[PATCH V4 2/6] erofs: code clean up for fscache
From: Jia Zhu
Date: Thu Sep 15 2022 - 08:43:03 EST
Some cleanups. No logic changes.
Suggested-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Signed-off-by: Jia Zhu <zhujia.zj@xxxxxxxxxxxxx>
---
fs/erofs/fscache.c | 36 ++++++++++++++++++------------------
fs/erofs/internal.h | 17 ++++++++---------
fs/erofs/super.c | 22 +++++++++-------------
3 files changed, 35 insertions(+), 40 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 8e01d89c3319..d72e2a7ea6ab 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -417,9 +417,8 @@ const struct address_space_operations erofs_fscache_access_aops = {
.readahead = erofs_fscache_readahead,
};
-int erofs_fscache_register_cookie(struct super_block *sb,
- struct erofs_fscache **fscache,
- char *name, bool need_inode)
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, bool need_inode)
{
struct fscache_volume *volume = EROFS_SB(sb)->volume;
struct erofs_fscache *ctx;
@@ -428,7 +427,7 @@ int erofs_fscache_register_cookie(struct super_block *sb,
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE,
name, strlen(name), NULL, 0, 0);
@@ -458,40 +457,32 @@ int erofs_fscache_register_cookie(struct super_block *sb,
ctx->inode = inode;
}
- *fscache = ctx;
- return 0;
+ return ctx;
err_cookie:
fscache_unuse_cookie(ctx->cookie, NULL, NULL);
fscache_relinquish_cookie(ctx->cookie, false);
- ctx->cookie = NULL;
err:
kfree(ctx);
- return ret;
+ return ERR_PTR(ret);
}
-void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)
+void erofs_fscache_unregister_cookie(struct erofs_fscache *ctx)
{
- struct erofs_fscache *ctx = *fscache;
-
if (!ctx)
return;
fscache_unuse_cookie(ctx->cookie, NULL, NULL);
fscache_relinquish_cookie(ctx->cookie, false);
- ctx->cookie = NULL;
-
iput(ctx->inode);
- ctx->inode = NULL;
-
kfree(ctx);
- *fscache = NULL;
}
int erofs_fscache_register_fs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct fscache_volume *volume;
+ struct erofs_fscache *fscache;
char *name;
int ret = 0;
@@ -502,12 +493,19 @@ int erofs_fscache_register_fs(struct super_block *sb)
volume = fscache_acquire_volume(name, NULL, NULL, 0);
if (IS_ERR_OR_NULL(volume)) {
erofs_err(sb, "failed to register volume for %s", name);
- ret = volume ? PTR_ERR(volume) : -EOPNOTSUPP;
- volume = NULL;
+ kfree(name);
+ return volume ? PTR_ERR(volume) : -EOPNOTSUPP;
}
sbi->volume = volume;
kfree(name);
+
+ fscache = erofs_fscache_register_cookie(sb, sbi->opt.fsid, true);
+ /* acquired volume will be relinquished in kill_sb() */
+ if (IS_ERR(fscache))
+ return PTR_ERR(fscache);
+
+ sbi->s_fscache = fscache;
return ret;
}
@@ -515,6 +513,8 @@ void erofs_fscache_unregister_fs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ erofs_fscache_unregister_cookie(sbi->s_fscache);
fscache_relinquish_volume(sbi->volume, NULL, false);
+ sbi->s_fscache = NULL;
sbi->volume = NULL;
}
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index cfee49d33b95..aa71eb65e965 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -610,27 +610,26 @@ static inline int z_erofs_load_lzma_config(struct super_block *sb,
int erofs_fscache_register_fs(struct super_block *sb);
void erofs_fscache_unregister_fs(struct super_block *sb);
-int erofs_fscache_register_cookie(struct super_block *sb,
- struct erofs_fscache **fscache,
- char *name, bool need_inode);
-void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache);
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, bool need_inode);
+void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
extern const struct address_space_operations erofs_fscache_access_aops;
#else
static inline int erofs_fscache_register_fs(struct super_block *sb)
{
- return 0;
+ return -EOPNOTSUPP;
}
static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
-static inline int erofs_fscache_register_cookie(struct super_block *sb,
- struct erofs_fscache **fscache,
- char *name, bool need_inode)
+static inline
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, bool need_inode)
{
return -EOPNOTSUPP;
}
-static inline void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)
+static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
{
}
#endif
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 9716d355a63e..79e871c04fe2 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -224,10 +224,10 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
struct erofs_device_info *dif, erofs_off_t *pos)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct erofs_fscache *fscache;
struct erofs_deviceslot *dis;
struct block_device *bdev;
void *ptr;
- int ret;
ptr = erofs_read_metabuf(buf, sb, erofs_blknr(*pos), EROFS_KMAP);
if (IS_ERR(ptr))
@@ -245,10 +245,10 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
}
if (erofs_is_fscache_mode(sb)) {
- ret = erofs_fscache_register_cookie(sb, &dif->fscache,
- dif->path, false);
- if (ret)
- return ret;
+ fscache = erofs_fscache_register_cookie(sb, dif->path, false);
+ if (IS_ERR(fscache))
+ return PTR_ERR(fscache);
+ dif->fscache = fscache;
} else {
bdev = blkdev_get_by_path(dif->path, FMODE_READ | FMODE_EXCL,
sb->s_type);
@@ -706,11 +706,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
- err = erofs_fscache_register_cookie(sb, &sbi->s_fscache,
- sbi->opt.fsid, true);
- if (err)
- return err;
-
err = super_setup_bdi(sb);
if (err)
return err;
@@ -817,7 +812,8 @@ static int erofs_release_device_info(int id, void *ptr, void *data)
fs_put_dax(dif->dax_dev, NULL);
if (dif->bdev)
blkdev_put(dif->bdev, FMODE_READ | FMODE_EXCL);
- erofs_fscache_unregister_cookie(&dif->fscache);
+ erofs_fscache_unregister_cookie(dif->fscache);
+ dif->fscache = NULL;
kfree(dif->path);
kfree(dif);
return 0;
@@ -889,7 +885,6 @@ static void erofs_kill_sb(struct super_block *sb)
erofs_free_dev_context(sbi->devs);
fs_put_dax(sbi->dax_dev, NULL);
- erofs_fscache_unregister_cookie(&sbi->s_fscache);
erofs_fscache_unregister_fs(sb);
kfree(sbi->opt.fsid);
kfree(sbi);
@@ -909,7 +904,8 @@ static void erofs_put_super(struct super_block *sb)
iput(sbi->managed_cache);
sbi->managed_cache = NULL;
#endif
- erofs_fscache_unregister_cookie(&sbi->s_fscache);
+ erofs_fscache_unregister_fs(sb);
+ sbi->s_fscache = NULL;
}
static struct file_system_type erofs_fs_type = {
--
2.20.1