diff options
| author | Jan Kara <jack@suse.cz> | 2012-07-03 16:45:31 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-22 23:58:45 +0400 |
| commit | 5c0d6b60a0ba46d45020547eacf7199171920935 (patch) | |
| tree | 7d9f99cc40981dc0872e1ac33317f48b9e1f2bfb | |
| parent | b3de653105180b57af90ef2f5b8441f085f4ff56 (diff) | |
vfs: Create function for iterating over block devices
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/block_dev.c | 36 | ||||
| -rw-r--r-- | include/linux/fs.h | 5 |
2 files changed, 41 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index c2bbe1fb132..1e519195d45 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1710,3 +1710,39 @@ int __invalidate_device(struct block_device *bdev, bool kill_dirty) return res; } EXPORT_SYMBOL(__invalidate_device); + +void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) +{ + struct inode *inode, *old_inode = NULL; + + spin_lock(&inode_sb_list_lock); + list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) { + struct address_space *mapping = inode->i_mapping; + + spin_lock(&inode->i_lock); + if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) || + mapping->nrpages == 0) { + spin_unlock(&inode->i_lock); + continue; + } + __iget(inode); + spin_unlock(&inode->i_lock); + spin_unlock(&inode_sb_list_lock); + /* + * We hold a reference to 'inode' so it couldn't have been + * removed from s_inodes list while we dropped the + * inode_sb_list_lock. We cannot iput the inode now as we can + * be holding the last reference and we cannot iput it under + * inode_sb_list_lock. So we keep the reference and iput it + * later. + */ + iput(old_inode); + old_inode = inode; + + func(I_BDEV(inode), arg); + + spin_lock(&inode_sb_list_lock); + } + spin_unlock(&inode_sb_list_lock); + iput(old_inode); +} diff --git a/include/linux/fs.h b/include/linux/fs.h index 48548bdd772..6a6ca85bee2 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2102,6 +2102,7 @@ extern sector_t blkdev_max_block(struct block_device *bdev); extern void bd_forget(struct inode *inode); extern void bdput(struct block_device *); extern void invalidate_bdev(struct block_device *); +extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); extern int sync_blockdev(struct block_device *bdev); extern void kill_bdev(struct block_device *); extern struct super_block *freeze_bdev(struct block_device *); @@ -2123,6 +2124,10 @@ static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) { return 0; } + +static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) +{ +} #endif extern int sync_filesystem(struct super_block *); extern const struct file_operations def_blk_fops; |