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877 lines
24 KiB
877 lines
24 KiB
/* |
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* JFFS2 -- Journalling Flash File System, Version 2. |
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* |
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* Copyright © 2004 Ferenc Havasi <[email protected]>, |
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* Zoltan Sogor <[email protected]>, |
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* Patrik Kluba <[email protected]>, |
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* University of Szeged, Hungary |
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* 2006 KaiGai Kohei <[email protected]> |
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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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/kernel.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 <linux/vmalloc.h> |
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#include "nodelist.h" |
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#include "debug.h" |
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int jffs2_sum_init(struct jffs2_sb_info *c) |
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{ |
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uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE); |
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c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); |
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if (!c->summary) { |
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JFFS2_WARNING("Can't allocate memory for summary information!\n"); |
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return -ENOMEM; |
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} |
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c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL); |
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if (!c->summary->sum_buf) { |
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JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); |
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kfree(c->summary); |
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return -ENOMEM; |
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} |
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dbg_summary("returned successfully\n"); |
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return 0; |
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} |
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void jffs2_sum_exit(struct jffs2_sb_info *c) |
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{ |
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dbg_summary("called\n"); |
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jffs2_sum_disable_collecting(c->summary); |
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kfree(c->summary->sum_buf); |
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c->summary->sum_buf = NULL; |
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kfree(c->summary); |
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c->summary = NULL; |
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} |
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static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) |
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{ |
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if (!s->sum_list_head) |
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s->sum_list_head = (union jffs2_sum_mem *) item; |
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if (s->sum_list_tail) |
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s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; |
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s->sum_list_tail = (union jffs2_sum_mem *) item; |
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|
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switch (je16_to_cpu(item->u.nodetype)) { |
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case JFFS2_NODETYPE_INODE: |
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s->sum_size += JFFS2_SUMMARY_INODE_SIZE; |
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s->sum_num++; |
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dbg_summary("inode (%u) added to summary\n", |
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je32_to_cpu(item->i.inode)); |
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break; |
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case JFFS2_NODETYPE_DIRENT: |
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s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); |
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s->sum_num++; |
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dbg_summary("dirent (%u) added to summary\n", |
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je32_to_cpu(item->d.ino)); |
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break; |
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#ifdef CONFIG_JFFS2_FS_XATTR |
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case JFFS2_NODETYPE_XATTR: |
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s->sum_size += JFFS2_SUMMARY_XATTR_SIZE; |
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s->sum_num++; |
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dbg_summary("xattr (xid=%u, version=%u) added to summary\n", |
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je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version)); |
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break; |
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case JFFS2_NODETYPE_XREF: |
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s->sum_size += JFFS2_SUMMARY_XREF_SIZE; |
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s->sum_num++; |
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dbg_summary("xref added to summary\n"); |
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break; |
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#endif |
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default: |
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JFFS2_WARNING("UNKNOWN node type %u\n", |
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je16_to_cpu(item->u.nodetype)); |
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return 1; |
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} |
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return 0; |
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} |
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/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ |
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int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) |
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{ |
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dbg_summary("called with %u\n", size); |
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s->sum_padded += size; |
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return 0; |
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} |
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int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, |
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uint32_t ofs) |
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{ |
