|
|
}
|
|
|
|
/*
|
|
* Finally, set any bits left to be set in one last partial word.
|
|
*/
|
|
end_bit = bits_to_set - bits_set;
|
|
if (end_bit) {
|
|
mask = (1 << end_bit) - 1;
|
|
*wordp |= mask;
|
|
}
|
|
|
|
xfs_buf_item_log_debug(bip, first, last);
|
|
}
|
|
|
|
|
|
/*
|
|
* Return 1 if the buffer has some data that has been logged (at any
|
|
* point, not just the current transaction) and 0 if not.
|
|
*/
|
|
uint
|
|
xfs_buf_item_dirty(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
return (bip->bli_flags & XFS_BLI_DIRTY);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_buf_item_free(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
#ifdef XFS_TRANS_DEBUG
|
|
kmem_free(bip->bli_orig);
|
|
kmem_free(bip->bli_logged);
|
|
#endif /* XFS_TRANS_DEBUG */
|
|
|
|
#ifdef XFS_BLI_TRACE
|
|
ktrace_free(bip->bli_trace);
|
|
#endif
|
|
kmem_zone_free(xfs_buf_item_zone, bip);
|
|
}
|
|
|
|
/*
|
|
* This is called when the buf log item is no longer needed. It should
|
|
* free the buf log item associated with the given buffer and clear
|
|
* the buffer's pointer to the buf log item. If there are no more
|
|
* items in the list, clear the b_iodone field of the buffer (see
|
|
* xfs_buf_attach_iodone() below).
|
|
*/
|
|
void
|
|
xfs_buf_item_relse(
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_buf_log_item_t *bip;
|
|
|
|
xfs_buftrace("XFS_RELSE", bp);
|
|
bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*);
|
|
XFS_BUF_SET_FSPRIVATE(bp, bip->bli_item.li_bio_list);
|
|
if ((XFS_BUF_FSPRIVATE(bp, void *) == NULL) &&
|
|
(XFS_BUF_IODONE_FUNC(bp) != NULL)) {
|
|
XFS_BUF_CLR_IODONE_FUNC(bp);
|
|
}
|
|
xfs_buf_rele(bp);
|
|
xfs_buf_item_free(bip);
|
|
}
|
|
|
|
|
|
/*
|
|
* Add the given log item with its callback to the list of callbacks
|
|
* to be called when the buffer's I/O completes. If it is not set
|
|
* already, set the buffer's b_iodone() routine to be
|
|
* xfs_buf_iodone_callbacks() and link the log item into the list of
|
|
* items rooted at b_fsprivate. Items are always added as the second
|
|
* entry in the list if there is a first, because the buf item code
|
|
* assumes that the buf log item is first.
|
|
*/
|
|
void
|
|
xfs_buf_attach_iodone(
|
|
xfs_buf_t *bp,
|
|
void (*cb)(xfs_buf_t *, xfs_log_item_t *),
|
|
xfs_log_item_t *lip)
|
|
{
|
|
xfs_log_item_t *head_lip;
|
|
|
|
ASSERT(XFS_BUF_ISBUSY(bp));
|
|
ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
|
|
|
|
lip->li_cb = cb;
|
|
if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) {
|
|
head_lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
lip->li_bio_list = head_lip->li_bio_list;
|
|
head_lip->li_bio_list = lip;
|
|
} else {
|
|
XFS_BUF_SET_FSPRIVATE(bp, lip);
|
|
}
|
|
|
|
ASSERT((XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks) ||
|
|
(XFS_BUF_IODONE_FUNC(bp) == NULL));
|
|
XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_buf_do_callbacks(
|
|
xfs_buf_t *bp,
|
|
xfs_log_item_t *lip)
|
|
{
|
|
xfs_log_item_t *nlip;
|
|
|
|
while (lip != NULL) {
|
|
nlip = lip->li_bio_list;
|
|
ASSERT(lip->li_cb != NULL);
|
|
/*
|
|
* Clear the next pointer so we don't have any
|
|
* confusion if the item is added to another buf.
|
|
* Don't touch the log item after calling its
|
|
* callback, because it could have freed itself.
|
|
*/
|
|
lip->li_bio_list = NULL;
|
|
lip->li_cb(bp, lip);
|
|
lip = nlip;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the iodone() function for buffers which have had callbacks
|
|
* attached to them by xfs_buf_attach_iodone(). It should remove each
|
|
* log item from the buffer's list and call the callback of each in turn.
