tytso@mit.edu wrote:
>
> This is an updated submission of the extended attribute patches for
> ext2/3 (versus bk-current). Many thanks to Cristoph, Andrea, and Andrew
> for their suggestions and cleanups.
>
> This patch creates a meta block cache which is utilized by the ext3 and
> ext2 extended attribute patches (patches 2 and 3, respectively). This
> cache allows directory blocks to be indexed by multiple keys. In the
> case of the extended attribute patches, it is used to look up blocks by
> both the block number and by the hash of the extended attributes. This
> is extremely important to allow the sharing of acl's when stored as
> extended attributes. Otherwise every single file would require its own,
> separate, one block overhead to store then ACL, even though there might
> be a large number of files that have the same ACL.
>
The key thing here appears to be the cache entry:
+struct mb_cache_entry {
+ struct list_head e_lru_list;
+ struct mb_cache *e_cache;
+ atomic_t e_used;
+ dev_t e_dev;
+ unsigned long e_block;
+ struct list_head e_block_list;
+ struct mb_cache_entry_index e_indexes[0];
+};
This should be converted to use sector_t for >2TB support, and tested
with CONFIG_LBD=y and n.
The use of a dev_t search key is a bit old-fashioned. Maybe
use the address of inode->i_sb->s_bdev?
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This archive was generated by hypermail 2b29 : Tue Oct 15 2002 - 22:00:59 EST