This function will be used in future patches and will aid in implementing
ranged fiemap queries
Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
---
io/fiemap.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/io/fiemap.c b/io/fiemap.c
index d1584aba7818..30c49112e089 100644
--- a/io/fiemap.c
+++ b/io/fiemap.c
@@ -193,6 +193,22 @@ calc_print_format(
}
}
+/* Use ssize so that we can return also an error code in case the ioctl fails */
+static ssize_t
+get_extent_count(int fd, __u64 startoffset, __u64 len)
+{
+ struct fiemap fiemap = { 0 } ;
+ fiemap.fm_start = startoffset;
+ fiemap.fm_length = len;
+ if (ioctl(fd, FS_IOC_FIEMAP, (unsigned long)&fiemap) < 0) {
+ fprintf(stderr, _("%s: Failed to query fiemap extent count.\n"),
+ progname);
+ return -1;
+ }
+
+ return fiemap.fm_mapped_extents;
+}
+
int
fiemap_f(
int argc,
--
2.7.4
--
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