![Christoph Hellwig](/assets/img/avatar_default.png)
Unify the ways we add buffers to the delwri queue by always calling xfs_buf_delwri_queue directly. The xfs_bdwrite functions is removed and opencoded in its callers, and the two places setting XBF_DELWRI while a buffer is locked and expecting xfs_buf_unlock to pick it up are converted to call xfs_buf_delwri_queue directly, too. Also replace the XFS_BUF_UNDELAYWRITE macro with direct calls to xfs_buf_delwri_dequeue to make the explicit queuing/dequeuing more obvious. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Alex Elder <aelder@sgi.com>
1052 lines
29 KiB
C
1052 lines
29 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_buf_item.h"
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#include "xfs_trans_priv.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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kmem_zone_t *xfs_buf_item_zone;
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static inline struct xfs_buf_log_item *BUF_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_buf_log_item, bli_item);
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}
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#ifdef XFS_TRANS_DEBUG
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/*
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* This function uses an alternate strategy for tracking the bytes
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* that the user requests to be logged. This can then be used
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* in conjunction with the bli_orig array in the buf log item to
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* catch bugs in our callers' code.
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*
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* We also double check the bits set in xfs_buf_item_log using a
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* simple algorithm to check that every byte is accounted for.
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*/
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STATIC void
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xfs_buf_item_log_debug(
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xfs_buf_log_item_t *bip,
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uint first,
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uint last)
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{
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uint x;
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uint byte;
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uint nbytes;
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uint chunk_num;
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uint word_num;
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uint bit_num;
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uint bit_set;
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uint *wordp;
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ASSERT(bip->bli_logged != NULL);
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byte = first;
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nbytes = last - first + 1;
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bfset(bip->bli_logged, first, nbytes);
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for (x = 0; x < nbytes; x++) {
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chunk_num = byte >> XFS_BLF_SHIFT;
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word_num = chunk_num >> BIT_TO_WORD_SHIFT;
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bit_num = chunk_num & (NBWORD - 1);
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wordp = &(bip->bli_format.blf_data_map[word_num]);
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bit_set = *wordp & (1 << bit_num);
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ASSERT(bit_set);
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byte++;
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}
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}
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/*
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* This function is called when we flush something into a buffer without
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* logging it. This happens for things like inodes which are logged
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* separately from the buffer.
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*/
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void
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xfs_buf_item_flush_log_debug(
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xfs_buf_t *bp,
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uint first,
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uint last)
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{
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xfs_buf_log_item_t *bip = bp->b_fspriv;
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uint nbytes;
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if (bip == NULL || (bip->bli_item.li_type != XFS_LI_BUF))
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return;
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ASSERT(bip->bli_logged != NULL);
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nbytes = last - first + 1;
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bfset(bip->bli_logged, first, nbytes);
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}
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/*
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* This function is called to verify that our callers have logged
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* all the bytes that they changed.
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*
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* It does this by comparing the original copy of the buffer stored in
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* the buf log item's bli_orig array to the current copy of the buffer
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* and ensuring that all bytes which mismatch are set in the bli_logged
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* array of the buf log item.
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*/
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STATIC void
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xfs_buf_item_log_check(
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xfs_buf_log_item_t *bip)
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{
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char *orig;
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char *buffer;
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int x;
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xfs_buf_t *bp;
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ASSERT(bip->bli_orig != NULL);
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ASSERT(bip->bli_logged != NULL);
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bp = bip->bli_buf;
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ASSERT(XFS_BUF_COUNT(bp) > 0);
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ASSERT(bp->b_addr != NULL);
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orig = bip->bli_orig;
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buffer = bp->b_addr;
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for (x = 0; x < XFS_BUF_COUNT(bp); x++) {
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if (orig[x] != buffer[x] && !btst(bip->bli_logged, x)) {
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xfs_emerg(bp->b_mount,
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"%s: bip %x buffer %x orig %x index %d",
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__func__, bip, bp, orig, x);
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ASSERT(0);
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}
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}
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}
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#else
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#define xfs_buf_item_log_debug(x,y,z)
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#define xfs_buf_item_log_check(x)
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#endif
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STATIC void xfs_buf_do_callbacks(struct xfs_buf *bp);
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/*
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* This returns the number of log iovecs needed to log the
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* given buf log item.
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*
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* It calculates this as 1 iovec for the buf log format structure
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* and 1 for each stretch of non-contiguous chunks to be logged.
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* Contiguous chunks are logged in a single iovec.
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*
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* If the XFS_BLI_STALE flag has been set, then log nothing.
