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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5a528957e7
Use pr_fmt to prefix KBUILD_MODNAME to appropriate logging messages. Remove now unnecessary internal prefixes from formats. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
1172 lines
35 KiB
C
1172 lines
35 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/pagemap.h>
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#include <linux/crc32.h>
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#include <linux/compiler.h>
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#include "nodelist.h"
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#include "summary.h"
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#include "debug.h"
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#define DEFAULT_EMPTY_SCAN_SIZE 256
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#define noisy_printk(noise, fmt, ...) \
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do { \
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if (*(noise)) { \
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pr_notice(fmt, ##__VA_ARGS__); \
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(*(noise))--; \
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if (!(*(noise))) \
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pr_notice("Further such events for this erase block will not be printed\n"); \
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} \
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} while (0)
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static uint32_t pseudo_random;
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static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s);
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/* These helper functions _must_ increase ofs and also do the dirty/used space accounting.
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* Returning an error will abort the mount - bad checksums etc. should just mark the space
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* as dirty.
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*/
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static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s);
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static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s);
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static inline int min_free(struct jffs2_sb_info *c)
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{
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uint32_t min = 2 * sizeof(struct jffs2_raw_inode);
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#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
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if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize)
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return c->wbuf_pagesize;
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#endif
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return min;
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}
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static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) {
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if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
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return sector_size;
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else
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return DEFAULT_EMPTY_SCAN_SIZE;
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}
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static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
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{
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int ret;
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if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
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return ret;
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if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size)))
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return ret;
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/* Turned wasted size into dirty, since we apparently
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think it's recoverable now. */
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jeb->dirty_size += jeb->wasted_size;
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c->dirty_size += jeb->wasted_size;
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c->wasted_size -= jeb->wasted_size;
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jeb->wasted_size = 0;
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if (VERYDIRTY(c, jeb->dirty_size)) {
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list_add(&jeb->list, &c->very_dirty_list);
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} else {
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list_add(&jeb->list, &c->dirty_list);
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}
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return 0;
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}
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int jffs2_scan_medium(struct jffs2_sb_info *c)
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{
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int i, ret;
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uint32_t empty_blocks = 0, bad_blocks = 0;
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unsigned char *flashbuf = NULL;
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uint32_t buf_size = 0;
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struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
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#ifndef __ECOS
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size_t pointlen, try_size;
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ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen,
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(void **)&flashbuf, NULL);
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if (!ret && pointlen < c->mtd->size) {
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/* Don't muck about if it won't let us point to the whole flash */
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jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n",
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pointlen);
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mtd_unpoint(c->mtd, 0, pointlen);
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flashbuf = NULL;
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}
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if (ret && ret != -EOPNOTSUPP)
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jffs2_dbg(1, "MTD point failed %d\n", ret);
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#endif
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if (!flashbuf) {
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/* For NAND it's quicker to read a whole eraseblock at a time,
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apparently */
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if (jffs2_cleanmarker_oob(c))
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try_size = c->sector_size;
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else
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try_size = PAGE_SIZE;
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jffs2_dbg(1, "Trying to allocate readbuf of %zu "
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"bytes\n", try_size);
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flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size);
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if (!flashbuf)
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return -ENOMEM;
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jffs2_dbg(1, "Allocated readbuf of %zu bytes\n",
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try_size);
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buf_size = (uint32_t)try_size;
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}
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if (jffs2_sum_active()) {
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s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
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if (!s) {
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JFFS2_WARNING("Can't allocate memory for summary\n");
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ret = -ENOMEM;
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goto out;
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}
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}
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for (i=0; i<c->nr_blocks; i++) {
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struct jffs2_eraseblock *jeb = &c->blocks[i];
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cond_resched();
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/* reset summary info for next eraseblock scan */
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jffs2_sum_reset_collected(s);
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ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
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buf_size, s);
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if (ret < 0)
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goto out;
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jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
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/* Now decide which list to put it on */
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switch(ret) {
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case BLK_STATE_ALLFF:
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/*
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* Empty block. Since we can't be sure it
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* was entirely erased, we just queue it for erase
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* again. It will be marked as such when the erase
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* is complete. Meanwhile we still count it as empty
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* for later checks.
