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-rw-r--r--fs/xfs/libxfs/xfs_ag.c6
-rw-r--r--fs/xfs/libxfs/xfs_inode_buf.c10
-rw-r--r--fs/xfs/libxfs/xfs_rtbitmap.c6
-rw-r--r--fs/xfs/libxfs/xfs_trans_inode.c2
-rw-r--r--fs/xfs/scrub/xfile.c1
-rw-r--r--fs/xfs/xfs_bmap_util.c7
-rw-r--r--fs/xfs/xfs_buf.c22
-rw-r--r--fs/xfs/xfs_buf.h3
-rw-r--r--fs/xfs/xfs_discard.c266
-rw-r--r--fs/xfs/xfs_discard.h6
-rw-r--r--fs/xfs/xfs_extent_busy.c35
-rw-r--r--fs/xfs/xfs_extent_busy.h24
-rw-r--r--fs/xfs/xfs_inode.c4
-rw-r--r--fs/xfs/xfs_inode_item.c4
-rw-r--r--fs/xfs/xfs_ioctl32.h2
-rw-r--r--fs/xfs/xfs_iops.c13
-rw-r--r--fs/xfs/xfs_itable.c12
-rw-r--r--fs/xfs/xfs_log_cil.c93
-rw-r--r--fs/xfs/xfs_log_priv.h5
-rw-r--r--fs/xfs/xfs_notify_failure.c6
-rw-r--r--fs/xfs/xfs_rtalloc.c30
-rw-r--r--fs/xfs/xfs_super.c42
-rw-r--r--fs/xfs/xfs_xattr.c2
-rw-r--r--fs/xfs/xfs_xattr.h2
24 files changed, 411 insertions, 192 deletions
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index e9cc481b4ddf..f9f4d694640d 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -1001,6 +1001,12 @@ xfs_ag_shrink_space(
error = -ENOSPC;
goto resv_init_out;
}
+
+ /* Update perag geometry */
+ pag->block_count -= delta;
+ __xfs_agino_range(pag->pag_mount, pag->block_count, &pag->agino_min,
+ &pag->agino_max);
+
xfs_ialloc_log_agi(*tpp, agibp, XFS_AGI_LENGTH);
xfs_alloc_log_agf(*tpp, agfbp, XFS_AGF_LENGTH);
return 0;
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index a35781577cad..543f3748c2a3 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -220,8 +220,10 @@ xfs_inode_from_disk(
* a time before epoch is converted to a time long after epoch
* on 64 bit systems.
*/
- inode->i_atime = xfs_inode_from_disk_ts(from, from->di_atime);
- inode->i_mtime = xfs_inode_from_disk_ts(from, from->di_mtime);
+ inode_set_atime_to_ts(inode,
+ xfs_inode_from_disk_ts(from, from->di_atime));
+ inode_set_mtime_to_ts(inode,
+ xfs_inode_from_disk_ts(from, from->di_mtime));
inode_set_ctime_to_ts(inode,
xfs_inode_from_disk_ts(from, from->di_ctime));
@@ -315,8 +317,8 @@ xfs_inode_to_disk(
to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
- to->di_atime = xfs_inode_to_disk_ts(ip, inode->i_atime);
- to->di_mtime = xfs_inode_to_disk_ts(ip, inode->i_mtime);
+ to->di_atime = xfs_inode_to_disk_ts(ip, inode_get_atime(inode));
+ to->di_mtime = xfs_inode_to_disk_ts(ip, inode_get_mtime(inode));
to->di_ctime = xfs_inode_to_disk_ts(ip, inode_get_ctime(inode));
to->di_nlink = cpu_to_be32(inode->i_nlink);
to->di_gen = cpu_to_be32(inode->i_generation);
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index fa180ab66b73..396648acb5be 100644
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -970,6 +970,7 @@ xfs_rtfree_extent(
xfs_mount_t *mp; /* file system mount structure */
xfs_fsblock_t sb; /* summary file block number */
struct xfs_buf *sumbp = NULL; /* summary file block buffer */
+ struct timespec64 atime;
mp = tp->t_mountp;
@@ -999,7 +1000,10 @@ xfs_rtfree_extent(
mp->m_sb.sb_rextents) {
if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM))
mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
- *(uint64_t *)&VFS_I(mp->m_rbmip)->i_atime = 0;
+
+ atime = inode_get_atime(VFS_I(mp->m_rbmip));
+ *((uint64_t *)&atime) = 0;
+ inode_set_atime_to_ts(VFS_I(mp->m_rbmip), atime);
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
}
return 0;
diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c
index 6b2296ff248a..70e97ea6eee7 100644
--- a/fs/xfs/libxfs/xfs_trans_inode.c
+++ b/fs/xfs/libxfs/xfs_trans_inode.c
@@ -65,7 +65,7 @@ xfs_trans_ichgtime(
tv = current_time(inode);
if (flags & XFS_ICHGTIME_MOD)
- inode->i_mtime = tv;
+ inode_set_mtime_to_ts(inode, tv);
if (flags & XFS_ICHGTIME_CHG)
inode_set_ctime_to_ts(inode, tv);
if (flags & XFS_ICHGTIME_CREATE)
diff --git a/fs/xfs/scrub/xfile.c b/fs/xfs/scrub/xfile.c
index d98e8e77c684..090c3ead43fd 100644
--- a/fs/xfs/scrub/xfile.c
+++ b/fs/xfs/scrub/xfile.c
@@ -10,7 +10,6 @@
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
-#include "xfs_format.h"
#include "scrub/xfile.h"
#include "scrub/xfarray.h"
#include "scrub/scrub.h"
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index fcefab687285..40e0a1f1f753 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1644,7 +1644,7 @@ xfs_swap_extents(
uint64_t f;
int resblks = 0;
unsigned int flags = 0;
- struct timespec64 ctime;
+ struct timespec64 ctime, mtime;
/*
* Lock the inodes against other IO, page faults and truncate to
@@ -1758,10 +1758,11 @@ xfs_swap_extents(
* under it.
