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| author |   Lukas Czerner <lczerner@redhat.com> | 2010-10-27 21:30:11 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2010-10-27 21:30:11 -0400 |
| commit | 367a51a339020ba4d9edb0ce0f21d65bd50b00c9 (patch) | |
| tree | 696cbb5ca3108cd0cf8a7c3f494947cc9a4179c7 /include | |
| parent | ext4: Use return value from sb_issue_discard() (diff) | |
| download | linux-dev-367a51a339020ba4d9edb0ce0f21d65bd50b00c9.tar.xz linux-dev-367a51a339020ba4d9edb0ce0f21d65bd50b00c9.zip | |
fs: Add FITRIM ioctl
Adds an filesystem independent ioctl to allow implementation of file
system batched discard support. I takes fstrim_range structure as an
argument. fstrim_range is definec in the include/fs.h and its
definition is as follows.
struct fstrim_range {
start;
len;
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.
It is also possible to specify NULL as an argument. In this case the
arguments will set itself as follows:
start = 0;
len = ULLONG_MAX;
minlen = 0;
So it will trim the whole file system at one run.
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>
Reviewed-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 63d069bd80b7..7008268e9b5a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -32,6 +32,12 @@ #define SEEK_END 2 /* seek relative to end of file */ #define SEEK_MAX SEEK_END +struct fstrim_range { + uint64_t start; + uint64_t len; + uint64_t minlen; +}; + /* And dynamically-tunable limits and defaults: */ struct files_stat_struct { int nr_files; /* read only */ @@ -316,6 +322,7 @@ struct inodes_stat_t { #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ #define FITHAW _IOWR('X', 120, int) /* Thaw */ +#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ #define FS_IOC_GETFLAGS _IOR('f', 1, long) #define FS_IOC_SETFLAGS _IOW('f', 2, long) @@ -1581,6 +1588,7 @@ struct super_operations { ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); #endif int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); + int (*trim_fs) (struct super_block *, struct fstrim_range *); }; /* |