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MDEV-25734 mbstream breaks page compression on XFS

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try harder to punch holes on xfs, don't rely on its heuristics to do
the right thing
This commit is contained in:
Sergei Golubchik 2023-10-13 20:06:41 +02:00
parent 073a088f31
commit e9b38f684f
1 changed files with 16 additions and 3 deletions
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19
extra/mariabackup/ds_local.cc
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@ -28,6 +28,10 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
#include <winioctl.h>
#endif
#ifdef HAVE_FALLOC_PUNCH_HOLE_AND_KEEP_SIZE
#include <linux/falloc.h>
#endif
typedef struct {
File fd;
my_bool init_ibd_done;
@ -160,9 +164,18 @@ static int write_compressed(File fd, uchar *data, size_t len, size_t pagesize)
if (datasize < n_bytes) {
/* This punches a "hole" in the file. */
size_t hole_bytes = n_bytes - datasize;
if (my_seek(fd, hole_bytes, MY_SEEK_CUR, MYF(MY_WME | MY_NABP))
== MY_FILEPOS_ERROR)
return 1;
my_off_t off = my_seek(fd, hole_bytes, MY_SEEK_CUR, MYF(MY_WME | MY_NABP));
if (off == MY_FILEPOS_ERROR)
return 1;
#ifdef HAVE_FALLOC_PUNCH_HOLE_AND_KEEP_SIZE
/* punch holes harder for filesystems (like XFS) that
heuristically decide whether leave a hole after the
above or not based on the current access pattern
(which is sequential write and not at all typical for
what InnoDB will be doing with the file later */
fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
off - hole_bytes, hole_bytes);
#endif
}
written += n_bytes;
ptr += n_bytes;