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struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); |
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if (!temp) |
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return -ENOMEM; |
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temp->nodetype = ri->nodetype; |
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temp->inode = ri->ino; |
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temp->version = ri->version; |
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temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */ |
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temp->totlen = ri->totlen; |
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temp->next = NULL; |
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return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); |
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} |
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int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, |
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uint32_t ofs) |
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{ |
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struct jffs2_sum_dirent_mem *temp = |
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kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); |
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if (!temp) |
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return -ENOMEM; |
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temp->nodetype = rd->nodetype; |
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temp->totlen = rd->totlen; |
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temp->offset = cpu_to_je32(ofs); /* relative from the beginning of the jeb */ |
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temp->pino = rd->pino; |
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temp->version = rd->version; |
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temp->ino = rd->ino; |
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temp->nsize = rd->nsize; |
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temp->type = rd->type; |
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temp->next = NULL; |
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memcpy(temp->name, rd->name, rd->nsize); |
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return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); |
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} |
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#ifdef CONFIG_JFFS2_FS_XATTR |
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int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs) |
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{ |
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struct jffs2_sum_xattr_mem *temp; |
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temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); |
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if (!temp) |
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return -ENOMEM; |
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temp->nodetype = rx->nodetype; |
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temp->xid = rx->xid; |
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temp->version = rx->version; |
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temp->offset = cpu_to_je32(ofs); |
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temp->totlen = rx->totlen; |
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temp->next = NULL; |
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return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); |
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} |
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int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs) |
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{ |
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struct jffs2_sum_xref_mem *temp; |
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temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); |
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if (!temp) |
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return -ENOMEM; |
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temp->nodetype = rr->nodetype; |
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temp->offset = cpu_to_je32(ofs); |
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temp->next = NULL; |
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return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); |
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} |
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#endif |
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/* Cleanup every collected summary information */ |
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static void jffs2_sum_clean_collected(struct jffs2_summary *s) |
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{ |
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union jffs2_sum_mem *temp; |
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if (!s->sum_list_head) { |
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dbg_summary("already empty\n"); |
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} |
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while (s->sum_list_head) { |
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temp = s->sum_list_head; |
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s->sum_list_head = s->sum_list_head->u.next; |
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kfree(temp); |
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} |
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s->sum_list_tail = NULL; |
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s->sum_padded = 0; |
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s->sum_num = 0; |
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} |
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void jffs2_sum_reset_collected(struct jffs2_summary *s) |
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{ |
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dbg_summary("called\n"); |
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jffs2_sum_clean_collected(s); |
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s->sum_size = 0; |
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} |
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void jffs2_sum_disable_collecting(struct jffs2_summary *s) |
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{ |
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dbg_summary("called\n"); |
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jffs2_sum_clean_collected(s); |
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s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; |
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} |
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int jffs2_sum_is_disabled(struct jffs2_summary *s) |
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{ |
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return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); |
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} |
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/* Move the collected summary information into sb (called from scan.c) */ |
