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cifs: call cifs_update_eof with i_lock held

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cifs_update_eof has the potential to be racy if multiple threads are
trying to modify it at the same time. Protect modifications of the
server_eof value with the inode->i_lock.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton
2012-03-23 14:40:56 -04:00
parent e9492871fb
commit 597b027f69
3 changed files with 11 additions and 2 deletions
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9
fs/cifs/file.c
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@@ -1399,7 +1399,10 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
return rc;
}
/* update the file size (if needed) after a write */
/*
* update the file size (if needed) after a write. Should be called with
* the inode->i_lock held
*/
void
cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
unsigned int bytes_written)
@@ -1471,7 +1474,9 @@ static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid,
return rc;
}
} else {
spin_lock(&dentry->d_inode->i_lock);
cifs_update_eof(cifsi, *poffset, bytes_written);
spin_unlock(&dentry->d_inode->i_lock);
*poffset += bytes_written;
}
}
@@ -2197,7 +2202,9 @@ cifs_iovec_write(struct file *file, const struct iovec *iov,
if (written) {
len -= written;
total_written += written;
spin_lock(&inode->i_lock);
cifs_update_eof(CIFS_I(inode), *poffset, written);
spin_unlock(&inode->i_lock);
*poffset += written;
} else if (rc < 0) {
if (!total_written)