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*/
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empty_blocks++;
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list_add(&jeb->list, &c->erase_pending_list);
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c->nr_erasing_blocks++;
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break;
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case BLK_STATE_CLEANMARKER:
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/* Only a CLEANMARKER node is valid */
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if (!jeb->dirty_size) {
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/* It's actually free */
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list_add(&jeb->list, &c->free_list);
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c->nr_free_blocks++;
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} else {
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/* Dirt */
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jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n",
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jeb->offset);
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list_add(&jeb->list, &c->erase_pending_list);
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c->nr_erasing_blocks++;
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}
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break;
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case BLK_STATE_CLEAN:
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/* Full (or almost full) of clean data. Clean list */
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list_add(&jeb->list, &c->clean_list);
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break;
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case BLK_STATE_PARTDIRTY:
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/* Some data, but not full. Dirty list. */
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/* We want to remember the block with most free space
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and stick it in the 'nextblock' position to start writing to it. */
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if (jeb->free_size > min_free(c) &&
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(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
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/* Better candidate for the next writes to go to */
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if (c->nextblock) {
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ret = file_dirty(c, c->nextblock);
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if (ret)
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goto out;
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/* deleting summary information of the old nextblock */
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jffs2_sum_reset_collected(c->summary);
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}
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/* update collected summary information for the current nextblock */
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jffs2_sum_move_collected(c, s);
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jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n",
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__func__, jeb->offset);
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c->nextblock = jeb;
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} else {
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ret = file_dirty(c, jeb);
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if (ret)
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goto out;
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}
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break;
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case BLK_STATE_ALLDIRTY:
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/* Nothing valid - not even a clean marker. Needs erasing. */
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/* For now we just put it on the erasing list. We'll start the erases later */
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jffs2_dbg(1, "Erase block at 0x%08x is not formatted. It will be erased\n",
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jeb->offset);
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list_add(&jeb->list, &c->erase_pending_list);
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c->nr_erasing_blocks++;
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break;
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case BLK_STATE_BADBLOCK:
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jffs2_dbg(1, "Block at 0x%08x is bad\n", jeb->offset);
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list_add(&jeb->list, &c->bad_list);
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c->bad_size += c->sector_size;
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c->free_size -= c->sector_size;
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bad_blocks++;
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break;
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default:
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pr_warn("%s(): unknown block state\n", __func__);
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BUG();
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}
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}
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/* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
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if (c->nextblock && (c->nextblock->dirty_size)) {
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c->nextblock->wasted_size += c->nextblock->dirty_size;
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c->wasted_size += c->nextblock->dirty_size;
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c->dirty_size -= c->nextblock->dirty_size;
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c->nextblock->dirty_size = 0;
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}
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#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
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if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
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/* If we're going to start writing into a block which already
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contains data, and the end of the data isn't page-aligned,
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skip a little and align it. */
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uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;
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jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n",
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__func__, skip);
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jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
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jffs2_scan_dirty_space(c, c->nextblock, skip);
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}
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#endif
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if (c->nr_erasing_blocks) {
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if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
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pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
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pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",
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empty_blocks, bad_blocks, c->nr_blocks);
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ret = -EIO;
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goto out;
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}
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spin_lock(&c->erase_completion_lock);
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jffs2_garbage_collect_trigger(c);
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spin_unlock(&c->erase_completion_lock);
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}
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ret = 0;
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out:
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if (buf_size)
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kfree(flashbuf);
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#ifndef __ECOS
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else
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mtd_unpoint(c->mtd, 0, c->mtd->size);
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#endif
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kfree(s);
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return ret;
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}
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static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf,
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uint32_t ofs, uint32_t len)
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{
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int ret;
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size_t retlen;
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ret = jffs2_flash_read(c, ofs, len, &retlen, buf);