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void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) |
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{ |
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dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", |
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c->summary->sum_size, c->summary->sum_num, |
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s->sum_size, s->sum_num); |
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c->summary->sum_size = s->sum_size; |
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c->summary->sum_num = s->sum_num; |
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c->summary->sum_padded = s->sum_padded; |
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c->summary->sum_list_head = s->sum_list_head; |
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c->summary->sum_list_tail = s->sum_list_tail; |
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s->sum_list_head = s->sum_list_tail = NULL; |
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} |
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/* Called from wbuf.c to collect writed node info */ |
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int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, |
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unsigned long count, uint32_t ofs) |
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{ |
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union jffs2_node_union *node; |
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struct jffs2_eraseblock *jeb; |
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if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) { |
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dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n"); |
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return 0; |
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} |
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node = invecs[0].iov_base; |
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jeb = &c->blocks[ofs / c->sector_size]; |
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ofs -= jeb->offset; |
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switch (je16_to_cpu(node->u.nodetype)) { |
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case JFFS2_NODETYPE_INODE: { |
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struct jffs2_sum_inode_mem *temp = |
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kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); |
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if (!temp) |
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goto no_mem; |
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temp->nodetype = node->i.nodetype; |
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temp->inode = node->i.ino; |
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temp->version = node->i.version; |
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temp->offset = cpu_to_je32(ofs); |
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temp->totlen = node->i.totlen; |
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temp->next = NULL; |
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return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); |
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} |
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case JFFS2_NODETYPE_DIRENT: { |
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struct jffs2_sum_dirent_mem *temp = |
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kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); |
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if (!temp) |
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goto no_mem; |
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temp->nodetype = node->d.nodetype; |
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temp->totlen = node->d.totlen; |
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temp->offset = cpu_to_je32(ofs); |
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temp->pino = node->d.pino; |
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temp->version = node->d.version; |
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temp->ino = node->d.ino; |
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temp->nsize = node->d.nsize; |
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temp->type = node->d.type; |
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temp->next = NULL; |
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switch (count) { |
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case 1: |
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memcpy(temp->name,node->d.name,node->d.nsize); |
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break; |
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case 2: |
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memcpy(temp->name,invecs[1].iov_base,node->d.nsize); |
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break; |
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default: |
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BUG(); /* impossible count value */ |
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break; |
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} |
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return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); |
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} |
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#ifdef CONFIG_JFFS2_FS_XATTR |
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case JFFS2_NODETYPE_XATTR: { |
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struct jffs2_sum_xattr_mem *temp; |
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temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); |
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if (!temp) |
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goto no_mem; |
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temp->nodetype = node->x.nodetype; |
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temp->xid = node->x.xid; |
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temp->version = node->x.version; |
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temp->totlen = node->x.totlen; |
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temp->offset = cpu_to_je32(ofs); |
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temp->next = NULL; |
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return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); |
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} |
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case JFFS2_NODETYPE_XREF: { |
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struct jffs2_sum_xref_mem *temp; |
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temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); |
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if (!temp) |
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goto no_mem; |
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temp->nodetype = node->r.nodetype; |
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temp->offset = cpu_to_je32(ofs); |
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temp->next = NULL; |
