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punch-alternating: use the block size reported by the fs for punching

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When we're trying to punch alternating blocks out of a file, use the
bsize reported by fstatfs so that we can punch out single blocks.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong
2016-02-19 10:51:17 +11:00
committed by Dave Chinner
parent 004197958e
commit f9ff240882
1 changed files with 6 additions and 1 deletions
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src/punch-alternating.c
+6 -1
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@@ -14,6 +14,7 @@
int main(int argc, char *argv[])
{
struct stat s;
struct statfs sf;
off_t offset;
int fd;
blksize_t blksz;
@@ -35,8 +36,12 @@ int main(int argc, char *argv[])
if (error)
goto err;
error = fstatfs(fd, &sf);
if (error)
goto err;
sz = s.st_size;
blksz = s.st_blksize;
blksz = sf.f_bsize;
mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
for (offset = 0; offset < sz; offset += blksz * 2) {