*/
ctime = inode_get_ctime(VFS_I(ip));
+ mtime = inode_get_mtime(VFS_I(ip));
if ((sbp->bs_ctime.tv_sec != ctime.tv_sec) ||
(sbp->bs_ctime.tv_nsec != ctime.tv_nsec) ||
- (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) ||
- (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
+ (sbp->bs_mtime.tv_sec != mtime.tv_sec) ||
+ (sbp->bs_mtime.tv_nsec != mtime.tv_nsec)) {
error = -EBUSY;
goto out_trans_cancel;
}
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 9e7ba04572db..545c7991b9b5 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1943,8 +1943,6 @@ void
xfs_free_buftarg(
struct xfs_buftarg *btp)
{
- struct block_device *bdev = btp->bt_bdev;
-
shrinker_free(btp->bt_shrinker);
ASSERT(percpu_counter_sum(&btp->bt_io_count) == 0);
percpu_counter_destroy(&btp->bt_io_count);
@@ -1952,8 +1950,8 @@ xfs_free_buftarg(
fs_put_dax(btp->bt_daxdev, btp->bt_mount);
/* the main block device is closed by kill_block_super */
- if (bdev != btp->bt_mount->m_super->s_bdev)
- blkdev_put(bdev, btp->bt_mount->m_super);
+ if (btp->bt_bdev != btp->bt_mount->m_super->s_bdev)
+ bdev_release(btp->bt_bdev_handle);
kmem_free(btp);
}
@@ -1988,16 +1986,15 @@ xfs_setsize_buftarg(
*/
STATIC int
xfs_setsize_buftarg_early(
- xfs_buftarg_t *btp,
- struct block_device *bdev)
+ xfs_buftarg_t *btp)
{
- return xfs_setsize_buftarg(btp, bdev_logical_block_size(bdev));
+ return xfs_setsize_buftarg(btp, bdev_logical_block_size(btp->bt_bdev));
}
struct xfs_buftarg *
xfs_alloc_buftarg(
struct xfs_mount *mp,
- struct block_device *bdev)
+ struct bdev_handle *bdev_handle)
{
xfs_buftarg_t *btp;
const struct dax_holder_operations *ops = NULL;
@@ -2008,9 +2005,10 @@ xfs_alloc_buftarg(
btp = kmem_zalloc(sizeof(*btp), KM_NOFS);
btp->bt_mount = mp;
- btp->bt_dev = bdev->bd_dev;
- btp->bt_bdev = bdev;
- btp->bt_daxdev = fs_dax_get_by_bdev(bdev, &btp->bt_dax_part_off,
+ btp->bt_bdev_handle = bdev_handle;
+ btp->bt_dev = bdev_handle->bdev->bd_dev;
+ btp->bt_bdev = bdev_handle->bdev;
+ btp->bt_daxdev = fs_dax_get_by_bdev(btp->bt_bdev, &btp->bt_dax_part_off,
mp, ops);
/*
@@ -2020,7 +2018,7 @@ xfs_alloc_buftarg(
ratelimit_state_init(&btp->bt_ioerror_rl, 30 * HZ,
DEFAULT_RATELIMIT_BURST);
- if (xfs_setsize_buftarg_early(btp, bdev))
+ if (xfs_setsize_buftarg_early(btp))
goto error_free;
if (list_lru_init(&btp->bt_lru))
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 702e7d9ea2ac..c86e16419656 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -98,6 +98,7 @@ typedef unsigned int xfs_buf_flags_t;
*/
typedef struct xfs_buftarg {
dev_t bt_dev;
+ struct bdev_handle *bt_bdev_handle;
struct block_device *bt_bdev;
struct dax_device *bt_daxdev;
u64 bt_dax_part_off;
@@ -364,7 +365,7 @@ xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
* Handling of buftargs.
*/
struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *mp,
- struct block_device *bdev);
+ struct bdev_handle *bdev_handle);
extern void xfs_free_buftarg(struct xfs_buftarg *);
extern void xfs_buftarg_wait(struct xfs_buftarg *);
extern void xfs_buftarg_drain(struct xfs_buftarg *);
diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
index afc4c78b9eed..d5787991bb5b 100644
--- a/fs/xfs/xfs_discard.c
+++ b/fs/xfs/xfs_discard.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Copyright (C) 2010 Red Hat, Inc.
+ * Copyright (C) 2010, 2023 Red Hat, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
@@ -19,21 +19,147 @@
#include "xfs_log.h"
#include "xfs_ag.h"
-STATIC int
-xfs_trim_extents(
+/*
+ * Notes on an efficient, low latency fstrim algorithm
+ *
+ * We need to walk the filesystem free space and issue discards on the free
+ * space that meet the search criteria (size and location). We cannot issue
+ * discards on extents that might be in use, or are so recently in use they are
+ * still marked as busy. To serialise against extent state changes whilst we are
+ * gathering extents to trim, we must hold the AGF lock to lock out other
+ * allocations and extent free operations that might change extent state.
