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authorLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 13:57:49 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 13:57:49 -0400
commit395d73413c5656c6d7706ae91dcb441f9b7e3074 (patch)
tree7fadabe996f70d7918583fa2312d4fad19397fcb /Documentation/ABI
parentc226fd659fa7b6a7b038df5ae6856a68514bacde (diff)
parent06705bff9114531a997a7d0c2520bea0f2927410 (diff)
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (33 commits) ext4: Regularize mount options ext4: fix locking typo in mballoc which could cause soft lockup hangs ext4: fix typo which causes a memory leak on error path jbd2: Update locking coments ext4: Rename pa_linear to pa_type ext4: add checks of block references for non-extent inodes ext4: Check for an valid i_mode when reading the inode from disk ext4: Use WRITE_SYNC for commits which are caused by fsync() ext4: Add auto_da_alloc mount option ext4: Use struct flex_groups to calculate get_orlov_stats() ext4: Use atomic_t's in struct flex_groups ext4: remove /proc tuning knobs ext4: Add sysfs support ext4: Track lifetime disk writes ext4: Fix discard of inode prealloc space with delayed allocation. ext4: Automatically allocate delay allocated blocks on rename ext4: Automatically allocate delay allocated blocks on close ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl ext4: Simplify delalloc code by removing mpage_da_writepages() ext4: Save stack space by removing fake buffer heads ...
Diffstat (limited to 'Documentation/ABI')
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1What: /sys/fs/ext4/<disk>/mb_stats
2Date: March 2008
3Contact: "Theodore Ts'o" <tytso@mit.edu>
4Description:
5 Controls whether the multiblock allocator should
6 collect statistics, which are shown during the unmount.
7 1 means to collect statistics, 0 means not to collect
8 statistics
9
10What: /sys/fs/ext4/<disk>/mb_group_prealloc
11Date: March 2008
12Contact: "Theodore Ts'o" <tytso@mit.edu>
13Description:
14 The multiblock allocator will round up allocation
15 requests to a multiple of this tuning parameter if the
16 stripe size is not set in the ext4 superblock
17
18What: /sys/fs/ext4/<disk>/mb_max_to_scan
19Date: March 2008
20Contact: "Theodore Ts'o" <tytso@mit.edu>
21Description:
22 The maximum number of extents the multiblock allocator
23 will search to find the best extent
24
25What: /sys/fs/ext4/<disk>/mb_min_to_scan
26Date: March 2008
27Contact: "Theodore Ts'o" <tytso@mit.edu>
28Description:
29 The minimum number of extents the multiblock allocator
30 will search to find the best extent
31
32What: /sys/fs/ext4/<disk>/mb_order2_req
33Date: March 2008
34Contact: "Theodore Ts'o" <tytso@mit.edu>
35Description:
36 Tuning parameter which controls the minimum size for
37 requests (as a power of 2) where the buddy cache is
38 used
39
40What: /sys/fs/ext4/<disk>/mb_stream_req
41Date: March 2008
42Contact: "Theodore Ts'o" <tytso@mit.edu>
43Description:
44 Files which have fewer blocks than this tunable
45 parameter will have their blocks allocated out of a
46 block group specific preallocation pool, so that small
47 files are packed closely together. Each large file
48 will have its blocks allocated out of its own unique
49 preallocation pool.
50
51What: /sys/fs/ext4/<disk>/inode_readahead
52Date: March 2008
53Contact: "Theodore Ts'o" <tytso@mit.edu>
54Description:
55 Tuning parameter which controls the maximum number of
56 inode table blocks that ext4's inode table readahead
57 algorithm will pre-read into the buffer cache
58
59What: /sys/fs/ext4/<disk>/delayed_allocation_blocks
60Date: March 2008
61Contact: "Theodore Ts'o" <tytso@mit.edu>
62Description:
63 This file is read-only and shows the number of blocks
64 that are dirty in the page cache, but which do not
65 have their location in the filesystem allocated yet.
66
67What: /sys/fs/ext4/<disk>/lifetime_write_kbytes
68Date: March 2008
69Contact: "Theodore Ts'o" <tytso@mit.edu>
70Description:
71 This file is read-only and shows the number of kilobytes
72 of data that have been written to this filesystem since it was
73 created.
74
75What: /sys/fs/ext4/<disk>/session_write_kbytes
76Date: March 2008
77Contact: "Theodore Ts'o" <tytso@mit.edu>
78Description:
79 This file is read-only and shows the number of
80 kilobytes of data that have been written to this
81 filesystem since it was mounted.