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xfs: Introduce XFS_IOC_ZERO_RANGE 

XFS_IOC_ZERO_RANGE is the equivalent of an atomic XFS_IOC_UNRESVSP/
XFS_IOC_RESVSP call pair. It enabled ranges of written data to be
turned into zeroes without requiring IO or having to free and
reallocate the extents in the range given as would occur if we had
to punch and then preallocate them separately.  This enables
applications to zero parts of files very quickly without changing
the layout of the files in any way.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-08-24 12:02:11 +10:00 committed by Alex Elder
parent 3ae4c9deb3
commit 4472235205
6 changed files with 27 additions and 9 deletions
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3
fs/xfs/linux-2.6/xfs_ioctl.c
View File

@ -1301,7 +1301,8 @@ xfs_file_ioctl(
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP64:
case XFS_IOC_RESVSP64:
case XFS_IOC_UNRESVSP64: {
case XFS_IOC_UNRESVSP64:
case XFS_IOC_ZERO_RANGE: {
xfs_flock64_t bf;
if (copy_from_user(&bf, arg, sizeof(bf)))

1
fs/xfs/linux-2.6/xfs_ioctl32.c
View File

@ -574,6 +574,7 @@ xfs_file_compat_ioctl(
case XFS_IOC_FSGEOMETRY_V1:
case XFS_IOC_FSGROWFSDATA:
case XFS_IOC_FSGROWFSRT:
case XFS_IOC_ZERO_RANGE:
return xfs_file_ioctl(filp, cmd, p);
#else
case XFS_IOC_ALLOCSP_32:

12
fs/xfs/xfs_bmap.c
View File

@ -4744,8 +4744,12 @@ xfs_bmapi(
* Check if writing previously allocated but
* unwritten extents.
*/
if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
if (wr &&
((mval->br_state == XFS_EXT_UNWRITTEN &&
((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) ||
(mval->br_state == XFS_EXT_NORM &&
((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT)) ==
(XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT))))) {
/*
* Modify (by adding) the state flag, if writing.
*/
@ -4757,7 +4761,9 @@ xfs_bmapi(
*firstblock;
cur->bc_private.b.flist = flist;
}
mval->br_state = XFS_EXT_NORM;
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
? XFS_EXT_NORM
: XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
firstblock, flist, &tmp_logflags,
whichfork, (flags & XFS_BMAPI_RSVBLOCKS));

9
fs/xfs/xfs_bmap.h
View File

@ -74,9 +74,12 @@ typedef struct xfs_bmap_free
#define XFS_BMAPI_IGSTATE 0x080 /* Ignore state - */
/* combine contig. space */
#define XFS_BMAPI_CONTIG 0x100 /* must allocate only one extent */
#define XFS_BMAPI_CONVERT 0x200 /* unwritten extent conversion - */
/* need write cache flushing and no */
/* additional allocation alignments */
/*
* unwritten extent conversion - this needs write cache flushing and no additional
* allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
* from written to unwritten, otherwise convert from unwritten to written.
*/
#define XFS_BMAPI_CONVERT 0x200
#define XFS_BMAPI_FLAGS \
{ XFS_BMAPI_WRITE, "WRITE" }, \

1
fs/xfs/xfs_fs.h
View File

@ -448,6 +448,7 @@ typedef struct xfs_handle {
/* XFS_IOC_SETBIOSIZE ---- deprecated 46 */
/* XFS_IOC_GETBIOSIZE ---- deprecated 47 */
#define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap)
#define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64)
/*
* ioctl commands that replace IRIX syssgi()'s

10
fs/xfs/xfs_vnodeops.c
View File

@ -2272,7 +2272,7 @@ xfs_alloc_file_space(
count = len;
imapp = &imaps[0];
nimaps = 1;
bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0);
bmapi_flag = XFS_BMAPI_WRITE | alloc_type;
startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
allocatesize_fsb = XFS_B_TO_FSB(mp, count);
@ -2711,6 +2711,7 @@ xfs_change_file_space(
xfs_off_t llen;
xfs_trans_t *tp;
struct iattr iattr;
int prealloc_type;
if (!S_ISREG(ip->i_d.di_mode))
return XFS_ERROR(EINVAL);
@ -2753,12 +2754,17 @@ xfs_change_file_space(
* size to be changed.
*/
setprealloc = clrprealloc = 0;
prealloc_type = XFS_BMAPI_PREALLOC;
switch (cmd) {
case XFS_IOC_ZERO_RANGE:
prealloc_type |= XFS_BMAPI_CONVERT;
xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
/* FALLTHRU */
case XFS_IOC_RESVSP:
case XFS_IOC_RESVSP64:
error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
1, attr_flags);
prealloc_type, attr_flags);
if (error)
return error;
setprealloc = 1;