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c551f66c5d
Building the kernel with W=1 results in a number of kernel-doc warnings like incorrect function names and parameter descriptions. Fix those, mostly by adding missing parameter descriptions, removing left-over descriptions, and demoting some less important kernel-doc comments into regular comments. Originally proposed by Lee Jones; improved and combined into a single patch by Andreas. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2776 lines
73 KiB
C
2776 lines
73 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/prefetch.h>
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#include <linux/blkdev.h>
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#include <linux/rbtree.h>
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#include <linux/random.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "glops.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "super.h"
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#include "trans.h"
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#include "util.h"
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#include "log.h"
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#include "inode.h"
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#include "trace_gfs2.h"
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#include "dir.h"
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#define BFITNOENT ((u32)~0)
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#define NO_BLOCK ((u64)~0)
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struct gfs2_rbm {
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struct gfs2_rgrpd *rgd;
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u32 offset; /* The offset is bitmap relative */
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int bii; /* Bitmap index */
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};
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static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
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{
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return rbm->rgd->rd_bits + rbm->bii;
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}
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static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
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{
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BUG_ON(rbm->offset >= rbm->rgd->rd_data);
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return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
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rbm->offset;
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}
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/*
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* These routines are used by the resource group routines (rgrp.c)
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* to keep track of block allocation. Each block is represented by two
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* bits. So, each byte represents GFS2_NBBY (i.e. 4) blocks.
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*
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* 0 = Free
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* 1 = Used (not metadata)
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* 2 = Unlinked (still in use) inode
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* 3 = Used (metadata)
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*/
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struct gfs2_extent {
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struct gfs2_rbm rbm;
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u32 len;
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};
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static const char valid_change[16] = {
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/* current */
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/* n */ 0, 1, 1, 1,
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/* e */ 1, 0, 0, 0,
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/* w */ 0, 0, 0, 1,
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1, 0, 0, 0
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};
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static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext,
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struct gfs2_blkreserv *rs, bool nowrap);
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/**
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* gfs2_setbit - Set a bit in the bitmaps
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* @rbm: The position of the bit to set
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* @do_clone: Also set the clone bitmap, if it exists
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* @new_state: the new state of the block
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*
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*/
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static inline void gfs2_setbit(const struct gfs2_rbm *rbm, bool do_clone,
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unsigned char new_state)
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{
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unsigned char *byte1, *byte2, *end, cur_state;
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struct gfs2_bitmap *bi = rbm_bi(rbm);
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unsigned int buflen = bi->bi_bytes;
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const unsigned int bit = (rbm->offset % GFS2_NBBY) * GFS2_BIT_SIZE;
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byte1 = bi->bi_bh->b_data + bi->bi_offset + (rbm->offset / GFS2_NBBY);
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end = bi->bi_bh->b_data + bi->bi_offset + buflen;
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BUG_ON(byte1 >= end);
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cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;
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if (unlikely(!valid_change[new_state * 4 + cur_state])) {
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struct gfs2_sbd *sdp = rbm->rgd->rd_sbd;
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fs_warn(sdp, "buf_blk = 0x%x old_state=%d, new_state=%d\n",
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rbm->offset, cur_state, new_state);
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fs_warn(sdp, "rgrp=0x%llx bi_start=0x%x biblk: 0x%llx\n",
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(unsigned long long)rbm->rgd->rd_addr, bi->bi_start,
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(unsigned long long)bi->bi_bh->b_blocknr);
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fs_warn(sdp, "bi_offset=0x%x bi_bytes=0x%x block=0x%llx\n",
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bi->bi_offset, bi->bi_bytes,
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(unsigned long long)gfs2_rbm_to_block(rbm));
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dump_stack();
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gfs2_consist_rgrpd(rbm->rgd);
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return;
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}
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*byte1 ^= (cur_state ^ new_state) << bit;
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if (do_clone && bi->bi_clone) {
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byte2 = bi->bi_clone + bi->bi_offset + (rbm->offset / GFS2_NBBY);
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cur_state = (*byte2 >> bit) & GFS2_BIT_MASK;
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*byte2 ^= (cur_state ^ new_state) << bit;
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}
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}
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/**
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* gfs2_testbit - test a bit in the bitmaps
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* @rbm: The bit to test
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* @use_clone: If true, test the clone bitmap, not the official bitmap.
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*
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* Some callers like gfs2_unaligned_extlen need to test the clone bitmaps,
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* not the "real" bitmaps, to avoid allocating recently freed blocks.
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*
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* Returns: The two bit block state of the requested bit
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*/
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static inline u8 gfs2_testbit(const struct gfs2_rbm *rbm, bool use_clone)
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{
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struct gfs2_bitmap *bi = rbm_bi(rbm);
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const u8 *buffer;
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const u8 *byte;
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unsigned int bit;
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if (use_clone && bi->bi_clone)
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buffer = bi->bi_clone;
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else
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buffer = bi->bi_bh->b_data;
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buffer += bi->bi_offset;
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byte = buffer + (rbm->offset / GFS2_NBBY);
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bit = (rbm->offset % GFS2_NBBY) * GFS2_BIT_SIZE;
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return (*byte >> bit) & GFS2_BIT_MASK;
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}
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/**
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* gfs2_bit_search
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* @ptr: Pointer to bitmap data
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* @mask: Mask to use (normally 0x55555.... but adjusted for search start)
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* @state: The state we are searching for
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*
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* We xor the bitmap data with a patter which is the bitwise opposite
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* of what we are looking for, this gives rise to a pattern of ones
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* wherever there is a match. Since we have two bits per entry, we
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* take this pattern, shift it down by one place and then and it with
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* the original. All the even bit positions (0,2,4, etc) then represent
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* successful matches, so we mask with 0x55555..... to remove the unwanted
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* odd bit positions.
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*
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* This allows searching of a whole u64 at once (32 blocks) with a
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* single test (on 64 bit arches).
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*/
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static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
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{
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u64 tmp;
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static const u64 search[] = {
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[0] = 0xffffffffffffffffULL,
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[1] = 0xaaaaaaaaaaaaaaaaULL,
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[2] = 0x5555555555555555ULL,
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[3] = 0x0000000000000000ULL,
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};
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tmp = le64_to_cpu(*ptr) ^ search[state];
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tmp &= (tmp >> 1);
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tmp &= mask;
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return tmp;
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}
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/**
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* rs_cmp - multi-block reservation range compare
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* @start: start of the new reservation
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* @len: number of blocks in the new reservation
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* @rs: existing reservation to compare against
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*
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* returns: 1 if the block range is beyond the reach of the reservation
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* -1 if the block range is before the start of the reservation
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* 0 if the block range overlaps with the reservation
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*/
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static inline int rs_cmp(u64 start, u32 len, struct gfs2_blkreserv *rs)
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{
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if (start >= rs->rs_start + rs->rs_requested)
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return 1;
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if (rs->rs_start >= start + len)
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return -1;
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return 0;
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}
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/**
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* gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
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* a block in a given allocation state.
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* @buf: the buffer that holds the bitmaps
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* @len: the length (in bytes) of the buffer
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* @goal: start search at this block's bit-pair (within @buffer)
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* @state: GFS2_BLKST_XXX the state of the block we're looking for.
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*
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* Scope of @goal and returned block number is only within this bitmap buffer,
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* not entire rgrp or filesystem. @buffer will be offset from the actual
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* beginning of a bitmap block buffer, skipping any header structures, but
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* headers are always a multiple of 64 bits long so that the buffer is
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* always aligned to a 64 bit boundary.
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*
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* The size of the buffer is in bytes, but is it assumed that it is
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* always ok to read a complete multiple of 64 bits at the end
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* of the block in case the end is no aligned to a natural boundary.
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*
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* Return: the block number (bitmap buffer scope) that was found
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*/
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static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
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u32 goal, u8 state)
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{
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u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
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const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);
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const __le64 *end = (__le64 *)(buf + ALIGN(len, sizeof(u64)));
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u64 tmp;
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u64 mask = 0x5555555555555555ULL;
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u32 bit;
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/* Mask off bits we don't care about at the start of the search */
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mask <<= spoint;
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tmp = gfs2_bit_search(ptr, mask, state);
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ptr++;
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while(tmp == 0 && ptr < end) {
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tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
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ptr++;
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}
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/* Mask off any bits which are more than len bytes from the start */
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if (ptr == end && (len & (sizeof(u64) - 1)))
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tmp &= (((u64)~0) >> (64 - 8*(len & (sizeof(u64) - 1))));
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/* Didn't find anything, so return */
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if (tmp == 0)
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return BFITNOENT;
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ptr--;
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bit = __ffs64(tmp);
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bit /= 2; /* two bits per entry in the bitmap */
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return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
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}
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/**
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* gfs2_rbm_from_block - Set the rbm based upon rgd and block number
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* @rbm: The rbm with rgd already set correctly
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* @block: The block number (filesystem relative)
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*
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* This sets the bi and offset members of an rbm based on a
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* resource group and a filesystem relative block number. The
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* resource group must be set in the rbm on entry, the bi and
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* offset members will be set by this function.
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*
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* Returns: 0 on success, or an error code
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*/
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static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
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{
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if (!rgrp_contains_block(rbm->rgd, block))
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return -E2BIG;
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rbm->bii = 0;
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rbm->offset = block - rbm->rgd->rd_data0;
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/* Check if the block is within the first block */
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if (rbm->offset < rbm_bi(rbm)->bi_blocks)
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return 0;
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/* Adjust for the size diff between gfs2_meta_header and gfs2_rgrp */
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rbm->offset += (sizeof(struct gfs2_rgrp) -
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sizeof(struct gfs2_meta_header)) * GFS2_NBBY;
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rbm->bii = rbm->offset / rbm->rgd->rd_sbd->sd_blocks_per_bitmap;
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rbm->offset -= rbm->bii * rbm->rgd->rd_sbd->sd_blocks_per_bitmap;
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return 0;
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}
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/**
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* gfs2_rbm_add - add a number of blocks to an rbm
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* @rbm: The rbm with rgd already set correctly
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* @blocks: The number of blocks to add to rpm
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*
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* This function takes an existing rbm structure and adds a number of blocks to
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* it.
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*
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* Returns: True if the new rbm would point past the end of the rgrp.
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*/
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static bool gfs2_rbm_add(struct gfs2_rbm *rbm, u32 blocks)
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{
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struct gfs2_rgrpd *rgd = rbm->rgd;
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struct gfs2_bitmap *bi = rgd->rd_bits + rbm->bii;
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if (rbm->offset + blocks < bi->bi_blocks) {
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rbm->offset += blocks;
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return false;
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}
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blocks -= bi->bi_blocks - rbm->offset;
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for(;;) {
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bi++;
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if (bi == rgd->rd_bits + rgd->rd_length)
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return true;
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if (blocks < bi->bi_blocks) {
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rbm->offset = blocks;
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rbm->bii = bi - rgd->rd_bits;
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return false;
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}
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blocks -= bi->bi_blocks;
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}
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}
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/**
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* gfs2_unaligned_extlen - Look for free blocks which are not byte aligned
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* @rbm: Position to search (value/result)
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* @n_unaligned: Number of unaligned blocks to check
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* @len: Decremented for each block found (terminate on zero)
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*
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* Returns: true if a non-free block is encountered or the end of the resource
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* group is reached.
