Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * This file is part of UBIFS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2006-2008 Nokia Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Authors: Artem Bityutskiy (Битюцкий Артём)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *          Adrian Hunter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * This file contains miscellaneous helper functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #ifndef __UBIFS_MISC_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define __UBIFS_MISC_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * ubifs_zn_dirty - check if znode is dirty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * @znode: znode to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * This helper function returns %1 if @znode is dirty and %0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	return !!test_bit(DIRTY_ZNODE, &znode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * ubifs_zn_obsolete - check if znode is obsolete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * @znode: znode to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * This helper function returns %1 if @znode is obsolete and %0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static inline int ubifs_zn_obsolete(const struct ubifs_znode *znode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return !!test_bit(OBSOLETE_ZNODE, &znode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * ubifs_zn_cow - check if znode has to be copied on write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * @znode: znode to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * This helper function returns %1 if @znode is has COW flag set and %0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static inline int ubifs_zn_cow(const struct ubifs_znode *znode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return !!test_bit(COW_ZNODE, &znode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * ubifs_wake_up_bgt - wake up background thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static inline void ubifs_wake_up_bgt(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (c->bgt && !c->need_bgt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		c->need_bgt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		wake_up_process(c->bgt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * ubifs_tnc_find_child - find next child in znode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * @znode: znode to search at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * @start: the zbranch index to start at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  * This helper function looks for znode child starting at index @start. Returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  * the child or %NULL if no children were found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static inline struct ubifs_znode *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) ubifs_tnc_find_child(struct ubifs_znode *znode, int start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	while (start < znode->child_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (znode->zbranch[start].znode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			return znode->zbranch[start].znode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		start += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * ubifs_inode - get UBIFS inode information by VFS 'struct inode' object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * @inode: the VFS 'struct inode' pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static inline struct ubifs_inode *ubifs_inode(const struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return container_of(inode, struct ubifs_inode, vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * ubifs_compr_present - check if compressor was compiled in.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * @compr_type: compressor type to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * This function returns %1 of compressor of type @compr_type is present, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  * %0 if not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static inline int ubifs_compr_present(struct ubifs_info *c, int compr_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	ubifs_assert(c, compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	return !!ubifs_compressors[compr_type]->capi_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * ubifs_compr_name - get compressor name string by its type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  * @compr_type: compressor type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  * This function returns compressor type string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static inline const char *ubifs_compr_name(struct ubifs_info *c, int compr_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	ubifs_assert(c, compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return ubifs_compressors[compr_type]->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * ubifs_wbuf_sync - synchronize write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * @wbuf: write-buffer to synchronize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  * This is the same as 'ubifs_wbuf_sync_nolock()' but it does not assume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  * that the write-buffer is already locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	err = ubifs_wbuf_sync_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	mutex_unlock(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * ubifs_encode_dev - encode device node IDs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * @dev: UBIFS device node information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * @rdev: device IDs to encode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * This is a helper function which encodes major/minor numbers of a device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * into UBIFS device node description. We use standard Linux "new" and "huge"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * encodings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static inline int ubifs_encode_dev(union ubifs_dev_desc *dev, dev_t rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	dev->new = cpu_to_le32(new_encode_dev(rdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return sizeof(dev->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  * ubifs_add_dirt - add dirty space to LEB properties.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * @lnum: LEB to add dirty space for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * @dirty: dirty space to add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)  * This is a helper function which increased amount of dirty LEB space. Returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  * zero in case of success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static inline int ubifs_add_dirt(struct ubifs_info *c, int lnum, int dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return ubifs_update_one_lp(c, lnum, LPROPS_NC, dirty, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * ubifs_return_leb - return LEB to lprops.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)  * @lnum: LEB to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)  * This helper function cleans the "taken" flag of a logical eraseblock in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)  * lprops. Returns zero in case of success and a negative error code in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static inline int ubifs_return_leb(struct ubifs_info *c, int lnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 				   LPROPS_TAKEN, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * ubifs_idx_node_sz - return index node size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * @child_cnt: number of children of this index node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static inline int ubifs_idx_node_sz(const struct ubifs_info *c, int child_cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return UBIFS_IDX_NODE_SZ + (UBIFS_BRANCH_SZ + c->key_len + c->hash_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				   * child_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  * ubifs_idx_branch - return pointer to an index branch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * @idx: index node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  * @bnum: branch number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) struct ubifs_branch *ubifs_idx_branch(const struct ubifs_info *c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 				      const struct ubifs_idx_node *idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 				      int bnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return (struct ubifs_branch *)((void *)idx->branches +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			(UBIFS_BRANCH_SZ + c->key_len + c->hash_len) * bnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  * ubifs_idx_key - return pointer to an index key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  * @idx: index node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static inline void *ubifs_idx_key(const struct ubifs_info *c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 				  const struct ubifs_idx_node *idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	return (void *)((struct ubifs_branch *)idx->branches)->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * ubifs_tnc_lookup - look up a file-system node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * @key: node key to lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  * @node: the node is returned here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * This function look up and reads node with key @key. The caller has to make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * sure the @node buffer is large enough to fit the node. Returns zero in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * of success, %-ENOENT if the node was not found, and a negative error code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static inline int ubifs_tnc_lookup(struct ubifs_info *c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 				   const union ubifs_key *key, void *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return ubifs_tnc_locate(c, key, node, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  * ubifs_get_lprops - get reference to LEB properties.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * This function locks lprops. Lprops have to be unlocked by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  * 'ubifs_release_lprops()'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static inline void ubifs_get_lprops(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	mutex_lock(&c->lp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * ubifs_release_lprops - release lprops lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  * @c: the UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * This function has to be called after each 'ubifs_get_lprops()' call to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  * unlock lprops.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static inline void ubifs_release_lprops(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ubifs_assert(c, mutex_is_locked(&c->lp_mutex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	ubifs_assert(c, c->lst.empty_lebs >= 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		     c->lst.empty_lebs <= c->main_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	mutex_unlock(&c->lp_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)  * ubifs_next_log_lnum - switch to the next log LEB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)  * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)  * @lnum: current log LEB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)  * This helper function returns the log LEB number which goes next after LEB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  * 'lnum'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static inline int ubifs_next_log_lnum(const struct ubifs_info *c, int lnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	lnum += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (lnum > c->log_last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		lnum = UBIFS_LOG_LNUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return lnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static inline int ubifs_xattr_max_cnt(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	int max_xattrs = (c->leb_size / 2) / UBIFS_INO_NODE_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	ubifs_assert(c, max_xattrs < c->max_orphans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return max_xattrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) const char *ubifs_assert_action_name(struct ubifs_info *c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) #endif /* __UBIFS_MISC_H__ */