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-rw-r--r--fs/xfs/libxfs/xfs_bmap.c157
-rw-r--r--fs/xfs/libxfs/xfs_dir2_node.c4
-rw-r--r--fs/xfs/xfs_aops.c9
-rw-r--r--fs/xfs/xfs_mount.h25
-rw-r--r--fs/xfs/xfs_sysfs.c78
-rw-r--r--fs/xfs/xfs_trans.c4
6 files changed, 221 insertions, 56 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 79e898cb5562..041b6948aecc 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -4718,6 +4718,66 @@ error0:
}
/*
+ * When a delalloc extent is split (e.g., due to a hole punch), the original
+ * indlen reservation must be shared across the two new extents that are left
+ * behind.
+ *
+ * Given the original reservation and the worst case indlen for the two new
+ * extents (as calculated by xfs_bmap_worst_indlen()), split the original
+ * reservation fairly across the two new extents. If necessary, steal available
+ * blocks from a deleted extent to make up a reservation deficiency (e.g., if
+ * ores == 1). The number of stolen blocks is returned. The availability and
+ * subsequent accounting of stolen blocks is the responsibility of the caller.
+ */
+static xfs_filblks_t
+xfs_bmap_split_indlen(
+ xfs_filblks_t ores, /* original res. */
+ xfs_filblks_t *indlen1, /* ext1 worst indlen */
+ xfs_filblks_t *indlen2, /* ext2 worst indlen */
+ xfs_filblks_t avail) /* stealable blocks */
+{
+ xfs_filblks_t len1 = *indlen1;
+ xfs_filblks_t len2 = *indlen2;
+ xfs_filblks_t nres = len1 + len2; /* new total res. */
+ xfs_filblks_t stolen = 0;
+
+ /*
+ * Steal as many blocks as we can to try and satisfy the worst case
+ * indlen for both new extents.
+ */
+ while (nres > ores && avail) {
+ nres--;
+ avail--;
+ stolen++;
+ }
+
+ /*
+ * The only blocks available are those reserved for the original
+ * extent and what we can steal from the extent being removed.
+ * If this still isn't enough to satisfy the combined
+ * requirements for the two new extents, skim blocks off of each
+ * of the new reservations until they match what is available.
+ */
+ while (nres > ores) {
+ if (len1) {
+ len1--;
+ nres--;
+ }
+ if (nres == ores)
+ break;
+ if (len2) {
+ len2--;
+ nres--;
+ }
+ }
+
+ *indlen1 = len1;
+ *indlen2 = len2;
+
+ return stolen;
+}
+
+/*
* Called by xfs_bmapi to update file extent records and the btree
* after removing space (or undoing a delayed allocation).
*/
@@ -4981,28 +5041,29 @@ xfs_bmap_del_extent(
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
} else {
+ xfs_filblks_t stolen;
ASSERT(whichfork == XFS_DATA_FORK);
- temp = xfs_bmap_worst_indlen(ip, temp);
+
+ /*
+ * Distribute the original indlen reservation across the
+ * two new extents. Steal blocks from the deleted extent
+ * if necessary. Stealing blocks simply fudges the
+ * fdblocks accounting in xfs_bunmapi().
+ */
+ temp = xfs_bmap_worst_indlen(ip, got.br_blockcount);
+ temp2 = xfs_bmap_worst_indlen(ip, new.br_blockcount);
+ stolen = xfs_bmap_split_indlen(da_old, &temp, &temp2,
+ del->br_blockcount);
+ da_new = temp + temp2 - stolen;
+ del->br_blockcount -= stolen;
+
+ /*
+ * Set the reservation for each extent. Warn if either
+ * is zero as this can lead to delalloc problems.
