linux-toradex.git/fs/nilfs2/the_nilfs.h, branch v3.19.3

nilfs2: add missing blkdev_issue_flush() to nilfs_sync_fs()

2014-10-14T00:18:20+00:00

Under normal circumstances nilfs_sync_fs() writes out the super block,
which causes a flush of the underlying block device.  But this depends
on the THE_NILFS_SB_DIRTY flag, which is only set if the pointer to the
last segment crosses a segment boundary.  So if only a small amount of
data is written before the call to nilfs_sync_fs(), no flush of the
block device occurs.

In the above case an additional call to blkdev_issue_flush() is needed.
To prevent unnecessary overhead, the new flag nilfs->ns_flushed_device
is introduced, which is cleared whenever new logs are written and set
whenever the block device is flushed.  For convenience the function
nilfs_flush_device() is added, which contains the above logic.

Signed-off-by: Andreas Rohner 
Signed-off-by: Ryusuke Konishi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: add /sys/fs/nilfs2//mounted_snapshots/ group

2014-08-08T22:57:21+00:00

This patch adds creation of  group for every mounted
snapshot in /sys/fs/nilfs2//mounted_snapshots group.

The group contains details about mounted snapshot:
(1) inodes_count - show number of inodes for snapshot.
(2) blocks_count - show number of blocks for snapshot.

Signed-off-by: Vyacheslav Dubeyko 
Cc: Vyacheslav Dubeyko 
Cc: Ryusuke Konishi 
Cc: Michael L. Semon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: add /sys/fs/nilfs2//superblock group

2014-08-08T22:57:20+00:00

This patch adds creation of /sys/fs/nilfs2//superblock
group.

The superblock group contains attributes that describe
superblock's details:
(1) sb_write_time - show previous write time of super block in
human-readable format.
(2) sb_write_time_secs - show previous write time of super block
in seconds.
(3) sb_write_count - show write count of super block.
(4) sb_update_frequency - show/set interval of periodical update
of superblock (in seconds). You can set preferable frequency of
superblock update by command:

echo  > /sys/fs/nilfs2//superblock/sb_update_frequency

Signed-off-by: Vyacheslav Dubeyko 
Cc: Vyacheslav Dubeyko 
Cc: Ryusuke Konishi 
Cc: Michael L. Semon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: add /sys/fs/nilfs2/ group

2014-08-08T22:57:20+00:00

This patch adds creation of /sys/fs/nilfs2/ group.

The  group contains attributes that describe file
system partition's details:
(1) revision - show NILFS file system revision.
(2) blocksize - show volume block size in bytes.
(3) device_size - show volume size in bytes.
(4) free_blocks - show count of free blocks on volume.
(5) uuid - show volume's UUID.
(6) volume_name - show volume's name.

Signed-off-by: Vyacheslav Dubeyko 
Cc: Vyacheslav Dubeyko 
Cc: Ryusuke Konishi 
Cc: Michael L. Semon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

] nilfs2: use atomic64_t type for inodes_count and blocks_count fields in nilfs_root struct

2013-07-03T23:08:01+00:00

The cp_inodes_count and cp_blocks_count are represented as __le64 type in
on-disk structure (struct nilfs_checkpoint).  But analogous fields in
in-core structure (struct nilfs_root) are represented by atomic_t type.

This patch replaces atomic_t on atomic64_t type in representation of
inodes_count and blocks_count fields in struct nilfs_root.

Signed-off-by: Vyacheslav Dubeyko 
Acked-by: Ryusuke Konishi 
Acked-by: Joern Engel 
Cc: Clemens Eisserer 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: nuke write_super from comments

2012-08-04T08:15:38+00:00

The '->write_super' superblock method is gone, and this patch removes all the
references to 'write_super' from ntfs.

Cc: KONISHI Ryusuke 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: Al Viro

nilfs2: add omitted comments for different structures in driver implementation

2012-07-31T00:25:19+00:00

Add omitted comments for different structures in driver implementation.

Signed-off-by: Vyacheslav Dubeyko 
Signed-off-by: Ryusuke Konishi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: fix deadlock issue between chcp and thaw ioctls

2012-07-31T00:25:19+00:00

An fs-thaw ioctl causes deadlock with a chcp or mkcp -s command:

 chcp            D ffff88013870f3d0     0  1325   1324 0x00000004
 ...
 Call Trace:
   nilfs_transaction_begin+0x11c/0x1a0 [nilfs2]
   wake_up_bit+0x20/0x20
   copy_from_user+0x18/0x30 [nilfs2]
   nilfs_ioctl_change_cpmode+0x7d/0xcf [nilfs2]
   nilfs_ioctl+0x252/0x61a [nilfs2]
   do_page_fault+0x311/0x34c
   get_unmapped_area+0x132/0x14e
   do_vfs_ioctl+0x44b/0x490
   __set_task_blocked+0x5a/0x61
   vm_mmap_pgoff+0x76/0x87
   __set_current_blocked+0x30/0x4a
   sys_ioctl+0x4b/0x6f
   system_call_fastpath+0x16/0x1b
 thaw            D ffff88013870d890     0  1352   1351 0x00000004
 ...
 Call Trace:
   rwsem_down_failed_common+0xdb/0x10f
   call_rwsem_down_write_failed+0x13/0x20
   down_write+0x25/0x27
   thaw_super+0x13/0x9e
   do_vfs_ioctl+0x1f5/0x490
   vm_mmap_pgoff+0x76/0x87
   sys_ioctl+0x4b/0x6f
   filp_close+0x64/0x6c
   system_call_fastpath+0x16/0x1b

where the thaw ioctl deadlocked at thaw_super() when called while chcp was
waiting at nilfs_transaction_begin() called from
nilfs_ioctl_change_cpmode().  This deadlock is 100% reproducible.

This is because nilfs_ioctl_change_cpmode() first locks sb->s_umount in
read mode and then waits for unfreezing in nilfs_transaction_begin(),
whereas thaw_super() locks sb->s_umount in write mode.  The locking of
sb->s_umount here was intended to make snapshot mounts and the downgrade
of snapshots to checkpoints exclusive.

This fixes the deadlock issue by replacing the sb->s_umount usage in
nilfs_ioctl_change_cpmode() with a dedicated mutex which protects snapshot
mounts.

Signed-off-by: Ryusuke Konishi 
Cc: Fernando Luis Vazquez Cao 
Tested-by: Ryusuke Konishi 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: add omitted comment for ns_mount_state field of the_nilfs structure

2012-07-31T00:25:19+00:00

Add omitted comment for ns_mount_state field of the_nilfs structure.

Signed-off-by: Vyacheslav Dubeyko 
Signed-off-by: Ryusuke Konishi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nilfs2: implement resize ioctl

2011-05-10T13:21:46+00:00

This adds resize ioctl which makes online resize possible.

Signed-off-by: Ryusuke Konishi