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authorDavid Howells <dhowells@redhat.com>2015-02-25 11:53:57 +0000
committerDavid Howells <dhowells@redhat.com>2015-04-02 14:28:53 +0100
commit6515d1dbf424c5c3b94d44e9c7f581026e7fc0d3 (patch)
treef36db7b4a6e91ff358926ddfdb28fba8349620cf /fs/fscache
parent30ceec6284129662efc3a1e7675b2bd857a046fe (diff)
downloadlinux-6515d1dbf424c5c3b94d44e9c7f581026e7fc0d3.tar.bz2
FS-Cache: Handle a new operation submitted against a killed object
Reject new operations that are being submitted against an object if that object has failed its lookup or creation states or has been killed by the cache backend for some other reason, such as having been culled. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Steve Dickson <steved@redhat.com> Acked-by: Jeff Layton <jeff.layton@primarydata.com>
Diffstat (limited to 'fs/fscache')
-rw-r--r--fs/fscache/object.c2
-rw-r--r--fs/fscache/operation.c6
2 files changed, 8 insertions, 0 deletions
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 12bb468bf0ae..9b79fc9a1464 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -610,6 +610,8 @@ static const struct fscache_state *fscache_lookup_failure(struct fscache_object
object->cache->ops->lookup_complete(object);
fscache_stat_d(&fscache_n_cop_lookup_complete);
+ set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags);
+
cookie = object->cookie;
set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index dec6defe3be3..18658fffbba1 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -176,6 +176,9 @@ int fscache_submit_exclusive_op(struct fscache_object *object,
list_add_tail(&op->pend_link, &object->pending_ops);
fscache_stat(&fscache_n_op_pend);
ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
} else {
fscache_report_unexpected_submission(object, op, ostate);
op->state = FSCACHE_OP_ST_CANCELLED;
@@ -249,6 +252,9 @@ int fscache_submit_op(struct fscache_object *object,
list_add_tail(&op->pend_link, &object->pending_ops);
fscache_stat(&fscache_n_op_pend);
ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
} else {
fscache_report_unexpected_submission(object, op, ostate);
ASSERT(!fscache_object_is_active(object));