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Filename Latest commit message Latest commit date
Coly Li 013bbbc3e9 romfs: use different way to generate fsid for BLOCK or MTD 
[ Upstream commit f598f82e204ec0b17797caaf1b0311c52d43fb9a ]

Commit 8a59f5d252 ("fs/romfs: return f_fsid for statfs(2)") generates
a 64bit id from sb->s_bdev->bd_dev.  This is only correct when romfs is
defined with CONFIG_ROMFS_ON_BLOCK.  If romfs is only defined with
CONFIG_ROMFS_ON_MTD, sb->s_bdev is NULL, referencing sb->s_bdev->bd_dev
will triger an oops.

Richard Weinberger points out that when CONFIG_ROMFS_BACKED_BY_BOTH=y,
both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD are defined.
Therefore when calling huge_encode_dev() to generate a 64bit id, I use
the follow order to choose parameter,

- CONFIG_ROMFS_ON_BLOCK defined
  use sb->s_bdev->bd_dev
- CONFIG_ROMFS_ON_BLOCK undefined and CONFIG_ROMFS_ON_MTD defined
  use sb->s_dev when,
- both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD undefined
  leave id as 0

When CONFIG_ROMFS_ON_MTD is defined and sb->s_mtd is not NULL, sb->s_dev
is set to a device ID generated by MTD_BLOCK_MAJOR and mtd index,
otherwise sb->s_dev is 0.

This is a try-best effort to generate a uniq file system ID, if all the
above conditions are not meet, f_fsid of this romfs instance will be 0.
Generally only one romfs can be built on single MTD block device, this
method is enough to identify multiple romfs instances in a computer.

