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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2012-09-29 06:56:15 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-09-29 06:56:15 +0200 |
| commit | 1b65007e9870e0021397b548e8cd6bbc584f9152 (patch) | |
| tree | 17cd144e9215ac7db9084f385c9c0d50e82b0bf6 /fs/ext4 | |
| parent | ext4: serialize unlocked dio reads with truncate (diff) | |
| download | linux-1b65007e9870e0021397b548e8cd6bbc584f9152.tar.xz linux-1b65007e9870e0021397b548e8cd6bbc584f9152.zip | |
ext4: endless truncate due to nonlocked dio readers
If we have enough aggressive DIO readers, truncate and other dio
waiters will wait forever inside inode_dio_wait(). It is reasonable
to disable nonlock DIO read optimization during truncate.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/inode.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 0bfc63331467..05ab70dd5c64 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4333,9 +4333,14 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) if (attr->ia_valid & ATTR_SIZE) { if (attr->ia_size != i_size_read(inode)) { truncate_setsize(inode, attr->ia_size); - /* Inode size will be reduced, wait for dio in flight */ - if (orphan) + /* Inode size will be reduced, wait for dio in flight. + * Temporarily disable dioread_nolock to prevent + * livelock. */ + if (orphan) { + ext4_inode_block_unlocked_dio(inode); inode_dio_wait(inode); + ext4_inode_resume_unlocked_dio(inode); + } } ext4_truncate(inode); } |