+ */
+ WARN_ON_ONCE(!temp || !temp2);
xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
- temp2 = xfs_bmap_worst_indlen(ip, temp2);
new.br_startblock = nullstartblock((int)temp2);
- da_new = temp + temp2;
- while (da_new > da_old) {
- if (temp) {
- temp--;
- da_new--;
- xfs_bmbt_set_startblock(ep,
- nullstartblock((int)temp));
- }
- if (da_new == da_old)
- break;
- if (temp2) {
- temp2--;
- da_new--;
- new.br_startblock =
- nullstartblock((int)temp2);
- }
- }
}
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_insert(ip, *idx + 1, 1, &new, state);
@@ -5293,31 +5354,7 @@ xfs_bunmapi(
goto nodelete;
}
}
- if (wasdel) {
- ASSERT(startblockval(del.br_startblock) > 0);
- /* Update realtime/data freespace, unreserve quota */
- if (isrt) {
- xfs_filblks_t rtexts;
- rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
- do_div(rtexts, mp->m_sb.sb_rextsize);
- xfs_mod_frextents(mp, (int64_t)rtexts);
- (void)xfs_trans_reserve_quota_nblks(NULL,
- ip, -((long)del.br_blockcount), 0,
- XFS_QMOPT_RES_RTBLKS);
- } else {
- xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount,
- false);
- (void)xfs_trans_reserve_quota_nblks(NULL,
- ip, -((long)del.br_blockcount), 0,
- XFS_QMOPT_RES_REGBLKS);
- }
- ip->i_delayed_blks -= del.br_blockcount;
- if (cur)
- cur->bc_private.b.flags |=
- XFS_BTCUR_BPRV_WASDEL;
- } else if (cur)
- cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
/*
* If it's the case where the directory code is running
* with no block reservation, and the deleted block is in
@@ -5339,11 +5376,45 @@ xfs_bunmapi(
error = -ENOSPC;
goto error0;
}
+
+ /*
+ * Unreserve quota and update realtime free space, if
+ * appropriate. If delayed allocation, update the inode delalloc
+ * counter now and wait to update the sb counters as
+ * xfs_bmap_del_extent() might need to borrow some blocks.
+ */
+ if (wasdel) {
+ ASSERT(startblockval(del.br_startblock) > 0);
+ if (isrt) {
+ xfs_filblks_t rtexts;
+
+ rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
+ do_div(rtexts, mp->m_sb.sb_rextsize);
+ xfs_mod_frextents(mp, (int64_t)rtexts);
+ (void)xfs_trans_reserve_quota_nblks(NULL,
+ ip, -((long)del.br_blockcount), 0,
+ XFS_QMOPT_RES_RTBLKS);
+ } else {
+ (void)xfs_trans_reserve_quota_nblks(NULL,
+ ip, -((long)del.br_blockcount), 0,
+ XFS_QMOPT_RES_REGBLKS);
+ }
+ ip->i_delayed_blks -= del.br_blockcount;
+ if (cur)
+ cur->bc_private.b.flags |=
+ XFS_BTCUR_BPRV_WASDEL;
+ } else if (cur)
+ cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
+
error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
&tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
+
+ if (!isrt && wasdel)
+ xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, false);
+
bno = del.br_startoff - 1;
nodelete:
/*
diff --git a/fs/xfs/libxfs/xfs_dir2_node.c b/fs/xfs/libxfs/xfs_dir2_node.c
index 63ee03db796c..75a557432d0f 100644
--- a/fs/xfs/libxfs/xfs_dir2_node.c
+++ b/fs/xfs/libxfs/xfs_dir2_node.c
@@ -2235,6 +2235,9 @@ xfs_dir2_node_trim_free(
dp = args->dp;
tp = args->trans;
+
+ *rvalp = 0;
+
/*
* Read the freespace block.
*/
@@ -2255,7 +2258,6 @@ xfs_dir2_node_trim_free(
*/
if (freehdr.nused > 0) {
xfs_trans_brelse(tp, bp);
- *rvalp = 0;
return 0;
}
/*
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 75a39a8257ee..7ba680e572fc 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1474,6 +1474,7 @@ xfs_vm_write_failed(
loff_t from = pos & (PAGE_CACHE_SIZE - 1);
loff_t to = from + len;
struct buffer_head *bh, *head;
+ struct xfs_mount *mp = XFS_I(inode)->i_mount;
/*
* The request pos offset might be 32 or 64 bit, this is all fine
@@ -1515,7 +1516,8 @@ xfs_vm_write_failed(
if (!buffer_delay(bh) && !buffer_unwritten(bh))
continue;
- if (!buffer_new(bh) && block_offset < i_size_read(inode))
+ if (!xfs_mp_fail_writes(mp) && !buffer_new(bh) &&
+ block_offset < i_size_read(inode))
continue;
if (buffer_delay(bh))
@@ -1555,6 +1557,7 @@ xfs_vm_write_begin(
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
struct page *page;
int status;
+ struct xfs_mount *mp = XFS_I(mapping->host)->i_mount;
ASSERT(len <= PAGE_CACHE_SIZE);
@@ -1563,6 +1566,8 @@ xfs_vm_write_begin(
return -ENOMEM;
status = __block_write_begin(page, pos, len, xfs_get_blocks);
+ if (xfs_mp_fail_writes(mp))
+ status = -EIO;
if (unlikely(status)) {
struct inode *inode = mapping->host;
size_t isize = i_size_read(inode);
@@ -1575,6 +1580,8 @@ xfs_vm_write_begin(
* allocated in this write, not blocks that were previously
* written successfully.