Link: http://lkml.kernel.org/r/1482928596-115155-1-git-send-email-colyli@suse.de
Signed-off-by: Coly Li <colyli@suse.de>
Reported-by: Nong Li <nongli1031@gmail.com>
Tested-by: Nong Li <nongli1031@gmail.com>
Cc: Richard Weinberger <richard.weinberger@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-06-17 06:41:56 +02:00
..
9p 9p: fix a potential acl leak 2017-05-14 14:00:13 +02:00
adfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
affs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
afs fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
autofs4 fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
befs befs fixes for 4.9-rc1 2016-10-15 12:09:13 -07:00
bfs Merge remote-tracking branch 'ovl/rename2' into for-linus 2016-10-10 23:02:51 -04:00
btrfs btrfs: fix memory leak in update_space_info failure path 2017-06-14 15:06:02 +02:00
cachefiles Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
ceph fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
cifs CIFS: add misssing SFM mapping for doublequote 2017-05-20 14:28:40 +02:00
coda Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
configfs Merge remote-tracking branch 'ovl/rename2' into for-linus 2016-10-10 23:02:51 -04:00
cramfs
crypto fscrypt: avoid collisions when presenting long encrypted filenames 2017-05-25 15:44:38 +02:00
debugfs fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
devpts Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
dlm dlm: free workqueues after the connections 2016-10-10 09:54:00 -05:00
ecryptfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
efivarfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
efs
exofs fs: exofs: print a hex number after a 0x prefix 2016-10-27 18:43:43 -07:00
exportfs exportfs: be careful to only return expected errors. 2016-10-06 09:07:44 -04:00
ext2 ext2: avoid bogus -Wmaybe-uninitialized warning 2016-10-18 11:29:35 +02:00
ext4 fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
f2fs fscrypt: avoid collisions when presenting long encrypted filenames 2017-05-25 15:44:38 +02:00
fat fat: fix using uninitialized fields of fat_inode/fsinfo_inode 2017-03-15 10:02:52 +08:00
freevxfs
fscache FS-Cache: Initialise stores_lock in netfs cookie 2017-06-17 06:41:52 +02:00
fuse fuse: add missing FR_FORCE 2017-03-12 06:41:47 +01:00
gfs2 gfs2: Use rhashtable walk interface in glock_hash_walk 2017-06-17 06:41:50 +02:00
hfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
hfsplus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
hostfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
hpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
hugetlbfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
isofs isofs: add KERN_CONT to printing of ER records 2016-11-30 10:41:26 -08:00
jbd2 jbd2: don't leak memory if setting up journal fails 2017-03-30 09:41:27 +02:00
jffs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
jfs fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
kernfs kernfs: Add noop_fsync to supported kernfs_file_fops 2016-10-27 17:47:11 +02:00
lockd treewide: remove redundant #include <linux/kconfig.h> 2016-10-11 15:06:33 -07:00
logfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
minix Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
ncpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
nfs nfs: Fix "Don't increment lock sequence ID after NFS4ERR_MOVED" 2017-06-17 06:41:55 +02:00
nfs_common
nfsd fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
nilfs2 fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
nls
notify fanotify: don't expose EOPENSTALE to userspace 2017-05-25 15:44:31 +02:00
ntfs fs: remove the never implemented aio_fsync file operation 2016-10-30 13:09:42 -04:00
ocfs2 fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
omfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
openpromfs fs: Replace CURRENT_TIME with current_time() for inode timestamps 2016-09-27 21:06:21 -04:00
orangefs fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
overlayfs ovl: fix d_real() for stacked fs 2016-11-29 10:20:24 +01:00
proc proc: Fix unbalanced hard link numbers 2017-05-25 15:44:37 +02:00
pstore pstore: Shut down worker when unregistering 2017-05-20 14:28:42 +02:00
qnx4
qnx6
quota quota: fill in Q_XGETQSTAT inode information for inactive quotas 2016-08-15 17:43:31 +02:00
ramfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
reiserfs fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
romfs romfs: use different way to generate fsid for BLOCK or MTD 2017-06-17 06:41:56 +02:00
squashfs vfs: Remove {get,set,remove}xattr inode operations 2016-10-07 21:48:36 -04:00
sysfs sysfs: be careful of error returns from ops->show() 2017-04-12 12:41:11 +02:00
sysv Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
tracefs fs: Replace CURRENT_TIME with current_time() for inode timestamps 2016-09-27 21:06:21 -04:00
ubifs ubifs: Fix O_TMPFILE corner case in ubifs_link() 2017-04-27 09:10:38 +02:00
udf fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
ufs ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path 2017-06-14 15:06:01 +02:00
xfs fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
aio.c aio: fix freeze protection of aio writes 2016-10-30 13:09:42 -04:00
anon_inodes.c
attr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
bad_inode.c bad_inode: add missing i_op initializers 2017-01-09 08:32:24 +01:00
binfmt_aout.c
binfmt_elf.c x86/coredump: Use pr_reg size, rather that TIF_IA32 flag 2016-09-14 21:28:10 +02:00
binfmt_elf_fdpic.c elf_fdpic_transfer_args_to_stack(): make it generic 2016-07-25 16:51:49 +10:00
binfmt_em86.c fs/binfmt_em86.c: fix incompatible pointer type 2016-08-02 19:35:15 -04:00
binfmt_flat.c binfmt_flat: allow compressed flat binary format to work on MMU systems 2016-07-28 13:29:12 +10:00
binfmt_misc.c fs: Replace current_fs_time() with current_time() 2016-09-27 21:06:22 -04:00
binfmt_script.c
block_dev.c fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
buffer.c fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
char_dev.c dax: define a unified inode/address_space for device-dax mappings 2016-08-23 22:58:51 -07:00
compat.c compat: remove compat_printk() 2016-09-27 21:20:53 -04:00
compat_binfmt_elf.c
compat_ioctl.c fs: compat_ioctl: add pretimeout functions for watchdogs 2016-09-24 09:27:18 +02:00
coredump.c coredump: fix unfreezable coredumping task 2016-11-11 08:12:37 -08:00
dax.c fs: break out of iomap_file_buffered_write on fatal signals 2017-02-09 08:08:31 +01:00
dcache.c mnt: Protect the mountpoint hashtable with mount_lock 2017-01-19 20:18:03 +01:00
dcookies.c
direct-io.c fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
drop_caches.c
eventfd.c
eventpoll.c
exec.c ptrace: Capture the ptracer's creds not PT_PTRACE_CAP 2017-01-06 10:40:13 +01:00
fcntl.c
fhandle.c
file.c fs/file: more unsigned file descriptors 2016-09-27 18:47:38 -04:00
file_table.c
filesystems.c
fs-writeback.c mm, writeback: flush plugged IO in wakeup_flusher_threads() 2016-08-09 19:58:06 -06:00
fs_pin.c
fs_struct.c
inode.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
internal.h Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 13:04:49 -07:00
ioctl.c vfs: cap dedupe request structure size at PAGE_SIZE 2016-09-15 13:29:52 -07:00
iomap.c fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
Kconfig mm/hugetlb: introduce ARCH_HAS_GIGANTIC_PAGE 2016-10-07 18:46:29 -07:00
Kconfig.binfmt ARM: 8594/1: enable binfmt_flat on systems with an MMU 2016-08-12 16:47:05 +01:00
libfs.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
locks.c locking, fs/locks: Add missing file_sem locks 2016-10-18 12:21:28 +02:00
Makefile
mbcache.c mbcache: fix to detect failure of register_shrinker 2016-08-31 11:44:36 -04:00
mount.h mnt: Tuck mounts under others instead of creating shadow/side mounts. 2017-03-15 10:02:43 +08:00
mpage.c fs: add i_blocksize() 2017-06-14 15:06:00 +02:00
namei.c fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
namespace.c fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
no-block.c
nsfs.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
open.c xfs: reflink update for 4.9-rc1 2016-10-13 20:28:22 -07:00
pipe.c pipe: cap initial pipe capacity according to pipe-max-size limit 2016-10-11 15:06:32 -07:00
pnode.c mnt: Tuck mounts under others instead of creating shadow/side mounts. 2017-03-15 10:02:43 +08:00
pnode.h mnt: Tuck mounts under others instead of creating shadow/side mounts. 2017-03-15 10:02:43 +08:00
posix_acl.c tmpfs: clear S_ISGID when setting posix ACLs 2017-01-26 08:24:37 +01:00
proc_namespace.c
read_write.c iov_iter: kernel-doc import_iovec() and rw_copy_check_uvector() 2016-10-14 20:00:34 -04:00
readdir.c
select.c fs/select: add vmalloc fallback for select(2) 2016-10-11 15:06:30 -07:00
seq_file.c seq/proc: modify seq_put_decimal_[u]ll to take a const char *, not char 2016-10-07 18:46:30 -07:00
signalfd.c
splice.c vfs: fix uninitialized flags in splice_to_pipe() 2017-02-23 17:44:35 +01:00
stack.c
stat.c ufs: restore maintaining ->i_blocks 2017-06-14 15:06:01 +02:00
statfs.c
super.c fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00
sync.c
timerfd.c timerfd: Protect the might cancel mechanism proper 2017-05-08 07:47:54 +02:00
userfaultfd.c mm: introduce fault_env 2016-07-26 16:19:19 -07:00
utimes.c Merge remote-tracking branch 'jk/vfs' into work.misc 2016-10-08 11:06:08 -04:00
xattr.c fs/xattr.c: zero out memory copied to userspace in getxattr 2017-05-20 14:28:39 +02:00