[PATCH 05/10 v7] sunrpc: Store cache_detail in seq_file's private, directly

Kinglong Mee
2015-07-11T12:49:33Z

Cleanup.

Just store cache_detail in seq_file's private,
an allocated handle is redundant.

v7, same as v6.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
---
net/sunrpc/cache.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 2928aff..edec603 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1270,18 +1270,13 @@ EXPORT_SYMBOL_GPL(qword_get);
* get a header, then pass each real item in the cache
*/

-struct handle {
- struct cache_detail *cd;
-};
-
static void *c_start(struct seq_file *m, loff_t *pos)
__acquires(cd->hash_lock)
{
loff_t n = *pos;
unsigned int hash, entry;
struct cache_head *ch;
- struct cache_detail *cd = ((struct handle*)m->private)->cd;
-
+ struct cache_detail *cd = m->private;

read_lock(&cd->hash_lock);
if (!n--)
@@ -1308,7 +1303,7 @@ static void *c_next(struct seq_file *m, void *p, loff_t *pos)
{
struct cache_head *ch = p;
int hash = (*pos >> 32);
- struct cache_detail *cd = ((struct handle*)m->private)->cd;
+ struct cache_detail *cd = m->private;

if (p == SEQ_START_TOKEN)
hash = 0;
@@ -1334,14 +1329,14 @@ static void *c_next(struct seq_file *m, void *p, loff_t *pos)
static void c_stop(struct seq_file *m, void *p)
__releases(cd->hash_lock)
{
- struct cache_detail *cd = ((struct handle*)m->private)->cd;
+ struct cache_detail *cd = m->private;
read_unlock(&cd->hash_lock);
}

static int c_show(struct seq_file *m, void *p)
{
struct cache_head *cp = p;
- struct cache_detail *cd = ((struct handle*)m->private)->cd;
+ struct cache_detail *cd = m->private;

if (p == SEQ_START_TOKEN)
return cd->cache_show(m, cd, NULL);
@@ -1373,24 +1368,27 @@ static const struct seq_operations cache_content_op = {
static int content_open(struct inode *inode, struct file *file,
struct cache_detail *cd)
{
- struct handle *han;
+ struct seq_file *seq;
+ int err;

if (!cd || !try_module_get(cd->owner))
return -EACCES;
- han = __seq_open_private(file, &cache_content_op, sizeof(*han));
- if (han == NULL) {
+
+ err = seq_open(file, &cache_content_op);
+ if (err) {
module_put(cd->owner);
- return -ENOMEM;
+ return err;
}

- han->cd = cd;
+ seq = file->private_data;
+ seq->private = cd;
return 0;
}

static int content_release(struct inode *inode, struct file *file,
struct cache_detail *cd)
{
- int ret = seq_release_private(inode, file);
+ int ret = seq_release(inode, file);
module_put(cd->owner);
return ret;
}
--
2.4.3