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*/
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STATIC uint
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xfs_buf_item_size(
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struct xfs_log_item *lip)
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{
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struct xfs_buf_log_item *bip = BUF_ITEM(lip);
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struct xfs_buf *bp = bip->bli_buf;
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uint nvecs;
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int next_bit;
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int last_bit;
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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if (bip->bli_flags & XFS_BLI_STALE) {
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/*
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* The buffer is stale, so all we need to log
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* is the buf log format structure with the
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* cancel flag in it.
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*/
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trace_xfs_buf_item_size_stale(bip);
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ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
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return 1;
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}
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ASSERT(bip->bli_flags & XFS_BLI_LOGGED);
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nvecs = 1;
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last_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size, 0);
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ASSERT(last_bit != -1);
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nvecs++;
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while (last_bit != -1) {
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/*
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* This takes the bit number to start looking from and
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* returns the next set bit from there. It returns -1
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* if there are no more bits set or the start bit is
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* beyond the end of the bitmap.
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*/
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next_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size,
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last_bit + 1);
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/*
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* If we run out of bits, leave the loop,
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* else if we find a new set of bits bump the number of vecs,
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* else keep scanning the current set of bits.
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*/
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if (next_bit == -1) {
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last_bit = -1;
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} else if (next_bit != last_bit + 1) {
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last_bit = next_bit;
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nvecs++;
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} else if (xfs_buf_offset(bp, next_bit * XFS_BLF_CHUNK) !=
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(xfs_buf_offset(bp, last_bit * XFS_BLF_CHUNK) +
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XFS_BLF_CHUNK)) {
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last_bit = next_bit;
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nvecs++;
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} else {
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last_bit++;
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}
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}
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trace_xfs_buf_item_size(bip);
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return nvecs;
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}
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/*
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* This is called to fill in the vector of log iovecs for the
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* given log buf item. It fills the first entry with a buf log
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* format structure, and the rest point to contiguous chunks
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* within the buffer.
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*/
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STATIC void
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xfs_buf_item_format(
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struct xfs_log_item *lip,
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struct xfs_log_iovec *vecp)
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{
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struct xfs_buf_log_item *bip = BUF_ITEM(lip);
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struct xfs_buf *bp = bip->bli_buf;
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uint base_size;
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uint nvecs;
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int first_bit;
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int last_bit;
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int next_bit;
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uint nbits;
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uint buffer_offset;
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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ASSERT((bip->bli_flags & XFS_BLI_LOGGED) ||
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(bip->bli_flags & XFS_BLI_STALE));
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/*
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* The size of the base structure is the size of the
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* declared structure plus the space for the extra words
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* of the bitmap. We subtract one from the map size, because
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* the first element of the bitmap is accounted for in the
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* size of the base structure.
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*/
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base_size =
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(uint)(sizeof(xfs_buf_log_format_t) +
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((bip->bli_format.blf_map_size - 1) * sizeof(uint)));
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vecp->i_addr = &bip->bli_format;
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vecp->i_len = base_size;
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vecp->i_type = XLOG_REG_TYPE_BFORMAT;
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vecp++;
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nvecs = 1;
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/*
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* If it is an inode buffer, transfer the in-memory state to the
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* format flags and clear the in-memory state. We do not transfer
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* this state if the inode buffer allocation has not yet been committed
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* to the log as setting the XFS_BLI_INODE_BUF flag will prevent
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* correct replay of the inode allocation.
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*/
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if (bip->bli_flags & XFS_BLI_INODE_BUF) {
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if (!((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) &&
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xfs_log_item_in_current_chkpt(lip)))
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bip->bli_format.blf_flags |= XFS_BLF_INODE_BUF;
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bip->bli_flags &= ~XFS_BLI_INODE_BUF;
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}
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if (bip->bli_flags & XFS_BLI_STALE) {
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/*
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* The buffer is stale, so all we need to log
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* is the buf log format structure with the
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* cancel flag in it.
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*/
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trace_xfs_buf_item_format_stale(bip);
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ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
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bip->bli_format.blf_size = nvecs;
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return;
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}
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/*
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* Fill in an iovec for each set of contiguous chunks.
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*/
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first_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size, 0);
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ASSERT(first_bit != -1);
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last_bit = first_bit;
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nbits = 1;
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for (;;) {
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/*
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* This takes the bit number to start looking from and
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* returns the next set bit from there. It returns -1
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* if there are no more bits set or the start bit is
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* beyond the end of the bitmap.
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*/
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next_bit = xfs_next_bit(bip->bli_format.blf_data_map,
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bip->bli_format.blf_map_size,
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(uint)last_bit + 1);
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/*
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* If we run out of bits fill in the last iovec and get
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* out of the loop.
