Etienne Dechamps ee5fd0bb80 Set zvol discard_granularity to the volblocksize. ... Currently, zvols have a discard granularity set to 0, which suggests to the upper layer that discard requests of arbirarily small size and alignment can be made efficiently. In practice however, ZFS does not handle unaligned discard requests efficiently: indeed, it is unable to free a part of a block. It will write zeros to the specified range instead, which is both useless and inefficient (see dnode_free_range). With this patch, zvol block devices expose volblocksize as their discard granularity, so the upper layer is aware that it's not supposed to send discard requests smaller than volblocksize. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #862		2012-08-07 14:55:31 -07:00
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libzfs_changelist.c	Remove HAVE_ZPL from commands and libraries	2011-02-04 16:14:34 -08:00
libzfs_config.c	Fix gcc missing braces warnings	2010-08-27 15:34:03 -07:00
libzfs_dataset.c	Illumos #1644, #1645, #1646, #1647, #1708	2012-07-31 09:25:30 -07:00
libzfs_diff.c	Add linux compatibility	2010-08-31 13:41:59 -07:00
libzfs_fru.c	Add linux topology support	2010-08-31 13:42:00 -07:00
libzfs_graph.c	Fix gcc missing braces warnings	2010-08-27 15:34:03 -07:00
libzfs_import.c	Improve 'zpool import' safety	2011-02-17 09:35:43 -08:00
libzfs_iter.c	Illumos #1644, #1645, #1646, #1647, #1708	2012-07-31 09:25:30 -07:00
libzfs_mount.c	Add overlay(-O) mount option support	2012-01-12 15:49:38 -08:00
libzfs_pool.c	Move partition scanning from userspace to module.	2012-07-17 09:17:31 -07:00
libzfs_sendrecv.c	Illumos #1644, #1645, #1646, #1647, #1708	2012-07-31 09:25:30 -07:00
libzfs_status.c	Use gethostid in the Linux convention.	2011-04-25 10:36:17 -05:00
libzfs_util.c	Illumos #1644, #1645, #1646, #1647, #1708	2012-07-31 09:25:30 -07:00
Makefile.am	Illumos #1644, #1645, #1646, #1647, #1708	2012-07-31 09:25:30 -07:00
Makefile.in	Set zvol discard_granularity to the volblocksize.	2012-08-07 14:55:31 -07:00