+ *
+ * However, we cannot just hold the AGF for the entire AG free space walk whilst
+ * we issue discards on each free space that is found. Storage devices can have
+ * extremely slow discard implementations (e.g. ceph RBD) and so walking a
+ * couple of million free extents and issuing synchronous discards on each
+ * extent can take a *long* time. Whilst we are doing this walk, nothing else
+ * can access the AGF, and we can stall transactions and hence the log whilst
+ * modifications wait for the AGF lock to be released. This can lead hung tasks
+ * kicking the hung task timer and rebooting the system. This is bad.
+ *
+ * Hence we need to take a leaf from the bulkstat playbook. It takes the AGI
+ * lock, gathers a range of inode cluster buffers that are allocated, drops the
+ * AGI lock and then reads all the inode cluster buffers and processes them. It
+ * loops doing this, using a cursor to keep track of where it is up to in the AG
+ * for each iteration to restart the INOBT lookup from.
+ *
+ * We can't do this exactly with free space - once we drop the AGF lock, the
+ * state of the free extent is out of our control and we cannot run a discard
+ * safely on it in this situation. Unless, of course, we've marked the free
+ * extent as busy and undergoing a discard operation whilst we held the AGF
+ * locked.
+ *
+ * This is exactly how online discard works - free extents are marked busy when
+ * they are freed, and once the extent free has been committed to the journal,
+ * the busy extent record is marked as "undergoing discard" and the discard is
+ * then issued on the free extent. Once the discard completes, the busy extent
+ * record is removed and the extent is able to be allocated again.
+ *
+ * In the context of fstrim, if we find a free extent we need to discard, we
+ * don't have to discard it immediately. All we need to do it record that free
+ * extent as being busy and under discard, and all the allocation routines will
+ * now avoid trying to allocate it. Hence if we mark the extent as busy under
+ * the AGF lock, we can safely discard it without holding the AGF lock because
+ * nothing will attempt to allocate that free space until the discard completes.
+ *
+ * This also allows us to issue discards asynchronously like we do with online
+ * discard, and so for fast devices fstrim will run much faster as we can have
+ * multiple discard operations in flight at once, as well as pipeline the free
+ * extent search so that it overlaps in flight discard IO.
+ */
+
+struct workqueue_struct *xfs_discard_wq;
+
+static void
+xfs_discard_endio_work(
+ struct work_struct *work)
+{
+ struct xfs_busy_extents *extents =
+ container_of(work, struct xfs_busy_extents, endio_work);
+
+ xfs_extent_busy_clear(extents->mount, &extents->extent_list, false);
+ kmem_free(extents->owner);
+}
+
+/*
+ * Queue up the actual completion to a thread to avoid IRQ-safe locking for
+ * pagb_lock.
+ */
+static void
+xfs_discard_endio(
+ struct bio *bio)
+{
+ struct xfs_busy_extents *extents = bio->bi_private;
+
+ INIT_WORK(&extents->endio_work, xfs_discard_endio_work);
+ queue_work(xfs_discard_wq, &extents->endio_work);
+ bio_put(bio);
+}
+
+/*
+ * Walk the discard list and issue discards on all the busy extents in the
+ * list. We plug and chain the bios so that we only need a single completion
+ * call to clear all the busy extents once the discards are complete.
+ */
+int
+xfs_discard_extents(
+ struct xfs_mount *mp,
+ struct xfs_busy_extents *extents)
+{
+ struct xfs_extent_busy *busyp;
+ struct bio *bio = NULL;
+ struct blk_plug plug;
+ int error = 0;
+
+ blk_start_plug(&plug);
+ list_for_each_entry(busyp, &extents->extent_list, list) {
+ trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
+ busyp->length);
+
+ error = __blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
+ XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
+ XFS_FSB_TO_BB(mp, busyp->length),
+ GFP_NOFS, &bio);
+ if (error && error != -EOPNOTSUPP) {
+ xfs_info(mp,
+ "discard failed for extent [0x%llx,%u], error %d",
+ (unsigned long long)busyp->bno,
+ busyp->length,
+ error);
+ break;
+ }
+ }
+
+ if (bio) {
+ bio->bi_private = extents;
+ bio->bi_end_io = xfs_discard_endio;
+ submit_bio(bio);
+ } else {
+ xfs_discard_endio_work(&extents->endio_work);
+ }
+ blk_finish_plug(&plug);
+
+ return error;
+}
+
+
+static int
+xfs_trim_gather_extents(
struct xfs_perag *pag,
xfs_daddr_t start,
xfs_daddr_t end,
xfs_daddr_t minlen,
+ struct xfs_alloc_rec_incore *tcur,
+ struct xfs_busy_extents *extents,
uint64_t *blocks_trimmed)
{
struct xfs_mount *mp = pag->pag_mount;
- struct block_device *bdev = mp->m_ddev_targp->bt_bdev;
struct xfs_btree_cur *cur;
struct xfs_buf *agbp;
- struct xfs_agf *agf;
int error;
int i;
+ int batch = 100;
/*
* Force out the log. This means any transactions that might have freed
@@ -45,20 +171,28 @@ xfs_trim_extents(
error = xfs_alloc_read_agf(pag, NULL, 0, &agbp);
if (error)
return error;
- agf = agbp->b_addr;
cur = xfs_allocbt_init_cursor(mp, NULL, agbp, pag, XFS_BTNUM_CNT);
/*
- * Look up the longest btree in the AGF and start with it.