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* Else if we start a new set of bits then fill in the
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* iovec for the series we were looking at and start
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* counting the bits in the new one.
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* Else we're still in the same set of bits so just
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* keep counting and scanning.
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*/
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if (next_bit == -1) {
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buffer_offset = first_bit * XFS_BLF_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLF_CHUNK;
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vecp->i_type = XLOG_REG_TYPE_BCHUNK;
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nvecs++;
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break;
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} else if (next_bit != last_bit + 1) {
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buffer_offset = first_bit * XFS_BLF_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLF_CHUNK;
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vecp->i_type = XLOG_REG_TYPE_BCHUNK;
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nvecs++;
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vecp++;
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first_bit = next_bit;
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last_bit = next_bit;
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nbits = 1;
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} else if (xfs_buf_offset(bp, next_bit << XFS_BLF_SHIFT) !=
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(xfs_buf_offset(bp, last_bit << XFS_BLF_SHIFT) +
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XFS_BLF_CHUNK)) {
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buffer_offset = first_bit * XFS_BLF_CHUNK;
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vecp->i_addr = xfs_buf_offset(bp, buffer_offset);
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vecp->i_len = nbits * XFS_BLF_CHUNK;
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vecp->i_type = XLOG_REG_TYPE_BCHUNK;
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/* You would think we need to bump the nvecs here too, but we do not
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* this number is used by recovery, and it gets confused by the boundary
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* split here
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* nvecs++;
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*/
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vecp++;
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first_bit = next_bit;
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last_bit = next_bit;
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nbits = 1;
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} else {
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last_bit++;
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nbits++;
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}
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}
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bip->bli_format.blf_size = nvecs;
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/*
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* Check to make sure everything is consistent.
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*/
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trace_xfs_buf_item_format(bip);
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xfs_buf_item_log_check(bip);
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}
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/*
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* This is called to pin the buffer associated with the buf log item in memory
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* so it cannot be written out.
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*
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* We also always take a reference to the buffer log item here so that the bli
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* is held while the item is pinned in memory. This means that we can
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* unconditionally drop the reference count a transaction holds when the
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* transaction is completed.
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*/
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STATIC void
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xfs_buf_item_pin(
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struct xfs_log_item *lip)
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{
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struct xfs_buf_log_item *bip = BUF_ITEM(lip);
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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ASSERT((bip->bli_flags & XFS_BLI_LOGGED) ||
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(bip->bli_flags & XFS_BLI_STALE));
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trace_xfs_buf_item_pin(bip);
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atomic_inc(&bip->bli_refcount);
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atomic_inc(&bip->bli_buf->b_pin_count);
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}
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/*
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* This is called to unpin the buffer associated with the buf log
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* item which was previously pinned with a call to xfs_buf_item_pin().
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*
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* Also drop the reference to the buf item for the current transaction.
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* If the XFS_BLI_STALE flag is set and we are the last reference,
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* then free up the buf log item and unlock the buffer.
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*
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* If the remove flag is set we are called from uncommit in the
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* forced-shutdown path. If that is true and the reference count on
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* the log item is going to drop to zero we need to free the item's
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* descriptor in the transaction.
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*/
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STATIC void
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xfs_buf_item_unpin(
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struct xfs_log_item *lip,
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int remove)
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{
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struct xfs_buf_log_item *bip = BUF_ITEM(lip);
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xfs_buf_t *bp = bip->bli_buf;
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struct xfs_ail *ailp = lip->li_ailp;
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int stale = bip->bli_flags & XFS_BLI_STALE;
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int freed;
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ASSERT(bp->b_fspriv == bip);
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ASSERT(atomic_read(&bip->bli_refcount) > 0);
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trace_xfs_buf_item_unpin(bip);
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freed = atomic_dec_and_test(&bip->bli_refcount);
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if (atomic_dec_and_test(&bp->b_pin_count))
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wake_up_all(&bp->b_waiters);
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if (freed && stale) {
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ASSERT(bip->bli_flags & XFS_BLI_STALE);
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ASSERT(xfs_buf_islocked(bp));
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ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
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ASSERT(XFS_BUF_ISSTALE(bp));
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ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
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trace_xfs_buf_item_unpin_stale(bip);
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if (remove) {
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/*
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* If we are in a transaction context, we have to
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* remove the log item from the transaction as we are
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* about to release our reference to the buffer. If we
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* don't, the unlock that occurs later in
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* xfs_trans_uncommit() will try to reference the
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* buffer which we no longer have a hold on.
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*/
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if (lip->li_desc)
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xfs_trans_del_item(lip);
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/*
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* Since the transaction no longer refers to the buffer,
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* the buffer should no longer refer to the transaction.
