diff options
| author | Etienne Dechamps <[email protected]> | 2012-09-03 14:56:26 +0200 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2012-10-04 16:22:07 -0700 |
| commit | bbdc6ae49518a4be7230ab673370e9231e2f72e7 (patch) | |
| tree | f1e0522a75b9272b1da8a6f5382e0a3b9fbdffe4 /include/sys | |
| parent | a6c6839a88b7dc344f3cd8e875a01802b34645cd (diff) | |
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 <[email protected]>
Closes #168
Diffstat (limited to 'include/sys')
| -rw-r--r-- | include/sys/vnode.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/sys/vnode.h b/include/sys/vnode.h index 03462bd70..99614d55b 100644 --- a/include/sys/vnode.h +++ b/include/sys/vnode.h @@ -66,6 +66,9 @@ #define FNODSYNC 0x10000 /* fsync pseudo flag */ #define FNOFOLLOW 0x20000 /* don't follow symlinks */ +#define F_FREESP 11 /* Free file space */ + + /* * The vnode AT_ flags are mapped to the Linux ATTR_* flags. * This allows them to be used safely with an iattr structure. @@ -185,6 +188,8 @@ extern int vn_remove(const char *path, uio_seg_t seg, int flags); extern int vn_rename(const char *path1, const char *path2, int x1); extern int vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4); extern int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4); +extern int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag, + offset_t offset, void *x6, void *x7); extern file_t *vn_getf(int fd); extern void vn_releasef(int fd); extern int vn_set_pwd(const char *filename); @@ -197,6 +202,7 @@ void spl_vn_fini(void); #define VOP_SEEK vn_seek #define VOP_GETATTR vn_getattr #define VOP_FSYNC vn_fsync +#define VOP_SPACE vn_space #define VOP_PUTPAGE(vp, o, s, f, x1, x2) ((void)0) #define vn_is_readonly(vp) 0 #define getf vn_getf |