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[PATCH v8 4/11] xfsprogs: xfs_io: add finsert command for insert range

To: david@xxxxxxxxxxxxx, tytso@xxxxxxx
Subject: [PATCH v8 4/11] xfsprogs: xfs_io: add finsert command for insert range
From: Namjae Jeon <linkinjeon@xxxxxxxxx>
Date: Wed, 14 Jan 2015 01:05:19 +0900
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, a.sangwan@xxxxxxxxxxx, bfoster@xxxxxxxxxx, Namjae Jeon <linkinjeon@xxxxxxxxx>, Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
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From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>

Add finsert command for fallocate FALLOC_FL_INSERT_RANGE flag.

Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
---
 io/prealloc.c |   39 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/io/prealloc.c b/io/prealloc.c
index aba6b44..4ab3d8c 100644
--- a/io/prealloc.c
+++ b/io/prealloc.c
@@ -37,6 +37,10 @@
 #define FALLOC_FL_ZERO_RANGE 0x10
 #endif
 
+#ifndef FALLOC_FL_INSERT_RANGE
+#define FALLOC_FL_INSERT_RANGE 0x20
+#endif
+
 static cmdinfo_t allocsp_cmd;
 static cmdinfo_t freesp_cmd;
 static cmdinfo_t resvsp_cmd;
@@ -46,6 +50,7 @@ static cmdinfo_t zero_cmd;
 static cmdinfo_t falloc_cmd;
 static cmdinfo_t fpunch_cmd;
 static cmdinfo_t fcollapse_cmd;
+static cmdinfo_t finsert_cmd;
 static cmdinfo_t fzero_cmd;
 #endif
 
@@ -169,11 +174,14 @@ fallocate_f(
        int             mode = 0;
        int             c;
 
-       while ((c = getopt(argc, argv, "ckp")) != EOF) {
+       while ((c = getopt(argc, argv, "cikp")) != EOF) {
                switch (c) {
                case 'c':
                        mode = FALLOC_FL_COLLAPSE_RANGE;
                        break;
+               case 'i':
+                       mode = FALLOC_FL_INSERT_RANGE;
+                       break;
                case 'k':
                        mode = FALLOC_FL_KEEP_SIZE;
                        break;
@@ -237,6 +245,25 @@ fcollapse_f(
 }
 
 static int
+finsert_f(
+       int             argc,
+       char            **argv)
+{
+       xfs_flock64_t   segment;
+       int             mode = FALLOC_FL_INSERT_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;
+}
+
+static int
 fzero_f(
        int             argc,
        char            **argv)
@@ -345,6 +372,16 @@ prealloc_init(void)
        _("de-allocates space and eliminates the hole by shifting extents");
        add_command(&fcollapse_cmd);
 
+       finsert_cmd.name = "finsert";
+       finsert_cmd.cfunc = finsert_f;
+       finsert_cmd.argmin = 2;
+       finsert_cmd.argmax = 2;
+       finsert_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+       finsert_cmd.args = _("off len");
+       finsert_cmd.oneline =
+       _("creates new space for writing within file by shifting extents");
+       add_command(&finsert_cmd);
+
        fzero_cmd.name = "fzero";
        fzero_cmd.cfunc = fzero_f;
        fzero_cmd.argmin = 2;
-- 
1.7.9.5

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