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if (ret) {
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jffs2_dbg(1, "mtd->read(0x%x bytes from 0x%x) returned %d\n",
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len, ofs, ret);
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return ret;
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}
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if (retlen < len) {
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jffs2_dbg(1, "Read at 0x%x gave only 0x%zx bytes\n",
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ofs, retlen);
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return -EIO;
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}
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return 0;
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}
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int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
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{
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if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size
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&& (!jeb->first_node || !ref_next(jeb->first_node)) )
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return BLK_STATE_CLEANMARKER;
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/* move blocks with max 4 byte dirty space to cleanlist */
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else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) {
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c->dirty_size -= jeb->dirty_size;
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c->wasted_size += jeb->dirty_size;
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jeb->wasted_size += jeb->dirty_size;
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jeb->dirty_size = 0;
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return BLK_STATE_CLEAN;
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} else if (jeb->used_size || jeb->unchecked_size)
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return BLK_STATE_PARTDIRTY;
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else
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return BLK_STATE_ALLDIRTY;
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}
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#ifdef CONFIG_JFFS2_FS_XATTR
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static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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struct jffs2_raw_xattr *rx, uint32_t ofs,
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struct jffs2_summary *s)
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{
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struct jffs2_xattr_datum *xd;
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uint32_t xid, version, totlen, crc;
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int err;
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crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4);
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if (crc != je32_to_cpu(rx->node_crc)) {
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JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
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ofs, je32_to_cpu(rx->node_crc), crc);
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if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
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return err;
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return 0;
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}
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xid = je32_to_cpu(rx->xid);
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version = je32_to_cpu(rx->version);
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totlen = PAD(sizeof(struct jffs2_raw_xattr)
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+ rx->name_len + 1 + je16_to_cpu(rx->value_len));
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if (totlen != je32_to_cpu(rx->totlen)) {
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JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
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ofs, je32_to_cpu(rx->totlen), totlen);
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if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
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return err;
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return 0;
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}
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xd = jffs2_setup_xattr_datum(c, xid, version);
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if (IS_ERR(xd))
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return PTR_ERR(xd);
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if (xd->version > version) {
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struct jffs2_raw_node_ref *raw
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= jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL);
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raw->next_in_ino = xd->node->next_in_ino;
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xd->node->next_in_ino = raw;
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} else {
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xd->version = version;
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xd->xprefix = rx->xprefix;
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xd->name_len = rx->name_len;
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xd->value_len = je16_to_cpu(rx->value_len);
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xd->data_crc = je32_to_cpu(rx->data_crc);
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jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd);
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}
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if (jffs2_sum_active())
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jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset);
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dbg_xattr("scanning xdatum at %#08x (xid=%u, version=%u)\n",
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ofs, xd->xid, xd->version);
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return 0;
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}
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static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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struct jffs2_raw_xref *rr, uint32_t ofs,
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struct jffs2_summary *s)
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{
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struct jffs2_xattr_ref *ref;
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uint32_t crc;
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int err;
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crc = crc32(0, rr, sizeof(*rr) - 4);
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if (crc != je32_to_cpu(rr->node_crc)) {
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JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
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ofs, je32_to_cpu(rr->node_crc), crc);
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if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen)))))
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return err;
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return 0;
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}
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if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) {
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JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n",
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ofs, je32_to_cpu(rr->totlen),
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PAD(sizeof(struct jffs2_raw_xref)));
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if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen))))
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return err;
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return 0;
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}
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ref = jffs2_alloc_xattr_ref();
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if (!ref)
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return -ENOMEM;
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/* BEFORE jffs2_build_xattr_subsystem() called,
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* and AFTER xattr_ref is marked as a dead xref,
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* ref->xid is used to store 32bit xid, xd is not used
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* ref->ino is used to store 32bit inode-number, ic is not used
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* Thoes variables are declared as union, thus using those
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* are exclusive. In a similar way, ref->next is temporarily
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* used to chain all xattr_ref object. It's re-chained to
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* jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly.
