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This patch implements support for case-insensitive file name lookups in bcachefs. The implementation uses the same UTF-8 lowering and normalization that ext4 and f2fs is using. More information is provided in Documentation/bcachefs/casefolding.rst Compatibility notes: This uses the new versioning scheme for incompatible features where an incompatible feature is tied to a version number: the superblock says "we may use incompat features up to x" and "incompat features up to x are in use", disallowing mounting by previous versions. Additionally, and old style incompat feature bit is used, so that kernels without utf8 casefolding support know if casefolding specifically is in use and they're allowed to mount. Signed-off-by: Joshua Ashton <joshua@froggi.es> Cc: André Almeida <andrealmeid@igalia.com> Cc: Gabriel Krisman Bertazi <krisman@suse.de> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
180 lines
4.0 KiB
C
180 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_INODE_FORMAT_H
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#define _BCACHEFS_INODE_FORMAT_H
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#define BLOCKDEV_INODE_MAX 4096
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#define BCACHEFS_ROOT_INO 4096
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struct bch_inode {
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struct bch_val v;
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__le64 bi_hash_seed;
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__le32 bi_flags;
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__le16 bi_mode;
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__u8 fields[];
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} __packed __aligned(8);
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struct bch_inode_v2 {
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struct bch_val v;
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__le64 bi_journal_seq;
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__le64 bi_hash_seed;
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__le64 bi_flags;
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__le16 bi_mode;
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__u8 fields[];
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} __packed __aligned(8);
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struct bch_inode_v3 {
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struct bch_val v;
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__le64 bi_journal_seq;
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__le64 bi_hash_seed;
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__le64 bi_flags;
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__le64 bi_sectors;
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__le64 bi_size;
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__le64 bi_version;
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__u8 fields[];
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} __packed __aligned(8);
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#define INODEv3_FIELDS_START_INITIAL 6
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#define INODEv3_FIELDS_START_CUR (offsetof(struct bch_inode_v3, fields) / sizeof(__u64))
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struct bch_inode_generation {
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struct bch_val v;
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__le32 bi_generation;
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__le32 pad;
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} __packed __aligned(8);
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/*
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* bi_subvol and bi_parent_subvol are only set for subvolume roots:
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*/
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#define BCH_INODE_FIELDS_v2() \
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x(bi_atime, 96) \
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x(bi_ctime, 96) \
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x(bi_mtime, 96) \
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x(bi_otime, 96) \
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x(bi_size, 64) \
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x(bi_sectors, 64) \
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x(bi_uid, 32) \
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x(bi_gid, 32) \
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x(bi_nlink, 32) \
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x(bi_generation, 32) \
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x(bi_dev, 32) \
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x(bi_data_checksum, 8) \
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x(bi_compression, 8) \
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x(bi_project, 32) \
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x(bi_background_compression, 8) \
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x(bi_data_replicas, 8) \
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x(bi_promote_target, 16) \
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x(bi_foreground_target, 16) \
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x(bi_background_target, 16) \
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x(bi_erasure_code, 16) \
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x(bi_fields_set, 16) \
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x(bi_dir, 64) \
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x(bi_dir_offset, 64) \
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x(bi_subvol, 32) \
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x(bi_parent_subvol, 32)
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#define BCH_INODE_FIELDS_v3() \
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x(bi_atime, 96) \
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x(bi_ctime, 96) \
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x(bi_mtime, 96) \
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x(bi_otime, 96) \
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x(bi_uid, 32) \
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x(bi_gid, 32) \
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x(bi_nlink, 32) \
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x(bi_generation, 32) \
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x(bi_dev, 32) \
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x(bi_data_checksum, 8) \
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x(bi_compression, 8) \
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x(bi_project, 32) \
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x(bi_background_compression, 8) \
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x(bi_data_replicas, 8) \
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x(bi_promote_target, 16) \
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x(bi_foreground_target, 16) \
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x(bi_background_target, 16) \
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x(bi_erasure_code, 16) \
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x(bi_fields_set, 16) \
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x(bi_dir, 64) \
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x(bi_dir_offset, 64) \
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x(bi_subvol, 32) \
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x(bi_parent_subvol, 32) \
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x(bi_nocow, 8) \
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x(bi_depth, 32) \
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x(bi_inodes_32bit, 8)
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/* subset of BCH_INODE_FIELDS */
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#define BCH_INODE_OPTS() \
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x(data_checksum, 8) \
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x(compression, 8) \
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x(project, 32) \
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x(background_compression, 8) \
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x(data_replicas, 8) \
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x(promote_target, 16) \
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x(foreground_target, 16) \
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x(background_target, 16) \
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x(erasure_code, 16) \
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x(nocow, 8) \
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x(inodes_32bit, 8)
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enum inode_opt_id {
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#define x(name, ...) \
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Inode_opt_##name,
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BCH_INODE_OPTS()
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#undef x
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Inode_opt_nr,
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};
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#define BCH_INODE_FLAGS() \
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x(sync, 0) \
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x(immutable, 1) \
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x(append, 2) \
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x(nodump, 3) \
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x(noatime, 4) \
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x(i_size_dirty, 5) \
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x(i_sectors_dirty, 6) \
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x(unlinked, 7) \
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x(backptr_untrusted, 8) \
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x(has_child_snapshot, 9) \
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x(casefolded, 10)
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/* bits 20+ reserved for packed fields below: */
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enum bch_inode_flags {
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#define x(t, n) BCH_INODE_##t = 1U << n,
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BCH_INODE_FLAGS()
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#undef x
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};
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enum __bch_inode_flags {
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#define x(t, n) __BCH_INODE_##t = n,
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BCH_INODE_FLAGS()
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#undef x
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};
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LE32_BITMASK(INODEv1_STR_HASH, struct bch_inode, bi_flags, 20, 24);
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LE32_BITMASK(INODEv1_NR_FIELDS, struct bch_inode, bi_flags, 24, 31);
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LE32_BITMASK(INODEv1_NEW_VARINT,struct bch_inode, bi_flags, 31, 32);
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LE64_BITMASK(INODEv2_STR_HASH, struct bch_inode_v2, bi_flags, 20, 24);
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LE64_BITMASK(INODEv2_NR_FIELDS, struct bch_inode_v2, bi_flags, 24, 31);
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LE64_BITMASK(INODEv3_STR_HASH, struct bch_inode_v3, bi_flags, 20, 24);
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LE64_BITMASK(INODEv3_NR_FIELDS, struct bch_inode_v3, bi_flags, 24, 31);
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LE64_BITMASK(INODEv3_FIELDS_START,
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struct bch_inode_v3, bi_flags, 31, 36);
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LE64_BITMASK(INODEv3_MODE, struct bch_inode_v3, bi_flags, 36, 52);
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struct bch_inode_alloc_cursor {
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struct bch_val v;
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__u8 bits;
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__u8 pad;
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__le32 gen;
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__le64 idx;
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};
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#endif /* _BCACHEFS_INODE_FORMAT_H */
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