Miklos Szeredi 0a7c3937a1 vfs: add RENAME_NOREPLACE flag ... If this flag is specified and the target of the rename exists then the rename syscall fails with EEXIST. The VFS does the existence checking, so it is trivial to enable for most local filesystems. This patch only enables it in ext4. For network filesystems the VFS check is not enough as there may be a race between a remote create and the rename, so these filesystems need to handle this flag in their ->rename() implementations to ensure atomicity. Andy writes about why this is useful: "The trivial answer: to eliminate the race condition from 'mv -i'. Another answer: there's a common pattern to atomically create a file with contents: open a temporary file, write to it, optionally fsync it, close it, then link(2) it to the final name, then unlink the temporary file. The reason to use link(2) is because it won't silently clobber the destination. This is annoying: - It requires an extra system call that shouldn't be necessary. - It doesn't work on (IMO sensible) filesystems that don't support hard links (e.g. vfat). - It's not atomic -- there's an intermediate state where both files exist. - It's ugly. The new rename flag will make this totally sensible. To be fair, on new enough kernels, you can also use O_TMPFILE and linkat to achieve the same thing even more cleanly." Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: J. Bruce Fields <bfields@redhat.com>		2014-04-01 17:08:43 +02:00
..
9p	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
adfs
affs	affs: use ->kill_sb() to simplify ->put_super() and failure exits of ->mount()	2014-01-25 03:13:01 -05:00
afs	afs: proc cells and rootcell are writeable	2014-02-01 10:59:39 -08:00
autofs4	autofs: fix symlinks aren't checked for expiry	2014-01-23 16:36:59 -08:00
befs	befs: iget_locked() doesn't return an ERR_PTR	2014-01-25 03:14:38 -05:00
bfs
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2014-02-16 11:05:27 -08:00
cachefiles	vfs: add renameat2 syscall	2014-04-01 17:08:42 +02:00
ceph	ceph: fix __dcache_readdir()	2014-02-17 12:37:13 -08:00
cifs	cifs: mask off top byte in get_rfc1002_length()	2014-02-28 14:01:14 -06:00
coda
configfs
cramfs	cramfs: take headers to fs/cramfs	2014-01-25 03:13:02 -05:00
debugfs
devpts
dlm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-01-25 11:17:34 -08:00
ecryptfs	vfs: add renameat2 syscall	2014-04-01 17:08:42 +02:00
efivarfs
efs	efs: get rid of ->put_super()	2014-01-25 03:13:02 -05:00
exofs	exofs: Print less in r4w	2014-01-23 18:54:14 +02:00
exportfs
ext2	ext2/3/4: use generic posix ACL infrastructure	2014-01-25 23:58:19 -05:00
ext3	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
ext4	vfs: add RENAME_NOREPLACE flag	2014-04-01 17:08:43 +02:00
f2fs	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
fat
freevxfs
fscache	FS-Cache: Handle removal of unadded object to the fscache_object_list rb tree	2014-02-17 13:47:35 -08:00
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
gfs2	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
hfs
hfsplus	hfsplus: add HFSX subfolder count support	2014-03-10 17:26:21 -07:00
hostfs	um: hostfs: make functions static	2014-01-26 11:51:09 +01:00
hpfs	hpfs: optimize quad buffer loading	2014-02-02 16:24:07 -08:00
hppfs
hugetlbfs
isofs
jbd
jbd2	jbd2: fix use after free in jbd2_journal_start_reserved()	2014-02-17 20:33:01 -05:00
jffs2	MTD updates for 3.14:	2014-01-28 18:56:37 -08:00
jfs	jfs: set i_ctime when setting ACL	2014-02-13 15:56:05 -06:00
kernfs	sysfs: fix namespace refcnt leak	2014-02-25 07:37:52 -08:00
lockd	lockd: send correct lock when granting a delayed lock.	2014-02-13 14:55:02 -05:00
logfs	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
minix
ncpfs
nfs	NFS client bugfixes for Linux 3.14	2014-03-09 19:17:39 -07:00
nfs_common
nfsd	vfs: add renameat2 syscall	2014-04-01 17:08:42 +02:00
nilfs2	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
nls	nls: have register_nls() set ->owner	2014-01-25 03:14:05 -05:00