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*/
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ref->ino = je32_to_cpu(rr->ino);
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ref->xid = je32_to_cpu(rr->xid);
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ref->xseqno = je32_to_cpu(rr->xseqno);
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if (ref->xseqno > c->highest_xseqno)
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c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
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ref->next = c->xref_temp;
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c->xref_temp = ref;
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jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref);
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if (jffs2_sum_active())
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jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset);
|
|
dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n",
|
|
ofs, ref->xid, ref->ino);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into
|
|
the flash, XIP-style */
|
|
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
|
|
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
|
|
struct jffs2_unknown_node *node;
|
|
struct jffs2_unknown_node crcnode;
|
|
uint32_t ofs, prevofs, max_ofs;
|
|
uint32_t hdr_crc, buf_ofs, buf_len;
|
|
int err;
|
|
int noise = 0;
|
|
|
|
|
|
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
|
|
int cleanmarkerfound = 0;
|
|
#endif
|
|
|
|
ofs = jeb->offset;
|
|
prevofs = jeb->offset - 1;
|
|
|
|
jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs);
|
|
|
|
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
|
|
if (jffs2_cleanmarker_oob(c)) {
|
|
int ret;
|
|
|
|
if (mtd_block_isbad(c->mtd, jeb->offset))
|
|
return BLK_STATE_BADBLOCK;
|
|
|
|
ret = jffs2_check_nand_cleanmarker(c, jeb);
|
|
jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret);
|
|
|
|
/* Even if it's not found, we still scan to see
|
|
if the block is empty. We use this information
|
|
to decide whether to erase it or not. */
|
|
switch (ret) {
|
|
case 0: cleanmarkerfound = 1; break;
|
|
case 1: break;
|
|
default: return ret;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (jffs2_sum_active()) {
|
|
struct jffs2_sum_marker *sm;
|
|
void *sumptr = NULL;
|
|
uint32_t sumlen;
|
|
|
|
if (!buf_size) {
|
|
/* XIP case. Just look, point at the summary if it's there */
|
|
sm = (void *)buf + c->sector_size - sizeof(*sm);
|
|
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
|
|
sumptr = buf + je32_to_cpu(sm->offset);
|
|
sumlen = c->sector_size - je32_to_cpu(sm->offset);
|
|
}
|
|
} else {
|
|
/* If NAND flash, read a whole page of it. Else just the end */
|
|
if (c->wbuf_pagesize)
|
|
buf_len = c->wbuf_pagesize;
|
|
else
|
|
buf_len = sizeof(*sm);
|
|
|
|
/* Read as much as we want into the _end_ of the preallocated buffer */
|
|
err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
|
|
jeb->offset + c->sector_size - buf_len,
|
|
buf_len);
|
|
if (err)
|
|
return err;
|
|
|
|
sm = (void *)buf + buf_size - sizeof(*sm);
|
|
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
|
|
sumlen = c->sector_size - je32_to_cpu(sm->offset);
|
|
sumptr = buf + buf_size - sumlen;
|
|
|
|
/* Now, make sure the summary itself is available */
|
|
if (sumlen > buf_size) {
|
|
/* Need to kmalloc for this. */
|
|
sumptr = kmalloc(sumlen, GFP_KERNEL);
|
|
if (!sumptr)
|
|
return -ENOMEM;
|
|
memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
|
|
}
|
|
if (buf_len < sumlen) {
|
|
/* Need to read more so that the entire summary node is present */
|
|
err = jffs2_fill_scan_buf(c, sumptr,
|
|
jeb->offset + c->sector_size - sumlen,
|
|
sumlen - buf_len);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
if (sumptr) {
|
|
err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);
|
|
|
|
if (buf_size && sumlen > buf_size)
|
|
kfree(sumptr);
|
|
/* If it returns with a real error, bail.
|
|
If it returns positive, that's a block classification
|
|
(i.e. BLK_STATE_xxx) so return that too.