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*/
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bp->b_transp = NULL;
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}
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/*
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* If we get called here because of an IO error, we may
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* or may not have the item on the AIL. xfs_trans_ail_delete()
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* will take care of that situation.
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* xfs_trans_ail_delete() drops the AIL lock.
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*/
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if (bip->bli_flags & XFS_BLI_STALE_INODE) {
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xfs_buf_do_callbacks(bp);
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bp->b_fspriv = NULL;
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bp->b_iodone = NULL;
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} else {
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spin_lock(&ailp->xa_lock);
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xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip);
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xfs_buf_item_relse(bp);
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ASSERT(bp->b_fspriv == NULL);
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}
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xfs_buf_relse(bp);
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}
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}
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/*
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* This is called to attempt to lock the buffer associated with this
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* buf log item. Don't sleep on the buffer lock. If we can't get
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|
* the lock right away, return 0. If we can get the lock, take a
|
|
* reference to the buffer. If this is a delayed write buffer that
|
|
* needs AIL help to be written back, invoke the pushbuf routine
|
|
* rather than the normal success path.
|
|
*/
|
|
STATIC uint
|
|
xfs_buf_item_trylock(
|
|
struct xfs_log_item *lip)
|
|
{
|
|
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
|
|
struct xfs_buf *bp = bip->bli_buf;
|
|
|
|
if (xfs_buf_ispinned(bp))
|
|
return XFS_ITEM_PINNED;
|
|
if (!xfs_buf_trylock(bp))
|
|
return XFS_ITEM_LOCKED;
|
|
|
|
/* take a reference to the buffer. */
|
|
xfs_buf_hold(bp);
|
|
|
|
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
|
|
trace_xfs_buf_item_trylock(bip);
|
|
if (XFS_BUF_ISDELAYWRITE(bp))
|
|
return XFS_ITEM_PUSHBUF;
|
|
return XFS_ITEM_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Release the buffer associated with the buf log item. If there is no dirty
|
|
* logged data associated with the buffer recorded in the buf log item, then
|
|
* free the buf log item and remove the reference to it in the buffer.
|
|
*
|
|
* This call ignores the recursion count. It is only called when the buffer
|
|
* should REALLY be unlocked, regardless of the recursion count.
|
|
*
|
|
* We unconditionally drop the transaction's reference to the log item. If the
|
|
* item was logged, then another reference was taken when it was pinned, so we
|
|
* can safely drop the transaction reference now. This also allows us to avoid
|
|
* potential races with the unpin code freeing the bli by not referencing the
|
|
* bli after we've dropped the reference count.
|
|
*
|
|
* If the XFS_BLI_HOLD flag is set in the buf log item, then free the log item
|
|
* if necessary but do not unlock the buffer. This is for support of
|
|
* xfs_trans_bhold(). Make sure the XFS_BLI_HOLD field is cleared if we don't
|
|
* free the item.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_item_unlock(
|
|
struct xfs_log_item *lip)
|
|
{
|
|
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
|
|
struct xfs_buf *bp = bip->bli_buf;
|
|
int aborted;
|
|
uint hold;
|
|
|
|
/* Clear the buffer's association with this transaction. */
|
|
bp->b_transp = NULL;
|
|
|
|
/*
|
|
* If this is a transaction abort, don't return early. Instead, allow
|
|
* the brelse to happen. Normally it would be done for stale
|
|
* (cancelled) buffers at unpin time, but we'll never go through the
|
|
* pin/unpin cycle if we abort inside commit.
|
|
*/
|
|
aborted = (lip->li_flags & XFS_LI_ABORTED) != 0;
|
|
|
|
/*
|
|
* Before possibly freeing the buf item, determine if we should
|
|
* release the buffer at the end of this routine.
|
|
*/
|
|
hold = bip->bli_flags & XFS_BLI_HOLD;
|
|
|
|
/* Clear the per transaction state. */
|
|
bip->bli_flags &= ~(XFS_BLI_LOGGED | XFS_BLI_HOLD);
|
|
|
|
/*
|
|
* If the buf item is marked stale, then don't do anything. We'll
|
|
* unlock the buffer and free the buf item when the buffer is unpinned
|
|
* for the last time.
|
|
*/
|
|
if (bip->bli_flags & XFS_BLI_STALE) {
|
|
trace_xfs_buf_item_unlock_stale(bip);
|
|
ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
|
|
if (!aborted) {
|
|
atomic_dec(&bip->bli_refcount);
|
|
return;
|
|
}
|
|
}
|
|
|
|
trace_xfs_buf_item_unlock(bip);
|
|
|
|
/*
|
|
* If the buf item isn't tracking any data, free it, otherwise drop the
|
|
* reference we hold to it.