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return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); |
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} |
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#endif |
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case JFFS2_NODETYPE_PADDING: |
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dbg_summary("node PADDING\n"); |
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c->summary->sum_padded += je32_to_cpu(node->u.totlen); |
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break; |
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case JFFS2_NODETYPE_CLEANMARKER: |
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dbg_summary("node CLEANMARKER\n"); |
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break; |
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case JFFS2_NODETYPE_SUMMARY: |
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dbg_summary("node SUMMARY\n"); |
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break; |
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default: |
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/* If you implement a new node type you should also implement |
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summary support for it or disable summary. |
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*/ |
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BUG(); |
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break; |
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} |
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return 0; |
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no_mem: |
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JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); |
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return -ENOMEM; |
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} |
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static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, |
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struct jffs2_eraseblock *jeb, |
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uint32_t ofs, uint32_t len, |
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struct jffs2_inode_cache *ic) |
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{ |
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/* If there was a gap, mark it dirty */ |
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if ((ofs & ~3) > c->sector_size - jeb->free_size) { |
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/* Ew. Summary doesn't actually tell us explicitly about dirty space */ |
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jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); |
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} |
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return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); |
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} |
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/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ |
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static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
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struct jffs2_raw_summary *summary, uint32_t *pseudo_random) |
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{ |
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struct jffs2_inode_cache *ic; |
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struct jffs2_full_dirent *fd; |
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void *sp; |
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int i, ino; |
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int err; |
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sp = summary->sum; |
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for (i=0; i<je32_to_cpu(summary->sum_num); i++) { |
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dbg_summary("processing summary index %d\n", i); |
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cond_resched(); |
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/* Make sure there's a spare ref for dirty space */ |
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err = jffs2_prealloc_raw_node_refs(c, jeb, 2); |
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if (err) |
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return err; |
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switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { |
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case JFFS2_NODETYPE_INODE: { |
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struct jffs2_sum_inode_flash *spi; |
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spi = sp; |
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ino = je32_to_cpu(spi->inode); |
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dbg_summary("Inode at 0x%08x-0x%08x\n", |
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jeb->offset + je32_to_cpu(spi->offset), |
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jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); |
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ic = jffs2_scan_make_ino_cache(c, ino); |
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if (!ic) { |
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JFFS2_NOTICE("scan_make_ino_cache failed\n"); |
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return -ENOMEM; |
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} |
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sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, |
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PAD(je32_to_cpu(spi->totlen)), ic); |
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*pseudo_random += je32_to_cpu(spi->version); |
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sp += JFFS2_SUMMARY_INODE_SIZE; |
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break; |
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} |
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case JFFS2_NODETYPE_DIRENT: { |
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struct jffs2_sum_dirent_flash *spd; |
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int checkedlen; |
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spd = sp; |
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dbg_summary("Dirent at 0x%08x-0x%08x\n", |
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jeb->offset + je32_to_cpu(spd->offset), |
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jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); |
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/* This should never happen, but https://dev.laptop.org/ticket/4184 */ |
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checkedlen = strnlen(spd->name, spd->nsize); |
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if (!checkedlen) { |
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pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n", |
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jeb->offset + |
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je32_to_cpu(spd->offset)); |
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return -EIO; |
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} |
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if (checkedlen < spd->nsize) { |
