Hello, Jens.
These are fixes to generic tag support in the blk layer. They all
compile okay and I've proof read it, but as I don't have any HBA which
uses generic tag support, I wasn't able to test directly. However,
all changes are fairly straight-forward.
[ Start of patch descriptions ]
01_blk_tag_map_use_find_first_zero_bit.patch
: use find_first_zero_bit() in blk_queue_start_tag()
blk_queue_start_tag() hand-coded searching for the first zero
bit in the tag map. Replace it with find_first_zero_bit().
With this patch, blk_queue_star_tag() doesn't need to fill
remains of tag map with 1, thus allowing it to work properly
with the next remove_real_max_depth patch.
02_blk_tag_map_remove_real_max_depth.patch
: remove blk_queue_tag->real_max_depth optimization
blk_queue_tag->real_max_depth was used to optimize out
unnecessary allocations/frees on tag resize. However, the
whole thing was very broken - tag_map was never allocated to
real_max_depth resulting in access beyond the end of the map,
bits in [max_depth..real_max_depth] were set when initializing
a map and copied when resizing resulting in pre-occupied tags.
As the gain of the optimization is very small, well, almost
nill, remove the whole thing.
03_blk_tag_map_remove_BLK_TAGS_PER_LONG.patch
: remove BLK_TAGS_{PER_LONG|MASK}
Replace BLK_TAGS_PER_LONG with BITS_PER_LONG and remove unused
BLK_TAGS_MASK.
04_blk_tag_map_error_handling_cleanup.patch
: cleanup generic tag support error messages
Add KERN_ERR and __FUNCTION__ to generic tag error messages,
and add a comment in blk_queue_end_tag() which explains the
silent failure path.
[ End of patch descriptions ]
Thanks a lot. :-)
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