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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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710fb4e0ab
Previously, io path option changes on a file would be picked up automatically and applied to existing data - but not for reflinked data, as we had no way of doing this safely. A user may have had permission to copy (and reflink) a given file, but not write to it, and if so they shouldn't be allowed to change e.g. nr_replicas or other options. This uses the incompat feature mechanism in the previous patch to add a new incompatible flag to bch_reflink_p, indicating whether a given reflink pointer may propagate io path option changes back to the indirect extent. In this initial patch we're only setting it for the source extents. We'd like to set it for the destination in a reflink copy, when the user has write access to the source, but that requires mnt_idmap which is not curretly plumbed up to remap_file_range. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_REFLINK_H
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#define _BCACHEFS_REFLINK_H
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int bch2_reflink_p_validate(struct bch_fs *, struct bkey_s_c,
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struct bkey_validate_context);
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void bch2_reflink_p_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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bool bch2_reflink_p_merge(struct bch_fs *, struct bkey_s, struct bkey_s_c);
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int bch2_trigger_reflink_p(struct btree_trans *, enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s,
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enum btree_iter_update_trigger_flags);
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#define bch2_bkey_ops_reflink_p ((struct bkey_ops) { \
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.key_validate = bch2_reflink_p_validate, \
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.val_to_text = bch2_reflink_p_to_text, \
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.key_merge = bch2_reflink_p_merge, \
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.trigger = bch2_trigger_reflink_p, \
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.min_val_size = 16, \
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})
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int bch2_reflink_v_validate(struct bch_fs *, struct bkey_s_c,
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struct bkey_validate_context);
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void bch2_reflink_v_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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int bch2_trigger_reflink_v(struct btree_trans *, enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s,
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enum btree_iter_update_trigger_flags);
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#define bch2_bkey_ops_reflink_v ((struct bkey_ops) { \
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.key_validate = bch2_reflink_v_validate, \
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.val_to_text = bch2_reflink_v_to_text, \
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.swab = bch2_ptr_swab, \
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.trigger = bch2_trigger_reflink_v, \
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.min_val_size = 8, \
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})
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int bch2_indirect_inline_data_validate(struct bch_fs *, struct bkey_s_c,
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struct bkey_validate_context);
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void bch2_indirect_inline_data_to_text(struct printbuf *,
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struct bch_fs *, struct bkey_s_c);
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int bch2_trigger_indirect_inline_data(struct btree_trans *,
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enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s,
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enum btree_iter_update_trigger_flags);
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#define bch2_bkey_ops_indirect_inline_data ((struct bkey_ops) { \
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.key_validate = bch2_indirect_inline_data_validate, \
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.val_to_text = bch2_indirect_inline_data_to_text, \
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.trigger = bch2_trigger_indirect_inline_data, \
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.min_val_size = 8, \
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})
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static inline const __le64 *bkey_refcount_c(struct bkey_s_c k)
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{
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switch (k.k->type) {
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case KEY_TYPE_reflink_v:
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return &bkey_s_c_to_reflink_v(k).v->refcount;
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case KEY_TYPE_indirect_inline_data:
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return &bkey_s_c_to_indirect_inline_data(k).v->refcount;
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default:
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return NULL;
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}
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}
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static inline __le64 *bkey_refcount(struct bkey_s k)
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{
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switch (k.k->type) {
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case KEY_TYPE_reflink_v:
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return &bkey_s_to_reflink_v(k).v->refcount;
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case KEY_TYPE_indirect_inline_data:
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return &bkey_s_to_indirect_inline_data(k).v->refcount;
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default:
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return NULL;
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}
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}
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struct bkey_s_c bch2_lookup_indirect_extent(struct btree_trans *, struct btree_iter *,
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s64 *, struct bkey_s_c_reflink_p,
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bool, unsigned);
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s64 bch2_remap_range(struct bch_fs *, subvol_inum, u64,
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subvol_inum, u64, u64, u64, s64 *,
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bool);
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int bch2_gc_reflink_done(struct bch_fs *);
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int bch2_gc_reflink_start(struct bch_fs *);
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#endif /* _BCACHEFS_REFLINK_H */
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