*/
+ if (xfs_mp_fail_writes(mp))
+ isize = 0;
if (pos + len > isize) {
ssize_t start = max_t(ssize_t, pos, isize);
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 1c8611f6b464..bac6b3435591 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -147,6 +147,17 @@ typedef struct xfs_mount {
* to various other kinds of pain inflicted on the pNFS server.
*/
__uint32_t m_generation;
+
+#ifdef DEBUG
+ /*
+ * DEBUG mode instrumentation to test and/or trigger delayed allocation
+ * block killing in the event of failed writes. When enabled, all
+ * buffered writes are forced to fail. All delalloc blocks in the range
+ * of the write (including pre-existing delalloc blocks!) are tossed as
+ * part of the write failure error handling sequence.
+ */
+ bool m_fail_writes;
+#endif
} xfs_mount_t;
/*
@@ -263,6 +274,20 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
}
+#ifdef DEBUG
+static inline bool
+xfs_mp_fail_writes(struct xfs_mount *mp)
+{
+ return mp->m_fail_writes;
+}
+#else
+static inline bool
+xfs_mp_fail_writes(struct xfs_mount *mp)
+{
+ return 0;
+}
+#endif
+
/*
* Per-ag incore structure, copies of information in agf and agi, to improve the
* performance of allocation group selection.
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 641d625eb334..6ced4f143494 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -18,10 +18,13 @@
#include "xfs.h"
#include "xfs_sysfs.h"
+#include "xfs_format.h"
#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_stats.h"
+#include "xfs_mount.h"
struct xfs_sysfs_attr {
struct attribute attr;
@@ -45,16 +48,6 @@ to_attr(struct attribute *attr)
#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
-/*
- * xfs_mount kobject. This currently has no attributes and thus no need for show
- * and store helpers. The mp kobject serves as the per-mount parent object that
- * is identified by the fsname under sysfs.
- */
-
-struct kobj_type xfs_mp_ktype = {
- .release = xfs_sysfs_release,
-};
-
STATIC ssize_t
xfs_sysfs_object_show(
struct kobject *kobject,
@@ -83,6 +76,71 @@ static const struct sysfs_ops xfs_sysfs_ops = {
.store = xfs_sysfs_object_store,
};
+/*
+ * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
+ * that is identified by the fsname under sysfs.
+ */
+
+static inline struct xfs_mount *
+to_mp(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xfs_mount, m_kobj);
+}
+
+#ifdef DEBUG
+
+STATIC ssize_t
+fail_writes_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val == 1)
+ mp->m_fail_writes = true;
+ else if (val == 0)
+ mp->m_fail_writes = false;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+STATIC ssize_t
+fail_writes_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
+}
+XFS_SYSFS_ATTR_RW(fail_writes);
+
+#endif /* DEBUG */
+
+static struct attribute *xfs_mp_attrs[] = {
+#ifdef DEBUG
+ ATTR_LIST(fail_writes),
+#endif
+ NULL,
+};
+
+struct kobj_type xfs_mp_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_mp_attrs,
+};
+
#ifdef DEBUG
/* debug */
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 748b16aff45a..20c53666cb4b 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1028,6 +1028,8 @@ __xfs_trans_roll(
struct xfs_trans_res tres;
int error;
+ *committed = 0;
+
/*
* Ensure that the inode is always logged.
*/
@@ -1082,6 +1084,6 @@ xfs_trans_roll(
struct xfs_trans **tpp,
struct xfs_inode *dp)
{
- int committed = 0;
+ int committed;
return __xfs_trans_roll(tpp, dp, &committed);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 05:27:18 +0000