|
|
If it returns zero, fall through to full scan. */
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
buf_ofs = jeb->offset;
|
|
|
|
if (!buf_size) {
|
|
/* This is the XIP case -- we're reading _directly_ from the flash chip */
|
|
buf_len = c->sector_size;
|
|
} else {
|
|
buf_len = EMPTY_SCAN_SIZE(c->sector_size);
|
|
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
|
|
ofs = 0;
|
|
max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
|
|
/* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */
|
|
while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
|
|
ofs += 4;
|
|
|
|
if (ofs == max_ofs) {
|
|
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
|
|
if (jffs2_cleanmarker_oob(c)) {
|
|
/* scan oob, take care of cleanmarker */
|
|
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
|
|
jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n",
|
|
ret);
|
|
switch (ret) {
|
|
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
|
|
case 1: return BLK_STATE_ALLDIRTY;
|
|
default: return ret;
|
|
}
|
|
}
|
|
#endif
|
|
jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n",
|
|
jeb->offset);
|
|
if (c->cleanmarker_size == 0)
|
|
return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
|
|
else
|
|
return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
|
|
}
|
|
if (ofs) {
|
|
jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset,
|
|
jeb->offset + ofs);
|
|
if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
|
|
return err;
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
|
|
return err;
|
|
}
|
|
|
|
/* Now ofs is a complete physical flash offset as it always was... */
|
|
ofs += jeb->offset;
|
|
|
|
noise = 10;
|
|
|
|
dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
|
|
|
|
scan_more:
|
|
while(ofs < jeb->offset + c->sector_size) {
|
|
|
|
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
|
|
|
|
/* Make sure there are node refs available for use */
|
|
err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
|
|
if (err)
|
|
return err;
|
|
|
|
cond_resched();
|
|
|
|
if (ofs & 3) {
|
|
pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs);
|
|
ofs = PAD(ofs);
|
|
continue;
|
|
}
|
|
if (ofs == prevofs) {
|
|
pr_warn("ofs 0x%08x has already been seen. Skipping\n",
|
|
ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
prevofs = ofs;
|
|
|
|
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
|
|
jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n",
|
|
sizeof(struct jffs2_unknown_node),
|
|
jeb->offset, c->sector_size, ofs,
|
|
sizeof(*node));
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
|
|
return err;
|
|
break;
|
|
}
|
|
|
|
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
|
|
sizeof(struct jffs2_unknown_node),
|
|
buf_len, ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
}
|
|
|
|
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
|
|
|
|
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
|
|
uint32_t inbuf_ofs;
|
|
uint32_t empty_start, scan_end;
|
|
|
|
empty_start = ofs;
|
|
ofs += 4;
|
|
scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);
|
|
|
|
jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs);
|
|
more_empty:
|
|
inbuf_ofs = ofs - buf_ofs;
|
|
while (inbuf_ofs < scan_end) {
|
|
if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
|
|
pr_warn("Empty flash at 0x%08x ends at 0x%08x\n",
|
|
empty_start, ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
|
|
return err;
|
|
goto scan_more;
|
|
}
|
|
|
|
inbuf_ofs+=4;
|
|
ofs += 4;
|
|
}
|
|
/* Ran off end. */
|
|
jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n",
|
|
ofs);
|
|
|
|
/* If we're only checking the beginning of a block with a cleanmarker,
|
|
bail now */
|
|
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
|
|
c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
|
|
jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n",
|
|
EMPTY_SCAN_SIZE(c->sector_size));
|
|
return BLK_STATE_CLEANMARKER;
|
|
}
|
|
if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */
|
|
scan_end = buf_len;
|
|
goto more_empty;
|
|
}
|
|
|
|
/* See how much more there is to read in this eraseblock... */
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
if (!buf_len) {
|
|
/* No more to read. Break out of main loop without marking
|
|
