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| author | David Howells | 2012-12-20 22:52:35 +0100 |
|---|---|---|
| committer | David Howells | 2012-12-20 22:58:25 +0100 |
| commit | ef46ed888efb1e8da33be5d33c9b54476289a43b (patch) | |
| tree | d538dc01a075162f95da416da1fb5d6fd676445a /fs/fscache/cookie.c | |
| parent | CacheFiles: Make some debugging statements conditional (diff) | |
| download | kernel-qcow2-linux-ef46ed888efb1e8da33be5d33c9b54476289a43b.tar.gz kernel-qcow2-linux-ef46ed888efb1e8da33be5d33c9b54476289a43b.tar.xz kernel-qcow2-linux-ef46ed888efb1e8da33be5d33c9b54476289a43b.zip | |
FS-Cache: Make cookie relinquishment wait for outstanding reads
Make fscache_relinquish_cookie() log a warning and wait if there are any
outstanding reads left on the cookie it was given.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/fscache/cookie.c')
| -rw-r--r-- | fs/fscache/cookie.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index 0666996adf80..66be9eccede0 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -442,22 +442,32 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire) event = retire ? FSCACHE_OBJECT_EV_RETIRE : FSCACHE_OBJECT_EV_RELEASE; +try_again: spin_lock(&cookie->lock); /* break links with all the active objects */ while (!hlist_empty(&cookie->backing_objects)) { + int n_reads; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); _debug("RELEASE OBJ%x", object->debug_id); - if (atomic_read(&object->n_reads)) { + set_bit(FSCACHE_COOKIE_WAITING_ON_READS, &cookie->flags); + n_reads = atomic_read(&object->n_reads); + if (n_reads) { + int n_ops = object->n_ops; + int n_in_progress = object->n_in_progress; spin_unlock(&cookie->lock); printk(KERN_ERR "FS-Cache:" - " Cookie '%s' still has %d outstanding reads\n", - cookie->def->name, atomic_read(&object->n_reads)); - BUG(); + " Cookie '%s' still has %d outstanding reads (%d,%d)\n", + cookie->def->name, + n_reads, n_ops, n_in_progress); + wait_on_bit(&cookie->flags, FSCACHE_COOKIE_WAITING_ON_READS, + fscache_wait_bit, TASK_UNINTERRUPTIBLE); + printk("Wait finished\n"); + goto try_again; } /* detach each cache object from the object cookie */ |