+ * Look up the extent length requested in the AGF and start with it.
*/
- error = xfs_alloc_lookup_ge(cur, 0, be32_to_cpu(agf->agf_longest), &i);
+ if (tcur->ar_startblock == NULLAGBLOCK)
+ error = xfs_alloc_lookup_ge(cur, 0, tcur->ar_blockcount, &i);
+ else
+ error = xfs_alloc_lookup_le(cur, tcur->ar_startblock,
+ tcur->ar_blockcount, &i);
if (error)
goto out_del_cursor;
+ if (i == 0) {
+ /* nothing of that length left in the AG, we are done */
+ tcur->ar_blockcount = 0;
+ goto out_del_cursor;
+ }
/*
* Loop until we are done with all extents that are large
- * enough to be worth discarding.
+ * enough to be worth discarding or we hit batch limits.
*/
while (i) {
xfs_agblock_t fbno;
@@ -73,7 +207,16 @@ xfs_trim_extents(
error = -EFSCORRUPTED;
break;
}
- ASSERT(flen <= be32_to_cpu(agf->agf_longest));
+
+ if (--batch <= 0) {
+ /*
+ * Update the cursor to point at this extent so we
+ * restart the next batch from this extent.
+ */
+ tcur->ar_startblock = fbno;
+ tcur->ar_blockcount = flen;
+ break;
+ }
/*
* use daddr format for all range/len calculations as that is
@@ -88,6 +231,7 @@ xfs_trim_extents(
*/
if (dlen < minlen) {
trace_xfs_discard_toosmall(mp, pag->pag_agno, fbno, flen);
+ tcur->ar_blockcount = 0;
break;
}
@@ -110,29 +254,103 @@ xfs_trim_extents(
goto next_extent;
}
- trace_xfs_discard_extent(mp, pag->pag_agno, fbno, flen);
- error = blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS);
- if (error)
- break;
+ xfs_extent_busy_insert_discard(pag, fbno, flen,
+ &extents->extent_list);
*blocks_trimmed += flen;
-
next_extent:
error = xfs_btree_decrement(cur, 0, &i);
if (error)
break;
- if (fatal_signal_pending(current)) {
- error = -ERESTARTSYS;
- break;
- }
+ /*
+ * If there's no more records in the tree, we are done. Set the
+ * cursor block count to 0 to indicate to the caller that there
+ * is no more extents to search.
+ */
+ if (i == 0)
+ tcur->ar_blockcount = 0;
}
+ /*
+ * If there was an error, release all the gathered busy extents because
+ * we aren't going to issue a discard on them any more.
+ */
+ if (error)
+ xfs_extent_busy_clear(mp, &extents->extent_list, false);
out_del_cursor:
xfs_btree_del_cursor(cur, error);
xfs_buf_relse(agbp);
return error;
}
+static bool
+xfs_trim_should_stop(void)
+{
+ return fatal_signal_pending(current) || freezing(current);
+}
+
+/*
+ * Iterate the free list gathering extents and discarding them. We need a cursor
+ * for the repeated iteration of gather/discard loop, so use the longest extent
+ * we found in the last batch as the key to start the next.
+ */
+static int
+xfs_trim_extents(
+ struct xfs_perag *pag,
+ xfs_daddr_t start,
+ xfs_daddr_t end,
+ xfs_daddr_t minlen,
+ uint64_t *blocks_trimmed)
+{
+ struct xfs_alloc_rec_incore tcur = {
+ .ar_blockcount = pag->pagf_longest,
+ .ar_startblock = NULLAGBLOCK,
+ };
+ int error = 0;
+
+ do {
+ struct xfs_busy_extents *extents;
+
+ extents = kzalloc(sizeof(*extents), GFP_KERNEL);
+ if (!extents) {
+ error = -ENOMEM;
+ break;
+ }
+
+ extents->mount = pag->pag_mount;
+ extents->owner = extents;
+ INIT_LIST_HEAD(&extents->extent_list);
+
+ error = xfs_trim_gather_extents(pag, start, end, minlen,
+ &tcur, extents, blocks_trimmed);
+ if (error) {
+ kfree(extents);
+ break;
+ }
+
+ /*
+ * We hand the extent list to the discard function here so the
+ * discarded extents can be removed from the busy extent list.
+ * This allows the discards to run asynchronously with gathering
+ * the next round of extents to discard.
+ *
+ * However, we must ensure that we do not reference the extent
+ * list after this function call, as it may have been freed by
+ * the time control returns to us.
+ */
+ error = xfs_discard_extents(pag->pag_mount, extents);
+ if (error)
+ break;
+
+ if (xfs_trim_should_stop())
+ break;
+
+ } while (tcur.ar_blockcount != 0);
+
+ return error;
+
+}
+
/*
* trim a range of the filesystem.
