Nfsd has implement a site of seq_operations functions as sunrpc's cache. Just exports sunrpc's codes, and remove nfsd's redundant codes. v7, same as v6 Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx> --- fs/nfsd/export.c | 73 ++------------------------------------------ include/linux/sunrpc/cache.h | 5 +++ net/sunrpc/cache.c | 15 +++++---- 3 files changed, 17 insertions(+), 76 deletions(-) diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index f79521a..b4d84b5 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -1075,73 +1075,6 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) return rv; } -/* Iterator */ - -static void *e_start(struct seq_file *m, loff_t *pos) - __acquires(((struct cache_detail *)m->private)->hash_lock) -{ - loff_t n = *pos; - unsigned hash, export; - struct cache_head *ch; - struct cache_detail *cd = m->private; - struct cache_head **export_table = cd->hash_table; - - read_lock(&cd->hash_lock); - if (!n--) - return SEQ_START_TOKEN; - hash = n >> 32; - export = n & ((1LL<<32) - 1); - - - for (ch=export_table[hash]; ch; ch=ch->next) - if (!export--) - return ch; - n &= ~((1LL<<32) - 1); - do { - hash++; - n += 1LL<<32; - } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); - if (hash >= EXPORT_HASHMAX) - return NULL; - *pos = n+1; - return export_table[hash]; -} - -static void *e_next(struct seq_file *m, void *p, loff_t *pos) -{ - struct cache_head *ch = p; - int hash = (*pos >> 32); - struct cache_detail *cd = m->private; - struct cache_head **export_table = cd->hash_table; - - if (p == SEQ_START_TOKEN) - hash = 0; - else if (ch->next == NULL) { - hash++; - *pos += 1LL<<32; - } else { - ++*pos; - return ch->next; - } - *pos &= ~((1LL<<32) - 1); - while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { - hash++; - *pos += 1LL<<32; - } - if (hash >= EXPORT_HASHMAX) - return NULL; - ++*pos; - return export_table[hash]; -} - -static void e_stop(struct seq_file *m, void *p) - __releases(((struct cache_detail *)m->private)->hash_lock) -{ - struct cache_detail *cd = m->private; - - read_unlock(&cd->hash_lock); -} - static struct flags { int flag; char *name[2]; @@ -1270,9 +1203,9 @@ static int e_show(struct seq_file *m, void *p) } const struct seq_operations nfs_exports_op = { - .start = e_start, - .next = e_next, - .stop = e_stop, + .start = cache_seq_start, + .next = cache_seq_next, + .stop = cache_seq_stop, .show = e_show, }; diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 437ddb6..04ee5a2 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -224,6 +224,11 @@ extern int sunrpc_cache_register_pipefs(struct dentry *parent, const char *, umode_t, struct cache_detail *); extern void sunrpc_cache_unregister_pipefs(struct cache_detail *); +/* Must store cache_detail in seq_file->private if using next three functions */ +extern void *cache_seq_start(struct seq_file *file, loff_t *pos); +extern void *cache_seq_next(struct seq_file *file, void *p, loff_t *pos); +extern void cache_seq_stop(struct seq_file *file, void *p); + extern void qword_add(char **bpp, int *lp, char *str); extern void qword_addhex(char **bpp, int *lp, char *buf, int blen); extern int qword_get(char **bpp, char *dest, int bufsize); diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index edec603..673c2fa 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1270,7 +1270,7 @@ EXPORT_SYMBOL_GPL(qword_get); * get a header, then pass each real item in the cache */ -static void *c_start(struct seq_file *m, loff_t *pos) +void *cache_seq_start(struct seq_file *m, loff_t *pos) __acquires(cd->hash_lock) { loff_t n = *pos; @@ -1298,8 +1298,9 @@ static void *c_start(struct seq_file *m, loff_t *pos) *pos = n+1; return cd->hash_table[hash]; } +EXPORT_SYMBOL_GPL(cache_seq_start); -static void *c_next(struct seq_file *m, void *p, loff_t *pos) +void *cache_seq_next(struct seq_file *m, void *p, loff_t *pos) { struct cache_head *ch = p; int hash = (*pos >> 32); @@ -1325,13 +1326,15 @@ static void *c_next(struct seq_file *m, void *p, loff_t *pos) ++*pos; return cd->hash_table[hash]; } +EXPORT_SYMBOL_GPL(cache_seq_next); -static void c_stop(struct seq_file *m, void *p) +void cache_seq_stop(struct seq_file *m, void *p) __releases(cd->hash_lock) { struct cache_detail *cd = m->private; read_unlock(&cd->hash_lock); } +EXPORT_SYMBOL_GPL(cache_seq_stop); static int c_show(struct seq_file *m, void *p) { @@ -1359,9 +1362,9 @@ static int c_show(struct seq_file *m, void *p) } static const struct seq_operations cache_content_op = { - .start = c_start, - .next = c_next, - .stop = c_stop, + .start = cache_seq_start, + .next = cache_seq_next, + .stop = cache_seq_stop, .show = c_show, }; -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html