|
|
* When done, the buffer's fsprivate field is set to NULL and the buffer
|
|
* is unlocked with a call to iodone().
|
|
*/
|
|
void
|
|
xfs_buf_iodone_callbacks(
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_log_item_t *lip;
|
|
static ulong lasttime;
|
|
static xfs_buftarg_t *lasttarg;
|
|
xfs_mount_t *mp;
|
|
|
|
ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL);
|
|
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
|
|
if (XFS_BUF_GETERROR(bp) != 0) {
|
|
/*
|
|
* If we've already decided to shutdown the filesystem
|
|
* because of IO errors, there's no point in giving this
|
|
* a retry.
|
|
*/
|
|
mp = lip->li_mountp;
|
|
if (XFS_FORCED_SHUTDOWN(mp)) {
|
|
ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp);
|
|
XFS_BUF_SUPER_STALE(bp);
|
|
xfs_buftrace("BUF_IODONE_CB", bp);
|
|
xfs_buf_do_callbacks(bp, lip);
|
|
XFS_BUF_SET_FSPRIVATE(bp, NULL);
|
|
XFS_BUF_CLR_IODONE_FUNC(bp);
|
|
|
|
/*
|
|
* XFS_SHUT flag gets set when we go thru the
|
|
* entire buffer cache and deliberately start
|
|
* throwing away delayed write buffers.
|
|
* Since there's no biowait done on those,
|
|
* we should just brelse them.
|
|
*/
|
|
if (XFS_BUF_ISSHUT(bp)) {
|
|
XFS_BUF_UNSHUT(bp);
|
|
xfs_buf_relse(bp);
|
|
} else {
|
|
xfs_biodone(bp);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if ((XFS_BUF_TARGET(bp) != lasttarg) ||
|
|
(time_after(jiffies, (lasttime + 5*HZ)))) {
|
|
lasttime = jiffies;
|
|
cmn_err(CE_ALERT, "Device %s, XFS metadata write error"
|
|
" block 0x%llx in %s",
|
|
XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
|
|
(__uint64_t)XFS_BUF_ADDR(bp), mp->m_fsname);
|
|
}
|
|
lasttarg = XFS_BUF_TARGET(bp);
|
|
|
|
if (XFS_BUF_ISASYNC(bp)) {
|
|
/*
|
|
* If the write was asynchronous then noone will be
|
|
* looking for the error. Clear the error state
|
|
* and write the buffer out again delayed write.
|
|
*
|
|
* XXXsup This is OK, so long as we catch these
|
|
* before we start the umount; we don't want these
|
|
* DELWRI metadata bufs to be hanging around.
|
|
*/
|
|
XFS_BUF_ERROR(bp,0); /* errno of 0 unsets the flag */
|
|
|
|
if (!(XFS_BUF_ISSTALE(bp))) {
|
|
XFS_BUF_DELAYWRITE(bp);
|
|
XFS_BUF_DONE(bp);
|
|
XFS_BUF_SET_START(bp);
|
|
}
|
|
ASSERT(XFS_BUF_IODONE_FUNC(bp));
|
|
xfs_buftrace("BUF_IODONE ASYNC", bp);
|
|
xfs_buf_relse(bp);
|
|
} else {
|
|
/*
|
|
* If the write of the buffer was not asynchronous,
|
|
* then we want to make sure to return the error
|
|
* to the caller of bwrite(). Because of this we
|
|
* cannot clear the B_ERROR state at this point.
|
|
* Instead we install a callback function that
|
|
* will be called when the buffer is released, and
|
|
* that routine will clear the error state and
|
|
* set the buffer to be written out again after
|
|
* some delay.
