111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022-2024 Oracle.
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* All Rights Reserved.
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*/
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#ifndef __XFS_PARENT_H__
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#define __XFS_PARENT_H__
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/* Metadata validators */
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bool xfs_parent_namecheck(unsigned int attr_flags, const void *name,
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size_t length);
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bool xfs_parent_valuecheck(struct xfs_mount *mp, const void *value,
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size_t valuelen);
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xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name,
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int namelen, xfs_ino_t parent_ino);
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xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name,
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int namelen, const void *value, int valuelen);
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/* Initializes a xfs_parent_rec to be stored as an attribute name. */
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static inline void
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xfs_parent_rec_init(
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struct xfs_parent_rec *rec,
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xfs_ino_t ino,
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uint32_t gen)
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{
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rec->p_ino = cpu_to_be64(ino);
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rec->p_gen = cpu_to_be32(gen);
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}
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/* Initializes a xfs_parent_rec to be stored as an attribute name. */
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static inline void
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xfs_inode_to_parent_rec(
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struct xfs_parent_rec *rec,
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const struct xfs_inode *dp)
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{
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xfs_parent_rec_init(rec, dp->i_ino, VFS_IC(dp)->i_generation);
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}
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extern struct kmem_cache *xfs_parent_args_cache;
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/*
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* Parent pointer information needed to pass around the deferred xattr update
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* machinery.
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*/
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struct xfs_parent_args {
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struct xfs_parent_rec rec;
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struct xfs_parent_rec new_rec;
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struct xfs_da_args args;
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};
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/*
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* Start a parent pointer update by allocating the context object we need to
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* perform a parent pointer update.
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*/
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static inline int
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xfs_parent_start(
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struct xfs_mount *mp,
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struct xfs_parent_args **ppargsp)
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{
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if (!xfs_has_parent(mp)) {
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*ppargsp = NULL;
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return 0;
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}
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*ppargsp = kmem_cache_zalloc(xfs_parent_args_cache, GFP_KERNEL);
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if (!*ppargsp)
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return -ENOMEM;
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return 0;
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}
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/* Finish a parent pointer update by freeing the context object. */
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static inline void
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xfs_parent_finish(
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struct xfs_mount *mp,
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struct xfs_parent_args *ppargs)
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{
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if (ppargs)
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kmem_cache_free(xfs_parent_args_cache, ppargs);
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}
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int xfs_parent_addname(struct xfs_trans *tp, struct xfs_parent_args *ppargs,
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struct xfs_inode *dp, const struct xfs_name *parent_name,
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struct xfs_inode *child);
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int xfs_parent_removename(struct xfs_trans *tp, struct xfs_parent_args *ppargs,
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struct xfs_inode *dp, const struct xfs_name *parent_name,
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struct xfs_inode *child);
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int xfs_parent_replacename(struct xfs_trans *tp,
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struct xfs_parent_args *ppargs,
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struct xfs_inode *old_dp, const struct xfs_name *old_name,
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struct xfs_inode *new_dp, const struct xfs_name *new_name,
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struct xfs_inode *child);
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int xfs_parent_from_attr(struct xfs_mount *mp, unsigned int attr_flags,
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const unsigned char *name, unsigned int namelen,
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const void *value, unsigned int valuelen,
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xfs_ino_t *parent_ino, uint32_t *parent_gen);
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/* Repair functions */
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int xfs_parent_lookup(struct xfs_trans *tp, struct xfs_inode *ip,
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const struct xfs_name *name, struct xfs_parent_rec *pptr,
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struct xfs_da_args *scratch);
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int xfs_parent_set(struct xfs_inode *ip, xfs_ino_t owner,
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const struct xfs_name *name, struct xfs_parent_rec *pptr,
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struct xfs_da_args *scratch);
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int xfs_parent_unset(struct xfs_inode *ip, xfs_ino_t owner,
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const struct xfs_name *name, struct xfs_parent_rec *pptr,
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struct xfs_da_args *scratch);
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#endif /* __XFS_PARENT_H__ */
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