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*/
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static bool gfs2_unaligned_extlen(struct gfs2_rbm *rbm, u32 n_unaligned, u32 *len)
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{
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u32 n;
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u8 res;
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for (n = 0; n < n_unaligned; n++) {
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res = gfs2_testbit(rbm, true);
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if (res != GFS2_BLKST_FREE)
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return true;
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(*len)--;
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if (*len == 0)
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return true;
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if (gfs2_rbm_add(rbm, 1))
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return true;
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}
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return false;
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}
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/**
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* gfs2_free_extlen - Return extent length of free blocks
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* @rrbm: Starting position
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* @len: Max length to check
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*
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* Starting at the block specified by the rbm, see how many free blocks
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* there are, not reading more than len blocks ahead. This can be done
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* using memchr_inv when the blocks are byte aligned, but has to be done
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* on a block by block basis in case of unaligned blocks. Also this
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* function can cope with bitmap boundaries (although it must stop on
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* a resource group boundary)
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*
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* Returns: Number of free blocks in the extent
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*/
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static u32 gfs2_free_extlen(const struct gfs2_rbm *rrbm, u32 len)
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{
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struct gfs2_rbm rbm = *rrbm;
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u32 n_unaligned = rbm.offset & 3;
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u32 size = len;
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u32 bytes;
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u32 chunk_size;
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u8 *ptr, *start, *end;
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u64 block;
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struct gfs2_bitmap *bi;
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if (n_unaligned &&
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gfs2_unaligned_extlen(&rbm, 4 - n_unaligned, &len))
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goto out;
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n_unaligned = len & 3;
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/* Start is now byte aligned */
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while (len > 3) {
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bi = rbm_bi(&rbm);
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start = bi->bi_bh->b_data;
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if (bi->bi_clone)
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start = bi->bi_clone;
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start += bi->bi_offset;
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end = start + bi->bi_bytes;
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BUG_ON(rbm.offset & 3);
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start += (rbm.offset / GFS2_NBBY);
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bytes = min_t(u32, len / GFS2_NBBY, (end - start));
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ptr = memchr_inv(start, 0, bytes);
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chunk_size = ((ptr == NULL) ? bytes : (ptr - start));
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chunk_size *= GFS2_NBBY;
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BUG_ON(len < chunk_size);
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len -= chunk_size;
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block = gfs2_rbm_to_block(&rbm);
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if (gfs2_rbm_from_block(&rbm, block + chunk_size)) {
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n_unaligned = 0;
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break;
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}
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if (ptr) {
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n_unaligned = 3;
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break;
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}
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n_unaligned = len & 3;
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}
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/* Deal with any bits left over at the end */
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if (n_unaligned)
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gfs2_unaligned_extlen(&rbm, n_unaligned, &len);
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out:
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return size - len;
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}
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/**
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* gfs2_bitcount - count the number of bits in a certain state
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* @rgd: the resource group descriptor
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* @buffer: the buffer that holds the bitmaps
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* @buflen: the length (in bytes) of the buffer
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* @state: the state of the block we're looking for
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*
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* Returns: The number of bits
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*/
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static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
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unsigned int buflen, u8 state)
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{
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const u8 *byte = buffer;
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const u8 *end = buffer + buflen;
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const u8 state1 = state << 2;
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const u8 state2 = state << 4;
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const u8 state3 = state << 6;
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u32 count = 0;
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for (; byte < end; byte++) {
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if (((*byte) & 0x03) == state)
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count++;
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if (((*byte) & 0x0C) == state1)
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count++;
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if (((*byte) & 0x30) == state2)
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count++;
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if (((*byte) & 0xC0) == state3)
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count++;
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}
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return count;
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}
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/**
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* gfs2_rgrp_verify - Verify that a resource group is consistent
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* @rgd: the rgrp
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*
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*/
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void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
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{
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struct gfs2_sbd *sdp = rgd->rd_sbd;
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struct gfs2_bitmap *bi = NULL;
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u32 length = rgd->rd_length;
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u32 count[4], tmp;
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int buf, x;
|
|
|
|
memset(count, 0, 4 * sizeof(u32));
|
|
|
|
/* Count # blocks in each of 4 possible allocation states */
|
|
for (buf = 0; buf < length; buf++) {
|
|
bi = rgd->rd_bits + buf;
|
|
for (x = 0; x < 4; x++)
|
|
count[x] += gfs2_bitcount(rgd,
|
|
bi->bi_bh->b_data +
|
|
bi->bi_offset,
|
|
bi->bi_bytes, x);
|
|
}
|
|
|
|
if (count[0] != rgd->rd_free) {
|
|
gfs2_lm(sdp, "free data mismatch: %u != %u\n",
|
|
count[0], rgd->rd_free);
|
|
gfs2_consist_rgrpd(rgd);
|
|
return;
|
|
}
|
|
|
|
tmp = rgd->rd_data - rgd->rd_free - rgd->rd_dinodes;
|
|
if (count[1] != tmp) {
|
|
gfs2_lm(sdp, "used data mismatch: %u != %u\n",
|
|
count[1], tmp);
|
|
gfs2_consist_rgrpd(rgd);
|
|
return;
|
|
}
|
|
|
|
if (count[2] + count[3] != rgd->rd_dinodes) {
|
|
gfs2_lm(sdp, "used metadata mismatch: %u != %u\n",
|
|
count[2] + count[3], rgd->rd_dinodes);
|
|
gfs2_consist_rgrpd(rgd);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_blk2rgrpd - Find resource group for a given data/meta block number
|
|
* @sdp: The GFS2 superblock
|
|
* @blk: The data block number
|
|
* @exact: True if this needs to be an exact match
|
|
*
|
|
* The @exact argument should be set to true by most callers. The exception
|
|
* is when we need to match blocks which are not represented by the rgrp
|
|
* bitmap, but which are part of the rgrp (i.e. padding blocks) which are
|
|
* there for alignment purposes. Another way of looking at it is that @exact
|
|
* matches only valid data/metadata blocks, but with @exact false, it will
|
|
* match any block within the extent of the rgrp.
|
|
*
|
|
* Returns: The resource group, or NULL if not found
|
|
*/
|
|
|
|
struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact)
|
|
{
|
|
struct rb_node *n, *next;
|
|
struct gfs2_rgrpd *cur;
|
|
|
|
spin_lock(&sdp->sd_rindex_spin);
|
|
n = sdp->sd_rindex_tree.rb_node;
|
|
while (n) {
|
|
cur = rb_entry(n, struct gfs2_rgrpd, rd_node);
|
|
next = NULL;
|
|
if (blk < cur->rd_addr)
|
|
next = n->rb_left;
|
|
else if (blk >= cur->rd_data0 + cur->rd_data)
|
|
next = n->rb_right;
|
|
if (next == NULL) {
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
if (exact) {
|
|
if (blk < cur->rd_addr)
|
|
return NULL;
|
|
if (blk >= cur->rd_data0 + cur->rd_data)
|
|
return NULL;
|
|
}
|
|
return cur;
|
|
}
|
|
n = next;
|
|
}
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* Returns: The first rgrp in the filesystem
|
|
*/
|
|
|
|
struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
|
|
{
|
|
const struct rb_node *n;
|
|
struct gfs2_rgrpd *rgd;
|
|
|
|
spin_lock(&sdp->sd_rindex_spin);
|
|
n = rb_first(&sdp->sd_rindex_tree);
|
|
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
|
|
return rgd;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrpd_get_next - get the next RG
|
|
* @rgd: the resource group descriptor
|
|
*
|
|
* Returns: The next rgrp
|
|
*/
|
|
|
|
struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
const struct rb_node *n;
|
|
|
|
spin_lock(&sdp->sd_rindex_spin);
|
|
n = rb_next(&rgd->rd_node);
|
|
if (n == NULL)
|
|
n = rb_first(&sdp->sd_rindex_tree);
|
|
|
|
if (unlikely(&rgd->rd_node == n)) {
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
return NULL;
|
|
}
|
|
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
return rgd;
|
|
}
|
|
|
|
void check_and_update_goal(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
if (!ip->i_goal || gfs2_blk2rgrpd(sdp, ip->i_goal, 1) == NULL)
|
|
ip->i_goal = ip->i_no_addr;
|
|
}
|
|
|
|
void gfs2_free_clones(struct gfs2_rgrpd *rgd)
|
|
{
|
|
int x;
|
|
|
|
for (x = 0; x < rgd->rd_length; x++) {
|
|
struct gfs2_bitmap *bi = rgd->rd_bits + x;
|
|
kfree(bi->bi_clone);
|
|
bi->bi_clone = NULL;
|
|
}
|
|
}
|
|
|
|
static void dump_rs(struct seq_file *seq, const struct gfs2_blkreserv *rs,
|
|
const char *fs_id_buf)
|
|
{
|
|
struct gfs2_inode *ip = container_of(rs, struct gfs2_inode, i_res);
|
|
|
|
gfs2_print_dbg(seq, "%s B: n:%llu s:%llu f:%u\n",
|
|
fs_id_buf,
|
|
(unsigned long long)ip->i_no_addr,
|
|
(unsigned long long)rs->rs_start,
|
|
rs->rs_requested);
|
|
}
|
|
|
|
/**
|
|
* __rs_deltree - remove a multi-block reservation from the rgd tree
|
|
* @rs: The reservation to remove
|
|
*
|
|
*/
|
|
static void __rs_deltree(struct gfs2_blkreserv *rs)
|
|
{
|
|
struct gfs2_rgrpd *rgd;
|
|
|
|
if (!gfs2_rs_active(rs))
|
|
return;
|
|
|
|
rgd = rs->rs_rgd;
|
|
trace_gfs2_rs(rs, TRACE_RS_TREEDEL);
|
|
rb_erase(&rs->rs_node, &rgd->rd_rstree);
|
|
RB_CLEAR_NODE(&rs->rs_node);
|
|
|
|
if (rs->rs_requested) {
|
|
/* return requested blocks to the rgrp */
|
|
BUG_ON(rs->rs_rgd->rd_requested < rs->rs_requested);
|
|
rs->rs_rgd->rd_requested -= rs->rs_requested;
|
|
|
|
/* The rgrp extent failure point is likely not to increase;
|
|
it will only do so if the freed blocks are somehow
|
|
contiguous with a span of free blocks that follows. Still,
|
|
it will force the number to be recalculated later. */
|
|
rgd->rd_extfail_pt += rs->rs_requested;
|
|
rs->rs_requested = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_rs_deltree - remove a multi-block reservation from the rgd tree
|
|
* @rs: The reservation to remove
|
|
*
|
|
*/
|
|
void gfs2_rs_deltree(struct gfs2_blkreserv *rs)
|
|
{
|
|
struct gfs2_rgrpd *rgd;
|
|
|
|
rgd = rs->rs_rgd;
|
|
if (rgd) {
|
|
spin_lock(&rgd->rd_rsspin);
|
|
__rs_deltree(rs);
|
|
BUG_ON(rs->rs_requested);
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_rs_delete - delete a multi-block reservation
|
|
* @ip: The inode for this reservation
|
|
* @wcount: The inode's write count, or NULL
|
|
*
|
|
*/
|
|
void gfs2_rs_delete(struct gfs2_inode *ip, atomic_t *wcount)
|
|
{
|
|
down_write(&ip->i_rw_mutex);
|
|
if ((wcount == NULL) || (atomic_read(wcount) <= 1))
|
|
gfs2_rs_deltree(&ip->i_res);
|
|
up_write(&ip->i_rw_mutex);
|
|
}
|
|
|
|
/**
|
|
* return_all_reservations - return all reserved blocks back to the rgrp.
|
|
* @rgd: the rgrp that needs its space back
|
|
*
|
|
* We previously reserved a bunch of blocks for allocation. Now we need to
|
|
* give them back. This leave the reservation structures in tact, but removes
|
|
* all of their corresponding "no-fly zones".
|
|
*/
|
|
static void return_all_reservations(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct rb_node *n;
|
|
struct gfs2_blkreserv *rs;
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
while ((n = rb_first(&rgd->rd_rstree))) {
|
|
rs = rb_entry(n, struct gfs2_blkreserv, rs_node);
|
|
__rs_deltree(rs);
|
|
}
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
}
|
|
|
|
void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
|
|
{
|
|
struct rb_node *n;
|
|
struct gfs2_rgrpd *rgd;
|
|
struct gfs2_glock *gl;
|
|
|
|
while ((n = rb_first(&sdp->sd_rindex_tree))) {
|
|
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
|
|
gl = rgd->rd_gl;
|
|
|
|
rb_erase(n, &sdp->sd_rindex_tree);
|
|
|
|
if (gl) {
|
|
if (gl->gl_state != LM_ST_UNLOCKED) {
|
|
gfs2_glock_cb(gl, LM_ST_UNLOCKED);
|
|
flush_delayed_work(&gl->gl_work);
|
|
}
|
|
gfs2_rgrp_brelse(rgd);
|
|
glock_clear_object(gl, rgd);
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
gfs2_free_clones(rgd);
|
|
return_all_reservations(rgd);
|
|
kfree(rgd->rd_bits);
|
|
rgd->rd_bits = NULL;
|
|
kmem_cache_free(gfs2_rgrpd_cachep, rgd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* compute_bitstructs - Compute the bitmap sizes
|
|
* @rgd: The resource group descriptor
|
|
*
|
|
* Calculates bitmap descriptors, one for each block that contains bitmap data
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int compute_bitstructs(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
struct gfs2_bitmap *bi;
|
|
u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
|
|
u32 bytes_left, bytes;
|
|
int x;
|
|
|
|
if (!length)
|
|
return -EINVAL;
|
|
|
|
rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
|
|
if (!rgd->rd_bits)
|
|
return -ENOMEM;
|
|
|
|
bytes_left = rgd->rd_bitbytes;
|
|
|
|
for (x = 0; x < length; x++) {
|
|
bi = rgd->rd_bits + x;
|
|
|
|
bi->bi_flags = 0;
|
|
/* small rgrp; bitmap stored completely in header block */
|
|
if (length == 1) {
|
|
bytes = bytes_left;
|
|
bi->bi_offset = sizeof(struct gfs2_rgrp);
|
|
bi->bi_start = 0;
|
|
bi->bi_bytes = bytes;
|
|
bi->bi_blocks = bytes * GFS2_NBBY;
|
|
/* header block */
|
|
} else if (x == 0) {
|
|
bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
|
|
bi->bi_offset = sizeof(struct gfs2_rgrp);
|
|
bi->bi_start = 0;
|
|
bi->bi_bytes = bytes;
|
|
bi->bi_blocks = bytes * GFS2_NBBY;
|
|
/* last block */
|
|
} else if (x + 1 == length) {
|
|
bytes = bytes_left;
|
|
bi->bi_offset = sizeof(struct gfs2_meta_header);
|
|
bi->bi_start = rgd->rd_bitbytes - bytes_left;
|
|
bi->bi_bytes = bytes;
|
|
bi->bi_blocks = bytes * GFS2_NBBY;
|
|
/* other blocks */
|
|
} else {
|
|
bytes = sdp->sd_sb.sb_bsize -
|
|
sizeof(struct gfs2_meta_header);
|
|
bi->bi_offset = sizeof(struct gfs2_meta_header);
|
|
bi->bi_start = rgd->rd_bitbytes - bytes_left;
|
|
bi->bi_bytes = bytes;
|
|
bi->bi_blocks = bytes * GFS2_NBBY;
|
|
}
|
|
|
|
bytes_left -= bytes;
|
|
}
|
|
|
|
if (bytes_left) {
|
|
gfs2_consist_rgrpd(rgd);
|
|
return -EIO;
|
|
}
|
|
bi = rgd->rd_bits + (length - 1);
|
|
if ((bi->bi_start + bi->bi_bytes) * GFS2_NBBY != rgd->rd_data) {
|
|
gfs2_lm(sdp,
|
|
"ri_addr = %llu\n"
|
|
"ri_length = %u\n"
|
|
"ri_data0 = %llu\n"
|
|
"ri_data = %u\n"
|
|
"ri_bitbytes = %u\n"
|
|
"start=%u len=%u offset=%u\n",
|
|
(unsigned long long)rgd->rd_addr,
|
|
rgd->rd_length,
|
|
(unsigned long long)rgd->rd_data0,
|
|
rgd->rd_data,
|
|
rgd->rd_bitbytes,
|
|
bi->bi_start, bi->bi_bytes, bi->bi_offset);
|
|
gfs2_consist_rgrpd(rgd);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_ri_total - Total up the file system space, according to the rindex.