this range of empty space as dirty (because it's not) */
|
|
jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n",
|
|
empty_start);
|
|
break;
|
|
}
|
|
/* point never reaches here */
|
|
scan_end = buf_len;
|
|
jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n",
|
|
buf_len, ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
goto more_empty;
|
|
}
|
|
|
|
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
|
|
pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n",
|
|
ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
|
|
jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
|
|
pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs);
|
|
pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n");
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
|
|
/* OK. We're out of possibilities. Whinge and move on */
|
|
noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
|
|
__func__,
|
|
JFFS2_MAGIC_BITMASK, ofs,
|
|
je16_to_cpu(node->magic));
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
/* We seem to have a node of sorts. Check the CRC */
|
|
crcnode.magic = node->magic;
|
|
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
|
|
crcnode.totlen = node->totlen;
|
|
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
|
|
|
|
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
|
|
noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
|
|
__func__,
|
|
ofs, je16_to_cpu(node->magic),
|
|
je16_to_cpu(node->nodetype),
|
|
je32_to_cpu(node->totlen),
|
|
je32_to_cpu(node->hdr_crc),
|
|
hdr_crc);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
|
|
if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
|
|
/* Eep. Node goes over the end of the erase block. */
|
|
pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
|
|
ofs, je32_to_cpu(node->totlen));
|
|
pr_warn("Perhaps the file system was created with the wrong erase size?\n");
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
|
|
return err;
|
|
ofs += 4;
|
|
continue;
|
|
}
|
|
|
|
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
|
|
/* Wheee. This is an obsoleted node */
|
|
jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n",
|
|
ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
continue;
|
|
}
|
|
|
|
switch(je16_to_cpu(node->nodetype)) {
|
|
case JFFS2_NODETYPE_INODE:
|
|
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
|
|
sizeof(struct jffs2_raw_inode),
|
|
buf_len, ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
node = (void *)buf;
|
|
}
|
|
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
|
|
if (err) return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
|
|
case JFFS2_NODETYPE_DIRENT:
|
|
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
|
|
je32_to_cpu(node->totlen), buf_len,
|
|
ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
node = (void *)buf;
|
|
}
|
|
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
|
|
if (err) return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
|
|
#ifdef CONFIG_JFFS2_FS_XATTR
|
|
case JFFS2_NODETYPE_XATTR:
|
|
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n",
|
|
je32_to_cpu(node->totlen), buf_len,
|
|
ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
node = (void *)buf;
|
|
}
|
|
err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
|
|
if (err)
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
case JFFS2_NODETYPE_XREF:
|
|
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
|
|
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
|
|
jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n",
|
|
je32_to_cpu(node->totlen), buf_len,
|
|
ofs);
|
|
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
|
|
if (err)
|
|
return err;
|
|
buf_ofs = ofs;
|
|
node = (void *)buf;
|
|
}
|
|
err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
|
|
if (err)
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
#endif /* CONFIG_JFFS2_FS_XATTR */
|
|
|
|
case JFFS2_NODETYPE_CLEANMARKER:
|
|
jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs);
|
|
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
|
|
pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
|
|
ofs, je32_to_cpu(node->totlen),
|
|
c->cleanmarker_size);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
|
|
return err;
|
|
ofs += PAD(sizeof(struct jffs2_unknown_node));
|
