svn commit: r202283 - in head/sys: conf fs/ext2fs gnu/fs/ext2fs gnu/fs/reiserfs modules/ext2fs

[pluknet]

2010/1/14 Ulf Lilleengen <lulf at freebsd.org>:
> Author: lulf
> Date: Thu Jan 14 14:30:54 2010
> New Revision: 202283
> URL: http://svn.freebsd.org/changeset/base/202283
>

Sorry for my late comment.
Please, dedup those comments below (came from p4 165599).
thanks!

>  /*
>  * Allocate a block in the file system.
> - *
> - * this takes the framework from ffs_alloc. To implement the
> - * actual allocation, it calls ext2_new_block, the ported version
> - * of the same Linux routine.
>  *
> - * we note that this is always called in connection with ext2_blkpref
> + * A preference may be optionally specified. If a preference is given
> + * the following hierarchy is used to allocate a block:
> + *   1) allocate the requested block.
> + *   2) allocate a rotationally optimal block in the same cylinder.
> + *   3) allocate a block in the same cylinder group.
> + *   4) quadradically rehash into other cylinder groups, until an
> + *        available block is located.
> + * If no block preference is given the following hierarchy is used
> + * to allocate a block:
> + *   1) allocate a block in the cylinder group that contains the
> + *        inode for the file.
> + *   2) quadradically rehash into other cylinder groups, until an
> + *        available block is located.
>  *
> - * preallocation is done as Linux does it
> + * A preference may be optionally specified. If a preference is given
> + * the following hierarchy is used to allocate a block:
> + *   1) allocate the requested block.
> + *   2) allocate a rotationally optimal block in the same cylinder.
> + *   3) allocate a block in the same cylinder group.
> + *   4) quadradically rehash into other cylinder groups, until an
> + *        available block is located.
> + * If no block preference is given the following hierarchy is used
> + * to allocate a block:
> + *   1) allocate a block in the cylinder group that contains the
> + *        inode for the file.
> + *   2) quadradically rehash into other cylinder groups, until an
> + *        available block is located.
>  */

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