diff --git a/Documentation/admin-guide/xfs.rst b/Documentation/admin-guide/xfs.rst
index 6178153d33200e8ebf5179b3fb8cdea497e74c46..5422407a96d7a3cfe877273d50d9e2b26ee478c9 100644
--- a/Documentation/admin-guide/xfs.rst
+++ b/Documentation/admin-guide/xfs.rst
@@ -284,6 +284,9 @@ The following sysctls are available for the XFS filesystem:
removes unused preallocation from clean inodes and releases
the unused space back to the free pool.
+ fs.xfs.speculative_cow_prealloc_lifetime
+ This is an alias for speculative_prealloc_lifetime.
+
fs.xfs.error_level (Min: 0 Default: 3 Max: 11)
A volume knob for error reporting when internal errors occur.
This will generate detailed messages & backtraces for filesystem
@@ -356,12 +359,13 @@ The following sysctls are available for the XFS filesystem:
Deprecated Sysctls
==================
-=========================== ================
- Name Removal Schedule
-=========================== ================
-fs.xfs.irix_sgid_inherit September 2025
-fs.xfs.irix_symlink_mode September 2025
-=========================== ================
+=========================================== ================
+ Name Removal Schedule
+=========================================== ================
+fs.xfs.irix_sgid_inherit September 2025
+fs.xfs.irix_symlink_mode September 2025
+fs.xfs.speculative_cow_prealloc_lifetime September 2025
+=========================================== ================
Removed Sysctls
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 0d9d1a6a947ed094b56506b876e971c46f98f8fb..7ffcd7ef33d4f500f9f8e0de2a86aca8e1943aeb 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1458,13 +1458,6 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
PF_MEMALLOC))
goto redirty;
- /*
- * Given that we do not allow direct reclaim to call us, we should
- * never be called in a recursive filesystem reclaim context.
- */
- if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS))
- goto redirty;
-
/*
* Is this page beyond the end of the file?
*
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index b56ff451adcee8960b14bf2917a74f2026f5960f..5b6fcb9b44e28b8dec2b51cc2c5373901ba46e1a 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -2805,7 +2805,7 @@ xfs_btree_split_worker(
struct xfs_btree_split_args *args = container_of(work,
struct xfs_btree_split_args, work);
unsigned long pflags;
- unsigned long new_pflags = PF_MEMALLOC_NOFS;
+ unsigned long new_pflags = 0;
/*
* we are in a transaction context here, but may also be doing work
@@ -2817,12 +2817,20 @@ xfs_btree_split_worker(
new_pflags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
current_set_flags_nested(&pflags, new_pflags);
+ xfs_trans_set_context(args->cur->bc_tp);
args->result = __xfs_btree_split(args->cur, args->level, args->ptrp,
args->key, args->curp, args->stat);
- complete(args->done);
+ xfs_trans_clear_context(args->cur->bc_tp);
current_restore_flags_nested(&pflags, new_pflags);
+
+ /*
+ * Do not access args after complete() has run here. We don't own args
+ * and the owner may run and free args before we return here.
+ */
+ complete(args->done);
+
}
/*
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 4304c6416fbbc1e30b77d655bd3678c2815c5df9..b4186d666157e5bed63eac073b2adf140a1260ec 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -62,7 +62,7 @@ xfs_setfilesize_trans_alloc(
* We hand off the transaction to the completion thread now, so
* clear the flag here.
*/
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ xfs_trans_clear_context(tp);
return 0;
}
@@ -125,7 +125,7 @@ xfs_setfilesize_ioend(
* thus we need to mark ourselves as being in a transaction manually.
* Similarly for freeze protection.
*/
- current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ xfs_trans_set_context(tp);
__sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);
/* we abort the update if there was an IO error */
@@ -568,6 +568,12 @@ xfs_vm_writepage(
{
struct xfs_writepage_ctx wpc = { };
+ if (WARN_ON_ONCE(current->journal_info)) {
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ return 0;
+ }
+
return iomap_writepage(page, wbc, &wpc.ctx, &xfs_writeback_ops);
}
@@ -578,6 +584,13 @@ xfs_vm_writepages(
{
struct xfs_writepage_ctx wpc = { };
+ /*
+ * Writing back data in a transaction context can result in recursive
+ * transactions. This is bad, so issue a warning and get out of here.
