forked from luck/tmp_suning_uos_patched
329 lines
9.0 KiB
C
329 lines
9.0 KiB
C
|
/*
|
|||
|
|
* This file is part of UBIFS.
|
|||
|
|
*
|
|||
|
|
* Copyright (C) 2006-2008 Nokia Corporation
|
|||
|
|
*
|
|||
|
|
* This program is free software; you can redistribute it and/or modify it
|
|||
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|||
|
|
* the Free Software Foundation.
|
|||
|
|
*
|
|||
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|||
|
|
* more details.
|
|||
|
|
*
|
|||
|
|
* You should have received a copy of the GNU General Public License along with
|
|||
|
|
* this program; if not, write to the Free Software Foundation, Inc., 51
|
|||
|
|
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|||
|
|
*
|
|||
|
|
* Authors: Artem Bityutskiy (Битюцкий Артём)
|
|||
|
|
* Adrian Hunter
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* This file contains miscellaneous helper functions.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#ifndef __UBIFS_MISC_H__
|
|||
|
|
#define __UBIFS_MISC_H__
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_zn_dirty - check if znode is dirty.
|
|||
|
|
* @znode: znode to check
|
|||
|
|
*
|
|||
|
|
* This helper function returns %1 if @znode is dirty and %0 otherwise.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
|
|||
|
|
{
|
|||
|
|
return !!test_bit(DIRTY_ZNODE, &znode->flags);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_wake_up_bgt - wake up background thread.
|
|||
|
|
* @c: UBIFS file-system description object
|
|||
|
|
*/
|
|||
|
|
static inline void ubifs_wake_up_bgt(struct ubifs_info *c)
|
|||
|
|
{
|
|||
|
|
if (c->bgt && !c->need_bgt) {
|
|||
|
|
c->need_bgt = 1;
|
|||
|
|
wake_up_process(c->bgt);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_tnc_find_child - find next child in znode.
|
|||
|
|
* @znode: znode to search at
|
|||
|
|
* @start: the zbranch index to start at
|
|||
|
|
*
|
|||
|
|
* This helper function looks for znode child starting at index @start. Returns
|
|||
|
|
* the child or %NULL if no children were found.
|
|||
|
|
*/
|
|||
|
|
static inline struct ubifs_znode *
|
|||
|
|
ubifs_tnc_find_child(struct ubifs_znode *znode, int start)
|
|||
|
|
{
|
|||
|
|
while (start < znode->child_cnt) {
|
|||
|
|
if (znode->zbranch[start].znode)
|
|||
|
|
return znode->zbranch[start].znode;
|
|||
|
|
start += 1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_inode - get UBIFS inode information by VFS 'struct inode' object.
|
|||
|
|
* @inode: the VFS 'struct inode' pointer
|
|||
|
|
*/
|
|||
|
|
static inline struct ubifs_inode *ubifs_inode(const struct inode *inode)
|
|||
|
|
{
|
|||
|
|
return container_of(inode, struct ubifs_inode, vfs_inode);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_compr_present - check if compressor was compiled in.
|
|||
|
|
* @compr_type: compressor type to check
|
|||
|
|
*
|
|||
|
|
* This function returns %1 of compressor of type @compr_type is present, and
|
|||
|
|
* %0 if not.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_compr_present(int compr_type)
|
|||
|
|
{
|
|||
|
|
ubifs_assert(compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
|
|||
|
|
return !!ubifs_compressors[compr_type]->capi_name;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_compr_name - get compressor name string by its type.
|
|||
|
|
* @compr_type: compressor type
|
|||
|
|
*
|
|||
|
|
* This function returns compressor type string.
|
|||
|
|
*/
|
|||
|
|
static inline const char *ubifs_compr_name(int compr_type)
|
|||
|
|
{
|
|||
|
|
ubifs_assert(compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
|
|||
|
|
return ubifs_compressors[compr_type]->name;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_wbuf_sync - synchronize write-buffer.
