Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d139d7ffd0c1e81e2a809909b4f8b121a0dc119a
Commit:     d139d7ffd0c1e81e2a809909b4f8b121a0dc119a
Parent:     49d4914fd7c10ae846d0f30d5f6f4732cc68499c
Author:     Miklos Szeredi <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 03:07:00 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Oct 18 14:37:30 2007 -0700

    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 <[EMAIL PROTECTED]>
    Cc: Christoph Hellwig <[EMAIL PROTECTED]>
    Cc: Al Viro <[EMAIL PROTECTED]>
    Cc: Andreas Dilger <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 fs/namei.c         |    6 ++++--
 include/linux/fs.h |    1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 464eecc..1e5c716 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)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e3fc5db..6a4d170 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -330,6 +330,7 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t 
offset,
 #define ATTR_KILL_SGID 4096
 #define ATTR_FILE      8192
 #define ATTR_KILL_PRIV 16384
+#define ATTR_OPEN      32768   /* Truncating from open(O_TRUNC) */
 
 /*
  * This is the Inode Attributes structure, used for notify_change().  It
-
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