+ */
+ if (WARN_ON_ONCE(current->journal_info))
+ return 0;
+
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
return iomap_writepages(mapping, wbc, &wpc.ctx, &xfs_writeback_ops);
}
diff --git a/fs/xfs/xfs_extent_busy.c b/fs/xfs/xfs_extent_busy.c
index 3991e59cfd18b7496367be341ac1d03fe0ead60a..ef17c1f6db32242bfbafc5e5f36fbfe661f306fc 100644
--- a/fs/xfs/xfs_extent_busy.c
+++ b/fs/xfs/xfs_extent_busy.c
@@ -344,7 +344,6 @@ xfs_extent_busy_trim(
ASSERT(*len > 0);
spin_lock(&args->pag->pagb_lock);
-restart:
fbno = *bno;
flen = *len;
rbp = args->pag->pagb_tree.rb_node;
@@ -363,19 +362,6 @@ xfs_extent_busy_trim(
continue;
}
- /*
- * If this is a metadata allocation, try to reuse the busy
- * extent instead of trimming the allocation.
- */
- if (!(args->datatype & XFS_ALLOC_USERDATA) &&
- !(busyp->flags & XFS_EXTENT_BUSY_DISCARDED)) {
- if (!xfs_extent_busy_update_extent(args->mp, args->pag,
- busyp, fbno, flen,
- false))
- goto restart;
- continue;
- }
-
if (bbno <= fbno) {
/* start overlap */
diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c
index 145e06c47744815155277cd4a56872297bdfcf58..546a6cd9672924dfed520bc7feb2df47f4dbfabc 100644
--- a/fs/xfs/xfs_sysctl.c
+++ b/fs/xfs/xfs_sysctl.c
@@ -51,7 +51,7 @@ xfs_panic_mask_proc_handler(
#endif /* CONFIG_PROC_FS */
STATIC int
-xfs_deprecate_irix_sgid_inherit_proc_handler(
+xfs_deprecated_dointvec_minmax(
struct ctl_table *ctl,
int write,
void *buffer,
@@ -59,24 +59,8 @@ xfs_deprecate_irix_sgid_inherit_proc_handler(
loff_t *ppos)
{
if (write) {
- printk_once(KERN_WARNING
- "XFS: " "%s sysctl option is deprecated.\n",
- ctl->procname);
- }
- return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
-}
-
-STATIC int
-xfs_deprecate_irix_symlink_mode_proc_handler(
- struct ctl_table *ctl,
- int write,
- void *buffer,
- size_t *lenp,
- loff_t *ppos)
-{
- if (write) {
- printk_once(KERN_WARNING
- "XFS: " "%s sysctl option is deprecated.\n",
+ printk_ratelimited(KERN_WARNING
+ "XFS: %s sysctl option is deprecated.\n",
ctl->procname);
}
return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
@@ -88,7 +72,7 @@ static struct ctl_table xfs_table[] = {
.data = &xfs_params.sgid_inherit.val,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = xfs_deprecate_irix_sgid_inherit_proc_handler,
+ .proc_handler = xfs_deprecated_dointvec_minmax,
.extra1 = &xfs_params.sgid_inherit.min,
.extra2 = &xfs_params.sgid_inherit.max
},
@@ -97,7 +81,7 @@ static struct ctl_table xfs_table[] = {
.data = &xfs_params.symlink_mode.val,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = xfs_deprecate_irix_symlink_mode_proc_handler,
+ .proc_handler = xfs_deprecated_dointvec_minmax,
.extra1 = &xfs_params.symlink_mode.min,
.extra2 = &xfs_params.symlink_mode.max
},
@@ -201,6 +185,15 @@ static struct ctl_table xfs_table[] = {
.extra1 = &xfs_params.blockgc_timer.min,
.extra2 = &xfs_params.blockgc_timer.max,
},
+ {
+ .procname = "speculative_cow_prealloc_lifetime",
+ .data = &xfs_params.blockgc_timer.val,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = xfs_deprecated_dointvec_minmax,
+ .extra1 = &xfs_params.blockgc_timer.min,
+ .extra2 = &xfs_params.blockgc_timer.max,
+ },
/* please keep this the last entry */
#ifdef CONFIG_PROC_FS
{
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 44f72c09c20349833c0bc926da2db11d64386c92..b22a09e9daeefd84ad7bd30e049bcad5884e43b7 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -72,6 +72,7 @@ xfs_trans_free(
xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
trace_xfs_trans_free(tp, _RET_IP_);
+ xfs_trans_clear_context(tp);
if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
sb_end_intwrite(tp->t_mountp->m_super);
xfs_trans_free_dqinfo(tp);
@@ -123,7 +124,8 @@ xfs_trans_dup(
ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
