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Subject[PATCH v4 4/10] xfsprog: xfsio: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate
Date
From: Namjae Jeon <namjae.jeon@samsung.com>

Add support FALLOC_FL_COLLAPSE_RANGE for fallocate.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
---
io/prealloc.c | 41 +++++++++++++++++++++++++++++++++++++++--
man/man8/xfs_io.8 | 6 ++++++
2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/io/prealloc.c b/io/prealloc.c
index 8380646..d697f82 100644
--- a/io/prealloc.c
+++ b/io/prealloc.c
@@ -29,6 +29,10 @@
#define FALLOC_FL_PUNCH_HOLE 0x02
#endif

+#ifndef FALLOC_FL_COLLAPSE_RANGE
+#define FALLOC_FL_COLLAPSE_RANGE 0x08
+#endif
+
static cmdinfo_t allocsp_cmd;
static cmdinfo_t freesp_cmd;
static cmdinfo_t resvsp_cmd;
@@ -37,6 +41,7 @@ static cmdinfo_t zero_cmd;
#if defined(HAVE_FALLOCATE)
static cmdinfo_t falloc_cmd;
static cmdinfo_t fpunch_cmd;
+static cmdinfo_t fcollapse_cmd;
#endif

static int
@@ -159,8 +164,11 @@ fallocate_f(
int mode = 0;
int c;

- while ((c = getopt(argc, argv, "kp")) != EOF) {
+ while ((c = getopt(argc, argv, "ckp")) != EOF) {
switch (c) {
+ case 'c':
+ mode = FALLOC_FL_COLLAPSE_RANGE;
+ break;
case 'k':
mode = FALLOC_FL_KEEP_SIZE;
break;
@@ -203,6 +211,25 @@ fpunch_f(
}
return 0;
}
+
+static int
+fcollapse_f(
+ int argc,
+ char **argv)
+{
+ xfs_flock64_t segment;
+ int mode = FALLOC_FL_COLLAPSE_RANGE;
+
+ if (!offset_length(argv[1], argv[2], &segment))
+ return 0;
+
+ if (fallocate(file->fd, mode,
+ segment.l_start, segment.l_len)) {
+ perror("fallocate");
+ return 0;
+ }
+ return 0;
+}
#endif /* HAVE_FALLOCATE */

void
@@ -263,7 +290,7 @@ prealloc_init(void)
falloc_cmd.argmin = 2;
falloc_cmd.argmax = -1;
falloc_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
- falloc_cmd.args = _("[-k] [-p] off len");
+ falloc_cmd.args = _("[-c] [-k] [-p] off len");
falloc_cmd.oneline =
_("allocates space associated with part of a file via fallocate");
add_command(&falloc_cmd);
@@ -277,5 +304,15 @@ prealloc_init(void)
fpunch_cmd.oneline =
_("de-allocates space assocated with part of a file via fallocate");
add_command(&fpunch_cmd);
+
+ fcollapse_cmd.name = "fcollapse";
+ fcollapse_cmd.cfunc = fcollapse_f;
+ fcollapse_cmd.argmin = 2;
+ fcollapse_cmd.argmax = 2;
+ fcollapse_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+ fcollapse_cmd.args = _("off len");
+ fcollapse_cmd.oneline =
+ _("de-allocates space and eliminates the hole by shifting extents");
+ add_command(&fcollapse_cmd);
#endif /* HAVE_FALLOCATE */
}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 767b50e..9543b20 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -380,6 +380,12 @@ will set the FALLOC_FL_KEEP_SIZE flag as described in
.PD
.RE
.TP
+.BI fcollapse " offset length"
+Call fallocate with FALLOC_FL_COLLAPSE_RANGE flag as described in the
+.BR fallocate (2)
+manual page to de-allocates blocks and eliminates the hole created in this process
+by shifting data blocks into the hole.
+.TP
.BI fpunch " offset length"
Punches (de-allocates) blocks in the file by calling fallocate with
the FALLOC_FL_PUNCH_HOLE flag as described in the
--
1.7.9.5


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