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pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", |
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jeb->offset + |
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je32_to_cpu(spd->offset), |
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checkedlen); |
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} |
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fd = jffs2_alloc_full_dirent(checkedlen+1); |
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if (!fd) |
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return -ENOMEM; |
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memcpy(&fd->name, spd->name, checkedlen); |
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fd->name[checkedlen] = 0; |
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ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); |
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if (!ic) { |
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jffs2_free_full_dirent(fd); |
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return -ENOMEM; |
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} |
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fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, |
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PAD(je32_to_cpu(spd->totlen)), ic); |
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fd->next = NULL; |
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fd->version = je32_to_cpu(spd->version); |
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fd->ino = je32_to_cpu(spd->ino); |
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fd->nhash = full_name_hash(NULL, fd->name, checkedlen); |
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fd->type = spd->type; |
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jffs2_add_fd_to_list(c, fd, &ic->scan_dents); |
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*pseudo_random += je32_to_cpu(spd->version); |
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sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); |
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break; |
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} |
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#ifdef CONFIG_JFFS2_FS_XATTR |
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case JFFS2_NODETYPE_XATTR: { |
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struct jffs2_xattr_datum *xd; |
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struct jffs2_sum_xattr_flash *spx; |
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spx = (struct jffs2_sum_xattr_flash *)sp; |
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dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", |
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jeb->offset + je32_to_cpu(spx->offset), |
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jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), |
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je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); |
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xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), |
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je32_to_cpu(spx->version)); |
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if (IS_ERR(xd)) |
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return PTR_ERR(xd); |
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if (xd->version > je32_to_cpu(spx->version)) { |
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/* node is not the newest one */ |
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struct jffs2_raw_node_ref *raw |
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= sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, |
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PAD(je32_to_cpu(spx->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 = je32_to_cpu(spx->version); |
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sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, |
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PAD(je32_to_cpu(spx->totlen)), (void *)xd); |
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} |
|
*pseudo_random += je32_to_cpu(spx->xid); |
|
sp += JFFS2_SUMMARY_XATTR_SIZE; |
|
|
|
break; |
|
} |
|
case JFFS2_NODETYPE_XREF: { |
|
struct jffs2_xattr_ref *ref; |
|
struct jffs2_sum_xref_flash *spr; |
|
|
|
spr = (struct jffs2_sum_xref_flash *)sp; |
|
dbg_summary("xref at %#08x-%#08x\n", |
|
jeb->offset + je32_to_cpu(spr->offset), |
|
jeb->offset + je32_to_cpu(spr->offset) + |
|
(uint32_t)PAD(sizeof(struct jffs2_raw_xref))); |
|
|
|
ref = jffs2_alloc_xattr_ref(); |
|
if (!ref) { |
|
JFFS2_NOTICE("allocation of xattr_datum failed\n"); |
|
return -ENOMEM; |
|
} |
|
ref->next = c->xref_temp; |
|
c->xref_temp = ref; |
|
|
|
sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, |
|
PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); |
|
|
|
*pseudo_random += ref->node->flash_offset; |
|
sp += JFFS2_SUMMARY_XREF_SIZE; |
|
|
|
break; |
|
} |
|
#endif |
|
default : { |
|
uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); |
|
JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); |
|
if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) |
|
return -EIO; |
|
|
|
/* For compatible node types, just fall back to the full scan */ |
|
c->wasted_size -= jeb->wasted_size; |
|
c->free_size += c->sector_size - jeb->free_size; |
|
c->used_size -= jeb->used_size; |
|
c->dirty_size -= jeb->dirty_size; |
|
jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; |
|
jeb->free_size = c->sector_size; |
|
|
|
jffs2_free_jeb_node_refs(c, jeb); |
|
return -ENOTRECOVERABLE; |
|
} |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/* Process the summary node - called from jffs2_scan_eraseblock() */ |
|
int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
|
struct jffs2_raw_summary *summary, uint32_t sumsize, |
|
uint32_t *pseudo_random) |
|
{ |
|
struct jffs2_unknown_node crcnode; |
|
int ret, ofs; |
|
uint32_t crc; |
|
|
|
ofs = c->sector_size - sumsize; |
|
|
|
dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", |
|
jeb->offset, jeb->offset + ofs, sumsize); |
|
|
|
/* OK, now check for node validity and CRC */ |
|
crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
|
crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); |
|
crcnode.totlen = summary->totlen; |
|
crc = crc32(0, &crcnode, sizeof(crcnode)-4); |
|
|
|
if (je32_to_cpu(summary->hdr_crc) != crc) { |
|
dbg_summary("Summary node header is corrupt (bad CRC or " |
|
"no summary at all)\n"); |
|
goto crc_err; |
|
} |
|
|
|
if (je32_to_cpu(summary->totlen) != sumsize) { |
|
dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); |
|
goto crc_err; |
|
} |
|
|
|
crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); |
|
|
|
if (je32_to_cpu(summary->node_crc) != crc) { |
|
dbg_summary("Summary node is corrupt (bad CRC)\n"); |
|
goto crc_err; |
|
} |
|
|
|
crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); |
|
|
|
if (je32_to_cpu(summary->sum_crc) != crc) { |
|
dbg_summary("Summary node data is corrupt (bad CRC)\n"); |
|
goto crc_err; |
|
} |
|
|
|
if ( je32_to_cpu(summary->cln_mkr) ) { |
|
|
|
dbg_summary("Summary : CLEANMARKER node \n"); |
|
|
|
ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); |
|
if (ret) |
|
return ret; |
|
|
|