|
|
*/
|
|
if (xfs_bitmap_empty(bip->bli_format.blf_data_map,
|
|
bip->bli_format.blf_map_size))
|
|
xfs_buf_item_relse(bp);
|
|
else
|
|
atomic_dec(&bip->bli_refcount);
|
|
|
|
if (!hold)
|
|
xfs_buf_relse(bp);
|
|
}
|
|
|
|
/*
|
|
* This is called to find out where the oldest active copy of the
|
|
* buf log item in the on disk log resides now that the last log
|
|
* write of it completed at the given lsn.
|
|
* We always re-log all the dirty data in a buffer, so usually the
|
|
* latest copy in the on disk log is the only one that matters. For
|
|
* those cases we simply return the given lsn.
|
|
*
|
|
* The one exception to this is for buffers full of newly allocated
|
|
* inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF
|
|
* flag set, indicating that only the di_next_unlinked fields from the
|
|
* inodes in the buffers will be replayed during recovery. If the
|
|
* original newly allocated inode images have not yet been flushed
|
|
* when the buffer is so relogged, then we need to make sure that we
|
|
* keep the old images in the 'active' portion of the log. We do this
|
|
* by returning the original lsn of that transaction here rather than
|
|
* the current one.
|
|
*/
|
|
STATIC xfs_lsn_t
|
|
xfs_buf_item_committed(
|
|
struct xfs_log_item *lip,
|
|
xfs_lsn_t lsn)
|
|
{
|
|
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
|
|
|
|
trace_xfs_buf_item_committed(bip);
|
|
|
|
if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && lip->li_lsn != 0)
|
|
return lip->li_lsn;
|
|
return lsn;
|
|
}
|
|
|
|
/*
|
|
* The buffer is locked, but is not a delayed write buffer. This happens
|
|
* if we race with IO completion and hence we don't want to try to write it
|
|
* again. Just release the buffer.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_item_push(
|
|
struct xfs_log_item *lip)
|
|
{
|
|
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
|
|
struct xfs_buf *bp = bip->bli_buf;
|
|
|
|
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
|
|
ASSERT(!XFS_BUF_ISDELAYWRITE(bp));
|
|
|
|
trace_xfs_buf_item_push(bip);
|
|
|
|
xfs_buf_relse(bp);
|
|
}
|
|
|
|
/*
|
|
* The buffer is locked and is a delayed write buffer. Promote the buffer
|
|
* in the delayed write queue as the caller knows that they must invoke
|
|
* the xfsbufd to get this buffer written. We have to unlock the buffer
|
|
* to allow the xfsbufd to write it, too.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_item_pushbuf(
|
|
struct xfs_log_item *lip)
|
|
{
|
|
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
|
|
struct xfs_buf *bp = bip->bli_buf;
|
|
|
|
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
|
|
ASSERT(XFS_BUF_ISDELAYWRITE(bp));
|
|
|
|
trace_xfs_buf_item_pushbuf(bip);
|
|
|
|
xfs_buf_delwri_promote(bp);
|
|
xfs_buf_relse(bp);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_buf_item_committing(
|
|
struct xfs_log_item *lip,
|
|
xfs_lsn_t commit_lsn)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* This is the ops vector shared by all buf log items.
|
|
*/
|
|
static struct xfs_item_ops xfs_buf_item_ops = {
|
|
.iop_size = xfs_buf_item_size,
|
|
.iop_format = xfs_buf_item_format,
|
|
.iop_pin = xfs_buf_item_pin,
|
|
.iop_unpin = xfs_buf_item_unpin,
|
|
.iop_trylock = xfs_buf_item_trylock,
|
|
.iop_unlock = xfs_buf_item_unlock,
|
|
.iop_committed = xfs_buf_item_committed,
|
|
.iop_push = xfs_buf_item_push,
|
|
.iop_pushbuf = xfs_buf_item_pushbuf,
|
|
.iop_committing = xfs_buf_item_committing
|
|
};
|
|
|
|
|
|
/*
|
|
* Allocate a new buf log item to go with the given buffer.
|
|
* Set the buffer's b_fsprivate field to point to the new
|
|
* buf log item. If there are other item's attached to the
|
|
* buffer (see xfs_buf_attach_iodone() below), then put the
|
|
* buf log item at the front.
|
|
*/
|
|
void
|
|
xfs_buf_item_init(
|
|
xfs_buf_t *bp,
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_log_item_t *lip = bp->b_fspriv;
|
|
xfs_buf_log_item_t *bip;
|
|
int chunks;
|
|
int map_size;
|
|
|
|
/*
|
|
* Check to see if there is already a buf log item for
|
|
* this buffer. If there is, it is guaranteed to be
|
|
* the first. If we do already have one, there is
|
|
* nothing to do here so return.
