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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

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Pull fuse bugfix from Miklos Szeredi:
 "This fixes a race between fallocate() and truncate()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: hold i_mutex in fuse_file_fallocate()
This commit is contained in:
Linus Torvalds 2013-06-25 09:06:04 -10:00
commit 5dbc746960
1 changed files with 8 additions and 4 deletions
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8
fs/fuse/file.c
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@ -2470,12 +2470,15 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
.mode = mode .mode = mode
}; };
int err; int err;
bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
(mode & FALLOC_FL_PUNCH_HOLE);
if (fc->no_fallocate) if (fc->no_fallocate)
return -EOPNOTSUPP; return -EOPNOTSUPP;
if (mode & FALLOC_FL_PUNCH_HOLE) { if (lock_inode) {
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
if (mode & FALLOC_FL_PUNCH_HOLE)
fuse_set_nowrite(inode); fuse_set_nowrite(inode);
} }
@ -2511,7 +2514,8 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
fuse_invalidate_attr(inode); fuse_invalidate_attr(inode);
out: out:
if (mode & FALLOC_FL_PUNCH_HOLE) { if (lock_inode) {
if (mode & FALLOC_FL_PUNCH_HOLE)
fuse_release_nowrite(inode); fuse_release_nowrite(inode);
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
} }