From d139d7ffd0c1e81e2a809909b4f8b121a0dc119a Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Thu, 18 Oct 2007 03:07:00 -0700 Subject: VFS: allow filesystems to implement atomic open+truncate 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 Cc: Christoph Hellwig Cc: Al Viro Cc: Andreas Dilger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/namei.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index 464eeccb675..1e5c7166916 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -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) -- cgit v1.2.3