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| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-08-26 02:56:13 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-02 23:10:44 +0300 |
| commit | 47320fbe11a6059ae502c9c16b668022fdb4cf76 (patch) | |
| tree | fc3f4623904bf518c2ed13806decb56f8c1f8b6d /fs/configfs/configfs_internal.h | |
| parent | f19e4ed1e1edbfa3c9ccb9fed17759b7d6db24c6 (diff) | |
| download | linux-47320fbe11a6059ae502c9c16b668022fdb4cf76.tar.xz | |
configfs: new object reprsenting tree fragments
Refcounted, hangs of configfs_dirent, created by operations that add
fragments to configfs tree (mkdir and configfs_register_{subsystem,group}).
Will be used in the next commit to provide exclusion between fragment
removal and ->show/->store calls.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/configfs/configfs_internal.h')
| -rw-r--r-- | fs/configfs/configfs_internal.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h index f752d83a9c44..520f1813e789 100644 --- a/fs/configfs/configfs_internal.h +++ b/fs/configfs/configfs_internal.h @@ -20,6 +20,15 @@ #include <linux/list.h> #include <linux/spinlock.h> +struct configfs_fragment { + atomic_t frag_count; + struct rw_semaphore frag_sem; + bool frag_dead; +}; + +void put_fragment(struct configfs_fragment *); +struct configfs_fragment *get_fragment(struct configfs_fragment *); + struct configfs_dirent { atomic_t s_count; int s_dependent_count; @@ -34,6 +43,7 @@ struct configfs_dirent { #ifdef CONFIG_LOCKDEP int s_depth; #endif + struct configfs_fragment *s_frag; }; #define CONFIGFS_ROOT 0x0001 @@ -61,8 +71,8 @@ extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct in extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); extern int configfs_create_bin_file(struct config_item *, const struct configfs_bin_attribute *); -extern int configfs_make_dirent(struct configfs_dirent *, - struct dentry *, void *, umode_t, int); +extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *, + void *, umode_t, int, struct configfs_fragment *); extern int configfs_dirent_is_ready(struct configfs_dirent *); extern void configfs_hash_and_remove(struct dentry * dir, const char * name); @@ -137,6 +147,7 @@ static inline void release_configfs_dirent(struct configfs_dirent * sd) { if (!(sd->s_type & CONFIGFS_ROOT)) { kfree(sd->s_iattr); + put_fragment(sd->s_frag); kmem_cache_free(configfs_dir_cachep, sd); } } |