|
|
* @sdp: the filesystem
|
|
*
|
|
*/
|
|
u64 gfs2_ri_total(struct gfs2_sbd *sdp)
|
|
{
|
|
u64 total_data = 0;
|
|
struct inode *inode = sdp->sd_rindex;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
char buf[sizeof(struct gfs2_rindex)];
|
|
int error, rgrps;
|
|
|
|
for (rgrps = 0;; rgrps++) {
|
|
loff_t pos = rgrps * sizeof(struct gfs2_rindex);
|
|
|
|
if (pos + sizeof(struct gfs2_rindex) > i_size_read(inode))
|
|
break;
|
|
error = gfs2_internal_read(ip, buf, &pos,
|
|
sizeof(struct gfs2_rindex));
|
|
if (error != sizeof(struct gfs2_rindex))
|
|
break;
|
|
total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
|
|
}
|
|
return total_data;
|
|
}
|
|
|
|
static int rgd_insert(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
struct rb_node **newn = &sdp->sd_rindex_tree.rb_node, *parent = NULL;
|
|
|
|
/* Figure out where to put new node */
|
|
while (*newn) {
|
|
struct gfs2_rgrpd *cur = rb_entry(*newn, struct gfs2_rgrpd,
|
|
rd_node);
|
|
|
|
parent = *newn;
|
|
if (rgd->rd_addr < cur->rd_addr)
|
|
newn = &((*newn)->rb_left);
|
|
else if (rgd->rd_addr > cur->rd_addr)
|
|
newn = &((*newn)->rb_right);
|
|
else
|
|
return -EEXIST;
|
|
}
|
|
|
|
rb_link_node(&rgd->rd_node, parent, newn);
|
|
rb_insert_color(&rgd->rd_node, &sdp->sd_rindex_tree);
|
|
sdp->sd_rgrps++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* read_rindex_entry - Pull in a new resource index entry from the disk
|
|
* @ip: Pointer to the rindex inode
|
|
*
|
|
* Returns: 0 on success, > 0 on EOF, error code otherwise
|
|
*/
|
|
|
|
static int read_rindex_entry(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
|
|
struct gfs2_rindex buf;
|
|
int error;
|
|
struct gfs2_rgrpd *rgd;
|
|
|
|
if (pos >= i_size_read(&ip->i_inode))
|
|
return 1;
|
|
|
|
error = gfs2_internal_read(ip, (char *)&buf, &pos,
|
|
sizeof(struct gfs2_rindex));
|
|
|
|
if (error != sizeof(struct gfs2_rindex))
|
|
return (error == 0) ? 1 : error;
|
|
|
|
rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
|
|
error = -ENOMEM;
|
|
if (!rgd)
|
|
return error;
|
|
|
|
rgd->rd_sbd = sdp;
|
|
rgd->rd_addr = be64_to_cpu(buf.ri_addr);
|
|
rgd->rd_length = be32_to_cpu(buf.ri_length);
|
|
rgd->rd_data0 = be64_to_cpu(buf.ri_data0);
|
|
rgd->rd_data = be32_to_cpu(buf.ri_data);
|
|
rgd->rd_bitbytes = be32_to_cpu(buf.ri_bitbytes);
|
|
spin_lock_init(&rgd->rd_rsspin);
|
|
mutex_init(&rgd->rd_mutex);
|
|
|
|
error = compute_bitstructs(rgd);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = gfs2_glock_get(sdp, rgd->rd_addr,
|
|
&gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
|
|
if (error)
|
|
goto fail;
|
|
|
|
rgd->rd_rgl = (struct gfs2_rgrp_lvb *)rgd->rd_gl->gl_lksb.sb_lvbptr;
|
|
rgd->rd_flags &= ~(GFS2_RDF_UPTODATE | GFS2_RDF_PREFERRED);
|
|
if (rgd->rd_data > sdp->sd_max_rg_data)
|
|
sdp->sd_max_rg_data = rgd->rd_data;
|
|
spin_lock(&sdp->sd_rindex_spin);
|
|
error = rgd_insert(rgd);
|
|
spin_unlock(&sdp->sd_rindex_spin);
|
|
if (!error) {
|
|
glock_set_object(rgd->rd_gl, rgd);
|
|
return 0;
|
|
}
|
|
|
|
error = 0; /* someone else read in the rgrp; free it and ignore it */
|
|
gfs2_glock_put(rgd->rd_gl);
|
|
|
|
fail:
|
|
kfree(rgd->rd_bits);
|
|
rgd->rd_bits = NULL;
|
|
kmem_cache_free(gfs2_rgrpd_cachep, rgd);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* set_rgrp_preferences - Run all the rgrps, selecting some we prefer to use
|
|
* @sdp: the GFS2 superblock
|
|
*
|
|
* The purpose of this function is to select a subset of the resource groups
|
|
* and mark them as PREFERRED. We do it in such a way that each node prefers
|
|
* to use a unique set of rgrps to minimize glock contention.
|
|
*/
|
|
static void set_rgrp_preferences(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_rgrpd *rgd, *first;
|
|
int i;
|
|
|
|
/* Skip an initial number of rgrps, based on this node's journal ID.
|
|
That should start each node out on its own set. */
|
|
rgd = gfs2_rgrpd_get_first(sdp);
|
|
for (i = 0; i < sdp->sd_lockstruct.ls_jid; i++)
|
|
rgd = gfs2_rgrpd_get_next(rgd);
|
|
first = rgd;
|
|
|
|
do {
|
|
rgd->rd_flags |= GFS2_RDF_PREFERRED;
|
|
for (i = 0; i < sdp->sd_journals; i++) {
|
|
rgd = gfs2_rgrpd_get_next(rgd);
|
|
if (!rgd || rgd == first)
|
|
break;
|
|
}
|
|
} while (rgd && rgd != first);
|
|
}
|
|
|
|
/**
|
|
* gfs2_ri_update - Pull in a new resource index from the disk
|
|
* @ip: pointer to the rindex inode
|
|
*
|
|
* Returns: 0 on successful update, error code otherwise
|
|
*/
|
|
|
|
static int gfs2_ri_update(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
int error;
|
|
|
|
do {
|
|
error = read_rindex_entry(ip);
|
|
} while (error == 0);
|
|
|
|
if (error < 0)
|
|
return error;
|
|
|
|
if (RB_EMPTY_ROOT(&sdp->sd_rindex_tree)) {
|
|
fs_err(sdp, "no resource groups found in the file system.\n");
|
|
return -ENOENT;
|
|
}
|
|
set_rgrp_preferences(sdp);
|
|
|
|
sdp->sd_rindex_uptodate = 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rindex_update - Update the rindex if required
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* We grab a lock on the rindex inode to make sure that it doesn't
|
|
* change whilst we are performing an operation. We keep this lock
|
|
* for quite long periods of time compared to other locks. This
|
|
* doesn't matter, since it is shared and it is very, very rarely
|
|
* accessed in the exclusive mode (i.e. only when expanding the filesystem).
|
|
*
|
|
* This makes sure that we're using the latest copy of the resource index
|
|
* special file, which might have been updated if someone expanded the
|
|
* filesystem (via gfs2_grow utility), which adds new resource groups.
|
|
*
|
|
* Returns: 0 on succeess, error code otherwise
|
|
*/
|
|
|
|
int gfs2_rindex_update(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
|
|
struct gfs2_glock *gl = ip->i_gl;
|
|
struct gfs2_holder ri_gh;
|
|
int error = 0;
|
|
int unlock_required = 0;
|
|
|
|
/* Read new copy from disk if we don't have the latest */
|
|
if (!sdp->sd_rindex_uptodate) {
|
|
if (!gfs2_glock_is_locked_by_me(gl)) {
|
|
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh);
|
|
if (error)
|
|
return error;
|
|
unlock_required = 1;
|
|
}
|
|
if (!sdp->sd_rindex_uptodate)
|
|
error = gfs2_ri_update(ip);
|
|
if (unlock_required)
|
|
gfs2_glock_dq_uninit(&ri_gh);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
|
|
{
|
|
const struct gfs2_rgrp *str = buf;
|
|
u32 rg_flags;
|
|
|
|
rg_flags = be32_to_cpu(str->rg_flags);
|
|
rg_flags &= ~GFS2_RDF_MASK;
|
|
rgd->rd_flags &= GFS2_RDF_MASK;
|
|
rgd->rd_flags |= rg_flags;
|
|
rgd->rd_free = be32_to_cpu(str->rg_free);
|
|
rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
|
|
rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
|
|
/* rd_data0, rd_data and rd_bitbytes already set from rindex */
|
|
}
|
|
|
|
static void gfs2_rgrp_ondisk2lvb(struct gfs2_rgrp_lvb *rgl, const void *buf)
|
|
{
|
|
const struct gfs2_rgrp *str = buf;
|
|
|
|
rgl->rl_magic = cpu_to_be32(GFS2_MAGIC);
|
|
rgl->rl_flags = str->rg_flags;
|
|
rgl->rl_free = str->rg_free;
|
|
rgl->rl_dinodes = str->rg_dinodes;
|
|
rgl->rl_igeneration = str->rg_igeneration;
|
|
rgl->__pad = 0UL;
|
|
}
|
|
|
|
static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
|
|
{
|
|
struct gfs2_rgrpd *next = gfs2_rgrpd_get_next(rgd);
|
|
struct gfs2_rgrp *str = buf;
|
|
u32 crc;
|
|
|
|
str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
|
|
str->rg_free = cpu_to_be32(rgd->rd_free);
|
|
str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
|
|
if (next == NULL)
|
|
str->rg_skip = 0;
|
|
else if (next->rd_addr > rgd->rd_addr)
|
|
str->rg_skip = cpu_to_be32(next->rd_addr - rgd->rd_addr);
|
|
str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
|
|
str->rg_data0 = cpu_to_be64(rgd->rd_data0);
|
|
str->rg_data = cpu_to_be32(rgd->rd_data);
|
|
str->rg_bitbytes = cpu_to_be32(rgd->rd_bitbytes);
|
|
str->rg_crc = 0;
|
|
crc = gfs2_disk_hash(buf, sizeof(struct gfs2_rgrp));
|
|
str->rg_crc = cpu_to_be32(crc);
|
|
|
|
memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
|
|
gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, buf);
|
|
}
|
|
|
|
static int gfs2_rgrp_lvb_valid(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
|
|
struct gfs2_rgrp *str = (struct gfs2_rgrp *)rgd->rd_bits[0].bi_bh->b_data;
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
int valid = 1;
|
|
|
|
if (rgl->rl_flags != str->rg_flags) {
|
|
fs_warn(sdp, "GFS2: rgd: %llu lvb flag mismatch %u/%u",
|
|
(unsigned long long)rgd->rd_addr,
|
|
be32_to_cpu(rgl->rl_flags), be32_to_cpu(str->rg_flags));
|
|
valid = 0;
|
|
}
|
|
if (rgl->rl_free != str->rg_free) {
|
|
fs_warn(sdp, "GFS2: rgd: %llu lvb free mismatch %u/%u",
|
|
(unsigned long long)rgd->rd_addr,
|
|
be32_to_cpu(rgl->rl_free), be32_to_cpu(str->rg_free));
|
|
valid = 0;
|
|
}
|
|
if (rgl->rl_dinodes != str->rg_dinodes) {
|
|
fs_warn(sdp, "GFS2: rgd: %llu lvb dinode mismatch %u/%u",
|
|
(unsigned long long)rgd->rd_addr,
|
|
be32_to_cpu(rgl->rl_dinodes),
|
|
be32_to_cpu(str->rg_dinodes));
|
|
valid = 0;
|
|
}
|
|
if (rgl->rl_igeneration != str->rg_igeneration) {
|
|
fs_warn(sdp, "GFS2: rgd: %llu lvb igen mismatch %llu/%llu",
|
|
(unsigned long long)rgd->rd_addr,
|
|
(unsigned long long)be64_to_cpu(rgl->rl_igeneration),
|
|
(unsigned long long)be64_to_cpu(str->rg_igeneration));
|
|
valid = 0;
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
static u32 count_unlinked(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_bitmap *bi;
|
|
const u32 length = rgd->rd_length;
|
|
const u8 *buffer = NULL;
|
|
u32 i, goal, count = 0;
|
|
|
|
for (i = 0, bi = rgd->rd_bits; i < length; i++, bi++) {
|
|
goal = 0;
|
|
buffer = bi->bi_bh->b_data + bi->bi_offset;
|
|
WARN_ON(!buffer_uptodate(bi->bi_bh));
|
|
while (goal < bi->bi_blocks) {
|
|
goal = gfs2_bitfit(buffer, bi->bi_bytes, goal,
|
|
GFS2_BLKST_UNLINKED);
|
|
if (goal == BFITNOENT)
|
|
break;
|
|
count++;
|
|
goal++;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static void rgrp_set_bitmap_flags(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_bitmap *bi;
|
|
int x;
|
|
|
|
if (rgd->rd_free) {
|
|
for (x = 0; x < rgd->rd_length; x++) {
|
|
bi = rgd->rd_bits + x;
|
|
clear_bit(GBF_FULL, &bi->bi_flags);
|
|
}
|
|
} else {
|
|
for (x = 0; x < rgd->rd_length; x++) {
|
|
bi = rgd->rd_bits + x;
|
|
set_bit(GBF_FULL, &bi->bi_flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
|
|
* @rgd: the struct gfs2_rgrpd describing the RG to read in
|
|
*
|
|
* Read in all of a Resource Group's header and bitmap blocks.
