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d24a10b9f8
linux/fs/ocfs2
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Tristan Ye d24a10b9f8 Ocfs2: Add a new code 'OCFS2_INFO_FREEFRAG' for o2info ioctl. 
This new code is a bit more complicated than former ones, the goal is to
show user all statistics required to take a deep insight into filesystem
on how the disk is being fragmentaed.

The goal is achieved by scaning global bitmap from (cluster)group to group
to figure out following factors in the filesystem:

        - How many free chunks in a fixed size as user requested.
        - How many real free chunks in all size.
        - Min/Max/Avg size(in) clusters of free chunks.
        - How do free chunks distribute(in size) in terms of a histogram,
          just like following:
          ---------------------------------------------------------
          Extent Size Range :  Free extents  Free Clusters  Percent
             32K...   64K-  :             1             1    0.00%
              1M...    2M-  :             9           288    0.03%
              8M...   16M-  :             2           831    0.09%
             32M...   64M-  :             1          2047    0.23%
            128M...  256M-  :             1          8191    0.92%
            256M...  512M-  :             2         21706    2.43%
            512M... 1024M-  :            27        858623   96.29%
          ---------------------------------------------------------

Userspace ioctl() call eventually gets the above info returned by passing
a 'struct ocfs2_info_freefrag' with the chunk_size being specified first.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
2011-05-25 12:18:07 +08:00
..
cluster ocfs2/cluster: Heartbeat mismatch message improved 2011-05-13 11:27:02 -07:00
dlm ocfs2/dlm: Target node death during resource migration leads to thread spin 2011-05-13 11:27:30 -07:00
dlmfs fs: change to new flag variable 2011-03-17 14:02:57 +01:00
acl.c Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2011-03-28 13:03:31 -07:00
acl.h fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
alloc.c Fix common misspellings 2011-03-31 11:26:23 -03:00
alloc.h ocfs2: Remove unused truncate function from alloc.c 2011-01-07 18:03:00 -08:00
aops.c Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2011-03-28 13:03:31 -07:00
aops.h Fix common misspellings 2011-03-31 11:26:23 -03:00
blockcheck.c
blockcheck.h
buffer_head_io.c ocfs2: Remove masklog ML_UPTODATE. 2011-02-24 16:22:20 +08:00
buffer_head_io.h
dcache.c ocfs2: fix d_revalidate oopsen on NFS exports 2011-03-10 03:45:07 -05:00
dcache.h
dir.c ocfs2: Initialize data_ac (might be used uninitialized) 2011-05-13 11:26:15 -07:00
dir.h
dlmglue.c Merge branch 'mlog_replace_for_39' of git://repo.or.cz/taoma-kernel into ocfs2-merge-window-fix 2011-03-28 09:44:26 -07:00
dlmglue.h
export.c exportfs: Return the minimum required handle size 2011-03-14 09:15:28 -04:00
export.h
extent_map.c ocfs2: Remove masklog ML_EXTENT_MAP. 2011-02-22 22:27:33 +08:00
extent_map.h
file.c ocfs2: skip existing hole when removing the last extent_rec in punching-hole codes. 2011-05-13 11:26:20 -07:00
file.h fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
heartbeat.c ocfs2: Remove mlog(0) from fs/ocfs2/heartbeat.c 2011-02-23 21:17:39 +08:00
heartbeat.h
inode.c Fix common misspellings 2011-03-31 11:26:23 -03:00
inode.h
ioctl.c Ocfs2: Add a new code 'OCFS2_INFO_FREEFRAG' for o2info ioctl. 2011-05-25 12:18:07 +08:00
ioctl.h
journal.c ocfs2: Skip mount recovery for hard-ro mounts 2011-05-13 11:27:14 -07:00
journal.h Fix common misspellings 2011-03-31 11:26:23 -03:00
Kconfig ocfs2: Make OCFS2_FS depend on CONFIGFS_FS 2011-01-16 21:22:40 +00:00
localalloc.c ocfs2: Remove EXIT from masklog. 2011-03-07 16:43:21 +08:00
localalloc.h
locks.c ocfs2: remove INODE from unused files. 2011-02-21 11:18:23 +08:00
locks.h
Makefile fs: change to new flag variable 2011-03-17 14:02:57 +01:00
mmap.c ocfs2: Remove FILE_IO from masklog. 2011-02-22 21:59:46 +08:00
mmap.h
namei.c Fix common misspellings 2011-03-31 11:26:23 -03:00
namei.h
ocfs1_fs_compat.h
ocfs2_fs.h Revert wrong fixes for common misspellings 2011-04-26 23:31:11 -07:00
ocfs2_ioctl.h Ocfs2: Add a new code 'OCFS2_INFO_FREEFRAG' for o2info ioctl. 2011-05-25 12:18:07 +08:00
ocfs2_lockid.h
ocfs2_lockingver.h
ocfs2_trace.h ocfs2: Remove masklog ML_UPTODATE. 2011-02-24 16:22:20 +08:00
ocfs2.h Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2011-03-28 13:03:31 -07:00
quota_global.c Fix common misspellings 2011-03-31 11:26:23 -03:00
quota_local.c ocfs2: Remove mlog(0) from quota_local.c. 2011-02-23 22:12:48 +08:00
quota.h ocfs2: use system_wq instead of ocfs2_quota_wq 2011-02-01 11:42:42 +01:00
refcounttree.c Merge branch 'master' into for-next 2011-04-26 10:22:59 +02:00
refcounttree.h
reservations.c ocfs2: Remove masklog ML_RESERVATIONS. 2011-02-23 22:10:56 +08:00
reservations.h Fix common misspellings 2011-03-31 11:26:23 -03:00
resize.c ocfs2: Remove mlog(0) from fs/ocfs2/suballoc.c 2011-02-22 08:24:01 +08:00
resize.h
slot_map.c ocfs2: Remove mlog(0) from fs/ocfs2/slot_map.c 2011-02-22 22:29:08 +08:00
slot_map.h
stack_o2cb.c
stack_user.c ocfs2_connection_find() returns pointer to bad structure 2010-11-18 15:41:41 -08:00
stackglue.c
stackglue.h Fix common misspellings 2011-03-31 11:26:23 -03:00
suballoc.c Fix common misspellings 2011-03-31 11:26:23 -03:00
suballoc.h
super.c Fix common misspellings 2011-03-31 11:26:23 -03:00
super.h
symlink.c ocfs2: Remove EXIT from masklog. 2011-03-07 16:43:21 +08:00
symlink.h
sysfile.c ocfs2: Remove mlog(0) from fs/ocfs2/file.c 2011-02-22 22:14:41 +08:00
sysfile.h
uptodate.c ocfs2: Remove masklog ML_UPTODATE. 2011-02-24 16:22:20 +08:00
uptodate.h
ver.c
ver.h
xattr.c Fix common misspellings 2011-03-31 11:26:23 -03:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00