The patch titled
VFS: allow filesystems to implement atomic open+truncate
has been removed from the -mm tree. Its filename was
vfs-allow-filesystems-to-implement-atomic-opentruncate.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: VFS: allow filesystems to implement atomic open+truncate
From: Miklos Szeredi <mszeredi@xxxxxxx>
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@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andreas Dilger <adilger@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/namei.c | 6 ++++--
include/linux/fs.h | 1 +
2 files changed, 5 insertions(+), 2 deletions(-)
diff -puN fs/namei.c~vfs-allow-filesystems-to-implement-atomic-opentruncate fs/namei.c
--- a/fs/namei.c~vfs-allow-filesystems-to-implement-atomic-opentruncate
+++ a/fs/namei.c
@@ -1659,8 +1659,10 @@ int may_open(struct nameidata *nd, int a
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 -puN include/linux/fs.h~vfs-allow-filesystems-to-implement-atomic-opentruncate include/linux/fs.h
--- a/include/linux/fs.h~vfs-allow-filesystems-to-implement-atomic-opentruncate
+++ a/include/linux/fs.h
@@ -330,6 +330,7 @@ typedef void (dio_iodone_t)(struct kiocb
#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
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
origin.patch
unprivileged-mounts-add-user-mounts-to-the-kernel.patch
unprivileged-mounts-allow-unprivileged-umount.patch
unprivileged-mounts-account-user-mounts.patch
unprivileged-mounts-propagate-error-values-from-clone_mnt.patch
unprivileged-mounts-allow-unprivileged-bind-mounts.patch
unprivileged-mounts-put-declaration-of-put_filesystem-in-fsh.patch
unprivileged-mounts-allow-unprivileged-mounts.patch
unprivileged-mounts-allow-unprivileged-mounts-fix-subtype-handling.patch
unprivileged-mounts-allow-unprivileged-fuse-mounts.patch
unprivileged-mounts-propagation-inherit-owner-from-parent.patch
unprivileged-mounts-propagation-inherit-owner-from-parent-fix-for-git-audit.patch
unprivileged-mounts-add-no-submounts-flag.patch
r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create-fix.patch
slab-api-remove-useless-ctor-parameter-and-reorder-parameters-vs-revoke.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke-fix.patch
-
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