diff options
Diffstat (limited to 'fs/fscache/cookie.c')
| -rw-r--r-- | fs/fscache/cookie.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index 6df3732cf1b4..cd42be646ed3 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -164,7 +164,7 @@ struct fscache_cookie *fscache_alloc_cookie( goto nomem; } - atomic_set(&cookie->usage, 1); + refcount_set(&cookie->ref, 1); atomic_set(&cookie->n_children, 0); cookie->debug_id = atomic_inc_return(&fscache_cookie_debug_id); @@ -225,7 +225,7 @@ struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *candidate) collision: if (test_and_set_bit(FSCACHE_COOKIE_ACQUIRED, &cursor->flags)) { - trace_fscache_cookie(cursor->debug_id, atomic_read(&cursor->usage), + trace_fscache_cookie(cursor->debug_id, refcount_read(&cursor->ref), fscache_cookie_collision); pr_err("Duplicate cookie detected\n"); fscache_print_cookie(cursor, 'O'); @@ -826,13 +826,12 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, BUG_ON(!radix_tree_empty(&cookie->stores)); if (cookie->parent) { - ASSERTCMP(atomic_read(&cookie->parent->usage), >, 0); + ASSERTCMP(refcount_read(&cookie->parent->ref), >, 0); ASSERTCMP(atomic_read(&cookie->parent->n_children), >, 0); atomic_dec(&cookie->parent->n_children); } /* Dispose of the netfs's link to the cookie */ - ASSERTCMP(atomic_read(&cookie->usage), >, 0); fscache_cookie_put(cookie, fscache_cookie_put_relinquish); _leave(""); @@ -862,18 +861,17 @@ void fscache_cookie_put(struct fscache_cookie *cookie, enum fscache_cookie_trace where) { struct fscache_cookie *parent; - int usage; + int ref; _enter("%x", cookie->debug_id); do { unsigned int cookie_debug_id = cookie->debug_id; - usage = atomic_dec_return(&cookie->usage); - trace_fscache_cookie(cookie_debug_id, usage, where); + bool zero = __refcount_dec_and_test(&cookie->ref, &ref); - if (usage > 0) + trace_fscache_cookie(cookie_debug_id, ref - 1, where); + if (!zero) return; - BUG_ON(usage < 0); parent = cookie->parent; fscache_unhash_cookie(cookie); @@ -887,6 +885,19 @@ void fscache_cookie_put(struct fscache_cookie *cookie, } /* + * Get a reference to a cookie. + */ +struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *cookie, + enum fscache_cookie_trace where) +{ + int ref; + + __refcount_inc(&cookie->ref, &ref); + trace_fscache_cookie(cookie->debug_id, ref + 1, where); + return cookie; +} + +/* * check the consistency between the netfs inode and the backing cache * * NOTE: it only serves no-index type @@ -1003,7 +1014,7 @@ static int fscache_cookies_seq_show(struct seq_file *m, void *v) "%08x %08x %5u %5u %3u %s %03lx %-16s %px", cookie->debug_id, cookie->parent ? cookie->parent->debug_id : 0, - atomic_read(&cookie->usage), + refcount_read(&cookie->ref), atomic_read(&cookie->n_children), atomic_read(&cookie->n_active), type, |