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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /fs/nilfs2/mdt.h | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nilfs2/mdt.h')
-rw-r--r-- | fs/nilfs2/mdt.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h new file mode 100644 index 000000000..9e23bab3f --- /dev/null +++ b/fs/nilfs2/mdt.h @@ -0,0 +1,115 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * NILFS meta data file prototype and definitions + * + * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. + * + * Written by Ryusuke Konishi. + */ + +#ifndef _NILFS_MDT_H +#define _NILFS_MDT_H + +#include <linux/buffer_head.h> +#include <linux/blockgroup_lock.h> +#include "nilfs.h" +#include "page.h" + +/** + * struct nilfs_shadow_map - shadow mapping of meta data file + * @bmap_store: shadow copy of bmap state + * @inode: holder of page caches used in shadow mapping + * @frozen_buffers: list of frozen buffers + */ +struct nilfs_shadow_map { + struct nilfs_bmap_store bmap_store; + struct inode *inode; + struct list_head frozen_buffers; +}; + +/** + * struct nilfs_mdt_info - on-memory private data of meta data files + * @mi_sem: reader/writer semaphore for meta data operations + * @mi_bgl: per-blockgroup locking + * @mi_entry_size: size of an entry + * @mi_first_entry_offset: offset to the first entry + * @mi_entries_per_block: number of entries in a block + * @mi_palloc_cache: persistent object allocator cache + * @mi_shadow: shadow of bmap and page caches + * @mi_blocks_per_group: number of blocks in a group + * @mi_blocks_per_desc_block: number of blocks per descriptor block + */ +struct nilfs_mdt_info { + struct rw_semaphore mi_sem; + struct blockgroup_lock *mi_bgl; + unsigned int mi_entry_size; + unsigned int mi_first_entry_offset; + unsigned long mi_entries_per_block; + struct nilfs_palloc_cache *mi_palloc_cache; + struct nilfs_shadow_map *mi_shadow; + unsigned long mi_blocks_per_group; + unsigned long mi_blocks_per_desc_block; +}; + +static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) +{ + return inode->i_private; +} + +static inline int nilfs_is_metadata_file_inode(const struct inode *inode) +{ + return inode->i_private != NULL; +} + +/* Default GFP flags using highmem */ +#define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM) + +int nilfs_mdt_get_block(struct inode *, unsigned long, int, + void (*init_block)(struct inode *, + struct buffer_head *, void *), + struct buffer_head **); +int nilfs_mdt_find_block(struct inode *inode, unsigned long start, + unsigned long end, unsigned long *blkoff, + struct buffer_head **out_bh); +int nilfs_mdt_delete_block(struct inode *, unsigned long); +int nilfs_mdt_forget_block(struct inode *, unsigned long); +int nilfs_mdt_fetch_dirty(struct inode *); + +int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz); +void nilfs_mdt_clear(struct inode *inode); +void nilfs_mdt_destroy(struct inode *inode); + +void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int); + +int nilfs_mdt_setup_shadow_map(struct inode *inode, + struct nilfs_shadow_map *shadow); +int nilfs_mdt_save_to_shadow_map(struct inode *inode); +void nilfs_mdt_restore_from_shadow_map(struct inode *inode); +void nilfs_mdt_clear_shadow_map(struct inode *inode); +int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); +struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, + struct buffer_head *bh); + +static inline void nilfs_mdt_mark_dirty(struct inode *inode) +{ + if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) + set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); +} + +static inline void nilfs_mdt_clear_dirty(struct inode *inode) +{ + clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); +} + +static inline __u64 nilfs_mdt_cno(struct inode *inode) +{ + return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno; +} + +static inline spinlock_t * +nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group) +{ + return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group); +} + +#endif /* _NILFS_MDT_H */ |