linux-stable.git/fs/ext4/sysfs.c, branch linux-4.9.y

ext4: sysfs: print ext4_super_block fields as little-endian

2018-09-05T07:20:06+00:00

commit a4d2aadca184ece182418950d45ba4ffc7b652d2 upstream.

While working on extended rand for last_error/first_error timestamps,
I noticed that the endianess is wrong; we access the little-endian
fields in struct ext4_super_block as native-endian when we print them.

This adds a special case in ext4_attr_show() and ext4_attr_store()
to byteswap the superblock fields if needed.

In older kernels, this code was part of super.c, it got moved to
sysfs.c in linux-4.4.

Cc: stable@vger.kernel.org
Fixes: 52c198c6820f ("ext4: add sysfs entry showing whether the fs contains errors")
Reviewed-by: Andreas Dilger 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: check return value of kstrtoull correctly in reserved_clusters_store

2017-07-15T10:16:16+00:00

commit 1ea1516fbbab2b30bf98c534ecaacba579a35208 upstream.

kstrtoull returns 0 on success, however, in reserved_clusters_store we
will return -EINVAL if kstrtoull returns 0, it makes us fail to update
reserved_clusters value through sysfs.

Fixes: 76d33bca5581b1dd5c3157fa168db849a784ada4
Signed-off-by: Chao Yu 
Signed-off-by: Miao Xie 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: do not advertise encryption support when disabled

2016-10-13T03:24:51+00:00

The sysfs file /sys/fs/ext4/features/encryption was present on kernels
compiled with CONFIG_EXT4_FS_ENCRYPTION=n.  This was misleading because
such kernels do not actually support ext4 encryption.  Therefore, only
provide this file on kernels compiled with CONFIG_EXT4_FS_ENCRYPTION=y.

Note: since the ext4 feature files are all hardcoded to have a contents
of "supported", it really is the presence or absence of the file that is
significant, not the contents (and this change reflects that).

Signed-off-by: Eric Biggers 
Signed-off-by: Theodore Ts'o 
Cc: stable@vger.kernel.org

drop redundant ->owner initializations

2016-05-29T23:08:00+00:00

it's not needed for file_operations of inodes located on fs defined
in the hosting module and for file_operations that go into procfs.

Signed-off-by: Al Viro

ext4: add "static" to ext4_seq_##name##_fops struct

2015-11-26T20:52:24+00:00

to fix sparse warning, add static to ext4_seq_##name##_fops struct.

Signed-off-by: Theodore Ts'o

ext4: store checksum seed in superblock

2015-10-17T20:16:02+00:00

Allow the filesystem to store the metadata checksum seed in the
superblock and add an incompat feature to say that we're using it.
This enables tune2fs to change the UUID on a mounted metadata_csum
FS without having to (racy!) rewrite all disk metadata.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Theodore Ts'o

ext4: move procfs registration code to fs/ext4/sysfs.c

2015-09-23T16:46:17+00:00

This allows us to refactor the procfs code, which saves a bit of
compiled space.  More importantly it isolates most of the procfs
support code into a single file, so it's easier to #ifdef it out if
the proc file system has been disabled.

Signed-off-by: Theodore Ts'o

ext4: refactor sysfs support code

2015-09-23T16:45:17+00:00

Make the code more easily extensible as well as taking up less
compiled space.

Signed-off-by: Theodore Ts'o

ext4: move sysfs code from super.c to fs/ext4/sysfs.c

2015-09-23T16:44:17+00:00

Also statically allocate the ext4_kset and ext4_feat objects, since we
only need exactly one of each, and it's simpler and less code if we
drop the dynamic allocation and deallocation when it's not needed.

Signed-off-by: Theodore Ts'o