*
@@ -195,12 +413,12 @@ xfs_ioc_trim(
for_each_perag_range(mp, agno, xfs_daddr_to_agno(mp, end), pag) {
error = xfs_trim_extents(pag, start, end, minlen,
&blocks_trimmed);
- if (error) {
+ if (error)
last_error = error;
- if (error == -ERESTARTSYS) {
- xfs_perag_rele(pag);
- break;
- }
+
+ if (xfs_trim_should_stop()) {
+ xfs_perag_rele(pag);
+ break;
}
}
diff --git a/fs/xfs/xfs_discard.h b/fs/xfs/xfs_discard.h
index de92d9cc958f..2b1a85223a56 100644
--- a/fs/xfs/xfs_discard.h
+++ b/fs/xfs/xfs_discard.h
@@ -3,8 +3,10 @@
#define XFS_DISCARD_H 1
struct fstrim_range;
-struct list_head;
+struct xfs_mount;
+struct xfs_busy_extents;
-extern int xfs_ioc_trim(struct xfs_mount *, struct fstrim_range __user *);
+int xfs_discard_extents(struct xfs_mount *mp, struct xfs_busy_extents *busy);
+int xfs_ioc_trim(struct xfs_mount *mp, struct fstrim_range __user *fstrim);
#endif /* XFS_DISCARD_H */
diff --git a/fs/xfs/xfs_extent_busy.c b/fs/xfs/xfs_extent_busy.c
index 7c2fdc71e42d..9ecfdcdc752f 100644
--- a/fs/xfs/xfs_extent_busy.c
+++ b/fs/xfs/xfs_extent_busy.c
@@ -19,13 +19,13 @@
#include "xfs_log.h"
#include "xfs_ag.h"
-void
-xfs_extent_busy_insert(
- struct xfs_trans *tp,
+static void
+xfs_extent_busy_insert_list(
struct xfs_perag *pag,
xfs_agblock_t bno,
xfs_extlen_t len,
- unsigned int flags)
+ unsigned int flags,
+ struct list_head *busy_list)
{
struct xfs_extent_busy *new;
struct xfs_extent_busy *busyp;
@@ -40,7 +40,7 @@ xfs_extent_busy_insert(
new->flags = flags;
/* trace before insert to be able to see failed inserts */
- trace_xfs_extent_busy(tp->t_mountp, pag->pag_agno, bno, len);
+ trace_xfs_extent_busy(pag->pag_mount, pag->pag_agno, bno, len);
spin_lock(&pag->pagb_lock);
rbp = &pag->pagb_tree.rb_node;
@@ -62,10 +62,33 @@ xfs_extent_busy_insert(
rb_link_node(&new->rb_node, parent, rbp);
rb_insert_color(&new->rb_node, &pag->pagb_tree);
- list_add(&new->list, &tp->t_busy);
+ /* always process discard lists in fifo order */
+ list_add_tail(&new->list, busy_list);
spin_unlock(&pag->pagb_lock);
}
+void
+xfs_extent_busy_insert(
+ struct xfs_trans *tp,
+ struct xfs_perag *pag,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ unsigned int flags)
+{
+ xfs_extent_busy_insert_list(pag, bno, len, flags, &tp->t_busy);
+}
+
+void
+xfs_extent_busy_insert_discard(
+ struct xfs_perag *pag,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ struct list_head *busy_list)
+{
+ xfs_extent_busy_insert_list(pag, bno, len, XFS_EXTENT_BUSY_DISCARDED,
+ busy_list);
+}
+
/*
* Search for a busy extent within the range of the extent we are about to
* allocate. You need to be holding the busy extent tree lock when calling
diff --git a/fs/xfs/xfs_extent_busy.h b/fs/xfs/xfs_extent_busy.h
index c37bf87e6781..0639aab336f3 100644
--- a/fs/xfs/xfs_extent_busy.h
+++ b/fs/xfs/xfs_extent_busy.h
@@ -16,9 +16,6 @@ struct xfs_alloc_arg;
/*
* Busy block/extent entry. Indexed by a rbtree in perag to mark blocks that
* have been freed but whose transactions aren't committed to disk yet.
- *
- * Note that we use the transaction ID to record the transaction, not the
- * transaction structure itself. See xfs_extent_busy_insert() for details.
*/
struct xfs_extent_busy {
struct rb_node rb_node; /* ag by-bno indexed search tree */
@@ -31,11 +28,32 @@ struct xfs_extent_busy {
#define XFS_EXTENT_BUSY_SKIP_DISCARD 0x02 /* do not discard */
};
+/*
+ * List used to track groups of related busy extents all the way through
+ * to discard completion.
+ */
+struct xfs_busy_extents {
+ struct xfs_mount *mount;
+ struct list_head extent_list;
+ struct work_struct endio_work;
+
+ /*
+ * Owner is the object containing the struct xfs_busy_extents to free
+ * once the busy extents have been processed. If only the
+ * xfs_busy_extents object needs freeing, then point this at itself.
+ */
+ void *owner;
+};
+
void
xfs_extent_busy_insert(struct xfs_trans *tp, struct xfs_perag *pag,
xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);
void
+xfs_extent_busy_insert_discard(struct xfs_perag *pag, xfs_agblock_t bno,
+ xfs_extlen_t len, struct list_head *busy_list);
+
+void
xfs_extent_busy_clear(struct xfs_mount *mp, struct list_head *list,
bool do_discard);
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 4d55f58d99b7..36f5cf802c07 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -844,8 +844,8 @@ xfs_init_new_inode(
ASSERT(ip->i_nblocks == 0);
tv = inode_set_ctime_current(inode);
- inode->i_mtime = tv;
- inode->i_atime = tv;
+ inode_set_mtime_to_ts(inode, tv);
+ inode_set_atime_to_ts(inode, tv);
ip->i_extsize = 0;
ip->i_diflags = 0;
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 127b2410eb20..17c51804f9c6 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -526,8 +526,8 @@ xfs_inode_to_log_dinode(
to->di_projid_hi = ip->i_projid >> 16;
memset(to->di_pad3, 0, sizeof(to->di_pad3));
- to->di_atime = xfs_inode_to_log_dinode_ts(ip, inode->i_atime);
- to->di_mtime = xfs_inode_to_log_dinode_ts(ip, inode->i_mtime);
+ to->di_atime = xfs_inode_to_log_dinode_ts(ip, inode_get_atime(inode));
+ to->di_mtime = xfs_inode_to_log_dinode_ts(ip, inode_get_mtime(inode));
to->di_ctime = xfs_inode_to_log_dinode_ts(ip, inode_get_ctime(inode));
to->di_nlink = inode->i_nlink;
to->di_gen = inode->i_generation;
diff --git a/fs/xfs/xfs_ioctl32.h b/fs/xfs/xfs_ioctl32.h
index c14852362fce..052d0e888c27 100644
--- a/fs/xfs/xfs_ioctl32.h
+++ b/fs/xfs/xfs_ioctl32.h
@@ -22,7 +22,7 @@
/*
* On intel, even if sizes match, alignment and/or padding may differ.
