---1247997369-1920079519-930327660=:29126
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine.LNX.3.96.990625182129.29126D@chiara.csoma.elte.hu>
Linus,
the attached patch fixes all known pagecache/buffer cache related bugs in
pre3-2.3.9. It contains:
- David's Sparc DMA bugfix and page-uptodate bugfix. [i've modified his
bugfix slightly so that partial reads on 1k filesystems work correctly
too] These fixed the last, nasty 'beyond end of device' bugs.
- i reworked end_buffer_io_async() and mark_buffer_uptodate(), they were
rather redundant. mark_buffer_uptodate() does no more set the page
uptodate - this also speeds up lots of other places. Eg. what
mark_buffer_uptodate() does when called from filesystem drivers is
mostly unnecessery, metadata block's update bits is combined with
unrelated blocks, so setting the page uptodate makes no sense.
this is also a nice performance optimization, mark_buffer_uptodate() is
now nicely inlined into various filesystems - since the 'uptodate'
parameter is almost always constant.
[David also removed the reuse_list (noticed by V Ganesh), and i removed
BH_protected logic, these two were obsolete concepts.]
- to clean up some of the recent ext2fs changes and the ugly interfaces
that resulted, i changed the inode_operations API to have two bmap()
variants:
+ /*
+ * 'reading' variant of bmap. It provides a (supposedly) quick
+ * lookup of already existing blocks within an inode, 0 means
+ * a 'filesystem hole'.
+ */
+ long (*bmap) (struct inode *, long);
+ /*
+ * allocating variant of bmap. Compatible with bmap but doesnt
+ * preserve holes and is usually slower. Can signal out-of-space
+ * or other non-fatal exceptions.
+ */
+ long (*bmap_create) (struct inode *, long, int *, int *);
+
the 'normal', read-side bmap() is fast and can be heavily inlined, a good
example is ext2_bmap().
bmap_create() is a (conceptually) much heavier function, has to deal with
lots of side-effects and thus typically is not inlined and is slower as
well. It also includes fields for error code and 'new block' return codes.
The 'new block' information can be used by the generic block layer to
optimize certain things. [i'll send a separate patch that optimizes the
memset() in block_write_partial_page() and combines it with the
memcpy_from_user()]
this removed the very ugly 'create' parameter of get_fs_block(), and also
decreased the size of the call-chain within the write path and reduced the
number of parameters. block_write_partial|full_page() now depends on
bmap_create() purely - things are visibly nicer now, and the 'internal'
allocation-function-pointer passing is gone, it's now a 'public'
interface.
unfortunately this change broke 'other' filesystems again, so only the
core kernel file objects, swapping, ext2, procfs and NFSfs work. [all
tested]
- to not let yesterday's triple-indirection ext2fs bug happen again, i
cleaned up much of ext2_bmap_create() [formerly ext2_get_block], so it's
now i think much more maintainable. I have tested it with big files and
various workloads. Again i got rid of a couple of unnecessery parameters
and ugly parameter passing.
i've tested these changes and everything is fine now - first time in 4
weeks that i cannot crash my box or corrupt files :)
-- mingo
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---1247997369-1920079519-930327660=:29126--
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