diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2016-08-30 16:20:55 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-07 15:23:47 +0200 |
| commit | 7eb0153fc42d98d301a5ca946ed31366cd33526f (patch) | |
| tree | 063b62a21747ce447b286d54ee6dcd8ad8805f6f /kernel/tsacct.c | |
| parent | bceea9fee1c606f567a156b7dee9c9564a2f5c19 (diff) | |
dm log writes: fix bug with too large bios
commit 7efb367320f56fc4d549875b6f3a6940018ef2e5 upstream.
bio_alloc() can allocate a bio with at most BIO_MAX_PAGES (256) vector
entries. However, the incoming bio may have more vector entries if it
was allocated by other means. For example, bcache submits bios with
more than BIO_MAX_PAGES entries. This results in bio_alloc() failure.
To avoid the failure, change the code so that it allocates bio with at
most BIO_MAX_PAGES entries. If the incoming bio has more entries,
bio_add_page() will fail and a new bio will be allocated - the code that
handles bio_add_page() failure already exists in the dm-log-writes
target.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/tsacct.c')
0 files changed, 0 insertions, 0 deletions