|
|
* Caller must eventually call gfs2_rgrp_brelse() to free the bitmaps.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
struct gfs2_glock *gl = rgd->rd_gl;
|
|
unsigned int length = rgd->rd_length;
|
|
struct gfs2_bitmap *bi;
|
|
unsigned int x, y;
|
|
int error;
|
|
|
|
if (rgd->rd_bits[0].bi_bh != NULL)
|
|
return 0;
|
|
|
|
for (x = 0; x < length; x++) {
|
|
bi = rgd->rd_bits + x;
|
|
error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, 0, &bi->bi_bh);
|
|
if (error)
|
|
goto fail;
|
|
}
|
|
|
|
for (y = length; y--;) {
|
|
bi = rgd->rd_bits + y;
|
|
error = gfs2_meta_wait(sdp, bi->bi_bh);
|
|
if (error)
|
|
goto fail;
|
|
if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
|
|
GFS2_METATYPE_RG)) {
|
|
error = -EIO;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
|
|
gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
|
|
rgrp_set_bitmap_flags(rgd);
|
|
rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
|
|
rgd->rd_free_clone = rgd->rd_free;
|
|
BUG_ON(rgd->rd_reserved);
|
|
/* max out the rgrp allocation failure point */
|
|
rgd->rd_extfail_pt = rgd->rd_free;
|
|
}
|
|
if (cpu_to_be32(GFS2_MAGIC) != rgd->rd_rgl->rl_magic) {
|
|
rgd->rd_rgl->rl_unlinked = cpu_to_be32(count_unlinked(rgd));
|
|
gfs2_rgrp_ondisk2lvb(rgd->rd_rgl,
|
|
rgd->rd_bits[0].bi_bh->b_data);
|
|
}
|
|
else if (sdp->sd_args.ar_rgrplvb) {
|
|
if (!gfs2_rgrp_lvb_valid(rgd)){
|
|
gfs2_consist_rgrpd(rgd);
|
|
error = -EIO;
|
|
goto fail;
|
|
}
|
|
if (rgd->rd_rgl->rl_unlinked == 0)
|
|
rgd->rd_flags &= ~GFS2_RDF_CHECK;
|
|
}
|
|
return 0;
|
|
|
|
fail:
|
|
while (x--) {
|
|
bi = rgd->rd_bits + x;
|
|
brelse(bi->bi_bh);
|
|
bi->bi_bh = NULL;
|
|
gfs2_assert_warn(sdp, !bi->bi_clone);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int update_rgrp_lvb(struct gfs2_rgrpd *rgd)
|
|
{
|
|
u32 rl_flags;
|
|
|
|
if (rgd->rd_flags & GFS2_RDF_UPTODATE)
|
|
return 0;
|
|
|
|
if (cpu_to_be32(GFS2_MAGIC) != rgd->rd_rgl->rl_magic)
|
|
return gfs2_rgrp_bh_get(rgd);
|
|
|
|
rl_flags = be32_to_cpu(rgd->rd_rgl->rl_flags);
|
|
rl_flags &= ~GFS2_RDF_MASK;
|
|
rgd->rd_flags &= GFS2_RDF_MASK;
|
|
rgd->rd_flags |= (rl_flags | GFS2_RDF_CHECK);
|
|
if (rgd->rd_rgl->rl_unlinked == 0)
|
|
rgd->rd_flags &= ~GFS2_RDF_CHECK;
|
|
rgd->rd_free = be32_to_cpu(rgd->rd_rgl->rl_free);
|
|
rgrp_set_bitmap_flags(rgd);
|
|
rgd->rd_free_clone = rgd->rd_free;
|
|
BUG_ON(rgd->rd_reserved);
|
|
/* max out the rgrp allocation failure point */
|
|
rgd->rd_extfail_pt = rgd->rd_free;
|
|
rgd->rd_dinodes = be32_to_cpu(rgd->rd_rgl->rl_dinodes);
|
|
rgd->rd_igeneration = be64_to_cpu(rgd->rd_rgl->rl_igeneration);
|
|
return 0;
|
|
}
|
|
|
|
int gfs2_rgrp_go_lock(struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object;
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
|
|
if (gh->gh_flags & GL_SKIP && sdp->sd_args.ar_rgrplvb)
|
|
return 0;
|
|
return gfs2_rgrp_bh_get(rgd);
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrp_brelse - Release RG bitmaps read in with gfs2_rgrp_bh_get()
|
|
* @rgd: The resource group
|
|
*
|
|
*/
|
|
|
|
void gfs2_rgrp_brelse(struct gfs2_rgrpd *rgd)
|
|
{
|
|
int x, length = rgd->rd_length;
|
|
|
|
for (x = 0; x < length; x++) {
|
|
struct gfs2_bitmap *bi = rgd->rd_bits + x;
|
|
if (bi->bi_bh) {
|
|
brelse(bi->bi_bh);
|
|
bi->bi_bh = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
|
|
struct buffer_head *bh,
|
|
const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed)
|
|
{
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
u64 blk;
|
|
sector_t start = 0;
|
|
sector_t nr_blks = 0;
|
|
int rv;
|
|
unsigned int x;
|
|
u32 trimmed = 0;
|
|
u8 diff;
|
|
|
|
for (x = 0; x < bi->bi_bytes; x++) {
|
|
const u8 *clone = bi->bi_clone ? bi->bi_clone : bi->bi_bh->b_data;
|
|
clone += bi->bi_offset;
|
|
clone += x;
|
|
if (bh) {
|
|
const u8 *orig = bh->b_data + bi->bi_offset + x;
|
|
diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
|
|
} else {
|
|
diff = ~(*clone | (*clone >> 1));
|
|
}
|
|
diff &= 0x55;
|
|
if (diff == 0)
|
|
continue;
|
|
blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
|
|
while(diff) {
|
|
if (diff & 1) {
|
|
if (nr_blks == 0)
|
|
goto start_new_extent;
|
|
if ((start + nr_blks) != blk) {
|
|
if (nr_blks >= minlen) {
|
|
rv = sb_issue_discard(sb,
|
|
start, nr_blks,
|
|
GFP_NOFS, 0);
|
|
if (rv)
|
|
goto fail;
|
|
trimmed += nr_blks;
|
|
}
|
|
nr_blks = 0;
|
|
start_new_extent:
|
|
start = blk;
|
|
}
|
|
nr_blks++;
|
|
}
|
|
diff >>= 2;
|
|
blk++;
|
|
}
|
|
}
|
|
if (nr_blks >= minlen) {
|
|
rv = sb_issue_discard(sb, start, nr_blks, GFP_NOFS, 0);
|
|
if (rv)
|
|
goto fail;
|
|
trimmed += nr_blks;
|
|
}
|
|
if (ptrimmed)
|
|
*ptrimmed = trimmed;
|
|
return 0;
|
|
|
|
fail:
|
|
if (sdp->sd_args.ar_discard)
|
|
fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem\n", rv);
|
|
sdp->sd_args.ar_discard = 0;
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* gfs2_fitrim - Generate discard requests for unused bits of the filesystem
|
|
* @filp: Any file on the filesystem
|
|
* @argp: Pointer to the arguments (also used to pass result)
|
|
*
|
|
* Returns: 0 on success, otherwise error code
|
|
*/
|
|
|
|
int gfs2_fitrim(struct file *filp, void __user *argp)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct request_queue *q = bdev_get_queue(sdp->sd_vfs->s_bdev);
|
|
struct buffer_head *bh;
|
|
struct gfs2_rgrpd *rgd;
|
|
struct gfs2_rgrpd *rgd_end;
|
|
struct gfs2_holder gh;
|
|
struct fstrim_range r;
|
|
int ret = 0;
|
|
u64 amt;
|
|
u64 trimmed = 0;
|
|
u64 start, end, minlen;
|
|
unsigned int x;
|
|
unsigned bs_shift = sdp->sd_sb.sb_bsize_shift;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
|
|
return -EROFS;
|
|
|
|
if (!blk_queue_discard(q))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (copy_from_user(&r, argp, sizeof(r)))
|
|
return -EFAULT;
|
|
|
|
ret = gfs2_rindex_update(sdp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
start = r.start >> bs_shift;
|
|
end = start + (r.len >> bs_shift);
|
|
minlen = max_t(u64, r.minlen,
|
|
q->limits.discard_granularity) >> bs_shift;
|
|
|
|
if (end <= start || minlen > sdp->sd_max_rg_data)
|
|
return -EINVAL;
|
|
|
|
rgd = gfs2_blk2rgrpd(sdp, start, 0);
|
|
rgd_end = gfs2_blk2rgrpd(sdp, end, 0);
|
|
|
|
if ((gfs2_rgrpd_get_first(sdp) == gfs2_rgrpd_get_next(rgd_end))
|
|
&& (start > rgd_end->rd_data0 + rgd_end->rd_data))
|
|
return -EINVAL; /* start is beyond the end of the fs */
|
|
|
|
while (1) {
|
|
|
|
ret = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
|
|
LM_FLAG_NODE_SCOPE, &gh);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (!(rgd->rd_flags & GFS2_RGF_TRIMMED)) {
|
|
/* Trim each bitmap in the rgrp */
|
|
for (x = 0; x < rgd->rd_length; x++) {
|
|
struct gfs2_bitmap *bi = rgd->rd_bits + x;
|
|
rgrp_lock_local(rgd);
|
|
ret = gfs2_rgrp_send_discards(sdp,
|
|
rgd->rd_data0, NULL, bi, minlen,
|
|
&amt);
|
|
rgrp_unlock_local(rgd);
|
|
if (ret) {
|
|
gfs2_glock_dq_uninit(&gh);
|
|
goto out;
|
|
}
|
|
trimmed += amt;
|
|
}
|
|
|
|
/* Mark rgrp as having been trimmed */
|
|
ret = gfs2_trans_begin(sdp, RES_RG_HDR, 0);
|
|
if (ret == 0) {
|
|
bh = rgd->rd_bits[0].bi_bh;
|
|
rgrp_lock_local(rgd);
|
|
rgd->rd_flags |= GFS2_RGF_TRIMMED;
|
|
gfs2_trans_add_meta(rgd->rd_gl, bh);
|
|
gfs2_rgrp_out(rgd, bh->b_data);
|
|
rgrp_unlock_local(rgd);
|
|
gfs2_trans_end(sdp);
|
|
}
|
|
}
|
|
gfs2_glock_dq_uninit(&gh);
|
|
|
|
if (rgd == rgd_end)
|
|
break;
|
|
|
|
rgd = gfs2_rgrpd_get_next(rgd);
|
|
}
|
|
|
|
out:
|
|
r.len = trimmed << bs_shift;
|
|
if (copy_to_user(argp, &r, sizeof(r)))
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rs_insert - insert a new multi-block reservation into the rgrp's rb_tree
|
|
* @ip: the inode structure
|
|
*
|
|
*/
|
|
static void rs_insert(struct gfs2_inode *ip)
|
|
{
|
|
struct rb_node **newn, *parent = NULL;
|
|
int rc;
|
|
struct gfs2_blkreserv *rs = &ip->i_res;
|
|
struct gfs2_rgrpd *rgd = rs->rs_rgd;
|
|
|
|
BUG_ON(gfs2_rs_active(rs));
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
newn = &rgd->rd_rstree.rb_node;
|
|
while (*newn) {
|
|
struct gfs2_blkreserv *cur =
|
|
rb_entry(*newn, struct gfs2_blkreserv, rs_node);
|
|
|
|
parent = *newn;
|
|
rc = rs_cmp(rs->rs_start, rs->rs_requested, cur);
|
|
if (rc > 0)
|
|
newn = &((*newn)->rb_right);
|
|
else if (rc < 0)
|
|
newn = &((*newn)->rb_left);
|
|
else {
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
rb_link_node(&rs->rs_node, parent, newn);
|
|
rb_insert_color(&rs->rs_node, &rgd->rd_rstree);
|
|
|
|
/* Do our rgrp accounting for the reservation */
|
|
rgd->rd_requested += rs->rs_requested; /* blocks requested */
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
trace_gfs2_rs(rs, TRACE_RS_INSERT);
|
|
}
|
|
|
|
/**
|
|
* rgd_free - return the number of free blocks we can allocate
|
|
* @rgd: the resource group
|
|
* @rs: The reservation to free
|
|
*
|
|
* This function returns the number of free blocks for an rgrp.