*/
-#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
+#if defined(CONFIG_X86_64)
#define BROKEN_X86_ALIGNMENT
#define __compat_packed __attribute__((packed))
#else
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 1c1e6171209d..fdfda4fba12b 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -572,8 +572,8 @@ xfs_vn_getattr(
stat->uid = vfsuid_into_kuid(vfsuid);
stat->gid = vfsgid_into_kgid(vfsgid);
stat->ino = ip->i_ino;
- stat->atime = inode->i_atime;
- stat->mtime = inode->i_mtime;
+ stat->atime = inode_get_atime(inode);
+ stat->mtime = inode_get_mtime(inode);
stat->ctime = inode_get_ctime(inode);
stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
@@ -584,6 +584,11 @@ xfs_vn_getattr(
}
}
+ if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
+ stat->change_cookie = inode_query_iversion(inode);
+ stat->result_mask |= STATX_CHANGE_COOKIE;
+ }
+
/*
* Note: If you add another clause to set an attribute flag, please
* update attributes_mask below.
@@ -1062,9 +1067,9 @@ xfs_vn_update_time(
now = current_time(inode);
if (flags & S_MTIME)
- inode->i_mtime = now;
+ inode_set_mtime_to_ts(inode, now);
if (flags & S_ATIME)
- inode->i_atime = now;
+ inode_set_atime_to_ts(inode, now);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, log_flags);
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index f5377ba5967a..14462614fcc8 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -107,12 +107,12 @@ xfs_bulkstat_one_int(
buf->bs_size = ip->i_disk_size;
buf->bs_nlink = inode->i_nlink;
- buf->bs_atime = inode->i_atime.tv_sec;
- buf->bs_atime_nsec = inode->i_atime.tv_nsec;
- buf->bs_mtime = inode->i_mtime.tv_sec;
- buf->bs_mtime_nsec = inode->i_mtime.tv_nsec;
- buf->bs_ctime = inode_get_ctime(inode).tv_sec;
- buf->bs_ctime_nsec = inode_get_ctime(inode).tv_nsec;
+ buf->bs_atime = inode_get_atime_sec(inode);
+ buf->bs_atime_nsec = inode_get_atime_nsec(inode);
+ buf->bs_mtime = inode_get_mtime_sec(inode);
+ buf->bs_mtime_nsec = inode_get_mtime_nsec(inode);
+ buf->bs_ctime = inode_get_ctime_sec(inode);
+ buf->bs_ctime_nsec = inode_get_ctime_nsec(inode);
buf->bs_gen = inode->i_generation;
buf->bs_mode = inode->i_mode;
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index ebc70aaa299c..67a99d94701e 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -16,8 +16,7 @@
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_trace.h"
-
-struct workqueue_struct *xfs_discard_wq;
+#include "xfs_discard.h"
/*
* Allocate a new ticket. Failing to get a new ticket makes it really hard to
@@ -103,7 +102,7 @@ xlog_cil_ctx_alloc(void)
ctx = kmem_zalloc(sizeof(*ctx), KM_NOFS);
INIT_LIST_HEAD(&ctx->committing);
- INIT_LIST_HEAD(&ctx->busy_extents);
+ INIT_LIST_HEAD(&ctx->busy_extents.extent_list);
INIT_LIST_HEAD(&ctx->log_items);
INIT_LIST_HEAD(&ctx->lv_chain);
INIT_WORK(&ctx->push_work, xlog_cil_push_work);
@@ -132,7 +131,7 @@ xlog_cil_push_pcp_aggregate(
if (!list_empty(&cilpcp->busy_extents)) {
list_splice_init(&cilpcp->busy_extents,
- &ctx->busy_extents);
+ &ctx->busy_extents.extent_list);
}
if (!list_empty(&cilpcp->log_items))
list_splice_init(&cilpcp->log_items, &ctx->log_items);
@@ -708,76 +707,6 @@ xlog_cil_free_logvec(
}
}
-static void
-xlog_discard_endio_work(
- struct work_struct *work)
-{
- struct xfs_cil_ctx *ctx =
- container_of(work, struct xfs_cil_ctx, discard_endio_work);
- struct xfs_mount *mp = ctx->cil->xc_log->l_mp;
-
- xfs_extent_busy_clear(mp, &ctx->busy_extents, false);
- kmem_free(ctx);
-}
-
-/*
- * Queue up the actual completion to a thread to avoid IRQ-safe locking for
- * pagb_lock. Note that we need a unbounded workqueue, otherwise we might
- * get the execution delayed up to 30 seconds for weird reasons.