tp->t_rtx_res = tp->t_rtx_res_used;
- ntp->t_pflags = tp->t_pflags;
+
+ xfs_trans_switch_context(tp, ntp);
/* move deferred ops over to the new tp */
xfs_defer_move(ntp, tp);
@@ -157,9 +159,6 @@ xfs_trans_reserve(
int error = 0;
bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
- /* Mark this thread as being in a transaction */
- current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
-
/*
* Attempt to reserve the needed disk blocks by decrementing
* the number needed from the number available. This will
@@ -167,10 +166,8 @@ xfs_trans_reserve(
*/
if (blocks > 0) {
error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
- if (error != 0) {
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ if (error != 0)
return -ENOSPC;
- }
tp->t_blk_res += blocks;
}
@@ -244,9 +241,6 @@ xfs_trans_reserve(
xfs_mod_fdblocks(mp, (int64_t)blocks, rsvd);
tp->t_blk_res = 0;
}
-
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
-
return error;
}
@@ -260,6 +254,7 @@ xfs_trans_alloc(
struct xfs_trans **tpp)
{
struct xfs_trans *tp;
+ bool want_retry = true;
int error;
/*
@@ -267,9 +262,11 @@ xfs_trans_alloc(
* GFP_NOFS allocation context so that we avoid lockdep false positives
* by doing GFP_KERNEL allocations inside sb_start_intwrite().
*/
+retry:
tp = kmem_cache_zalloc(xfs_trans_zone, GFP_KERNEL | __GFP_NOFAIL);
if (!(flags & XFS_TRANS_NO_WRITECOUNT))
sb_start_intwrite(mp->m_super);
+ xfs_trans_set_context(tp);
/*
* Zero-reservation ("empty") transactions can't modify anything, so
@@ -289,7 +286,9 @@ xfs_trans_alloc(
tp->t_firstblock = NULLFSBLOCK;
error = xfs_trans_reserve(tp, resp, blocks, rtextents);
- if (error == -ENOSPC) {
+ if (error == -ENOSPC && want_retry) {
+ xfs_trans_cancel(tp);
+
/*
* We weren't able to reserve enough space for the transaction.
* Flush the other speculative space allocations to free space.
@@ -297,8 +296,11 @@ xfs_trans_alloc(
* other locks.
*/
error = xfs_blockgc_free_space(mp, NULL);
- if (!error)
- error = xfs_trans_reserve(tp, resp, blocks, rtextents);
+ if (error)
+ return error;
+
+ want_retry = false;
+ goto retry;
}
if (error) {
xfs_trans_cancel(tp);
@@ -893,7 +895,6 @@ __xfs_trans_commit(
xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
xfs_trans_free(tp);
/*
@@ -925,7 +926,6 @@ __xfs_trans_commit(
xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
tp->t_ticket = NULL;
}
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
xfs_trans_free_items(tp, !!error);
xfs_trans_free(tp);
@@ -985,9 +985,6 @@ xfs_trans_cancel(
tp->t_ticket = NULL;
}
- /* mark this thread as no longer being in a transaction */
- current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
-
xfs_trans_free_items(tp, dirty);
xfs_trans_free(tp);
}
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 8b03fbfe9a1bda3984951ed068dea827130c81c6..9dd745cf77c9cdd140500c76f16ebecc0ff9b58b 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -281,4 +281,34 @@ int xfs_trans_alloc_ichange(struct xfs_inode *ip, struct xfs_dquot *udqp,
struct xfs_dquot *gdqp, struct xfs_dquot *pdqp, bool force,
struct xfs_trans **tpp);
+static inline void
+xfs_trans_set_context(
+ struct xfs_trans *tp)
+{
+ ASSERT(current->journal_info == NULL);
+ tp->t_pflags = memalloc_nofs_save();
+ current->journal_info = tp;
+}
+
+static inline void
+xfs_trans_clear_context(
+ struct xfs_trans *tp)
+{
+ if (current->journal_info == tp) {
+ memalloc_nofs_restore(tp->t_pflags);
+ current->journal_info = NULL;
+ }
+}
+
+static inline void
+xfs_trans_switch_context(
+ struct xfs_trans *old_tp,
+ struct xfs_trans *new_tp)
+{
+ ASSERT(current->journal_info == old_tp);
+ new_tp->t_pflags = old_tp->t_pflags;
+ old_tp->t_pflags = 0;
+ current->journal_info = new_tp;
+}
+
#endif /* __XFS_TRANS_H__ */