|
|
* That's the clone-free blocks (blocks that are free, not including those
|
|
* still being used for unlinked files that haven't been deleted.)
|
|
*
|
|
* It also subtracts any blocks reserved by someone else, but does not
|
|
* include free blocks that are still part of our current reservation,
|
|
* because obviously we can (and will) allocate them.
|
|
*/
|
|
static inline u32 rgd_free(struct gfs2_rgrpd *rgd, struct gfs2_blkreserv *rs)
|
|
{
|
|
u32 tot_reserved, tot_free;
|
|
|
|
if (WARN_ON_ONCE(rgd->rd_requested < rs->rs_requested))
|
|
return 0;
|
|
tot_reserved = rgd->rd_requested - rs->rs_requested;
|
|
|
|
if (rgd->rd_free_clone < tot_reserved)
|
|
tot_reserved = 0;
|
|
|
|
tot_free = rgd->rd_free_clone - tot_reserved;
|
|
|
|
return tot_free;
|
|
}
|
|
|
|
/**
|
|
* rg_mblk_search - find a group of multiple free blocks to form a reservation
|
|
* @rgd: the resource group descriptor
|
|
* @ip: pointer to the inode for which we're reserving blocks
|
|
* @ap: the allocation parameters
|
|
*
|
|
*/
|
|
|
|
static void rg_mblk_search(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip,
|
|
const struct gfs2_alloc_parms *ap)
|
|
{
|
|
struct gfs2_rbm rbm = { .rgd = rgd, };
|
|
u64 goal;
|
|
struct gfs2_blkreserv *rs = &ip->i_res;
|
|
u32 extlen;
|
|
u32 free_blocks, blocks_available;
|
|
int ret;
|
|
struct inode *inode = &ip->i_inode;
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
free_blocks = rgd_free(rgd, rs);
|
|
if (rgd->rd_free_clone < rgd->rd_requested)
|
|
free_blocks = 0;
|
|
blocks_available = rgd->rd_free_clone - rgd->rd_reserved;
|
|
if (rgd == rs->rs_rgd)
|
|
blocks_available += rs->rs_reserved;
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
extlen = 1;
|
|
else {
|
|
extlen = max_t(u32, atomic_read(&ip->i_sizehint), ap->target);
|
|
extlen = clamp(extlen, (u32)RGRP_RSRV_MINBLKS, free_blocks);
|
|
}
|
|
if (free_blocks < extlen || blocks_available < extlen)
|
|
return;
|
|
|
|
/* Find bitmap block that contains bits for goal block */
|
|
if (rgrp_contains_block(rgd, ip->i_goal))
|
|
goal = ip->i_goal;
|
|
else
|
|
goal = rgd->rd_last_alloc + rgd->rd_data0;
|
|
|
|
if (WARN_ON(gfs2_rbm_from_block(&rbm, goal)))
|
|
return;
|
|
|
|
ret = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, &extlen, &ip->i_res, true);
|
|
if (ret == 0) {
|
|
rs->rs_start = gfs2_rbm_to_block(&rbm);
|
|
rs->rs_requested = extlen;
|
|
rs_insert(ip);
|
|
} else {
|
|
if (goal == rgd->rd_last_alloc + rgd->rd_data0)
|
|
rgd->rd_last_alloc = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_next_unreserved_block - Return next block that is not reserved
|
|
* @rgd: The resource group
|
|
* @block: The starting block
|
|
* @length: The required length
|
|
* @ignore_rs: Reservation to ignore
|
|
*
|
|
* If the block does not appear in any reservation, then return the
|
|
* block number unchanged. If it does appear in the reservation, then
|
|
* keep looking through the tree of reservations in order to find the
|
|
* first block number which is not reserved.
|
|
*/
|
|
|
|
static u64 gfs2_next_unreserved_block(struct gfs2_rgrpd *rgd, u64 block,
|
|
u32 length,
|
|
struct gfs2_blkreserv *ignore_rs)
|
|
{
|
|
struct gfs2_blkreserv *rs;
|
|
struct rb_node *n;
|
|
int rc;
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
n = rgd->rd_rstree.rb_node;
|
|
while (n) {
|
|
rs = rb_entry(n, struct gfs2_blkreserv, rs_node);
|
|
rc = rs_cmp(block, length, rs);
|
|
if (rc < 0)
|
|
n = n->rb_left;
|
|
else if (rc > 0)
|
|
n = n->rb_right;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (n) {
|
|
while (rs_cmp(block, length, rs) == 0 && rs != ignore_rs) {
|
|
block = rs->rs_start + rs->rs_requested;
|
|
n = n->rb_right;
|
|
if (n == NULL)
|
|
break;
|
|
rs = rb_entry(n, struct gfs2_blkreserv, rs_node);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
return block;
|
|
}
|
|
|
|
/**
|
|
* gfs2_reservation_check_and_update - Check for reservations during block alloc
|
|
* @rbm: The current position in the resource group
|
|
* @rs: Our own reservation
|
|
* @minext: The minimum extent length
|
|
* @maxext: A pointer to the maximum extent structure
|
|
*
|
|
* This checks the current position in the rgrp to see whether there is
|
|
* a reservation covering this block. If not then this function is a
|
|
* no-op. If there is, then the position is moved to the end of the
|
|
* contiguous reservation(s) so that we are pointing at the first
|
|
* non-reserved block.
|
|
*
|
|
* Returns: 0 if no reservation, 1 if @rbm has changed, otherwise an error
|
|
*/
|
|
|
|
static int gfs2_reservation_check_and_update(struct gfs2_rbm *rbm,
|
|
struct gfs2_blkreserv *rs,
|
|
u32 minext,
|
|
struct gfs2_extent *maxext)
|
|
{
|
|
u64 block = gfs2_rbm_to_block(rbm);
|
|
u32 extlen = 1;
|
|
u64 nblock;
|
|
|
|
/*
|
|
* If we have a minimum extent length, then skip over any extent
|
|
* which is less than the min extent length in size.
|
|
*/
|
|
if (minext > 1) {
|
|
extlen = gfs2_free_extlen(rbm, minext);
|
|
if (extlen <= maxext->len)
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Check the extent which has been found against the reservations
|
|
* and skip if parts of it are already reserved
|
|
*/
|
|
nblock = gfs2_next_unreserved_block(rbm->rgd, block, extlen, rs);
|
|
if (nblock == block) {
|
|
if (!minext || extlen >= minext)
|
|
return 0;
|
|
|
|
if (extlen > maxext->len) {
|
|
maxext->len = extlen;
|
|
maxext->rbm = *rbm;
|
|
}
|
|
} else {
|
|
u64 len = nblock - block;
|
|
if (len >= (u64)1 << 32)
|
|
return -E2BIG;
|
|
extlen = len;
|
|
}
|
|
fail:
|
|
if (gfs2_rbm_add(rbm, extlen))
|
|
return -E2BIG;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rbm_find - Look for blocks of a particular state
|
|
* @rbm: Value/result starting position and final position
|
|
* @state: The state which we want to find
|
|
* @minext: Pointer to the requested extent length
|
|
* This is updated to be the actual reservation size.
|
|
* @rs: Our own reservation (NULL to skip checking for reservations)
|
|
* @nowrap: Stop looking at the end of the rgrp, rather than wrapping
|
|
* around until we've reached the starting point.
|
|
*
|
|
* Side effects:
|
|
* - If looking for free blocks, we set GBF_FULL on each bitmap which
|
|
* has no free blocks in it.
|
|
* - If looking for free blocks, we set rd_extfail_pt on each rgrp which
|
|
* has come up short on a free block search.
|
|
*
|
|
* Returns: 0 on success, -ENOSPC if there is no block of the requested state
|
|
*/
|
|
|
|
static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext,
|
|
struct gfs2_blkreserv *rs, bool nowrap)
|
|
{
|
|
bool scan_from_start = rbm->bii == 0 && rbm->offset == 0;
|
|
struct buffer_head *bh;
|
|
int last_bii;
|
|
u32 offset;
|
|
u8 *buffer;
|
|
bool wrapped = false;
|
|
int ret;
|
|
struct gfs2_bitmap *bi;
|
|
struct gfs2_extent maxext = { .rbm.rgd = rbm->rgd, };
|
|
|
|
/*
|
|
* Determine the last bitmap to search. If we're not starting at the
|
|
* beginning of a bitmap, we need to search that bitmap twice to scan
|
|
* the entire resource group.
|
|
*/
|
|
last_bii = rbm->bii - (rbm->offset == 0);
|
|
|
|
while(1) {
|
|
bi = rbm_bi(rbm);
|
|
if (test_bit(GBF_FULL, &bi->bi_flags) &&
|
|
(state == GFS2_BLKST_FREE))
|
|
goto next_bitmap;
|
|
|
|
bh = bi->bi_bh;
|
|
buffer = bh->b_data + bi->bi_offset;
|
|
WARN_ON(!buffer_uptodate(bh));
|
|
if (state != GFS2_BLKST_UNLINKED && bi->bi_clone)
|
|
buffer = bi->bi_clone + bi->bi_offset;
|
|
offset = gfs2_bitfit(buffer, bi->bi_bytes, rbm->offset, state);
|
|
if (offset == BFITNOENT) {
|
|
if (state == GFS2_BLKST_FREE && rbm->offset == 0)
|
|
set_bit(GBF_FULL, &bi->bi_flags);
|
|
goto next_bitmap;
|
|
}
|
|
rbm->offset = offset;
|
|
if (!rs || !minext)
|
|
return 0;
|
|
|
|
ret = gfs2_reservation_check_and_update(rbm, rs, *minext,
|
|
&maxext);
|
|
if (ret == 0)
|
|
return 0;
|
|
if (ret > 0)
|
|
goto next_iter;
|
|
if (ret == -E2BIG) {
|
|
rbm->bii = 0;
|
|
rbm->offset = 0;
|
|
goto res_covered_end_of_rgrp;
|
|
}
|
|
return ret;
|
|
|
|
next_bitmap: /* Find next bitmap in the rgrp */
|
|
rbm->offset = 0;
|
|
rbm->bii++;
|
|
if (rbm->bii == rbm->rgd->rd_length)
|
|
rbm->bii = 0;
|
|
res_covered_end_of_rgrp:
|
|
if (rbm->bii == 0) {
|
|
if (wrapped)
|
|
break;
|
|
wrapped = true;
|
|
if (nowrap)
|
|
break;
|
|
}
|
|
next_iter:
|
|
/* Have we scanned the entire resource group? */
|
|
if (wrapped && rbm->bii > last_bii)
|
|
break;
|
|
}
|
|
|
|
if (state != GFS2_BLKST_FREE)
|
|
return -ENOSPC;
|
|
|
|
/* If the extent was too small, and it's smaller than the smallest
|
|
to have failed before, remember for future reference that it's
|
|
useless to search this rgrp again for this amount or more. */
|
|
if (wrapped && (scan_from_start || rbm->bii > last_bii) &&
|
|
*minext < rbm->rgd->rd_extfail_pt)
|
|
rbm->rgd->rd_extfail_pt = *minext - 1;
|
|
|
|
/* If the maximum extent we found is big enough to fulfill the
|
|
minimum requirements, use it anyway. */
|
|
if (maxext.len) {
|
|
*rbm = maxext.rbm;
|
|
*minext = maxext.len;
|
|
return 0;
|
|
}
|
|
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/**
|
|
* try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
|
|
* @rgd: The rgrp
|
|
* @last_unlinked: block address of the last dinode we unlinked
|
|
* @skip: block address we should explicitly not unlink
|
|
*
|
|
* Returns: 0 if no error
|
|
* The inode, if one has been found, in inode.
