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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2016-08-02 23:05:06 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-03 01:35:17 +0200
commit6625689e159fa1d43572ee113713ab23bec03131 (patch)
tree344f75d3ff037dd65e07eb96a47214ed3cc867f1
parentnilfs2: add nilfs_msg() message interface (diff)
downloadlinux-6625689e159fa1d43572ee113713ab23bec03131.tar.xz
linux-6625689e159fa1d43572ee113713ab23bec03131.zip
nilfs2: embed a back pointer to super block instance in nilfs object
Insert a back pointer to super block instance in nilfs object so that functions of nilfs2 easily refer to the super block instance. This simplifies replacement of printk() in the successive change. Link: http://lkml.kernel.org/r/1464875891-5443-4-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/nilfs2/super.c2
-rw-r--r--fs/nilfs2/the_nilfs.c7
-rw-r--r--fs/nilfs2/the_nilfs.h4
3 files changed, 8 insertions, 5 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 86e3c00994e2..2d4d0bec711e 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1076,7 +1076,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent)
__u64 cno;
int err;
- nilfs = alloc_nilfs(sb->s_bdev);
+ nilfs = alloc_nilfs(sb);
if (!nilfs)
return -ENOMEM;
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index e9fd241b9a0a..702115164cf3 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -56,12 +56,12 @@ void nilfs_set_last_segment(struct the_nilfs *nilfs,
/**
* alloc_nilfs - allocate a nilfs object
- * @bdev: block device to which the_nilfs is related
+ * @sb: super block instance
*
* Return Value: On success, pointer to the_nilfs is returned.
* On error, NULL is returned.
*/
-struct the_nilfs *alloc_nilfs(struct block_device *bdev)
+struct the_nilfs *alloc_nilfs(struct super_block *sb)
{
struct the_nilfs *nilfs;
@@ -69,7 +69,8 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev)
if (!nilfs)
return NULL;
- nilfs->ns_bdev = bdev;
+ nilfs->ns_sb = sb;
+ nilfs->ns_bdev = sb->s_bdev;
atomic_set(&nilfs->ns_ndirtyblks, 0);
init_rwsem(&nilfs->ns_sem);
mutex_init(&nilfs->ns_snapshot_mount_mutex);
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 79369fd6b13b..79d1421896d0 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -43,6 +43,7 @@ enum {
* struct the_nilfs - struct to supervise multiple nilfs mount points
* @ns_flags: flags
* @ns_flushed_device: flag indicating if all volatile data was flushed
+ * @ns_sb: back pointer to super block instance
* @ns_bdev: block device
* @ns_sem: semaphore for shared states
* @ns_snapshot_mount_mutex: mutex to protect snapshot mounts
@@ -102,6 +103,7 @@ struct the_nilfs {
unsigned long ns_flags;
int ns_flushed_device;
+ struct super_block *ns_sb;
struct block_device *ns_bdev;
struct rw_semaphore ns_sem;
struct mutex ns_snapshot_mount_mutex;
@@ -281,7 +283,7 @@ static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
}
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
-struct the_nilfs *alloc_nilfs(struct block_device *bdev);
+struct the_nilfs *alloc_nilfs(struct super_block *sb);
void destroy_nilfs(struct the_nilfs *nilfs);
int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data);
int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb);