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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2019-12-04 05:58:53 -0600
committerDavid Sterba <dsterba@suse.com>2020-05-28 14:01:52 +0200
commit5f008163a559d566a0ee1190a0a24f3eec6f1ea7 (patch)
tree3abd629b4cffb4de245510594da552116656f172
parentb75b7ca7c27dfd61dba368f390b7d4dc20b3a8cb (diff)
downloadlinux-5f008163a559d566a0ee1190a0a24f3eec6f1ea7.tar.bz2
btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK
Since we now perform direct reads using i_rwsem, we can remove this inode flag used to co-ordinate unlocked reads. The truncate call takes i_rwsem. This means it is correctly synchronized with concurrent direct reads. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Johannes Thumshirn <jth@kernel.org> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--fs/btrfs/btrfs_inode.h18
-rw-r--r--fs/btrfs/inode.c3
2 files changed, 0 insertions, 21 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index e7d709505cb1..aeff56a0e105 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -28,7 +28,6 @@ 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,
};
@@ -313,23 +312,6 @@ 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
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 501842f8c648..0c47f79da2e1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4750,10 +4750,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
truncate_setsize(inode, newsize);
- /* Disable nonlocked read DIO to avoid the endless truncate */
- btrfs_inode_block_unlocked_dio(BTRFS_I(inode));
inode_dio_wait(inode);
- btrfs_inode_resume_unlocked_dio(BTRFS_I(inode));
ret = btrfs_truncate(inode, newsize == oldsize);
if (ret && inode->i_nlink) {