|
|
*/
|
|
|
|
static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip)
|
|
{
|
|
u64 block;
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
struct gfs2_glock *gl;
|
|
struct gfs2_inode *ip;
|
|
int error;
|
|
int found = 0;
|
|
struct gfs2_rbm rbm = { .rgd = rgd, .bii = 0, .offset = 0 };
|
|
|
|
while (1) {
|
|
error = gfs2_rbm_find(&rbm, GFS2_BLKST_UNLINKED, NULL, NULL,
|
|
true);
|
|
if (error == -ENOSPC)
|
|
break;
|
|
if (WARN_ON_ONCE(error))
|
|
break;
|
|
|
|
block = gfs2_rbm_to_block(&rbm);
|
|
if (gfs2_rbm_from_block(&rbm, block + 1))
|
|
break;
|
|
if (*last_unlinked != NO_BLOCK && block <= *last_unlinked)
|
|
continue;
|
|
if (block == skip)
|
|
continue;
|
|
*last_unlinked = block;
|
|
|
|
error = gfs2_glock_get(sdp, block, &gfs2_iopen_glops, CREATE, &gl);
|
|
if (error)
|
|
continue;
|
|
|
|
/* If the inode is already in cache, we can ignore it here
|
|
* because the existing inode disposal code will deal with
|
|
* it when all refs have gone away. Accessing gl_object like
|
|
* this is not safe in general. Here it is ok because we do
|
|
* not dereference the pointer, and we only need an approx
|
|
* answer to whether it is NULL or not.
|
|
*/
|
|
ip = gl->gl_object;
|
|
|
|
if (ip || !gfs2_queue_delete_work(gl, 0))
|
|
gfs2_glock_put(gl);
|
|
else
|
|
found++;
|
|
|
|
/* Limit reclaim to sensible number of tasks */
|
|
if (found > NR_CPUS)
|
|
return;
|
|
}
|
|
|
|
rgd->rd_flags &= ~GFS2_RDF_CHECK;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrp_congested - Use stats to figure out whether an rgrp is congested
|
|
* @rgd: The rgrp in question
|
|
* @loops: An indication of how picky we can be (0=very, 1=less so)
|
|
*
|
|
* This function uses the recently added glock statistics in order to
|
|
* figure out whether a parciular resource group is suffering from
|
|
* contention from multiple nodes. This is done purely on the basis
|
|
* of timings, since this is the only data we have to work with and
|
|
* our aim here is to reject a resource group which is highly contended
|
|
* but (very important) not to do this too often in order to ensure that
|
|
* we do not land up introducing fragmentation by changing resource
|
|
* groups when not actually required.
|
|
*
|
|
* The calculation is fairly simple, we want to know whether the SRTTB
|
|
* (i.e. smoothed round trip time for blocking operations) to acquire
|
|
* the lock for this rgrp's glock is significantly greater than the
|
|
* time taken for resource groups on average. We introduce a margin in
|
|
* the form of the variable @var which is computed as the sum of the two
|
|
* respective variences, and multiplied by a factor depending on @loops
|
|
* and whether we have a lot of data to base the decision on. This is
|
|
* then tested against the square difference of the means in order to
|
|
* decide whether the result is statistically significant or not.
|
|
*
|
|
* Returns: A boolean verdict on the congestion status
|
|
*/
|
|
|
|
static bool gfs2_rgrp_congested(const struct gfs2_rgrpd *rgd, int loops)
|
|
{
|
|
const struct gfs2_glock *gl = rgd->rd_gl;
|
|
const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct gfs2_lkstats *st;
|
|
u64 r_dcount, l_dcount;
|
|
u64 l_srttb, a_srttb = 0;
|
|
s64 srttb_diff;
|
|
u64 sqr_diff;
|
|
u64 var;
|
|
int cpu, nonzero = 0;
|
|
|
|
preempt_disable();
|
|
for_each_present_cpu(cpu) {
|
|
st = &per_cpu_ptr(sdp->sd_lkstats, cpu)->lkstats[LM_TYPE_RGRP];
|
|
if (st->stats[GFS2_LKS_SRTTB]) {
|
|
a_srttb += st->stats[GFS2_LKS_SRTTB];
|
|
nonzero++;
|
|
}
|
|
}
|
|
st = &this_cpu_ptr(sdp->sd_lkstats)->lkstats[LM_TYPE_RGRP];
|
|
if (nonzero)
|
|
do_div(a_srttb, nonzero);
|
|
r_dcount = st->stats[GFS2_LKS_DCOUNT];
|
|
var = st->stats[GFS2_LKS_SRTTVARB] +
|
|
gl->gl_stats.stats[GFS2_LKS_SRTTVARB];
|
|
preempt_enable();
|
|
|
|
l_srttb = gl->gl_stats.stats[GFS2_LKS_SRTTB];
|
|
l_dcount = gl->gl_stats.stats[GFS2_LKS_DCOUNT];
|
|
|
|
if ((l_dcount < 1) || (r_dcount < 1) || (a_srttb == 0))
|
|
return false;
|
|
|
|
srttb_diff = a_srttb - l_srttb;
|
|
sqr_diff = srttb_diff * srttb_diff;
|
|
|
|
var *= 2;
|
|
if (l_dcount < 8 || r_dcount < 8)
|
|
var *= 2;
|
|
if (loops == 1)
|
|
var *= 2;
|
|
|
|
return ((srttb_diff < 0) && (sqr_diff > var));
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrp_used_recently
|
|
* @rs: The block reservation with the rgrp to test
|
|
* @msecs: The time limit in milliseconds
|
|
*
|
|
* Returns: True if the rgrp glock has been used within the time limit
|
|
*/
|
|
static bool gfs2_rgrp_used_recently(const struct gfs2_blkreserv *rs,
|
|
u64 msecs)
|
|
{
|
|
u64 tdiff;
|
|
|
|
tdiff = ktime_to_ns(ktime_sub(ktime_get_real(),
|
|
rs->rs_rgd->rd_gl->gl_dstamp));
|
|
|
|
return tdiff > (msecs * 1000 * 1000);
|
|
}
|
|
|
|
static u32 gfs2_orlov_skip(const struct gfs2_inode *ip)
|
|
{
|
|
const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
u32 skip;
|
|
|
|
get_random_bytes(&skip, sizeof(skip));
|
|
return skip % sdp->sd_rgrps;
|
|
}
|
|
|
|
static bool gfs2_select_rgrp(struct gfs2_rgrpd **pos, const struct gfs2_rgrpd *begin)
|
|
{
|
|
struct gfs2_rgrpd *rgd = *pos;
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
|
|
rgd = gfs2_rgrpd_get_next(rgd);
|
|
if (rgd == NULL)
|
|
rgd = gfs2_rgrpd_get_first(sdp);
|
|
*pos = rgd;
|
|
if (rgd != begin) /* If we didn't wrap */
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* fast_to_acquire - determine if a resource group will be fast to acquire
|
|
* @rgd: The rgrp
|
|
*
|
|
* If this is one of our preferred rgrps, it should be quicker to acquire,
|
|
* because we tried to set ourselves up as dlm lock master.
|
|
*/
|
|
static inline int fast_to_acquire(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_glock *gl = rgd->rd_gl;
|
|
|
|
if (gl->gl_state != LM_ST_UNLOCKED && list_empty(&gl->gl_holders) &&
|
|
!test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) &&
|
|
!test_bit(GLF_DEMOTE, &gl->gl_flags))
|
|
return 1;
|
|
if (rgd->rd_flags & GFS2_RDF_PREFERRED)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_inplace_reserve - Reserve space in the filesystem
|
|
* @ip: the inode to reserve space for
|
|
* @ap: the allocation parameters
|
|
*
|
|
* We try our best to find an rgrp that has at least ap->target blocks
|
|
* available. After a couple of passes (loops == 2), the prospects of finding
|
|
* such an rgrp diminish. At this stage, we return the first rgrp that has
|
|
* at least ap->min_target blocks available.
|
|
*
|
|
* Returns: 0 on success,
|
|
* -ENOMEM if a suitable rgrp can't be found
|
|
* errno otherwise
|
|
*/
|
|
|
|
int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct gfs2_rgrpd *begin = NULL;
|
|
struct gfs2_blkreserv *rs = &ip->i_res;
|
|
int error = 0, flags = LM_FLAG_NODE_SCOPE;
|
|
bool rg_locked;
|
|
u64 last_unlinked = NO_BLOCK;
|
|
u32 target = ap->target;
|
|
int loops = 0;
|
|
u32 free_blocks, blocks_available, skip = 0;
|
|
|
|
BUG_ON(rs->rs_reserved);
|
|
|
|
if (sdp->sd_args.ar_rgrplvb)
|
|
flags |= GL_SKIP;
|
|
if (gfs2_assert_warn(sdp, target))
|
|
return -EINVAL;
|
|
if (gfs2_rs_active(rs)) {
|
|
begin = rs->rs_rgd;
|
|
} else if (rs->rs_rgd &&
|
|
rgrp_contains_block(rs->rs_rgd, ip->i_goal)) {
|
|
begin = rs->rs_rgd;
|
|
} else {
|
|
check_and_update_goal(ip);
|
|
rs->rs_rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
|
|
}
|
|
if (S_ISDIR(ip->i_inode.i_mode) && (ap->aflags & GFS2_AF_ORLOV))
|
|
skip = gfs2_orlov_skip(ip);
|
|
if (rs->rs_rgd == NULL)
|
|
return -EBADSLT;
|
|
|
|
while (loops < 3) {
|
|
struct gfs2_rgrpd *rgd;
|
|
|
|
rg_locked = gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl);
|
|
if (rg_locked) {
|
|
rgrp_lock_local(rs->rs_rgd);
|
|
} else {
|
|
if (skip && skip--)
|
|
goto next_rgrp;
|
|
if (!gfs2_rs_active(rs)) {
|
|
if (loops == 0 &&
|
|
!fast_to_acquire(rs->rs_rgd))
|
|
goto next_rgrp;
|
|
if ((loops < 2) &&
|
|
gfs2_rgrp_used_recently(rs, 1000) &&
|
|
gfs2_rgrp_congested(rs->rs_rgd, loops))
|
|
goto next_rgrp;
|
|
}
|
|
error = gfs2_glock_nq_init(rs->rs_rgd->rd_gl,
|
|
LM_ST_EXCLUSIVE, flags,
|
|
&ip->i_rgd_gh);
|
|
if (unlikely(error))
|
|
return error;
|
|
rgrp_lock_local(rs->rs_rgd);
|
|
if (!gfs2_rs_active(rs) && (loops < 2) &&
|
|
gfs2_rgrp_congested(rs->rs_rgd, loops))
|
|
goto skip_rgrp;
|
|
if (sdp->sd_args.ar_rgrplvb) {
|
|
error = update_rgrp_lvb(rs->rs_rgd);
|
|
if (unlikely(error)) {
|
|
rgrp_unlock_local(rs->rs_rgd);
|
|
gfs2_glock_dq_uninit(&ip->i_rgd_gh);
|
|
return error;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Skip unusable resource groups */
|
|
if ((rs->rs_rgd->rd_flags & (GFS2_RGF_NOALLOC |
|
|
GFS2_RDF_ERROR)) ||
|
|
(loops == 0 && target > rs->rs_rgd->rd_extfail_pt))
|
|
goto skip_rgrp;
|
|
|
|
if (sdp->sd_args.ar_rgrplvb)
|
|
gfs2_rgrp_bh_get(rs->rs_rgd);
|
|
|
|
/* Get a reservation if we don't already have one */
|
|
if (!gfs2_rs_active(rs))
|
|
rg_mblk_search(rs->rs_rgd, ip, ap);
|
|
|
|
/* Skip rgrps when we can't get a reservation on first pass */
|
|
if (!gfs2_rs_active(rs) && (loops < 1))
|
|
goto check_rgrp;
|
|
|
|
/* If rgrp has enough free space, use it */
|
|
rgd = rs->rs_rgd;
|
|
spin_lock(&rgd->rd_rsspin);
|
|
free_blocks = rgd_free(rgd, rs);
|
|
blocks_available = rgd->rd_free_clone - rgd->rd_reserved;
|
|
if (free_blocks < target || blocks_available < target) {
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
goto check_rgrp;
|
|
}
|
|
rs->rs_reserved = ap->target;
|
|
if (rs->rs_reserved > blocks_available)
|
|
rs->rs_reserved = blocks_available;
|
|
rgd->rd_reserved += rs->rs_reserved;
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
rgrp_unlock_local(rs->rs_rgd);
|
|
return 0;
|
|
check_rgrp:
|
|
/* Check for unlinked inodes which can be reclaimed */
|
|
if (rs->rs_rgd->rd_flags & GFS2_RDF_CHECK)
|
|
try_rgrp_unlink(rs->rs_rgd, &last_unlinked,
|
|
ip->i_no_addr);
|
|
skip_rgrp:
|
|
rgrp_unlock_local(rs->rs_rgd);
|
|
|
|
/* Drop reservation, if we couldn't use reserved rgrp */
|
|
if (gfs2_rs_active(rs))
|
|
gfs2_rs_deltree(rs);
|
|
|
|
/* Unlock rgrp if required */
|
|
if (!rg_locked)
|
|
gfs2_glock_dq_uninit(&ip->i_rgd_gh);
|
|
next_rgrp:
|
|
/* Find the next rgrp, and continue looking */
|
|
if (gfs2_select_rgrp(&rs->rs_rgd, begin))
|
|
continue;
|
|
if (skip)
|
|
continue;
|
|
|
|
/* If we've scanned all the rgrps, but found no free blocks
|
|
* then this checks for some less likely conditions before
|
|
* trying again.
|
|
*/
|
|
loops++;
|
|
/* Check that fs hasn't grown if writing to rindex */
|
|
if (ip == GFS2_I(sdp->sd_rindex) && !sdp->sd_rindex_uptodate) {
|
|
error = gfs2_ri_update(ip);
|
|
if (error)
|
|
return error;
|
|
}
|
|
/* Flushing the log may release space */
|
|
if (loops == 2) {
|
|
if (ap->min_target)
|
|
target = ap->min_target;
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
|
|
GFS2_LFC_INPLACE_RESERVE);
|
|
}
|
|
}
|
|
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/**
|
|
* gfs2_inplace_release - release an inplace reservation
|
|
* @ip: the inode the reservation was taken out on
|
|
*
|
|
* Release a reservation made by gfs2_inplace_reserve().
|
|
*/
|
|
|
|
void gfs2_inplace_release(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_blkreserv *rs = &ip->i_res;
|
|
|
|
if (rs->rs_reserved) {
|
|
struct gfs2_rgrpd *rgd = rs->rs_rgd;
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
BUG_ON(rgd->rd_reserved < rs->rs_reserved);
|
|
rgd->rd_reserved -= rs->rs_reserved;
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
rs->rs_reserved = 0;
|
|
}
|
|
if (gfs2_holder_initialized(&ip->i_rgd_gh))
|
|
gfs2_glock_dq_uninit(&ip->i_rgd_gh);
|
|
}
|
|
|
|
/**
|
|
* gfs2_alloc_extent - allocate an extent from a given bitmap
|
|
* @rbm: the resource group information
|
|
* @dinode: TRUE if the first block we allocate is for a dinode
|
|
* @n: The extent length (value/result)
|
|
*
|
|
* Add the bitmap buffer to the transaction.
|
|
* Set the found bits to @new_state to change block's allocation state.
|
|
*/
|
|
static void gfs2_alloc_extent(const struct gfs2_rbm *rbm, bool dinode,
|
|
unsigned int *n)
|
|
{
|
|
struct gfs2_rbm pos = { .rgd = rbm->rgd, };
|
|
const unsigned int elen = *n;
|
|
u64 block;
|
|
int ret;
|
|
|
|
*n = 1;
|
|
block = gfs2_rbm_to_block(rbm);
|
|
gfs2_trans_add_meta(rbm->rgd->rd_gl, rbm_bi(rbm)->bi_bh);
|
|
gfs2_setbit(rbm, true, dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
|
|
block++;
|
|
while (*n < elen) {
|
|
ret = gfs2_rbm_from_block(&pos, block);
|
|
if (ret || gfs2_testbit(&pos, true) != GFS2_BLKST_FREE)
|
|
break;
|
|
gfs2_trans_add_meta(pos.rgd->rd_gl, rbm_bi(&pos)->bi_bh);
|
|
gfs2_setbit(&pos, true, GFS2_BLKST_USED);
|
|
(*n)++;
|
|
block++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* rgblk_free - Change alloc state of given block(s)
|
|
* @sdp: the filesystem
|
|
* @rgd: the resource group the blocks are in
|
|
* @bstart: the start of a run of blocks to free
|
|
* @blen: the length of the block run (all must lie within ONE RG!)
|
|
* @new_state: GFS2_BLKST_XXX the after-allocation block state
|
|
*/
|
|
|
|
static void rgblk_free(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd,
|
|
u64 bstart, u32 blen, unsigned char new_state)
|
|
{
|
|
struct gfs2_rbm rbm;
|
|
struct gfs2_bitmap *bi, *bi_prev = NULL;
|
|
|
|
rbm.rgd = rgd;
|
|
if (WARN_ON_ONCE(gfs2_rbm_from_block(&rbm, bstart)))
|
|
return;
|
|
while (blen--) {
|
|
bi = rbm_bi(&rbm);
|
|
if (bi != bi_prev) {
|
|
if (!bi->bi_clone) {
|
|
bi->bi_clone = kmalloc(bi->bi_bh->b_size,
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
memcpy(bi->bi_clone + bi->bi_offset,
|
|
bi->bi_bh->b_data + bi->bi_offset,
|
|
bi->bi_bytes);
|
|
}
|
|
gfs2_trans_add_meta(rbm.rgd->rd_gl, bi->bi_bh);
|
|
bi_prev = bi;
|
|
}
|
|
gfs2_setbit(&rbm, false, new_state);
|
|
gfs2_rbm_add(&rbm, 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_rgrp_dump - print out an rgrp
|
|
* @seq: The iterator
|
|
* @rgd: The rgrp in question
|
|
* @fs_id_buf: pointer to file system id (if requested)
|
|
*
|
|
*/
|
|
|
|
void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_rgrpd *rgd,
|
|
const char *fs_id_buf)
|
|
{
|
|
struct gfs2_blkreserv *trs;
|
|
const struct rb_node *n;
|
|
|
|
spin_lock(&rgd->rd_rsspin);
|
|
gfs2_print_dbg(seq, "%s R: n:%llu f:%02x b:%u/%u i:%u q:%u r:%u e:%u\n",
|
|
fs_id_buf,
|
|
(unsigned long long)rgd->rd_addr, rgd->rd_flags,
|
|
rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes,
|
|
rgd->rd_requested, rgd->rd_reserved, rgd->rd_extfail_pt);
|
|
if (rgd->rd_sbd->sd_args.ar_rgrplvb) {
|
|
struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
|
|
|
|
gfs2_print_dbg(seq, "%s L: f:%02x b:%u i:%u\n", fs_id_buf,
|
|
be32_to_cpu(rgl->rl_flags),
|
|
be32_to_cpu(rgl->rl_free),
|
|
be32_to_cpu(rgl->rl_dinodes));
|
|
}
|
|
for (n = rb_first(&rgd->rd_rstree); n; n = rb_next(&trs->rs_node)) {
|
|
trs = rb_entry(n, struct gfs2_blkreserv, rs_node);
|
|
dump_rs(seq, trs, fs_id_buf);
|
|
}
|
|
spin_unlock(&rgd->rd_rsspin);
|
|
}
|
|
|
|
static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
|
|
|
|
fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
|
|
(unsigned long long)rgd->rd_addr);
|
|
fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
|
|
sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
|
|
gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
|
|
rgd->rd_flags |= GFS2_RDF_ERROR;
|
|
}
|
|
|
|
/**
|
|
* gfs2_adjust_reservation - Adjust (or remove) a reservation after allocation
|
|
* @ip: The inode we have just allocated blocks for
|
|
* @rbm: The start of the allocated blocks
|
|
* @len: The extent length
|
|
*
|
|
* Adjusts a reservation after an allocation has taken place. If the
|
|
* reservation does not match the allocation, or if it is now empty
|
|
* then it is removed.
|
|
*/
|
|
|
|
static void gfs2_adjust_reservation(struct gfs2_inode *ip,
|
|
const struct gfs2_rbm *rbm, unsigned len)
|
|
{
|
|
struct gfs2_blkreserv *rs = &ip->i_res;
|
|
struct gfs2_rgrpd *rgd = rbm->rgd;
|
|
|
|
BUG_ON(rs->rs_reserved < len);
|
|
rs->rs_reserved -= len;
|
|
if (gfs2_rs_active(rs)) {
|
|
u64 start = gfs2_rbm_to_block(rbm);
|
|
|
|
if (rs->rs_start == start) {
|
|
unsigned int rlen;
|
|
|
|
rs->rs_start += len;
|
|
rlen = min(rs->rs_requested, len);
|
|
rs->rs_requested -= rlen;
|
|
rgd->rd_requested -= rlen;
|
|
trace_gfs2_rs(rs, TRACE_RS_CLAIM);
|
|
if (rs->rs_start < rgd->rd_data0 + rgd->rd_data &&
|
|
rs->rs_requested)
|
|
return;
|
|
/* We used up our block reservation, so we should
|
|
reserve more blocks next time. */
|
|
atomic_add(RGRP_RSRV_ADDBLKS, &ip->i_sizehint);
|
|
}
|
|
__rs_deltree(rs);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_set_alloc_start - Set starting point for block allocation
|
|
* @rbm: The rbm which will be set to the required location
|
|
* @ip: The gfs2 inode
|
|
* @dinode: Flag to say if allocation includes a new inode
|
|
*
|
|
* This sets the starting point from the reservation if one is active
|
|
* otherwise it falls back to guessing a start point based on the
|
|
* inode's goal block or the last allocation point in the rgrp.
