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VFS: allow filesystems to implement atomic open+truncate

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Add a new attribute flag ATTR_OPEN, with the meaning: "truncation was
initiated by open() due to the O_TRUNC flag".

This way filesystems wanting to implement truncation within their ->open()
method can ignore such truncate requests.

This is a quick & dirty hack, but it comes for free.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi
2007-10-18 03:07:00 -07:00
committed by Linus Torvalds
parent 49d4914fd7
commit d139d7ffd0
2 changed files with 5 additions and 2 deletions
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6
fs/namei.c
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@ -1659,8 +1659,10 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
error = locks_verify_locked(inode);
if (!error) {
DQUOT_INIT(inode);
error = do_truncate(dentry, 0, ATTR_MTIME|ATTR_CTIME, NULL);
error = do_truncate(dentry, 0,
ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
NULL);
}
put_write_access(inode);
if (error)