linux/fs/exofs
Boaz Harrosh b916c5cd4d ore: Only IO one group at a time (API change)
Usually a single IO is confined to one group of devices
(group_width) and at the boundary of a raid group it can
spill into a second group. Current code would allocate a
full device_table size array at each io_state so it can
comply to requests that span two groups. Needless to say
that is very wasteful, specially when device_table count
can get very large (hundreds even thousands), while a
group_width is usually 8 or 10.

* Change ore API to trim on IO that spans two raid groups.
  The user passes offset+length to ore_get_rw_state, the
  ore might trim on that length if spanning a group boundary.
  The user must check ios->length or ios->nrpages to see
  how much IO will be preformed. It is the responsibility
  of the user to re-issue the reminder of the IO.

* Modify exofs To copy spilled pages on to the next IO.
  This means one last kick is needed after all coalescing
  of pages is done.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2011-10-14 18:52:50 +02:00
..
BUGS exofs: Documentation 2009-03-31 19:44:38 +03:00
common.h Fix common misspellings 2011-03-31 11:26:23 -03:00
dir.c exofs: Trivial: fix some indentation and debug prints 2011-03-15 15:00:27 +02:00
exofs.h ore/exofs: Change the type of the devices array (API change) 2011-10-04 12:13:59 +02:00
file.c fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers 2011-07-20 20:47:59 -04:00
inode.c ore: Only IO one group at a time (API change) 2011-10-14 18:52:50 +02:00
Kbuild ore: Make ore its own module 2011-08-06 19:36:19 -07:00
Kconfig ore: Make ore its own module 2011-08-06 19:36:19 -07:00
namei.c make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
ore.c ore: Only IO one group at a time (API change) 2011-10-14 18:52:50 +02:00
super.c ore/exofs: Change the type of the devices array (API change) 2011-10-04 12:13:59 +02:00
symlink.c exofs: Remove IBM copyrights 2009-06-21 17:53:47 +03:00