|
|
*/
|
|
|
|
static void gfs2_set_alloc_start(struct gfs2_rbm *rbm,
|
|
const struct gfs2_inode *ip, bool dinode)
|
|
{
|
|
u64 goal;
|
|
|
|
if (gfs2_rs_active(&ip->i_res)) {
|
|
goal = ip->i_res.rs_start;
|
|
} else {
|
|
if (!dinode && rgrp_contains_block(rbm->rgd, ip->i_goal))
|
|
goal = ip->i_goal;
|
|
else
|
|
goal = rbm->rgd->rd_last_alloc + rbm->rgd->rd_data0;
|
|
}
|
|
if (WARN_ON_ONCE(gfs2_rbm_from_block(rbm, goal))) {
|
|
rbm->bii = 0;
|
|
rbm->offset = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_alloc_blocks - Allocate one or more blocks of data and/or a dinode
|
|
* @ip: the inode to allocate the block for
|
|
* @bn: Used to return the starting block number
|
|
* @nblocks: requested number of blocks/extent length (value/result)
|
|
* @dinode: 1 if we're allocating a dinode block, else 0
|
|
* @generation: the generation number of the inode
|
|
*
|
|
* Returns: 0 or error
|
|
*/
|
|
|
|
int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
|
|
bool dinode, u64 *generation)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct buffer_head *dibh;
|
|
struct gfs2_rbm rbm = { .rgd = ip->i_res.rs_rgd, };
|
|
u64 block; /* block, within the file system scope */
|
|
u32 minext = 1;
|
|
int error = -ENOSPC;
|
|
|
|
BUG_ON(ip->i_res.rs_reserved < *nblocks);
|
|
|
|
rgrp_lock_local(rbm.rgd);
|
|
if (gfs2_rs_active(&ip->i_res)) {
|
|
gfs2_set_alloc_start(&rbm, ip, dinode);
|
|
error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, &minext, &ip->i_res, false);
|
|
}
|
|
if (error == -ENOSPC) {
|
|
gfs2_set_alloc_start(&rbm, ip, dinode);
|
|
error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, &minext, NULL, false);
|
|
}
|
|
|
|
/* Since all blocks are reserved in advance, this shouldn't happen */
|
|
if (error) {
|
|
fs_warn(sdp, "inum=%llu error=%d, nblocks=%u, full=%d fail_pt=%d\n",
|
|
(unsigned long long)ip->i_no_addr, error, *nblocks,
|
|
test_bit(GBF_FULL, &rbm.rgd->rd_bits->bi_flags),
|
|
rbm.rgd->rd_extfail_pt);
|
|
goto rgrp_error;
|
|
}
|
|
|
|
gfs2_alloc_extent(&rbm, dinode, nblocks);
|
|
block = gfs2_rbm_to_block(&rbm);
|
|
rbm.rgd->rd_last_alloc = block - rbm.rgd->rd_data0;
|
|
if (!dinode) {
|
|
ip->i_goal = block + *nblocks - 1;
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error == 0) {
|
|
struct gfs2_dinode *di =
|
|
(struct gfs2_dinode *)dibh->b_data;
|
|
gfs2_trans_add_meta(ip->i_gl, dibh);
|
|
di->di_goal_meta = di->di_goal_data =
|
|
cpu_to_be64(ip->i_goal);
|
|
brelse(dibh);
|
|
}
|
|
}
|
|
spin_lock(&rbm.rgd->rd_rsspin);
|
|
gfs2_adjust_reservation(ip, &rbm, *nblocks);
|
|
if (rbm.rgd->rd_free < *nblocks || rbm.rgd->rd_reserved < *nblocks) {
|
|
fs_warn(sdp, "nblocks=%u\n", *nblocks);
|
|
spin_unlock(&rbm.rgd->rd_rsspin);
|
|
goto rgrp_error;
|
|
}
|
|
BUG_ON(rbm.rgd->rd_reserved < *nblocks);
|
|
BUG_ON(rbm.rgd->rd_free_clone < *nblocks);
|
|
BUG_ON(rbm.rgd->rd_free < *nblocks);
|
|
rbm.rgd->rd_reserved -= *nblocks;
|
|
rbm.rgd->rd_free_clone -= *nblocks;
|
|
rbm.rgd->rd_free -= *nblocks;
|
|
spin_unlock(&rbm.rgd->rd_rsspin);
|
|
if (dinode) {
|
|
rbm.rgd->rd_dinodes++;
|
|
*generation = rbm.rgd->rd_igeneration++;
|
|
if (*generation == 0)
|
|
*generation = rbm.rgd->rd_igeneration++;
|
|
}
|
|
|
|
gfs2_trans_add_meta(rbm.rgd->rd_gl, rbm.rgd->rd_bits[0].bi_bh);
|
|
gfs2_rgrp_out(rbm.rgd, rbm.rgd->rd_bits[0].bi_bh->b_data);
|
|
rgrp_unlock_local(rbm.rgd);
|
|
|
|
gfs2_statfs_change(sdp, 0, -(s64)*nblocks, dinode ? 1 : 0);
|
|
if (dinode)
|
|
gfs2_trans_remove_revoke(sdp, block, *nblocks);
|
|
|
|
gfs2_quota_change(ip, *nblocks, ip->i_inode.i_uid, ip->i_inode.i_gid);
|
|
|
|
trace_gfs2_block_alloc(ip, rbm.rgd, block, *nblocks,
|
|
dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
|
|
*bn = block;
|
|
return 0;
|
|
|
|
rgrp_error:
|
|
rgrp_unlock_local(rbm.rgd);
|
|
gfs2_rgrp_error(rbm.rgd);
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* __gfs2_free_blocks - free a contiguous run of block(s)
|
|
* @ip: the inode these blocks are being freed from
|
|
* @rgd: the resource group the blocks are in
|
|
* @bstart: first block of a run of contiguous blocks
|
|
* @blen: the length of the block run
|
|
* @meta: 1 if the blocks represent metadata
|
|
*
|
|
*/
|
|
|
|
void __gfs2_free_blocks(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
|
|
u64 bstart, u32 blen, int meta)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
rgrp_lock_local(rgd);
|
|
rgblk_free(sdp, rgd, bstart, blen, GFS2_BLKST_FREE);
|
|
trace_gfs2_block_alloc(ip, rgd, bstart, blen, GFS2_BLKST_FREE);
|
|
rgd->rd_free += blen;
|
|
rgd->rd_flags &= ~GFS2_RGF_TRIMMED;
|
|
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
|
|
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
|
|
rgrp_unlock_local(rgd);
|
|
|
|
/* Directories keep their data in the metadata address space */
|
|
if (meta || ip->i_depth || gfs2_is_jdata(ip))
|
|
gfs2_journal_wipe(ip, bstart, blen);
|
|
}
|
|
|
|
/**
|
|
* gfs2_free_meta - free a contiguous run of data block(s)
|
|
* @ip: the inode these blocks are being freed from
|
|
* @rgd: the resource group the blocks are in
|
|
* @bstart: first block of a run of contiguous blocks
|
|
* @blen: the length of the block run
|
|
*
|
|
*/
|
|
|
|
void gfs2_free_meta(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
|
|
u64 bstart, u32 blen)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
__gfs2_free_blocks(ip, rgd, bstart, blen, 1);
|
|
gfs2_statfs_change(sdp, 0, +blen, 0);
|
|
gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
|
|
}
|
|
|
|
void gfs2_unlink_di(struct inode *inode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_rgrpd *rgd;
|
|
u64 blkno = ip->i_no_addr;
|
|
|
|
rgd = gfs2_blk2rgrpd(sdp, blkno, true);
|
|
if (!rgd)
|
|
return;
|
|
rgrp_lock_local(rgd);
|
|
rgblk_free(sdp, rgd, blkno, 1, GFS2_BLKST_UNLINKED);
|
|
trace_gfs2_block_alloc(ip, rgd, blkno, 1, GFS2_BLKST_UNLINKED);
|
|
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
|
|
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
|
|
be32_add_cpu(&rgd->rd_rgl->rl_unlinked, 1);
|
|
rgrp_unlock_local(rgd);
|
|
}
|
|
|
|
void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
|
|
rgrp_lock_local(rgd);
|
|
rgblk_free(sdp, rgd, ip->i_no_addr, 1, GFS2_BLKST_FREE);
|
|
if (!rgd->rd_dinodes)
|
|
gfs2_consist_rgrpd(rgd);
|
|
rgd->rd_dinodes--;
|
|
rgd->rd_free++;
|
|
|
|
gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
|
|
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
|
|
rgrp_unlock_local(rgd);
|
|
be32_add_cpu(&rgd->rd_rgl->rl_unlinked, -1);
|
|
|
|
gfs2_statfs_change(sdp, 0, +1, -1);
|
|
trace_gfs2_block_alloc(ip, rgd, ip->i_no_addr, 1, GFS2_BLKST_FREE);
|
|
gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
|
|
gfs2_journal_wipe(ip, ip->i_no_addr, 1);
|
|
}
|
|
|
|
/**
|
|
* gfs2_check_blk_type - Check the type of a block
|
|
* @sdp: The superblock
|
|
* @no_addr: The block number to check
|
|
* @type: The block type we are looking for
|
|
*
|
|
* The inode glock of @no_addr must be held. The @type to check for is either
|
|
* GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; checking for type GFS2_BLKST_FREE
|
|
* or GFS2_BLKST_USED would make no sense.
|
|
*
|
|
* Returns: 0 if the block type matches the expected type
|
|
* -ESTALE if it doesn't match
|
|
* or -ve errno if something went wrong while checking
|
|
*/
|
|
|
|
int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
|
|
{
|
|
struct gfs2_rgrpd *rgd;
|
|
struct gfs2_holder rgd_gh;
|
|
struct gfs2_rbm rbm;
|
|
int error = -EINVAL;
|
|
|
|
rgd = gfs2_blk2rgrpd(sdp, no_addr, 1);
|
|
if (!rgd)
|
|
goto fail;
|
|
|
|
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
|
|
if (error)
|
|
goto fail;
|
|
|
|
rbm.rgd = rgd;
|
|
error = gfs2_rbm_from_block(&rbm, no_addr);
|
|
if (!WARN_ON_ONCE(error)) {
|
|
/*
|
|
* No need to take the local resource group lock here; the
|
|
* inode glock of @no_addr provides the necessary
|
|
* synchronization in case the block is an inode. (In case
|
|
* the block is not an inode, the block type will not match
|
|
* the @type we are looking for.)
|
|
*/
|
|
if (gfs2_testbit(&rbm, false) != type)
|
|
error = -ESTALE;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&rgd_gh);
|
|
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rlist_add - add a RG to a list of RGs
|
|
* @ip: the inode
|
|
* @rlist: the list of resource groups
|
|
* @block: the block
|
|
*
|
|
* Figure out what RG a block belongs to and add that RG to the list
|
|
*
|
|
* FIXME: Don't use NOFAIL
|
|
*
|
|
*/
|
|
|
|
void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
|
|
u64 block)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct gfs2_rgrpd *rgd;
|
|
struct gfs2_rgrpd **tmp;
|
|
unsigned int new_space;
|
|
unsigned int x;
|
|
|
|
if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
|
|
return;
|
|
|
|
/*
|
|
* The resource group last accessed is kept in the last position.
|
|
*/
|
|
|
|
if (rlist->rl_rgrps) {
|
|
rgd = rlist->rl_rgd[rlist->rl_rgrps - 1];
|
|
if (rgrp_contains_block(rgd, block))
|
|
return;
|
|
rgd = gfs2_blk2rgrpd(sdp, block, 1);
|
|
} else {
|
|
rgd = ip->i_res.rs_rgd;
|
|
if (!rgd || !rgrp_contains_block(rgd, block))
|
|
rgd = gfs2_blk2rgrpd(sdp, block, 1);
|
|
}
|
|
|
|
if (!rgd) {
|
|
fs_err(sdp, "rlist_add: no rgrp for block %llu\n",
|
|
(unsigned long long)block);
|
|
return;
|
|
}
|
|
|
|
for (x = 0; x < rlist->rl_rgrps; x++) {
|
|
if (rlist->rl_rgd[x] == rgd) {
|
|
swap(rlist->rl_rgd[x],
|
|
rlist->rl_rgd[rlist->rl_rgrps - 1]);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (rlist->rl_rgrps == rlist->rl_space) {
|
|
new_space = rlist->rl_space + 10;
|
|
|
|
tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
|
|
if (rlist->rl_rgd) {
|
|
memcpy(tmp, rlist->rl_rgd,
|
|
rlist->rl_space * sizeof(struct gfs2_rgrpd *));
|
|
kfree(rlist->rl_rgd);
|
|
}
|
|
|
|
rlist->rl_space = new_space;
|
|
rlist->rl_rgd = tmp;
|
|
}
|
|
|
|
rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
|
|
* and initialize an array of glock holders for them
|
|
* @rlist: the list of resource groups
|
|
*
|
|
* FIXME: Don't use NOFAIL
|
|
*
|
|
*/
|
|
|
|
void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist)
|
|
{
|
|
unsigned int x;
|
|
|
|
rlist->rl_ghs = kmalloc_array(rlist->rl_rgrps,
|
|
sizeof(struct gfs2_holder),
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
for (x = 0; x < rlist->rl_rgrps; x++)
|
|
gfs2_holder_init(rlist->rl_rgd[x]->rd_gl, LM_ST_EXCLUSIVE,
|
|
LM_FLAG_NODE_SCOPE, &rlist->rl_ghs[x]);
|
|
}
|
|
|
|
/**
|
|
* gfs2_rlist_free - free a resource group list
|
|
* @rlist: the list of resource groups
|
|
*
|
|
*/
|
|
|
|
void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
|
|
{
|
|
unsigned int x;
|
|
|
|
kfree(rlist->rl_rgd);
|
|
|
|
if (rlist->rl_ghs) {
|
|
for (x = 0; x < rlist->rl_rgrps; x++)
|
|
gfs2_holder_uninit(&rlist->rl_ghs[x]);
|
|
kfree(rlist->rl_ghs);
|
|
rlist->rl_ghs = NULL;
|
|
}
|
|
}
|
|
|
|
void rgrp_lock_local(struct gfs2_rgrpd *rgd)
|
|
{
|
|
BUG_ON(!gfs2_glock_is_held_excl(rgd->rd_gl) &&
|
|
!test_bit(SDF_NORECOVERY, &rgd->rd_sbd->sd_flags));
|
|
mutex_lock(&rgd->rd_mutex);
|
|
}
|
|
|
|
void rgrp_unlock_local(struct gfs2_rgrpd *rgd)
|
|
{
|
|
mutex_unlock(&rgd->rd_mutex);
|
|
}
|