|
|
*/
|
|
/* We actually overwrite the existing b-relse
|
|
function at times, but we're gonna be shutting down
|
|
anyway. */
|
|
XFS_BUF_SET_BRELSE_FUNC(bp,xfs_buf_error_relse);
|
|
XFS_BUF_DONE(bp);
|
|
XFS_BUF_FINISH_IOWAIT(bp);
|
|
}
|
|
return;
|
|
}
|
|
#ifdef XFSERRORDEBUG
|
|
xfs_buftrace("XFS BUFCB NOERR", bp);
|
|
#endif
|
|
xfs_buf_do_callbacks(bp, lip);
|
|
XFS_BUF_SET_FSPRIVATE(bp, NULL);
|
|
XFS_BUF_CLR_IODONE_FUNC(bp);
|
|
xfs_biodone(bp);
|
|
}
|
|
|
|
/*
|
|
* This is a callback routine attached to a buffer which gets an error
|
|
* when being written out synchronously.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_error_relse(
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_log_item_t *lip;
|
|
xfs_mount_t *mp;
|
|
|
|
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
mp = (xfs_mount_t *)lip->li_mountp;
|
|
ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp);
|
|
|
|
XFS_BUF_STALE(bp);
|
|
XFS_BUF_DONE(bp);
|
|
XFS_BUF_UNDELAYWRITE(bp);
|
|
XFS_BUF_ERROR(bp,0);
|
|
xfs_buftrace("BUF_ERROR_RELSE", bp);
|
|
if (! XFS_FORCED_SHUTDOWN(mp))
|
|
xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
|
|
/*
|
|
* We have to unpin the pinned buffers so do the
|
|
* callbacks.
|
|
*/
|
|
xfs_buf_do_callbacks(bp, lip);
|
|
XFS_BUF_SET_FSPRIVATE(bp, NULL);
|
|
XFS_BUF_CLR_IODONE_FUNC(bp);
|
|
XFS_BUF_SET_BRELSE_FUNC(bp,NULL);
|
|
xfs_buf_relse(bp);
|
|
}
|
|
|
|
|
|
/*
|
|
* This is the iodone() function for buffers which have been
|
|
* logged. It is called when they are eventually flushed out.
|
|
* It should remove the buf item from the AIL, and free the buf item.
|
|
* It is called by xfs_buf_iodone_callbacks() above which will take
|
|
* care of cleaning up the buffer itself.
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
xfs_buf_iodone(
|
|
xfs_buf_t *bp,
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
struct xfs_ail *ailp = bip->bli_item.li_ailp;
|
|
|
|
ASSERT(bip->bli_buf == bp);
|
|
|
|
xfs_buf_rele(bp);
|
|
|
|
/*
|
|
* If we are forcibly shutting down, this may well be
|
|
* off the AIL already. That's because we simulate the
|
|
* log-committed callbacks to unpin these buffers. Or we may never
|
|
* have put this item on AIL because of the transaction was
|
|
* aborted forcibly. xfs_trans_ail_delete() takes care of these.
|
|
*
|
|
* Either way, AIL is useless if we're forcing a shutdown.
|
|
*/
|
|
spin_lock(&ailp->xa_lock);
|
|
xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip);
|
|
xfs_buf_item_free(bip);
|
|
}
|
|
|
|
#if defined(XFS_BLI_TRACE)
|
|
void
|
|
xfs_buf_item_trace(
|
|
char *id,
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
xfs_buf_t *bp;
|
|
ASSERT(bip->bli_trace != NULL);
|
|
|
|
bp = bip->bli_buf;
|
|
ktrace_enter(bip->bli_trace,
|
|
(void *)id,
|
|
(void *)bip->bli_buf,
|
|
(void *)((unsigned long)bip->bli_flags),
|
|
(void *)((unsigned long)bip->bli_recur),
|
|
(void *)((unsigned long)atomic_read(&bip->bli_refcount)),
|
|
(void *)((unsigned long)
|
|
(0xFFFFFFFF & XFS_BUF_ADDR(bp) >> 32)),
|
|
(void *)((unsigned long)(0xFFFFFFFF & XFS_BUF_ADDR(bp))),
|
|
(void *)((unsigned long)XFS_BUF_COUNT(bp)),
|
|
(void *)((unsigned long)XFS_BUF_BFLAGS(bp)),
|
|
XFS_BUF_FSPRIVATE(bp, void *),
|
|
XFS_BUF_FSPRIVATE2(bp, void *),
|
|
(void *)(unsigned long)XFS_BUF_ISPINNED(bp),
|
|
(void *)XFS_BUF_IODONE_FUNC(bp),
|
|
(void *)((unsigned long)(XFS_BUF_VALUSEMA(bp))),
|
|
(void *)bip->bli_item.li_desc,
|
|
(void *)((unsigned long)bip->bli_item.li_flags));
|
|
}
|
|
#endif /* XFS_BLI_TRACE */
|