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authorAndreas Dilger <adilger@sun.com>2009-06-13 11:45:35 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-06-13 11:45:35 -0400
commit11013911daea4820147ae6d7094dd7c6894e8651 (patch)
treef8e9f9d2058e0dfc826d4df3d88a7eb18a56b3f3 /Documentation
parentf157a4aa98a18bd3817a72bea90d48494e2586e7 (diff)
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')
-rw-r--r--Documentation/ABI/testing/sysfs-fs-ext410
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:
79 This file is read-only and shows the number of 79 This file is read-only and shows the number of
80 kilobytes of data that have been written to this 80 kilobytes of data that have been written to this
81 filesystem since it was mounted. 81 filesystem since it was mounted.
82
83What: /sys/fs/ext4/<disk>/inode_goal
84Date: June 2008
85Contact: "Theodore Ts'o" <tytso@mit.edu>
86Description:
87 Tuning parameter which (if non-zero) controls the goal
88 inode used by the inode allocator in p0reference to
89 all other allocation hueristics. This is intended for
90 debugging use only, and should be 0 on production
91 systems.