linux/fs/ext4
Lukas Czerner e681c047e4 ext4: Add EXT4_IOC_TRIM ioctl to handle batched discard
Filesystem independent ioctl was rejected as not common enough to be in
core vfs ioctl. Since we still need to access to this functionality this
commit adds ext4 specific ioctl EXT4_IOC_TRIM to dispatch
ext4_trim_fs().

It takes fstrim_range structure as an argument. fstrim_range is definec in
the include/linux/fs.h and its definition is as follows.

struct fstrim_range {
	__u64 start;
	__u64 len;
	__u64 minlen;
}

start	- first Byte to trim
len	- number of Bytes to trim from start
minlen	- minimum extent length to trim, free extents shorter than this
  number of Bytes will be ignored. This will be rounded up to fs
  block size.

After the FITRIM is done, the number of actually discarded Bytes is stored
in fstrim_range.len to give the user better insight on how much storage
space has been really released for wear-leveling.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-11-19 21:47:07 -05:00
..
acl.c ext4: update ctime when changing the file's permission by setfacl 2010-06-15 12:19:59 -04:00
acl.h ext[234]: move over to 'check_acl' permission model 2009-09-08 11:09:04 -07:00
balloc.c ext4: rename mark_bitmap_end() to ext4_mark_bitmap_end() 2010-10-27 21:30:15 -04:00
bitmap.c ext4: Change unsigned long to unsigned int 2008-11-05 00:14:04 -05:00
block_validity.c ext4: rename {exit,init}_ext4_*() to ext4_{exit,init}_*() 2010-10-27 21:30:14 -04:00
dir.c ext4: improve llseek error handling for overly large seek offsets 2010-10-27 21:30:06 -04:00
ext4_extents.h ext4: rename {ext,idx}_pblock and inline small extent functions 2010-10-27 21:30:14 -04:00
ext4_jbd2.c ext4: Pass line numbers to ext4_error() and friends 2010-07-27 11:56:40 -04:00
ext4_jbd2.h ext4: Pass line numbers to ext4_error() and friends 2010-07-27 11:56:40 -04:00
ext4.h ext4: fix potential race when freeing ext4_io_page structures 2010-11-08 13:45:33 -05:00
extents.c Merge branch 'next' into upstream-merge 2010-10-27 23:44:47 -04:00
file.c ext4: improve llseek error handling for overly large seek offsets 2010-10-27 21:30:06 -04:00
fsync.c Merge branch 'next' into upstream-merge 2010-10-27 23:44:47 -04:00
hash.c ext4: Add support for non-native signed/unsigned htree hash algorithms 2008-10-28 13:21:44 -04:00
ialloc.c Merge branch 'next' into upstream-merge 2010-10-27 23:44:47 -04:00
inode.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2010-11-08 11:54:53 -08:00
ioctl.c ext4: Add EXT4_IOC_TRIM ioctl to handle batched discard 2010-11-19 21:47:07 -05:00
Kconfig ext4: Don't ask about supporting ext2/3 in ext4 if ext4 is not configured 2009-12-21 10:54:09 -05:00
Makefile ext4: use bio layer instead of buffer layer in mpage_da_submit_io 2010-10-27 21:30:10 -04:00
mballoc.c ext4: Don't call sb_issue_discard() in ext4_free_blocks() 2010-11-08 13:49:33 -05:00
mballoc.h ext4: consolidate in_range() definitions 2010-03-03 23:55:01 -05:00
migrate.c ext4: rename {ext,idx}_pblock and inline small extent functions 2010-10-27 21:30:14 -04:00
move_extent.c ext4: rename {ext,idx}_pblock and inline small extent functions 2010-10-27 21:30:14 -04:00
namei.c Merge branch 'next' into upstream-merge 2010-10-27 23:44:47 -04:00
page-io.c ext4: fix setting random pages PageUptodate 2010-11-17 21:46:06 -05:00
resize.c Merge branch 'next' into upstream-merge 2010-10-27 23:44:47 -04:00
super.c fs: Do not dispatch FITRIM through separate super_operation 2010-11-19 21:18:35 -05:00
symlink.c ext4: symlink must be handled via filesystem specific operation 2010-05-16 02:00:00 -04:00
xattr_security.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr_trusted.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr_user.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr.c ext4: rename {exit,init}_ext4_*() to ext4_{exit,init}_*() 2010-10-27 21:30:14 -04:00
xattr.h ext4: fix compile with CONFIG_EXT4_FS_XATTR disabled 2010-10-28 09:29:17 -07:00