if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { |
|
dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", |
|
je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); |
|
if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) |
|
return ret; |
|
} else if (jeb->first_node) { |
|
dbg_summary("CLEANMARKER node not first node in block " |
|
"(0x%08x)\n", jeb->offset); |
|
if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) |
|
return ret; |
|
} else { |
|
jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, |
|
je32_to_cpu(summary->cln_mkr), NULL); |
|
} |
|
} |
|
|
|
ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); |
|
/* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full |
|
scan of this eraseblock. So return zero */ |
|
if (ret == -ENOTRECOVERABLE) |
|
return 0; |
|
if (ret) |
|
return ret; /* real error */ |
|
|
|
/* for PARANOIA_CHECK */ |
|
ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); |
|
if (ret) |
|
return ret; |
|
|
|
sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); |
|
|
|
if (unlikely(jeb->free_size)) { |
|
JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", |
|
jeb->free_size, jeb->offset); |
|
jeb->wasted_size += jeb->free_size; |
|
c->wasted_size += jeb->free_size; |
|
c->free_size -= jeb->free_size; |
|
jeb->free_size = 0; |
|
} |
|
|
|
return jffs2_scan_classify_jeb(c, jeb); |
|
|
|
crc_err: |
|
JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); |
|
|
|
return 0; |
|
} |
|
|
|
/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ |
|
|
|
static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
|
uint32_t infosize, uint32_t datasize, int padsize) |
|
{ |
|
struct jffs2_raw_summary isum; |
|
union jffs2_sum_mem *temp; |
|
struct jffs2_sum_marker *sm; |
|
struct kvec vecs[2]; |
|
uint32_t sum_ofs; |
|
void *wpage; |
|
int ret; |
|
size_t retlen; |
|
|
|
if (padsize + datasize > MAX_SUMMARY_SIZE) { |
|
/* It won't fit in the buffer. Abort summary for this jeb */ |
|
jffs2_sum_disable_collecting(c->summary); |
|
|
|
JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n", |
|
datasize, padsize, jeb->offset); |
|
/* Non-fatal */ |
|
return 0; |
|
} |
|
/* Is there enough space for summary? */ |
|
if (padsize < 0) { |
|
/* don't try to write out summary for this jeb */ |
|
jffs2_sum_disable_collecting(c->summary); |
|
|
|
JFFS2_WARNING("Not enough space for summary, padsize = %d\n", |
|
padsize); |
|
/* Non-fatal */ |
|
return 0; |
|
} |
|
|
|
memset(c->summary->sum_buf, 0xff, datasize); |
|
memset(&isum, 0, sizeof(isum)); |
|
|
|
isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
|
isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); |
|
isum.totlen = cpu_to_je32(infosize); |
|
isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); |
|
isum.padded = cpu_to_je32(c->summary->sum_padded); |
|
isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); |
|
isum.sum_num = cpu_to_je32(c->summary->sum_num); |
|
wpage = c->summary->sum_buf; |
|
|
|
while (c->summary->sum_num) { |
|
temp = c->summary->sum_list_head; |
|
|
|
switch (je16_to_cpu(temp->u.nodetype)) { |
|
case JFFS2_NODETYPE_INODE: { |
|
struct jffs2_sum_inode_flash *sino_ptr = wpage; |
|
|
|
sino_ptr->nodetype = temp->i.nodetype; |
|
sino_ptr->inode = temp->i.inode; |
|
sino_ptr->version = temp->i.version; |
|
sino_ptr->offset = temp->i.offset; |
|
sino_ptr->totlen = temp->i.totlen; |
|
|
|
wpage += JFFS2_SUMMARY_INODE_SIZE; |
|
|
|
break; |
|
} |
|
|
|
case JFFS2_NODETYPE_DIRENT: { |
|
struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; |
|
|
|
sdrnt_ptr->nodetype = temp->d.nodetype; |
|
sdrnt_ptr->totlen = temp->d.totlen; |
|
sdrnt_ptr->offset = temp->d.offset; |
|
sdrnt_ptr->pino = temp->d.pino; |
|
sdrnt_ptr->version = temp->d.version; |
|
sdrnt_ptr->ino = temp->d.ino; |
|
sdrnt_ptr->nsize = temp->d.nsize; |
|
sdrnt_ptr->type = temp->d.type; |
|
|
|
memcpy(sdrnt_ptr->name, temp->d.name, |
|
temp->d.nsize); |
|
|
|
wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); |
|
|
|
break; |
|
} |
|
#ifdef CONFIG_JFFS2_FS_XATTR |
|
case JFFS2_NODETYPE_XATTR: { |
|
struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; |
|
|
|
temp = c->summary->sum_list_head; |
|
sxattr_ptr->nodetype = temp->x.nodetype; |
|
sxattr_ptr->xid = temp->x.xid; |
|
sxattr_ptr->version = temp->x.version; |
|
sxattr_ptr->offset = temp->x.offset; |
|
sxattr_ptr->totlen = temp->x.totlen; |
|
|
|
wpage += JFFS2_SUMMARY_XATTR_SIZE; |
|
break; |
|
} |
|
case JFFS2_NODETYPE_XREF: { |
|
struct jffs2_sum_xref_flash *sxref_ptr = wpage; |
|
|
|
temp = c->summary->sum_list_head; |
|
sxref_ptr->nodetype = temp->r.nodetype; |
|
sxref_ptr->offset = temp->r.offset; |
|
|
|
wpage += JFFS2_SUMMARY_XREF_SIZE; |
|
break; |
|
} |
|
#endif |
|
default : { |
|
if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) |
|
== JFFS2_FEATURE_RWCOMPAT_COPY) { |
|
dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", |
|
je16_to_cpu(temp->u.nodetype)); |
|
jffs2_sum_disable_collecting(c->summary); |
|
/* The above call removes the list, nothing more to do */ |
|
goto bail_rwcompat; |
|
} else { |
|
BUG(); /* unknown node in summary information */ |
|
} |
|
} |
|
} |
|
|
|
c->summary->sum_list_head = temp->u.next; |
|
kfree(temp); |
|
|
|
c->summary->sum_num--; |
|
} |
|
bail_rwcompat: |
|
|
|
jffs2_sum_reset_collected(c->summary); |
|
|
|
wpage += padsize; |
|
|
|
sm = wpage; |
|
sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); |
|
sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); |
|
|
|
isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); |
|
isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); |
|
|
|
vecs[0].iov_base = &isum; |
|
vecs[0].iov_len = sizeof(isum); |
|
vecs[1].iov_base = c->summary->sum_buf; |
|
vecs[1].iov_len = datasize; |
|
|
|
sum_ofs = jeb->offset + c->sector_size - jeb->free_size; |
|
|
|
dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs); |
|
|
|
ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); |
|
|
|
if (ret || (retlen != infosize)) { |
|
|
|
JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", |
|
infosize, sum_ofs, ret, retlen); |
|
|
|
if (retlen) { |
|
/* Waste remaining space */ |
|
spin_lock(&c->erase_completion_lock); |
|
jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); |
|
spin_unlock(&c->erase_completion_lock); |
|
} |
|
|
|
c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; |
|
|
|
return 0; |
|
} |
|
|
|
spin_lock(&c->erase_completion_lock); |
|
jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); |
|
spin_unlock(&c->erase_completion_lock); |
|
|
|
return 0; |
|
} |
|
|
|
/* Write out summary information - called from jffs2_do_reserve_space */ |
|
|
|
int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) |
|
__must_hold(&c->erase_completion_block) |
|
{ |
|
int datasize, infosize, padsize; |
|
struct jffs2_eraseblock *jeb; |
|
int ret = 0; |
|
|
|
dbg_summary("called\n"); |
|
|
|
spin_unlock(&c->erase_completion_lock); |
|
|
|
jeb = c->nextblock; |
|
jffs2_prealloc_raw_node_refs(c, jeb, 1); |
|
|
|
if (!c->summary->sum_num || !c->summary->sum_list_head) { |
|
JFFS2_WARNING("Empty summary info!!!\n"); |
|
BUG(); |
|
} |
|
|
|
datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); |
|
infosize = sizeof(struct jffs2_raw_summary) + datasize; |
|
padsize = jeb->free_size - infosize; |
|
infosize += padsize; |
|
datasize += padsize; |
|
|
|
ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); |
|
spin_lock(&c->erase_completion_lock); |
|
return ret; |
|
}
|
|
|