- */
-static void
-xlog_discard_endio(
- struct bio *bio)
-{
- struct xfs_cil_ctx *ctx = bio->bi_private;
-
- INIT_WORK(&ctx->discard_endio_work, xlog_discard_endio_work);
- queue_work(xfs_discard_wq, &ctx->discard_endio_work);
- bio_put(bio);
-}
-
-static void
-xlog_discard_busy_extents(
- struct xfs_mount *mp,
- struct xfs_cil_ctx *ctx)
-{
- struct list_head *list = &ctx->busy_extents;
- struct xfs_extent_busy *busyp;
- struct bio *bio = NULL;
- struct blk_plug plug;
- int error = 0;
-
- ASSERT(xfs_has_discard(mp));
-
- blk_start_plug(&plug);
- list_for_each_entry(busyp, list, list) {
- trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
- busyp->length);
-
- error = __blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
- XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
- XFS_FSB_TO_BB(mp, busyp->length),
- GFP_NOFS, &bio);
- if (error && error != -EOPNOTSUPP) {
- xfs_info(mp,
- "discard failed for extent [0x%llx,%u], error %d",
- (unsigned long long)busyp->bno,
- busyp->length,
- error);
- break;
- }
- }
-
- if (bio) {
- bio->bi_private = ctx;
- bio->bi_end_io = xlog_discard_endio;
- submit_bio(bio);
- } else {
- xlog_discard_endio_work(&ctx->discard_endio_work);
- }
- blk_finish_plug(&plug);
-}
-
/*
* Mark all items committed and clear busy extents. We free the log vector
* chains in a separate pass so that we unpin the log items as quickly as
@@ -807,8 +736,8 @@ xlog_cil_committed(
xfs_trans_committed_bulk(ctx->cil->xc_log->l_ailp, &ctx->lv_chain,
ctx->start_lsn, abort);
- xfs_extent_busy_sort(&ctx->busy_extents);
- xfs_extent_busy_clear(mp, &ctx->busy_extents,
+ xfs_extent_busy_sort(&ctx->busy_extents.extent_list);
+ xfs_extent_busy_clear(mp, &ctx->busy_extents.extent_list,
xfs_has_discard(mp) && !abort);
spin_lock(&ctx->cil->xc_push_lock);
@@ -817,10 +746,14 @@ xlog_cil_committed(
xlog_cil_free_logvec(&ctx->lv_chain);
- if (!list_empty(&ctx->busy_extents))
- xlog_discard_busy_extents(mp, ctx);
- else
- kmem_free(ctx);
+ if (!list_empty(&ctx->busy_extents.extent_list)) {
+ ctx->busy_extents.mount = mp;
+ ctx->busy_extents.owner = ctx;
+ xfs_discard_extents(mp, &ctx->busy_extents);
+ return;
+ }
+
+ kmem_free(ctx);
}
void
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index af87648331d5..fa3ad1d7b31c 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -6,6 +6,8 @@
#ifndef __XFS_LOG_PRIV_H__
#define __XFS_LOG_PRIV_H__
+#include "xfs_extent_busy.h" /* for struct xfs_busy_extents */
+
struct xfs_buf;
struct xlog;
struct xlog_ticket;
@@ -223,12 +225,11 @@ struct xfs_cil_ctx {
struct xlog_in_core *commit_iclog;
struct xlog_ticket *ticket; /* chkpt ticket */
atomic_t space_used; /* aggregate size of regions */
- struct list_head busy_extents; /* busy extents in chkpt */
+ struct xfs_busy_extents busy_extents;
struct list_head log_items; /* log items in chkpt */
struct list_head lv_chain; /* logvecs being pushed */
struct list_head iclog_entry;
struct list_head committing; /* ctx committing list */
- struct work_struct discard_endio_work;
struct work_struct push_work;
atomic_t order_id;
diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c
index 4a9bbd3fe120..a7daa522e00f 100644
--- a/fs/xfs/xfs_notify_failure.c
+++ b/fs/xfs/xfs_notify_failure.c
@@ -126,8 +126,8 @@ xfs_dax_notify_ddev_failure(
struct xfs_rmap_irec ri_low = { };
struct xfs_rmap_irec ri_high;
struct xfs_agf *agf;
- xfs_agblock_t agend;
struct xfs_perag *pag;
+ xfs_agblock_t range_agend;
pag = xfs_perag_get(mp, agno);
error = xfs_alloc_read_agf(pag, tp, 0, &agf_bp);
@@ -148,10 +148,10 @@ xfs_dax_notify_ddev_failure(
ri_high.rm_startblock = XFS_FSB_TO_AGBNO(mp, end_fsbno);
agf = agf_bp->b_addr;
- agend = min(be32_to_cpu(agf->agf_length),
+ range_agend = min(be32_to_cpu(agf->agf_length) - 1,
ri_high.rm_startblock);
notify.startblock = ri_low.rm_startblock;
- notify.blockcount = agend - ri_low.rm_startblock;
+ notify.blockcount = range_agend + 1 - ri_low.rm_startblock;
error = xfs_rmap_query_range(cur, &ri_low, &ri_high,
xfs_dax_failure_fn, &notify);
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 16534e9873f6..2e1a4e5cd03d 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1420,25 +1420,26 @@ xfs_rtunmount_inodes(
*/
int /* error */
xfs_rtpick_extent(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_extlen_t len, /* allocation length (rtextents) */
- xfs_rtblock_t *pick) /* result rt extent */
-{
- xfs_rtblock_t b; /* result block */
- int log2; /* log of sequence number */
- uint64_t resid; /* residual after log removed */
- uint64_t seq; /* sequence number of file creation */
- uint64_t *seqp; /* pointer to seqno in inode */
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_extlen_t len, /* allocation length (rtextents) */
