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ext4: teach the inode allocator to use a goal inode number

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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>
This commit is contained in:
Andreas Dilger
2009-06-13 11:45:35 -04:00
committed by Theodore Ts'o
parent f157a4aa98
commit 11013911da
6 changed files with 36 additions and 10 deletions
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10
Documentation/ABI/testing/sysfs-fs-ext4
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@@ -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.