linux-toradex.git/fs/affs/super.c, branch v4.10

affs: fix remount failure when there are no options changed

2016-05-28T23:50:24+00:00

Commit c8f33d0bec99 ("affs: kstrdup() memory handling") checks if the
kstrdup function returns NULL due to out-of-memory condition.

However, if we are remounting a filesystem with no change to
filesystem-specific options, the parameter data is NULL.  In this case,
kstrdup returns NULL (because it was passed NULL parameter), although no
out of memory condition exists.  The mount syscall then fails with
ENOMEM.

This patch fixes the bug.  We fail with ENOMEM only if data is non-NULL.

The patch also changes the call to replace_mount_options - if we didn't
pass any filesystem-specific options, we don't call
replace_mount_options (thus we don't erase existing reported options).

Fixes: c8f33d0bec99 ("affs: kstrdup() memory handling")
Signed-off-by: Mikulas Patocka 
Cc: stable@vger.kernel.org	# v4.1+
Signed-off-by: Linus Torvalds

kmemcg: account certain kmem allocations to memcg

2016-01-15T00:00:49+00:00

Mark those kmem allocations that are known to be easily triggered from
userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to
memcg.  For the list, see below:

 - threadinfo
 - task_struct
 - task_delay_info
 - pid
 - cred
 - mm_struct
 - vm_area_struct and vm_region (nommu)
 - anon_vma and anon_vma_chain
 - signal_struct
 - sighand_struct
 - fs_struct
 - files_struct
 - fdtable and fdtable->full_fds_bits
 - dentry and external_name
 - inode for all filesystems. This is the most tedious part, because
   most filesystems overwrite the alloc_inode method.

The list is far from complete, so feel free to add more objects.
Nevertheless, it should be close to "account everything" approach and
keep most workloads within bounds.  Malevolent users will be able to
breach the limit, but this was possible even with the former "account
everything" approach (simply because it did not account everything in
fact).

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Vladimir Davydov 
Acked-by: Johannes Weiner 
Acked-by: Michal Hocko 
Cc: Tejun Heo 
Cc: Greg Thelen 
Cc: Christoph Lameter 
Cc: Pekka Enberg 
Cc: David Rientjes 
Cc: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs:affs:Replace time_t with time64_t

2016-01-09T07:59:19+00:00

The affs code uses "time_t" and "get_seconds()". This will cause
problems on 32-bit architectures in 2038 when time_t overflows.
This patch replaces them with "time64_t" and
"ktime_get_real_seconds()". This patch introduces expensive 64-bit
divsion in "secs_to_datestamp()", considering this function is not
called so often, the cost should be acceptable.

Reviewed-by: Arnd Bergmann 
Signed-off-by: DengChao 
Signed-off-by: Al Viro

fs/affs: make root lookup from blkdev logical size

2015-09-10T20:29:01+00:00

This patch resolves https://bugzilla.kernel.org/show_bug.cgi?id=16531.

When logical blkdev size > 512 then sector numbers become larger than the
device can support.

Make affs start lookup based on the device's logical sector size instead
of 512.

Reported-by: Mark 
Suggested-by: Mark 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

affs: kstrdup() memory handling

2015-04-17T13:04:09+00:00

There is a possibility of kstrdup() failure upon memory pressure.
Therefore, returning ENOMEM even for new_opts.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Sanidhya Kashyap 
Cc: Taesoo kim 
Cc: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/affs: use affs_test_opt()

2015-04-17T13:04:08+00:00

Replace mount option test by affs_test_opt().

Signed-off-by: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/affs/super.c: use affs_set_opt()

2015-04-17T13:04:08+00:00

Replace direct mount option assignation by affs_set_opt() macro.

Signed-off-by: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/affs: use AFFS_MOUNT prefix for mount options

2015-04-17T13:04:08+00:00

Currently, affs still uses direct access on mount_options.  This patch
prepares to use affs_clear/set/test_opt() like other filesystems.

Signed-off-by: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/affs/super.c: fix switch indentation

2015-02-17T22:34:53+00:00

Fix checkpatch error:

  ERROR: switch and case should be at the same indent

Signed-off-by: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/affs: define AFFSNAMEMAX to replace constant use

2015-02-17T22:34:52+00:00

30 was used all over the place to compare name length against
AFFS maximum name length.

Signed-off-by: Fabian Frederick 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds