Etienne Dechamps bbdc6ae495 Add interface for file hole punching. ... This adds an interface to "punch holes" (deallocate space) in VFS files. The interface is identical to the Solaris VOP_SPACE interface. This interface is necessary for TRIM support on file vdevs. This is implemented using Linux fallocate(FALLOC_FL_PUNCH_HOLE), which was introduced in 2.6.38. For a brief time before 2.6.38 this was done using the truncate_range inode operation, which was quickly deprecated. This patch only supports FALLOC_FL_PUNCH_HOLE. This adds support for the truncate_range() inode operation to VOP_SPACE() for file hole punching. This API is deprecated and removed in 3.5, so it's only useful for old kernels. On tmpfs, the truncate_range() inode operation translates to shmem_truncate_range(). Unfortunately, this function expects the end offset to be inclusive and aligned to the end of a page. If it is not, the kernel will stop with a BUG_ON(). This patch fixes the issue by adapting to the constraints set forth by shmem_truncate_range(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #168		2012-10-04 16:22:07 -07:00
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.gitignore	Remove autotools products	2012-08-27 11:46:23 -07:00
arch.am	Don't build packages that haven't been selected.	2012-07-26 14:54:32 -07:00
config.awk	Allow spl_config.h to be included by dependant packages (updated)	2010-03-22 14:45:33 -07:00
deb.am	Don't build packages that haven't been selected.	2012-07-26 14:54:32 -07:00
rpm.am	Support building a spl-modules-dkms sub package	2012-08-08 13:49:40 -07:00
Rules.am	Support custom build directories	2010-09-05 21:49:05 -07:00
spl-build.m4	Add interface for file hole punching.	2012-10-04 16:22:07 -07:00
spl-meta.m4	Public Release Prep	2010-05-17 15:18:00 -07:00
tgz.am	Don't build packages that haven't been selected.	2012-07-26 14:54:32 -07:00