|
|||
|
|
* @wbuf: write-buffer to synchronize
|
|||
|
|
*
|
|||
|
|
* This is the same as as 'ubifs_wbuf_sync_nolock()' but it does not assume
|
|||
|
|
* that the write-buffer is already locked.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
|
|||
|
|
{
|
|||
|
|
int err;
|
|||
|
|
|
|||
|
|
mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
|
|||
|
|
err = ubifs_wbuf_sync_nolock(wbuf);
|
|||
|
|
mutex_unlock(&wbuf->io_mutex);
|
|||
|
|
return err;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_leb_unmap - unmap an LEB.
|
|||
|
|
* @c: UBIFS file-system description object
|
|||
|
|
* @lnum: LEB number to unmap
|
|||
|
|
*
|
|||
|
|
* This function returns %0 on success and a negative error code on failure.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_leb_unmap(const struct ubifs_info *c, int lnum)
|
|||
|
|
{
|
|||
|
|
int err;
|
|||
|
|
|
|||
|
|
if (c->ro_media)
|
|||
|
|
return -EROFS;
|
|||
|
|
err = ubi_leb_unmap(c->ubi, lnum);
|
|||
|
|
if (err) {
|
|||
|
|
ubifs_err("unmap LEB %d failed, error %d", lnum, err);
|
|||
|
|
return err;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_leb_write - write to a LEB.
|
|||
|
|
* @c: UBIFS file-system description object
|
|||
|
|
* @lnum: LEB number to write
|
|||
|
|
* @buf: buffer to write from
|
|||
|
|
* @offs: offset within LEB to write to
|
|||
|
|
* @len: length to write
|
|||
|
|
* @dtype: data type
|
|||
|
|
*
|
|||
|
|
* This function returns %0 on success and a negative error code on failure.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_leb_write(const struct ubifs_info *c, int lnum,
|
|||
|
|
const void *buf, int offs, int len, int dtype)
|
|||
|
|
{
|
|||
|
|
int err;
|
|||
|
|
|
|||
|
|
if (c->ro_media)
|
|||
|
|
return -EROFS;
|
|||
|
|
err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
|
|||
|
|
if (err) {
|
|||
|
|
ubifs_err("writing %d bytes at %d:%d, error %d",
|
|||
|
|
len, lnum, offs, err);
|
|||
|
|
return err;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_leb_change - atomic LEB change.
|
|||
|
|
* @c: UBIFS file-system description object
|
|||
|
|
* @lnum: LEB number to write
|
|||
|
|
* @buf: buffer to write from
|
|||
|
|
* @len: length to write
|
|||
|
|
* @dtype: data type
|
|||
|
|
*
|
|||
|
|
* This function returns %0 on success and a negative error code on failure.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_leb_change(const struct ubifs_info *c, int lnum,
|
|||
|
|
const void *buf, int len, int dtype)
|
|||
|
|
{
|
|||
|
|
int err;
|
|||
|
|
|
|||
|
|
if (c->ro_media)
|
|||
|
|
return -EROFS;
|
|||
|
|
err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
|
|||
|
|
if (err) {
|
|||
|
|
ubifs_err("changing %d bytes in LEB %d, error %d",
|
|||
|
|
len, lnum, err);
|
|||
|
|
return err;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_encode_dev - encode device node IDs.
|
|||
|
|
* @dev: UBIFS device node information
|
|||
|
|
* @rdev: device IDs to encode
|
|||
|
|
*
|
|||
|
|
* This is a helper function which encodes major/minor numbers of a device node
|
|||
|
|
* into UBIFS device node description. We use standard Linux "new" and "huge"
|
|||
|
|
* encodings.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_encode_dev(union ubifs_dev_desc *dev, dev_t rdev)
|
|||
|
|
{
|
|||
|
|
if (new_valid_dev(rdev)) {
|
|||
|
|
dev->new = cpu_to_le32(new_encode_dev(rdev));
|
|||
|
|
return sizeof(dev->new);
|
|||
|
|
} else {
|
|||
|
|
dev->huge = cpu_to_le64(huge_encode_dev(rdev));
|
|||
|
|
return sizeof(dev->huge);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_add_dirt - add dirty space to LEB properties.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @lnum: LEB to add dirty space for
|
|||
|
|
* @dirty: dirty space to add
|
|||
|
|
*
|
|||
|
|
* This is a helper function which increased amount of dirty LEB space. Returns
|
|||
|
|
* zero in case of success and a negative error code in case of failure.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_add_dirt(struct ubifs_info *c, int lnum, int dirty)
|
|||
|
|
{
|
|||
|
|
return ubifs_update_one_lp(c, lnum, LPROPS_NC, dirty, 0, 0);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_return_leb - return LEB to lprops.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @lnum: LEB to return
|
|||
|
|
*
|
|||
|
|
* This helper function cleans the "taken" flag of a logical eraseblock in the
|
|||
|
|
* lprops. Returns zero in case of success and a negative error code in case of
|
|||
|
|
* failure.