|
} else if (jeb->first_node) {
|
|
pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n",
|
|
ofs, jeb->offset);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
|
|
return err;
|
|
ofs += PAD(sizeof(struct jffs2_unknown_node));
|
|
} else {
|
|
jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);
|
|
|
|
ofs += PAD(c->cleanmarker_size);
|
|
}
|
|
break;
|
|
|
|
case JFFS2_NODETYPE_PADDING:
|
|
if (jffs2_sum_active())
|
|
jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
|
|
default:
|
|
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
|
|
case JFFS2_FEATURE_ROCOMPAT:
|
|
pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n",
|
|
je16_to_cpu(node->nodetype), ofs);
|
|
c->flags |= JFFS2_SB_FLAG_RO;
|
|
if (!(jffs2_is_readonly(c)))
|
|
return -EROFS;
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
|
|
case JFFS2_FEATURE_INCOMPAT:
|
|
pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n",
|
|
je16_to_cpu(node->nodetype), ofs);
|
|
return -EINVAL;
|
|
|
|
case JFFS2_FEATURE_RWCOMPAT_DELETE:
|
|
jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
|
|
je16_to_cpu(node->nodetype), ofs);
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
|
|
return err;
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
|
|
case JFFS2_FEATURE_RWCOMPAT_COPY: {
|
|
jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
|
|
je16_to_cpu(node->nodetype), ofs);
|
|
|
|
jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);
|
|
|
|
/* We can't summarise nodes we don't grok */
|
|
jffs2_sum_disable_collecting(s);
|
|
ofs += PAD(je32_to_cpu(node->totlen));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (jffs2_sum_active()) {
|
|
if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
|
|
dbg_summary("There is not enough space for "
|
|
"summary information, disabling for this jeb!\n");
|
|
jffs2_sum_disable_collecting(s);
|
|
}
|
|
}
|
|
|
|
jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
|
|
jeb->offset, jeb->free_size, jeb->dirty_size,
|
|
jeb->unchecked_size, jeb->used_size, jeb->wasted_size);
|
|
|
|
/* mark_node_obsolete can add to wasted !! */
|
|
if (jeb->wasted_size) {
|
|
jeb->dirty_size += jeb->wasted_size;
|
|
c->dirty_size += jeb->wasted_size;
|
|
c->wasted_size -= jeb->wasted_size;
|
|
jeb->wasted_size = 0;
|
|
}
|
|
|
|
return jffs2_scan_classify_jeb(c, jeb);
|
|
}
|
|
|
|
struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
|
|
{
|
|
struct jffs2_inode_cache *ic;
|
|
|
|
ic = jffs2_get_ino_cache(c, ino);
|
|
if (ic)
|
|
return ic;
|
|
|
|
if (ino > c->highest_ino)
|
|
c->highest_ino = ino;
|
|
|
|
ic = jffs2_alloc_inode_cache();
|
|
if (!ic) {
|
|
pr_notice("%s(): allocation of inode cache failed\n", __func__);
|
|
return NULL;
|
|
}
|
|
memset(ic, 0, sizeof(*ic));
|
|
|
|
ic->ino = ino;
|
|
ic->nodes = (void *)ic;
|
|
jffs2_add_ino_cache(c, ic);
|
|
if (ino == 1)
|
|
ic->pino_nlink = 1;
|
|
return ic;
|
|
}
|
|
|
|
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
|
|
struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
|
|
{
|
|
struct jffs2_inode_cache *ic;
|
|
uint32_t crc, ino = je32_to_cpu(ri->ino);
|
|
|
|
jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs);
|
|
|
|
/* We do very little here now. Just check the ino# to which we should attribute
|
|
this node; we can do all the CRC checking etc. later. There's a tradeoff here --
|
|
we used to scan the flash once only, reading everything we want from it into
|
|
memory, then building all our in-core data structures and freeing the extra
|
|
information. Now we allow the first part of the mount to complete a lot quicker,
|
|
but we have to go _back_ to the flash in order to finish the CRC checking, etc.
|
|
Which means that the _full_ amount of time to get to proper write mode with GC
|
|
operational may actually be _longer_ than before. Sucks to be me. */
|
|
|
|
/* Check the node CRC in any case. */
|
|
crc = crc32(0, ri, sizeof(*ri)-8);
|
|
if (crc != je32_to_cpu(ri->node_crc)) {
|
|
pr_notice("%s(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
|
|
__func__, ofs, je32_to_cpu(ri->node_crc), crc);
|
|
/*
|
|
* We believe totlen because the CRC on the node
|
|
* _header_ was OK, just the node itself failed.
|
|
*/
|
|
return jffs2_scan_dirty_space(c, jeb,
|
|
PAD(je32_to_cpu(ri->totlen)));
|
|
}
|
|
|
|