notify	fsnotify: Allocate overflow events with proper type	2014-02-25 11:18:06 +01:00
ntfs	fix O_SYNC|O_APPEND syncing the wrong range on write()	2014-02-09 15:18:09 -05:00
ocfs2	ocfs2: check if cluster name exists before deref	2014-03-28 13:56:58 -07:00
omfs
openpromfs
proc	fs/proc/base.c: fix GPF in /proc/$PID/map_files	2014-03-10 17:26:20 -07:00
pstore
qnx4	qnx4: clean qnx4_fill_super() up	2014-01-25 03:13:03 -05:00
qnx6
quota	quota: Fix race between dqput() and dquot_scan_active()	2014-02-20 21:57:04 +01:00
ramfs	fs/ramfs: move ramfs_aops to inode.c	2014-01-23 16:36:58 -08:00
reiserfs	reiserfs: fix utterly brain-damaged indentation.	2014-02-17 13:46:33 -08:00
romfs	romfs: fix returm err while getting inode in fill_super	2014-01-23 16:37:04 -08:00
squashfs
sysfs	sysfs: fix namespace refcnt leak	2014-02-25 07:37:52 -08:00
sysv
ubifs	fs/ubifs: use rbtree postorder iteration helper instead of opencoding	2014-01-23 16:37:03 -08:00
udf	udf: Fix data corruption on file type conversion	2014-02-20 21:56:00 +01:00
ufs
xfs	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2014-02-27 10:37:22 -08:00
aio.c
anon_inodes.c	vfs: Allocate anon_inode_inode in anon_inode_init()	2014-03-27 09:52:54 -07:00
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c	fs: binfmt_elf: remove unused defines INTERPRETER_NONE and INTERPRETER_ELF	2014-01-23 16:36:58 -08:00
binfmt_elf_fdpic.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c	bio-integrity: Drop bio_integrity_verify BUG_ON in post bip->bip_iter world	2014-02-21 15:56:36 -08:00
bio.c	block: Fix cloning of discard/write same bios	2014-02-11 08:40:45 -07:00
block_dev.c
buffer.c	mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq	2014-02-06 13:48:51 -08:00
char_dev.c
compat.c
compat_binfmt_elf.c
compat_ioctl.c	fs/compat_ioctl.c: fix an underflow issue (harmless)	2014-01-21 16:19:42 -08:00
coredump.c	coredump: make __get_dumpable/get_dumpable inline, kill fs/coredump.h	2014-01-23 16:37:01 -08:00
dcache.c	make prepend_name() work correctly when called with negative *buflen	2014-03-23 00:28:40 -04:00
dcookies.c	fs/compat: fix lookup_dcookie() parameter handling	2014-01-29 16:22:40 -08:00
direct-io.c
drop_caches.c
eventfd.c	eventfd_ctx_fdget(): use fdget() instead of fget()	2014-01-25 03:13:04 -05:00
eventpoll.c
exec.c	execve: use 'struct filename *' for executable name passing	2014-02-05 12:54:53 -08:00
fcntl.c
fhandle.c
file.c	vfs: Don't let __fdget_pos() get FMODE_PATH files	2014-03-23 00:03:12 -04:00
file_table.c	vfs: atomic f_pos accesses as per POSIX	2014-03-10 11:44:41 -04:00
filesystems.c
fs-writeback.c	Revert "writeback: do not sync data dirtied after sync start"	2014-02-22 02:02:28 +01:00
fs_struct.c
inode.c
internal.h
ioctl.c
ioprio.c
Kconfig	fs: remove generic_acl	2014-01-26 08:26:40 -05:00
Kconfig.binfmt
libfs.c
locks.c
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
mbcache.c
mount.h	switch mnt_hash to hlist	2014-03-30 19:18:51 -04:00
mpage.c
namei.c	vfs: add RENAME_NOREPLACE flag	2014-04-01 17:08:43 +02:00
namespace.c	switch mnt_hash to hlist	2014-03-30 19:18:51 -04:00
no-block.c
open.c	vfs: atomic f_pos accesses as per POSIX	2014-03-10 11:44:41 -04:00
pipe.c	fs/pipe.c: skip file_update_time on frozen fs	2014-01-23 16:37:00 -08:00
pnode.c	switch mnt_hash to hlist	2014-03-30 19:18:51 -04:00
pnode.h	switch mnt_hash to hlist	2014-03-30 19:18:51 -04:00
posix_acl.c	fs: get_acl() must be allowed to return EOPNOTSUPP	2014-02-03 17:12:37 -05:00
proc_namespace.c	fs/proc_namespace.c: simplify testing nsp and nsp->mnt_ns	2014-01-23 16:37:02 -08:00
read_write.c	vfs: atomic f_pos access in llseek()	2014-03-23 00:03:12 -04:00
readdir.c
select.c
seq_file.c
signalfd.c
splice.c	fuse: fix pipe_buf_operations	2014-01-22 19:36:57 +01:00
stack.c
stat.c
statfs.c
super.c	fs/super.c: sync ro remount after blocking writers	2014-01-31 14:29:36 -05:00
sync.c	Revert "writeback: do not sync data dirtied after sync start"	2014-02-22 02:02:28 +01:00
timerfd.c
utimes.c
xattr.c