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_return_leb(struct ubifs_info *c, int lnum)
|
|||
|
|
{
|
|||
|
|
return ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
|
|||
|
|
LPROPS_TAKEN, 0);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_idx_node_sz - return index node size.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @child_cnt: number of children of this index node
|
|||
|
|
*/
|
|||
|
|
static inline int ubifs_idx_node_sz(const struct ubifs_info *c, int child_cnt)
|
|||
|
|
{
|
|||
|
|
return UBIFS_IDX_NODE_SZ + (UBIFS_BRANCH_SZ + c->key_len) * child_cnt;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_idx_branch - return pointer to an index branch.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @idx: index node
|
|||
|
|
* @bnum: branch number
|
|||
|
|
*/
|
|||
|
|
static inline
|
|||
|
|
struct ubifs_branch *ubifs_idx_branch(const struct ubifs_info *c,
|
|||
|
|
const struct ubifs_idx_node *idx,
|
|||
|
|
int bnum)
|
|||
|
|
{
|
|||
|
|
return (struct ubifs_branch *)((void *)idx->branches +
|
|||
|
|
(UBIFS_BRANCH_SZ + c->key_len) * bnum);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_idx_key - return pointer to an index key.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @idx: index node
|
|||
|
|
*/
|
|||
|
|
static inline void *ubifs_idx_key(const struct ubifs_info *c,
|
|||
|
|
const struct ubifs_idx_node *idx)
|
|||
|
|
{
|
|||
|
|
return (void *)((struct ubifs_branch *)idx->branches)->key;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_reported_space - calculate reported free space.
|
|||
|
|
* @c: the UBIFS file-system description object
|
|||
|
|
* @free: amount of free space
|
|||
|
|
*
|
|||
|
|
* This function calculates amount of free space which will be reported to
|
|||
|
|
* user-space. User-space application tend to expect that if the file-system
|
|||
|
|
* (e.g., via the 'statfs()' call) reports that it has N bytes available, they
|
|||
|
|
* are able to write a file of size N. UBIFS attaches node headers to each data
|
|||
|
|
* node and it has to write indexind nodes as well. This introduces additional
|
|||
|
|
* overhead, and UBIFS it has to report sligtly less free space to meet the
|
|||
|
|
* above expectetion.
|
|||
|
|
*
|
|||
|
|
* This function assumes free space is made up of uncompressed data nodes and
|
|||
|
|
* full index nodes (one per data node, doubled because we always allow enough
|
|||
|
|
* space to write the index twice).
|
|||
|
|
*
|
|||
|
|
* Note, the calculation is pessimistic, which means that most of the time
|
|||
|
|
* UBIFS reports less space than it actually has.
|
|||
|
|
*/
|
|||
|
|
static inline long long ubifs_reported_space(const struct ubifs_info *c,
|
|||
|
|
uint64_t free)
|
|||
|
|
{
|
|||
|
|
int divisor, factor;
|
|||
|
|
|
|||
|
|
divisor = UBIFS_MAX_DATA_NODE_SZ + (c->max_idx_node_sz << 1);
|
|||
|
|
factor = UBIFS_MAX_DATA_NODE_SZ - UBIFS_DATA_NODE_SZ;
|
|||
|
|
do_div(free, divisor);
|
|||
|
|
|
|||
|
|
return free * factor;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubifs_current_time - round current time to time granularity.
|
|||
|
|
* @inode: inode
|
|||
|
|
*/
|
|||
|
|
static inline struct timespec ubifs_current_time(struct inode *inode)
|
|||
|
|
{
|
|||
|
|
return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
|
|||
|
|
current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* __UBIFS_MISC_H__ */
|