linux-toradex.git/fs/hpfs/super.c, branch v4.9.123

hpfs: implement the show_options method

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

The HPFS filesystem used generic_show_options to produce string that is
displayed in /proc/mounts.  However, there is a problem that the options
may disappear after remount.  If we mount the filesystem with option1
and then remount it with option2, /proc/mounts should show both option1
and option2, however it only shows option2 because the whole option
string is replaced with replace_mount_options in hpfs_remount_fs.

To fix this bug, implement the hpfs_show_options function that prints
options that are currently selected.

Signed-off-by: Mikulas Patocka 
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds

hpfs: fix remount failure when there are no options changed

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

Commit ce657611baf9 ("hpfs: kstrdup() out of 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: ce657611baf9 ("hpfs: kstrdup() out of memory handling")
Signed-off-by: Mikulas Patocka 
Cc: stable@vger.kernel.org
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

hpfs: support hotfixes

2015-09-03T18:55:30+00:00

When the OS/2 driver hits a disk write error, it writes the sector to
another location and adds the sector mapping to the hotfix map.

This patch makes the hpfs driver understand the hotfix map and remap
accesses accoring to it.

Signed-off-by: Mikulas Patocka 
Signed-off-by: Linus Torvalds

hpfs: hpfs_error: Remove static buffer, use vsprintf extension %pV instead

2015-07-09T20:35:31+00:00

Removing unnecessary static buffers is good.
Use the vsprintf %pV extension instead.

Signed-off-by: Joe Perches 
Signed-off-by: Mikulas Patocka 
Cc: stable@vger.kernel.org      # v2.6.36+
Signed-off-by: Linus Torvalds

hpfs: kstrdup() out of memory handling

2015-07-09T20:35:31+00:00

There is a possibility of nothing being allocated to the new_opts in
case of memory pressure, therefore return ENOMEM for such case.

Signed-off-by: Sanidhya Kashyap 
Signed-off-by: Mikulas Patocka 
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds

hpfs: Remove unessary cast

2015-07-09T20:35:31+00:00

Avoid a pointless kmem_cache_alloc() return value cast in
fs/hpfs/super.c::hpfs_alloc_inode()

Signed-off-by: Firo Yang 
Signed-off-by: Mikulas Patocka 
Signed-off-by: Linus Torvalds

hpfs: add fstrim support

2015-07-09T20:35:30+00:00

This patch adds support for fstrim to the HPFS filesystem.

Signed-off-by: Mikulas Patocka 
Signed-off-by: Linus Torvalds

fs/hpfs: increase pr_warn level

2014-06-06T23:08:10+00:00

This patch applies a suggestion by Mikulas Patocka asking to increase
all pr_warn without commented ones to pr_err

Signed-off-by: Fabian Frederick 
Cc: Mikulas Patocka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/hpfs: use pr_fmt for logging

2014-06-06T23:08:10+00:00

Also remove redundant level names (warning:...)

Signed-off-by: Fabian Frederick 
Cc: Mikulas Patocka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds