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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-14 19:47:25 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-14 19:47:25 +0300 |
| commit | 9d645db853a4cd1b7077931491d0055602d3d420 (patch) | |
| tree | 07278a516561c15bac191b221f5fb27353083f8c /fs/btrfs/btrfs_inode.h | |
| parent | 96144c58abe7ff767e754b5b80995f7b8846d49b (diff) | |
| parent | 55e20bd12a56e06c38b953177bb162cbbaa96004 (diff) | |
| download | linux-9d645db853a4cd1b7077931491d0055602d3d420.tar.xz | |
Merge tag 'for-5.8-part2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"This reverts the direct io port to iomap infrastructure of btrfs
merged in the first pull request. We found problems in invalidate page
that don't seem to be fixable as regressions or without changing iomap
code that would not affect other filesystems.
There are four reverts in total, but three of them are followup
cleanups needed to revert a43a67a2d715 cleanly. The result is the
buffer head based implementation of direct io.
Reverts are not great, but under current circumstances I don't see
better options"
* tag 'for-5.8-part2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
Revert "btrfs: switch to iomap_dio_rw() for dio"
Revert "fs: remove dio_end_io()"
Revert "btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK"
Revert "btrfs: split btrfs_direct_IO to read and write part"
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
| -rw-r--r-- | fs/btrfs/btrfs_inode.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index aeff56a0e105..e7d709505cb1 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -28,6 +28,7 @@ enum { BTRFS_INODE_NEEDS_FULL_SYNC, BTRFS_INODE_COPY_EVERYTHING, BTRFS_INODE_IN_DELALLOC_LIST, + BTRFS_INODE_READDIO_NEED_LOCK, BTRFS_INODE_HAS_PROPS, BTRFS_INODE_SNAPSHOT_FLUSH, }; @@ -312,6 +313,23 @@ struct btrfs_dio_private { u8 csums[]; }; +/* + * Disable DIO read nolock optimization, so new dio readers will be forced + * to grab i_mutex. It is used to avoid the endless truncate due to + * nonlocked dio read. + */ +static inline void btrfs_inode_block_unlocked_dio(struct btrfs_inode *inode) +{ + set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags); + smp_mb(); +} + +static inline void btrfs_inode_resume_unlocked_dio(struct btrfs_inode *inode) +{ + smp_mb__before_atomic(); + clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags); +} + /* Array of bytes with variable length, hexadecimal format 0x1234 */ #define CSUM_FMT "0x%*phN" #define CSUM_FMT_VALUE(size, bytes) size, bytes |