diff options
Diffstat (limited to 'fs/nilfs2/mdt.c')
| -rw-r--r-- | fs/nilfs2/mdt.c | 59 |
1 files changed, 27 insertions, 32 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c index 965b5ad1c0df..3f7510beebbb 100644 --- a/fs/nilfs2/mdt.c +++ b/fs/nilfs2/mdt.c @@ -226,20 +226,21 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, * @out_bh: output of a pointer to the buffer_head * * nilfs_mdt_get_block() looks up the specified buffer and tries to create - * a new buffer if @create is not zero. On success, the returned buffer is - * assured to be either existing or formatted using a buffer lock on success. - * @out_bh is substituted only when zero is returned. + * a new buffer if @create is not zero. If (and only if) this function + * succeeds, it stores a pointer to the retrieved buffer head in the location + * pointed to by @out_bh. * - * Return Value: On success, it returns 0. On error, the following negative - * error code is returned. + * The retrieved buffer may be either an existing one or a newly allocated one. + * For a newly created buffer, if the callback function argument @init_block + * is non-NULL, the callback will be called with the buffer locked to format + * the block. * - * %-ENOMEM - Insufficient memory available. - * - * %-EIO - I/O error - * - * %-ENOENT - the specified block does not exist (hole block) - * - * %-EROFS - Read only filesystem (for create mode) + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOENT - The specified block does not exist (hole block). + * * %-ENOMEM - Insufficient memory available. + * * %-EROFS - Read only filesystem (for create mode). */ int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, void (*init_block)(struct inode *, @@ -275,14 +276,11 @@ int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, * @out_bh, and block offset to @blkoff, respectively. @out_bh and * @blkoff are substituted only when zero is returned. * - * Return Value: On success, it returns 0. On error, the following negative - * error code is returned. - * - * %-ENOMEM - Insufficient memory available. - * - * %-EIO - I/O error - * - * %-ENOENT - no block was found in the range + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOENT - No block was found in the range. + * * %-ENOMEM - Insufficient memory available. */ int nilfs_mdt_find_block(struct inode *inode, unsigned long start, unsigned long end, unsigned long *blkoff, @@ -321,12 +319,11 @@ out: * @inode: inode of the meta data file * @block: block offset * - * Return Value: On success, zero is returned. - * On error, one of the following negative error code is returned. - * - * %-ENOMEM - Insufficient memory available. - * - * %-EIO - I/O error + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOENT - Non-existent block. + * * %-ENOMEM - Insufficient memory available. */ int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) { @@ -349,12 +346,10 @@ int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and * tries to release the page including the buffer from a page cache. * - * Return Value: On success, 0 is returned. On error, one of the following - * negative error code is returned. - * - * %-EBUSY - page has an active buffer. - * - * %-ENOENT - page cache has no page addressed by the offset. + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EBUSY - Page has an active buffer. + * * %-ENOENT - Page cache has no page addressed by the offset. */ int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) { |