|
|
*/
|
|
ASSERT(bp->b_target->bt_mount == mp);
|
|
if (lip != NULL && lip->li_type == XFS_LI_BUF)
|
|
return;
|
|
|
|
/*
|
|
* chunks is the number of XFS_BLF_CHUNK size pieces
|
|
* the buffer can be divided into. Make sure not to
|
|
* truncate any pieces. map_size is the size of the
|
|
* bitmap needed to describe the chunks of the buffer.
|
|
*/
|
|
chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLF_CHUNK - 1)) >> XFS_BLF_SHIFT);
|
|
map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT);
|
|
|
|
bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone,
|
|
KM_SLEEP);
|
|
xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops);
|
|
bip->bli_buf = bp;
|
|
xfs_buf_hold(bp);
|
|
bip->bli_format.blf_type = XFS_LI_BUF;
|
|
bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp);
|
|
bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp));
|
|
bip->bli_format.blf_map_size = map_size;
|
|
|
|
#ifdef XFS_TRANS_DEBUG
|
|
/*
|
|
* Allocate the arrays for tracking what needs to be logged
|
|
* and what our callers request to be logged. bli_orig
|
|
* holds a copy of the original, clean buffer for comparison
|
|
* against, and bli_logged keeps a 1 bit flag per byte in
|
|
* the buffer to indicate which bytes the callers have asked
|
|
* to have logged.
|
|
*/
|
|
bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP);
|
|
memcpy(bip->bli_orig, bp->b_addr, XFS_BUF_COUNT(bp));
|
|
bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP);
|
|
#endif
|
|
|
|
/*
|
|
* Put the buf item into the list of items attached to the
|
|
* buffer at the front.
|
|
*/
|
|
if (bp->b_fspriv)
|
|
bip->bli_item.li_bio_list = bp->b_fspriv;
|
|
bp->b_fspriv = bip;
|
|
}
|
|
|
|
|
|
/*
|
|
* Mark bytes first through last inclusive as dirty in the buf
|
|
* item's bitmap.
|
|
*/
|
|
void
|
|
xfs_buf_item_log(
|
|
xfs_buf_log_item_t *bip,
|
|
uint first,
|
|
uint last)
|
|
{
|
|
uint first_bit;
|
|
uint last_bit;
|
|
uint bits_to_set;
|
|
uint bits_set;
|
|
uint word_num;
|
|
uint *wordp;
|
|
uint bit;
|
|
uint end_bit;
|
|
uint mask;
|
|
|
|
/*
|
|
* Mark the item as having some dirty data for
|
|
* quick reference in xfs_buf_item_dirty.
|
|
*/
|
|
bip->bli_flags |= XFS_BLI_DIRTY;
|
|
|
|
/*
|
|
* Convert byte offsets to bit numbers.
|
|
*/
|
|
first_bit = first >> XFS_BLF_SHIFT;
|
|
last_bit = last >> XFS_BLF_SHIFT;
|
|
|
|
/*
|
|
* Calculate the total number of bits to be set.
|
|
*/
|
|
bits_to_set = last_bit - first_bit + 1;
|
|
|
|
/*
|
|
* Get a pointer to the first word in the bitmap
|
|
* to set a bit in.
|
|
*/
|
|
word_num = first_bit >> BIT_TO_WORD_SHIFT;
|
|
wordp = &(bip->bli_format.blf_data_map[word_num]);
|
|
|
|
/*
|
|
* Calculate the starting bit in the first word.
|
|
*/
|
|
bit = first_bit & (uint)(NBWORD - 1);
|
|
|
|
/*
|
|
* First set any bits in the first word of our range.
|
|
* If it starts at bit 0 of the word, it will be
|
|
* set below rather than here. That is what the variable
|
|
* bit tells us. The variable bits_set tracks the number
|
|
* of bits that have been set so far. End_bit is the number
|
|
* of the last bit to be set in this word plus one.
|
|
*/
|
|
if (bit) {
|
|
end_bit = MIN(bit + bits_to_set, (uint)NBWORD);
|
|
mask = ((1 << (end_bit - bit)) - 1) << bit;
|
|
*wordp |= mask;
|
|
wordp++;
|
|
bits_set = end_bit - bit;
|
|
} else {
|
|
bits_set = 0;
|
|
}
|
|
|
|
/*
|
|
* Now set bits a whole word at a time that are between
|
|
* first_bit and last_bit.
