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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2022-2024 Oracle. * All Rights Reserved. */ #ifndef __XFS_PARENT_H__ #define __XFS_PARENT_H__ /* Metadata validators */ bool xfs_parent_namecheck(unsigned int attr_flags, const void *name, size_t length); bool xfs_parent_valuecheck(struct xfs_mount *mp, const void *value, size_t valuelen); xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name, int namelen, xfs_ino_t parent_ino); xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name, int namelen, const void *value, int valuelen); /* Initializes a xfs_parent_rec to be stored as an attribute name. */ static inline void xfs_parent_rec_init( struct xfs_parent_rec *rec, xfs_ino_t ino, uint32_t gen) { rec->p_ino = cpu_to_be64(ino); rec->p_gen = cpu_to_be32(gen); } /* Initializes a xfs_parent_rec to be stored as an attribute name. */ static inline void xfs_inode_to_parent_rec( struct xfs_parent_rec *rec, const struct xfs_inode *dp) { xfs_parent_rec_init(rec, dp->i_ino, VFS_IC(dp)->i_generation); } extern struct kmem_cache *xfs_parent_args_cache; /* * Parent pointer information needed to pass around the deferred xattr update * machinery. */ struct xfs_parent_args { struct xfs_parent_rec rec; struct xfs_parent_rec new_rec; struct xfs_da_args args; }; /* * Start a parent pointer update by allocating the context object we need to * perform a parent pointer update. */ static inline int xfs_parent_start( struct xfs_mount *mp, struct xfs_parent_args **ppargsp) { if (!xfs_has_parent(mp)) { *ppargsp = NULL; return 0; } *ppargsp = kmem_cache_zalloc(xfs_parent_args_cache, GFP_KERNEL); if (!*ppargsp) return -ENOMEM; return 0; } /* Finish a parent pointer update by freeing the context object. */ static inline void xfs_parent_finish( struct xfs_mount *mp, struct xfs_parent_args *ppargs) { if (ppargs) kmem_cache_free(xfs_parent_args_cache, ppargs); } int xfs_parent_addname(struct xfs_trans *tp, struct xfs_parent_args *ppargs, struct xfs_inode *dp, const struct xfs_name *parent_name, struct xfs_inode *child); int xfs_parent_removename(struct xfs_trans *tp, struct xfs_parent_args *ppargs, struct xfs_inode *dp, const struct xfs_name *parent_name, struct xfs_inode *child); int xfs_parent_replacename(struct xfs_trans *tp, struct xfs_parent_args *ppargs, struct xfs_inode *old_dp, const struct xfs_name *old_name, struct xfs_inode *new_dp, const struct xfs_name *new_name, struct xfs_inode *child); int xfs_parent_from_attr(struct xfs_mount *mp, unsigned int attr_flags, const unsigned char *name, unsigned int namelen, const void *value, unsigned int valuelen, xfs_ino_t *parent_ino, uint32_t *parent_gen); /* Repair functions */ int xfs_parent_lookup(struct xfs_trans *tp, struct xfs_inode *ip, const struct xfs_name *name, struct xfs_parent_rec *pptr, struct xfs_da_args *scratch); int xfs_parent_set(struct xfs_inode *ip, xfs_ino_t owner, const struct xfs_name *name, struct xfs_parent_rec *pptr, struct xfs_da_args *scratch); int xfs_parent_unset(struct xfs_inode *ip, xfs_ino_t owner, const struct xfs_name *name, struct xfs_parent_rec *pptr, struct xfs_da_args *scratch); #endif /* __XFS_PARENT_H__ */ |