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More new code for 5.12:

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- Restore a disused sysctl control knob that was inadvertently dropped
   during the merge window to avoid fstests regressions.
 - Don't speculatively release freed blocks from the busy list until
   we're actually allocating them, which fixes a rare log recovery
   regression.
 - Don't nest transactions when scanning for free space.
 - Add an idiot^Wmaintainer light to detect nested transactions. ;)
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Merge tag 'xfs-5.12-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull more xfs updates from Darrick Wong:
 "The most notable fix here prevents premature reuse of freed metadata
  blocks, and adding the ability to detect accidental nested
  transactions, which are not allowed here.

   - Restore a disused sysctl control knob that was inadvertently
     dropped during the merge window to avoid fstests regressions.

   - Don't speculatively release freed blocks from the busy list until
     we're actually allocating them, which fixes a rare log recovery
     regression.

   - Don't nest transactions when scanning for free space.

   - Add an idiot^Wmaintainer light to detect nested transactions. ;)"

* tag 'xfs-5.12-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: use current->journal_info for detecting transaction recursion
  xfs: don't nest transactions when scanning for eofblocks
  xfs: don't reuse busy extents on extent trim
  xfs: restore speculative_cow_prealloc_lifetime sysctl
This commit is contained in:
Linus Torvalds 2021-02-28 11:45:25 -08:00
commit 03dc748bf1
8 changed files with 94 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Documentation/admin-guide/xfs.rst
View File

@ -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

7
fs/iomap/buffered-io.c
View File

@ -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?
*

12
fs/xfs/libxfs/xfs_btree.c
View File

@ -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);
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);
current_restore_flags_nested(&pflags, new_pflags);
}
/*

17
fs/xfs/xfs_aops.c
View File

@ -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);
}

14
fs/xfs/xfs_extent_busy.c
View File

@ -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 @@ restart:
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 */

35
fs/xfs/xfs_sysctl.c
View File

@ -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
{

33
fs/xfs/xfs_trans.c
View File

@ -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 @@ undo_blocks:
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 @@ out_unreserve:
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);
}

30
fs/xfs/xfs_trans.h
View File

@ -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__ */