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| author | Andreas Dilger <adilger@sun.com> | 2009-06-13 17:45:35 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-06-13 17:45:35 +0200 |
| commit | 11013911daea4820147ae6d7094dd7c6894e8651 (patch) | |
| tree | f8e9f9d2058e0dfc826d4df3d88a7eb18a56b3f3 /Documentation/ABI | |
| parent | ext4: Use a hash of the topdir directory name for the Orlov parent group (diff) | |
| download | linux-11013911daea4820147ae6d7094dd7c6894e8651.tar.xz linux-11013911daea4820147ae6d7094dd7c6894e8651.zip | |
ext4: teach the inode allocator to use a goal inode number
Enhance the inode allocator to take a goal inode number as a
paremeter; if it is specified, it takes precedence over Orlov or
parent directory inode allocation algorithms.
The extents migration function uses the goal inode number so that the
extent trees allocated the migration function use the correct flex_bg.
In the future, the goal inode functionality will also be used to
allocate an adjacent inode for the extended attributes.
Also, for testing purposes the goal inode number can be specified via
/sys/fs/{dev}/inode_goal. This can be useful for testing inode
allocation beyond 2^32 blocks on very large filesystems.
Signed-off-by: Andreas Dilger <adilger@sun.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-ext4 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-ext4 b/Documentation/ABI/testing/sysfs-fs-ext4 index 4e79074de282..5fb709997d96 100644 --- a/Documentation/ABI/testing/sysfs-fs-ext4 +++ b/Documentation/ABI/testing/sysfs-fs-ext4 @@ -79,3 +79,13 @@ Description: This file is read-only and shows the number of kilobytes of data that have been written to this filesystem since it was mounted. + +What: /sys/fs/ext4/<disk>/inode_goal +Date: June 2008 +Contact: "Theodore Ts'o" <tytso@mit.edu> +Description: + Tuning parameter which (if non-zero) controls the goal + inode used by the inode allocator in p0reference to + all other allocation hueristics. This is intended for + debugging use only, and should be 0 on production + systems. |