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bcachefs uses 64 bit inode numbers by default, which overflow genradix keys when we multiply the inode number by the object size for the actual genradix lookup. Switch to a rhashtable, and only index files that actually have hardlinks. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _POSIX_TO_BCACHEFS_H
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#define _POSIX_TO_BCACHEFS_H
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/*
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* This header exports the functionality needed for copying data from existing
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* posix compliant filesystems to bcachefs. There are two use cases:
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* 1. Creating a new bcachefs filesystem using `bcachefs format`, we can
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* specify a source directory tree which will be copied over the new
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* bcachefs filesytem.
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* 2. Migrating an existing filesystem in place, with `bcachefs migrate`.
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* This will allocate space for the bcachefs metadata, but the actual data
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* represented by the extents will not be duplicated. The bcachefs metadata
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* will simply point to the existing extents.
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*
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* To avoid code duplication, `copy_fs` deals with both cases. See the function
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* documentation for more details.
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*/
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#include "libbcachefs.h"
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enum bch_migrate_type {
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BCH_MIGRATE_copy,
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BCH_MIGRATE_migrate
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};
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/*
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* The migrate action uses all the fields in this struct.
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* The copy action only uses the `hardlinks` field. Since `hardlinks` is
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* initialized with zeroes, an empty `copy_fs_state` struct can be passed.
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*/
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struct copy_fs_state {
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u64 bcachefs_inum;
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dev_t dev;
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struct rhashtable hardlinks;
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ranges extents;
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enum bch_migrate_type type;
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unsigned verbosity;
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u64 reserve_start;
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u64 total_files;
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u64 total_input;
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u64 total_wrote;
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u64 total_linked;
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};
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/*
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* The `copy_fs` function is used for both copying a directory tree to a new
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* bcachefs filesystem and migrating an existing one, depending on the value
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* from the `type` field in `copy_fs_state` struct.
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*
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* In case of copy, an empty `copy_fs_state` structure is passed to `copy_fs`
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* (only the `hardlinks` field is used, and that is initialized with zeroes).
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*
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* In the migrate case, all the fields from `copy_fs_state` need to be
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* initialized (`hardlinks` is initialized with zeroes).
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*/
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int copy_fs(struct bch_fs *, struct copy_fs_state *, int, const char *);
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#endif /* _LIBBCACHE_H */
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