ic = jffs2_get_ino_cache(c, ino);
|
|
if (!ic) {
|
|
ic = jffs2_scan_make_ino_cache(c, ino);
|
|
if (!ic)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Wheee. It worked */
|
|
jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic);
|
|
|
|
jffs2_dbg(1, "Node is ino #%u, version %d. Range 0x%x-0x%x\n",
|
|
je32_to_cpu(ri->ino), je32_to_cpu(ri->version),
|
|
je32_to_cpu(ri->offset),
|
|
je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize));
|
|
|
|
pseudo_random += je32_to_cpu(ri->version);
|
|
|
|
if (jffs2_sum_active()) {
|
|
jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
|
|
struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s)
|
|
{
|
|
struct jffs2_full_dirent *fd;
|
|
struct jffs2_inode_cache *ic;
|
|
uint32_t checkedlen;
|
|
uint32_t crc;
|
|
int err;
|
|
|
|
jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs);
|
|
|
|
/* We don't get here unless the node is still valid, so we don't have to
|
|
mask in the ACCURATE bit any more. */
|
|
crc = crc32(0, rd, sizeof(*rd)-8);
|
|
|
|
if (crc != je32_to_cpu(rd->node_crc)) {
|
|
pr_notice("%s(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
|
|
__func__, ofs, je32_to_cpu(rd->node_crc), crc);
|
|
/* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen)))))
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
pseudo_random += je32_to_cpu(rd->version);
|
|
|
|
/* Should never happen. Did. (OLPC trac #4184)*/
|
|
checkedlen = strnlen(rd->name, rd->nsize);
|
|
if (checkedlen < rd->nsize) {
|
|
pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
|
|
ofs, checkedlen);
|
|
}
|
|
fd = jffs2_alloc_full_dirent(checkedlen+1);
|
|
if (!fd) {
|
|
return -ENOMEM;
|
|
}
|
|
memcpy(&fd->name, rd->name, checkedlen);
|
|
fd->name[checkedlen] = 0;
|
|
|
|
crc = crc32(0, fd->name, rd->nsize);
|
|
if (crc != je32_to_cpu(rd->name_crc)) {
|
|
pr_notice("%s(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
|
|
__func__, ofs, je32_to_cpu(rd->name_crc), crc);
|
|
jffs2_dbg(1, "Name for which CRC failed is (now) '%s', ino #%d\n",
|
|
fd->name, je32_to_cpu(rd->ino));
|
|
jffs2_free_full_dirent(fd);
|
|
/* FIXME: Why do we believe totlen? */
|
|
/* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */
|
|
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen)))))
|
|
return err;
|
|
return 0;
|
|
}
|
|
ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino));
|
|
if (!ic) {
|
|
jffs2_free_full_dirent(fd);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd),
|
|
PAD(je32_to_cpu(rd->totlen)), ic);
|
|
|
|
fd->next = NULL;
|
|
fd->version = je32_to_cpu(rd->version);
|
|
fd->ino = je32_to_cpu(rd->ino);
|
|
fd->nhash = full_name_hash(fd->name, checkedlen);
|
|
fd->type = rd->type;
|
|
jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
|
|
|
|
if (jffs2_sum_active()) {
|
|
jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int count_list(struct list_head *l)
|
|
{
|
|
uint32_t count = 0;
|
|
struct list_head *tmp;
|
|
|
|
list_for_each(tmp, l) {
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* Note: This breaks if list_empty(head). I don't care. You
|
|
might, if you copy this code and use it elsewhere :) */
|
|
static void rotate_list(struct list_head *head, uint32_t count)
|
|
{
|
|
struct list_head *n = head->next;
|
|
|
|
list_del(head);
|
|
while(count--) {
|
|
n = n->next;
|
|
}
|
|
list_add(head, n);
|
|
}
|
|
|
|
void jffs2_rotate_lists(struct jffs2_sb_info *c)
|
|
{
|
|
uint32_t x;
|
|
uint32_t rotateby;
|
|
|
|
x = count_list(&c->clean_list);
|
|
if (x) {
|
|
rotateby = pseudo_random % x;
|
|
rotate_list((&c->clean_list), rotateby);
|
|
}
|
|
|
|
x = count_list(&c->very_dirty_list);
|
|
if (x) {
|
|
rotateby = pseudo_random % x;
|
|
rotate_list((&c->very_dirty_list), rotateby);
|
|
}
|
|
|
|
x = count_list(&c->dirty_list);
|
|
if (x) {
|
|
rotateby = pseudo_random % x;
|
|
rotate_list((&c->dirty_list), rotateby);
|
|
}
|
|
|
|
x = count_list(&c->erasable_list);
|
|
if (x) {
|
|
rotateby = pseudo_random % x;
|
|
rotate_list((&c->erasable_list), rotateby);
|
|
}
|
|
|
|
if (c->nr_erasing_blocks) {
|
|
rotateby = pseudo_random % c->nr_erasing_blocks;
|
|
rotate_list((&c->erase_pending_list), rotateby);
|
|
}
|
|
|
|
if (c->nr_free_blocks) {
|
|
rotateby = pseudo_random % c->nr_free_blocks;
|
|
rotate_list((&c->free_list), rotateby);
|
|
}
|
|
}
|