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| author | Josh Durgin <josh.durgin@inktank.com> | 2013-09-05 04:57:31 +0400 |
|---|---|---|
| committer | Josh Durgin <josh.durgin@inktank.com> | 2013-09-09 22:16:44 +0400 |
| commit | da6a6b63978d45f9ae582d1f362f182012da3a22 (patch) | |
| tree | 536126934cdf348b186d1505c047fb967f71f812 /drivers/block/rbd.c | |
| parent | efadc98aab674153709cc357ba565f04e3164fcd (diff) | |
| download | linux-da6a6b63978d45f9ae582d1f362f182012da3a22.tar.xz | |
rbd: fix error handling from rbd_snap_name()
rbd_snap_name() calls rbd_dev_v{1,2}_snap_name() depending on the
format of the image. The format 1 version returns NULL on error, which
is handled by the caller. The format 2 version returns an ERR_PTR,
which the caller of rbd_snap_name() does not expect.
Fortunately this is unlikely to occur in practice because
rbd_snap_id_by_name() is called before rbd_snap_name(). This would hit
similar errors to rbd_snap_name() (like the snapshot not existing) and
return early, so rbd_snap_name() would not hit an error unless the
snapshot was removed between the two calls or memory was exhausted.
Use an ERR_PTR in rbd_dev_v1_snap_name() so that the specific error
can be propagated, and it is consistent with rbd_dev_v2_snap_name().
Handle the ERR_PTR in the only rbd_snap_name() caller.
Suggested-by: Alex Elder <alex.elder@linaro.org>
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Diffstat (limited to 'drivers/block/rbd.c')
| -rw-r--r-- | drivers/block/rbd.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 626a7136fb2f..2f00778e1024 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -927,12 +927,14 @@ static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u64 snap_id) { u32 which; + const char *snap_name; which = rbd_dev_snap_index(rbd_dev, snap_id); if (which == BAD_SNAP_INDEX) - return NULL; + return ERR_PTR(-ENOENT); - return _rbd_dev_v1_snap_name(rbd_dev, which); + snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); + return snap_name ? snap_name : ERR_PTR(-ENOMEM); } static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) @@ -4163,8 +4165,8 @@ static int rbd_dev_spec_update(struct rbd_device *rbd_dev) /* Look up the snapshot name, and make a copy */ snap_name = rbd_snap_name(rbd_dev, spec->snap_id); - if (!snap_name) { - ret = -ENOMEM; + if (IS_ERR(snap_name)) { + ret = PTR_ERR(snap_name); goto out_err; } |