|
|
*/
|
|
while ((bits_to_set - bits_set) >= NBWORD) {
|
|
*wordp |= 0xffffffff;
|
|
bits_set += NBWORD;
|
|
wordp++;
|
|
}
|
|
|
|
/*
|
|
* Finally, set any bits left to be set in one last partial word.
|
|
*/
|
|
end_bit = bits_to_set - bits_set;
|
|
if (end_bit) {
|
|
mask = (1 << end_bit) - 1;
|
|
*wordp |= mask;
|
|
}
|
|
|
|
xfs_buf_item_log_debug(bip, first, last);
|
|
}
|
|
|
|
|
|
/*
|
|
* Return 1 if the buffer has some data that has been logged (at any
|
|
* point, not just the current transaction) and 0 if not.
|
|
*/
|
|
uint
|
|
xfs_buf_item_dirty(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
return (bip->bli_flags & XFS_BLI_DIRTY);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_buf_item_free(
|
|
xfs_buf_log_item_t *bip)
|
|
{
|
|
#ifdef XFS_TRANS_DEBUG
|
|
kmem_free(bip->bli_orig);
|
|
kmem_free(bip->bli_logged);
|
|
#endif /* XFS_TRANS_DEBUG */
|
|
|
|
kmem_zone_free(xfs_buf_item_zone, bip);
|
|
}
|
|
|
|
/*
|
|
* This is called when the buf log item is no longer needed. It should
|
|
* free the buf log item associated with the given buffer and clear
|
|
* the buffer's pointer to the buf log item. If there are no more
|
|
* items in the list, clear the b_iodone field of the buffer (see
|
|
* xfs_buf_attach_iodone() below).
|
|
*/
|
|
void
|
|
xfs_buf_item_relse(
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_buf_log_item_t *bip;
|
|
|
|
trace_xfs_buf_item_relse(bp, _RET_IP_);
|
|
|
|
bip = bp->b_fspriv;
|
|
bp->b_fspriv = bip->bli_item.li_bio_list;
|
|
if (bp->b_fspriv == NULL)
|
|
bp->b_iodone = NULL;
|
|
|
|
xfs_buf_rele(bp);
|
|
xfs_buf_item_free(bip);
|
|
}
|
|
|
|
|
|
/*
|
|
* Add the given log item with its callback to the list of callbacks
|
|
* to be called when the buffer's I/O completes. If it is not set
|
|
* already, set the buffer's b_iodone() routine to be
|
|
* xfs_buf_iodone_callbacks() and link the log item into the list of
|
|
* items rooted at b_fsprivate. Items are always added as the second
|
|
* entry in the list if there is a first, because the buf item code
|
|
* assumes that the buf log item is first.
|
|
*/
|
|
void
|
|
xfs_buf_attach_iodone(
|
|
xfs_buf_t *bp,
|
|
void (*cb)(xfs_buf_t *, xfs_log_item_t *),
|
|
xfs_log_item_t *lip)
|
|
{
|
|
xfs_log_item_t *head_lip;
|
|
|
|
ASSERT(xfs_buf_islocked(bp));
|
|
|
|
lip->li_cb = cb;
|
|
head_lip = bp->b_fspriv;
|
|
if (head_lip) {
|
|
lip->li_bio_list = head_lip->li_bio_list;
|
|
head_lip->li_bio_list = lip;
|
|
} else {
|
|
bp->b_fspriv = lip;
|
|
}
|
|
|
|
ASSERT(bp->b_iodone == NULL ||
|
|
bp->b_iodone == xfs_buf_iodone_callbacks);
|
|
bp->b_iodone = xfs_buf_iodone_callbacks;
|
|
}
|
|
|
|
/*
|
|
* We can have many callbacks on a buffer. Running the callbacks individually
|
|
* can cause a lot of contention on the AIL lock, so we allow for a single
|
|
* callback to be able to scan the remaining lip->li_bio_list for other items
|
|
* of the same type and callback to be processed in the first call.
|
|
*
|
|
* As a result, the loop walking the callback list below will also modify the
|
|
* list. it removes the first item from the list and then runs the callback.
|
|
* The loop then restarts from the new head of the list. This allows the
|
|
* callback to scan and modify the list attached to the buffer and we don't
|
|
* have to care about maintaining a next item pointer.
|
|
*/
|
|
STATIC void
|
|
xfs_buf_do_callbacks(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_log_item *lip;
|
|
|
|
while ((lip = bp->b_fspriv) != NULL) {
|
|
bp->b_fspriv = lip->li_bio_list;
|
|
ASSERT(lip->li_cb != NULL);
|
|
/*
|
|
* Clear the next pointer so we don't have any
|
|
* confusion if the item is added to another buf.
