The patch titled
Subject: xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS
has been added to the -mm tree. Its filename is
xfs-abstract-pf_fstrans-to-pf_memalloc_nofs.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/xfs-abstract-pf_fstrans-to-pf_memalloc_nofs.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/xfs-abstract-pf_fstrans-to-pf_memalloc_nofs.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS
xfs has defined PF_FSTRANS to declare a scope GFP_NOFS semantic quite some
time ago. We would like to make this concept more generic and use it for
other filesystems as well. Let's start by giving the flag a more generic
name PF_MEMALLOC_NOFS which is in line with an exiting PF_MEMALLOC_NOIO
already used for the same purpose for GFP_NOIO contexts. Replace all
PF_FSTRANS usage from the xfs code in the first step before we introduce a
full API for it as xfs uses the flag directly anyway.
This patch doesn't introduce any functional change.
Link: http://lkml.kernel.org/r/20170306131408.9828-4-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: David Sterba <dsterba@xxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Nikolay Borisov <nborisov@xxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/xfs/kmem.c | 4 ++--
fs/xfs/kmem.h | 2 +-
fs/xfs/libxfs/xfs_btree.c | 2 +-
fs/xfs/xfs_aops.c | 6 +++---
fs/xfs/xfs_trans.c | 12 ++++++------
include/linux/sched.h | 2 ++
6 files changed, 15 insertions(+), 13 deletions(-)
diff -puN fs/xfs/kmem.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs fs/xfs/kmem.c
--- a/fs/xfs/kmem.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/fs/xfs/kmem.c
@@ -81,13 +81,13 @@ kmem_zalloc_large(size_t size, xfs_km_fl
* context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
* the filesystem here and potentially deadlocking.
*/
- if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
+ if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS))
noio_flag = memalloc_noio_save();
lflags = kmem_flags_convert(flags);
ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
- if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
+ if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS))
memalloc_noio_restore(noio_flag);
return ptr;
diff -puN fs/xfs/kmem.h~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs fs/xfs/kmem.h
--- a/fs/xfs/kmem.h~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/fs/xfs/kmem.h
@@ -50,7 +50,7 @@ kmem_flags_convert(xfs_km_flags_t flags)
lflags = GFP_ATOMIC | __GFP_NOWARN;
} else {
lflags = GFP_KERNEL | __GFP_NOWARN;
- if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
+ if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS))
lflags &= ~__GFP_FS;
}
diff -puN fs/xfs/libxfs/xfs_btree.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs fs/xfs/libxfs/xfs_btree.c
--- a/fs/xfs/libxfs/xfs_btree.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/fs/xfs/libxfs/xfs_btree.c
@@ -2886,7 +2886,7 @@ 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_FSTRANS;
+ unsigned long new_pflags = PF_MEMALLOC_NOFS;
/*
* we are in a transaction context here, but may also be doing work
diff -puN fs/xfs/xfs_aops.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs fs/xfs/xfs_aops.c
--- a/fs/xfs/xfs_aops.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/fs/xfs/xfs_aops.c
@@ -189,7 +189,7 @@ 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_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
return 0;
}
@@ -252,7 +252,7 @@ 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_FSTRANS);
+ current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
__sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);
/* we abort the update if there was an IO error */
@@ -1021,7 +1021,7 @@ xfs_do_writepage(
* Given that we do not allow direct reclaim to call us, we should
* never be called while in a filesystem transaction.
*/
- if (WARN_ON_ONCE(current->flags & PF_FSTRANS))
+ if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS))
goto redirty;
/*
diff -puN fs/xfs/xfs_trans.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs fs/xfs/xfs_trans.c
--- a/fs/xfs/xfs_trans.c~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/fs/xfs/xfs_trans.c
@@ -134,7 +134,7 @@ xfs_trans_reserve(
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_FSTRANS);
+ current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
/*
* Attempt to reserve the needed disk blocks by decrementing
@@ -144,7 +144,7 @@ xfs_trans_reserve(
if (blocks > 0) {
error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
if (error != 0) {
- current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
return -ENOSPC;
}
tp->t_blk_res += blocks;
@@ -221,7 +221,7 @@ undo_blocks:
tp->t_blk_res = 0;
}
- current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
return error;
}
@@ -914,7 +914,7 @@ __xfs_trans_commit(
xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
- current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
xfs_trans_free(tp);
/*
@@ -944,7 +944,7 @@ out_unreserve:
if (commit_lsn == -1 && !error)
error = -EIO;
}
- current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
xfs_trans_free(tp);
@@ -998,7 +998,7 @@ xfs_trans_cancel(
xfs_log_done(mp, tp->t_ticket, NULL, false);
/* mark this thread as no longer being in a transaction */
- current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
xfs_trans_free(tp);
diff -puN include/linux/sched.h~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs include/linux/sched.h
--- a/include/linux/sched.h~xfs-abstract-pf_fstrans-to-pf_memalloc_nofs
+++ a/include/linux/sched.h
@@ -1224,6 +1224,8 @@ extern struct pid *cad_pid;
#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
#define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
+#define PF_MEMALLOC_NOFS PF_FSTRANS /* Transition to a more generic GFP_NOFS scope semantic */
+
/*
* Only the _current_ task can read/write to tsk->flags, but other
* tasks can access tsk->flags in readonly mode for example
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
lockdep-allow-to-disable-reclaim-lockup-detection.patch
xfs-abstract-pf_fstrans-to-pf_memalloc_nofs.patch
mm-introduce-memalloc_nofs_saverestore-api.patch
xfs-use-memalloc_nofs_saverestore-instead-of-memalloc_noio.patch
jbd2-mark-the-transaction-context-with-the-scope-gfp_nofs-context.patch
jbd2-make-the-whole-kjournald2-kthread-nofs-safe.patch
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