+ xfs_rtblock_t *pick) /* result rt extent */
+ {
+ xfs_rtblock_t b; /* result block */
+ int log2; /* log of sequence number */
+ uint64_t resid; /* residual after log removed */
+ uint64_t seq; /* sequence number of file creation */
+ struct timespec64 ts; /* temporary timespec64 storage */
ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
- seqp = (uint64_t *)&VFS_I(mp->m_rbmip)->i_atime;
if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
- *seqp = 0;
+ seq = 0;
+ } else {
+ ts = inode_get_atime(VFS_I(mp->m_rbmip));
+ seq = (uint64_t)ts.tv_sec;
}
- seq = *seqp;
if ((log2 = xfs_highbit64(seq)) == -1)
b = 0;
else {
@@ -1450,7 +1451,8 @@ xfs_rtpick_extent(
if (b + len > mp->m_sb.sb_rextents)
b = mp->m_sb.sb_rextents - len;
}
- *seqp = seq + 1;
+ ts.tv_sec = (time64_t)seq + 1;
+ inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts);
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
*pick = b;
return 0;
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 819a3568b28f..f0ae07828153 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -361,14 +361,15 @@ STATIC int
xfs_blkdev_get(
xfs_mount_t *mp,
const char *name,
- struct block_device **bdevp)
+ struct bdev_handle **handlep)
{
int error = 0;
- *bdevp = blkdev_get_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
- mp->m_super, &fs_holder_ops);
- if (IS_ERR(*bdevp)) {
- error = PTR_ERR(*bdevp);
+ *handlep = bdev_open_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
+ mp->m_super, &fs_holder_ops);
+ if (IS_ERR(*handlep)) {
+ error = PTR_ERR(*handlep);
+ *handlep = NULL;
xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
}
@@ -433,7 +434,7 @@ xfs_open_devices(
{
struct super_block *sb = mp->m_super;
struct block_device *ddev = sb->s_bdev;
- struct block_device *logdev = NULL, *rtdev = NULL;
+ struct bdev_handle *logdev_handle = NULL, *rtdev_handle = NULL;
int error;
/*
@@ -446,17 +447,19 @@ xfs_open_devices(
* Open real time and log devices - order is important.
*/
if (mp->m_logname) {
- error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
+ error = xfs_blkdev_get(mp, mp->m_logname, &logdev_handle);
if (error)
goto out_relock;
}
if (mp->m_rtname) {
- error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
+ error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev_handle);
if (error)
goto out_close_logdev;
- if (rtdev == ddev || rtdev == logdev) {
+ if (rtdev_handle->bdev == ddev ||
+ (logdev_handle &&
+ rtdev_handle->bdev == logdev_handle->bdev)) {
xfs_warn(mp,
"Cannot mount filesystem with identical rtdev and ddev/logdev.");
error = -EINVAL;
@@ -468,22 +471,25 @@ xfs_open_devices(
* Setup xfs_mount buffer target pointers
*/
error = -ENOMEM;
- mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
+ mp->m_ddev_targp = xfs_alloc_buftarg(mp, sb->s_bdev_handle);
if (!mp->m_ddev_targp)
goto out_close_rtdev;
- if (rtdev) {
- mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
+ if (rtdev_handle) {
+ mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev_handle);
if (!mp->m_rtdev_targp)
goto out_free_ddev_targ;
}
- if (logdev && logdev != ddev) {
- mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
+ if (logdev_handle && logdev_handle->bdev != ddev) {
+ mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev_handle);
if (!mp->m_logdev_targp)
goto out_free_rtdev_targ;
} else {
mp->m_logdev_targp = mp->m_ddev_targp;
+ /* Handle won't be used, drop it */
+ if (logdev_handle)
+ bdev_release(logdev_handle);
}
error = 0;
@@ -497,11 +503,11 @@ out_relock:
out_free_ddev_targ:
xfs_free_buftarg(mp->m_ddev_targp);
out_close_rtdev:
- if (rtdev)
- blkdev_put(rtdev, sb);
+ if (rtdev_handle)
+ bdev_release(rtdev_handle);
out_close_logdev:
- if (logdev && logdev != ddev)
- blkdev_put(logdev, sb);
+ if (logdev_handle)
+ bdev_release(logdev_handle);
goto out_relock;
}
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index a3975f325f4e..987843f84d03 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -186,7 +186,7 @@ static const struct xattr_handler xfs_xattr_security_handler = {
.set = xfs_xattr_set,
};
-const struct xattr_handler *xfs_xattr_handlers[] = {
+const struct xattr_handler * const xfs_xattr_handlers[] = {
&xfs_xattr_user_handler,
&xfs_xattr_trusted_handler,
&xfs_xattr_security_handler,
diff --git a/fs/xfs/xfs_xattr.h b/fs/xfs/xfs_xattr.h
index 2b09133b1b9b..cec766cad26c 100644
--- a/fs/xfs/xfs_xattr.h
+++ b/fs/xfs/xfs_xattr.h
@@ -8,6 +8,6 @@
int xfs_attr_change(struct xfs_da_args *args);
-extern const struct xattr_handler *xfs_xattr_handlers[];
+extern const struct xattr_handler * const xfs_xattr_handlers[];
#endif /* __XFS_XATTR_H__ */
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