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e614a6c52d
The isize of directory is 0 in bcachefs if the directory is empty.
With more child dirents created, its size ought to change. Many
other filesystems changed as that (ie. xfs and btrfs). And many of
them changed as the size of child dirent name. Although the directory
size may not seem to convey much, we can still give it some meaning.
The formula of dentry size as follow:
occupied_size = 40 + ALIGN(9 + namelen, 8)
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_DIRENT_H
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#define _BCACHEFS_DIRENT_H
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#include "str_hash.h"
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extern const struct bch_hash_desc bch2_dirent_hash_desc;
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int bch2_dirent_validate(struct bch_fs *, struct bkey_s_c,
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struct bkey_validate_context);
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void bch2_dirent_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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#define bch2_bkey_ops_dirent ((struct bkey_ops) { \
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.key_validate = bch2_dirent_validate, \
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.val_to_text = bch2_dirent_to_text, \
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.min_val_size = 16, \
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})
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struct qstr;
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struct file;
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struct dir_context;
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struct bch_fs;
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struct bch_hash_info;
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struct bch_inode_info;
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struct qstr bch2_dirent_get_name(struct bkey_s_c_dirent d);
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static inline unsigned dirent_val_u64s(unsigned len)
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{
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return DIV_ROUND_UP(offsetof(struct bch_dirent, d_name) + len,
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sizeof(u64));
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}
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static inline unsigned int dirent_occupied_size(const struct qstr *name)
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{
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return (BKEY_U64s + dirent_val_u64s(name->len)) * sizeof(u64);
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}
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int bch2_dirent_read_target(struct btree_trans *, subvol_inum,
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struct bkey_s_c_dirent, subvol_inum *);
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static inline void dirent_copy_target(struct bkey_i_dirent *dst,
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struct bkey_s_c_dirent src)
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{
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dst->v.d_inum = src.v->d_inum;
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dst->v.d_type = src.v->d_type;
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}
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int bch2_dirent_create_snapshot(struct btree_trans *, u32, u64, u32,
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const struct bch_hash_info *, u8,
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const struct qstr *, u64, u64 *,
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enum btree_iter_update_trigger_flags);
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int bch2_dirent_create(struct btree_trans *, subvol_inum,
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const struct bch_hash_info *, u8,
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const struct qstr *, u64, u64 *,
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enum btree_iter_update_trigger_flags);
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static inline unsigned vfs_d_type(unsigned type)
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{
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return type == DT_SUBVOL ? DT_DIR : type;
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}
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enum bch_rename_mode {
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BCH_RENAME,
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BCH_RENAME_OVERWRITE,
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BCH_RENAME_EXCHANGE,
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};
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int bch2_dirent_rename(struct btree_trans *,
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subvol_inum, struct bch_hash_info *,
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subvol_inum, struct bch_hash_info *,
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const struct qstr *, subvol_inum *, u64 *,
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const struct qstr *, subvol_inum *, u64 *,
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enum bch_rename_mode);
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int bch2_dirent_lookup_trans(struct btree_trans *, struct btree_iter *,
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subvol_inum, const struct bch_hash_info *,
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const struct qstr *, subvol_inum *, unsigned);
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u64 bch2_dirent_lookup(struct bch_fs *, subvol_inum,
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const struct bch_hash_info *,
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const struct qstr *, subvol_inum *);
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int bch2_empty_dir_snapshot(struct btree_trans *, u64, u32, u32);
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int bch2_empty_dir_trans(struct btree_trans *, subvol_inum);
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int bch2_readdir(struct bch_fs *, subvol_inum, struct dir_context *);
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#endif /* _BCACHEFS_DIRENT_H */
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