diff options
| author | Anand Avati <avati@redhat.com> | 2013-11-20 15:11:13 -0800 |
|---|---|---|
| committer | Anand Avati <avati@redhat.com> | 2013-11-21 13:11:18 -0800 |
| commit | fee08b2cbf8c118d33dea745e0ae3033b36969da (patch) | |
| tree | e7f42b21457ba1fe63ad994559dba0d799fb4168 /libglusterfs | |
| parent | 544dee895a43ec9bb98fc8ace3d124d44bb617f2 (diff) | |
fuse: revalidate group id cache on uid/gid change detection
- Remember the uid and gid of the pid at the time of caching
the group id list.
- Next time when referring to the cache confirm that uid and gid
of that pid has not changed since. If it has, treat it like
a timeout/cache miss.
- Solves group id caching issue caused when Samba runs on gluster
FUSE mount and changes the uid/gid on a per syscall basis.
Change-Id: I3382b037ff0b6d5eaaa36d9c898232543475aeda
BUG: 1032438
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/6320
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Diffstat (limited to 'libglusterfs')
| -rw-r--r-- | libglusterfs/src/gidcache.c | 16 | ||||
| -rw-r--r-- | libglusterfs/src/gidcache.h | 4 |
2 files changed, 18 insertions, 2 deletions
diff --git a/libglusterfs/src/gidcache.c b/libglusterfs/src/gidcache.c index c5bdda92596..f2d98abefc3 100644 --- a/libglusterfs/src/gidcache.c +++ b/libglusterfs/src/gidcache.c @@ -54,7 +54,8 @@ int gid_cache_reconf(gid_cache_t *cache, uint32_t timeout) * an additional allocation and memory copy. The caller should copy the data and * release (unlock) the cache as soon as possible. */ -const gid_list_t *gid_cache_lookup(gid_cache_t *cache, uint64_t id) +const gid_list_t *gid_cache_lookup(gid_cache_t *cache, uint64_t id, + uint64_t uid, uint64_t gid) { int bucket; int i; @@ -72,6 +73,17 @@ const gid_list_t *gid_cache_lookup(gid_cache_t *cache, uint64_t id) continue; /* + @uid and @gid reflect the latest UID/GID of the + process performing the syscall (taken from frame->root). + + If the UID and GID has changed for the PID since the + time we cached it, we should treat the cache as having + stale values and query them freshly. + */ + if (agl->gl_uid != uid || agl->gl_gid != gid) + break; + + /* * We don't put new entries in the cache when expiration=0, but * there might be entries still in there if expiration was * changed very recently. Writing the check this way ensures @@ -182,6 +194,8 @@ int gid_cache_add(gid_cache_t *cache, gid_list_t *gl) } agl->gl_id = gl->gl_id; + agl->gl_uid = gl->gl_uid; + agl->gl_gid = gl->gl_gid; agl->gl_count = gl->gl_count; agl->gl_list = gl->gl_list; agl->gl_deadline = now + cache->gc_max_age; diff --git a/libglusterfs/src/gidcache.h b/libglusterfs/src/gidcache.h index 9379f8e8b01..886721e719f 100644 --- a/libglusterfs/src/gidcache.h +++ b/libglusterfs/src/gidcache.h @@ -32,6 +32,8 @@ typedef struct { uint64_t gl_id; + uint64_t gl_uid; + uint64_t gl_gid; int gl_count; gid_t *gl_list; time_t gl_deadline; @@ -46,7 +48,7 @@ typedef struct { int gid_cache_init(gid_cache_t *, uint32_t); int gid_cache_reconf(gid_cache_t *, uint32_t); -const gid_list_t *gid_cache_lookup(gid_cache_t *, uint64_t); +const gid_list_t *gid_cache_lookup(gid_cache_t *, uint64_t, uint64_t, uint64_t); void gid_cache_release(gid_cache_t *, const gid_list_t *); int gid_cache_add(gid_cache_t *, gid_list_t *); |