|
|
* Don't touch the log item after calling its
|
|
* callback, because it could have freed itself.
|
|
*/
|
|
lip->li_bio_list = NULL;
|
|
lip->li_cb(bp, lip);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the iodone() function for buffers which have had callbacks
|
|
* attached to them by xfs_buf_attach_iodone(). It should remove each
|
|
* log item from the buffer's list and call the callback of each in turn.
|
|
* When done, the buffer's fsprivate field is set to NULL and the buffer
|
|
* is unlocked with a call to iodone().
|
|
*/
|
|
void
|
|
xfs_buf_iodone_callbacks(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_log_item *lip = bp->b_fspriv;
|
|
struct xfs_mount *mp = lip->li_mountp;
|
|
static ulong lasttime;
|
|
static xfs_buftarg_t *lasttarg;
|
|
|
|
if (likely(!xfs_buf_geterror(bp)))
|
|
goto do_callbacks;
|
|
|
|
/*
|
|
* If we've already decided to shutdown the filesystem because of
|
|
* I/O errors, there's no point in giving this a retry.
|
|
*/
|
|
if (XFS_FORCED_SHUTDOWN(mp)) {
|
|
XFS_BUF_SUPER_STALE(bp);
|
|
trace_xfs_buf_item_iodone(bp, _RET_IP_);
|
|
goto do_callbacks;
|
|
}
|
|
|
|
if (bp->b_target != lasttarg ||
|
|
time_after(jiffies, (lasttime + 5*HZ))) {
|
|
lasttime = jiffies;
|
|
xfs_alert(mp, "Device %s: metadata write error block 0x%llx",
|
|
xfs_buf_target_name(bp->b_target),
|
|
(__uint64_t)XFS_BUF_ADDR(bp));
|
|
}
|
|
lasttarg = bp->b_target;
|
|
|
|
/*
|
|
* If the write was asynchronous then no one will be looking for the
|
|
* error. Clear the error state and write the buffer out again.
|
|
*
|
|
* During sync or umount we'll write all pending buffers again
|
|
* synchronous, which will catch these errors if they keep hanging
|
|
* around.
|
|
*/
|
|
if (XFS_BUF_ISASYNC(bp)) {
|
|
xfs_buf_ioerror(bp, 0); /* errno of 0 unsets the flag */
|
|
|
|
if (!XFS_BUF_ISSTALE(bp)) {
|
|
xfs_buf_delwri_queue(bp);
|
|
XFS_BUF_DONE(bp);
|
|
}
|
|
ASSERT(bp->b_iodone != NULL);
|
|
trace_xfs_buf_item_iodone_async(bp, _RET_IP_);
|
|
xfs_buf_relse(bp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the write of the buffer was synchronous, we want to make
|
|
* sure to return the error to the caller of xfs_bwrite().
|
|
*/
|
|
XFS_BUF_STALE(bp);
|
|
XFS_BUF_DONE(bp);
|
|
xfs_buf_delwri_dequeue(bp);
|
|
|
|
trace_xfs_buf_error_relse(bp, _RET_IP_);
|
|
|
|
do_callbacks:
|
|
xfs_buf_do_callbacks(bp);
|
|
bp->b_fspriv = NULL;
|
|
bp->b_iodone = NULL;
|
|
xfs_buf_ioend(bp, 0);
|
|
}
|
|
|
|
/*
|
|
* This is the iodone() function for buffers which have been
|
|
* logged. It is called when they are eventually flushed out.
|
|
* It should remove the buf item from the AIL, and free the buf item.
|
|
* It is called by xfs_buf_iodone_callbacks() above which will take
|
|
* care of cleaning up the buffer itself.
|
|
*/
|
|
void
|
|
xfs_buf_iodone(
|
|
struct xfs_buf *bp,
|
|
struct xfs_log_item *lip)
|
|
{
|
|
struct xfs_ail *ailp = lip->li_ailp;
|
|
|
|
ASSERT(BUF_ITEM(lip)->bli_buf == bp);
|
|
|
|
xfs_buf_rele(bp);
|
|
|
|
/*
|
|
* If we are forcibly shutting down, this may well be
|
|
* off the AIL already. That's because we simulate the
|
|
* log-committed callbacks to unpin these buffers. Or we may never
|
|
* have put this item on AIL because of the transaction was
|
|
* aborted forcibly. xfs_trans_ail_delete() takes care of these.
|
|
*
|
|
* Either way, AIL is useless if we're forcing a shutdown.
|
|
*/
|
|
spin_lock(&ailp->xa_lock);
|
|
xfs_trans_ail_delete(ailp, lip);
|
|
xfs_buf_item_free(BUF_ITEM(lip));
|
|
}
|