cregit-Linux how code gets into the kernel

Release 4.11 fs/jffs2/summary.c

Directory: fs/jffs2
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
 *                   Zoltan Sogor <weth@inf.u-szeged.hu>,
 *                   Patrik Kluba <pajko@halom.u-szeged.hu>,
 *                   University of Szeged, Hungary
 *             2006  KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/pagemap.h>
#include <linux/crc32.h>
#include <linux/compiler.h>
#include <linux/vmalloc.h>
#include "nodelist.h"
#include "debug.h"


int jffs2_sum_init(struct jffs2_sb_info *c) { uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE); c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); if (!c->summary) { JFFS2_WARNING("Can't allocate memory for summary information!\n"); return -ENOMEM; } c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL); if (!c->summary->sum_buf) { JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); kfree(c->summary); return -ENOMEM; } dbg_summary("returned successfully\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi7773.33%116.67%
David Woodhouse1716.19%116.67%
Artem B. Bityutskiy87.62%116.67%
Yan Burman10.95%116.67%
Andreas Mohr10.95%116.67%
Roel Kluin10.95%116.67%
Total105100.00%6100.00%


void jffs2_sum_exit(struct jffs2_sb_info *c) { dbg_summary("called\n"); jffs2_sum_disable_collecting(c->summary); kfree(c->summary->sum_buf); c->summary->sum_buf = NULL; kfree(c->summary); c->summary = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi5096.15%133.33%
David Woodhouse11.92%133.33%
Artem B. Bityutskiy11.92%133.33%
Total52100.00%3100.00%


static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) { if (!s->sum_list_head) s->sum_list_head = (union jffs2_sum_mem *) item; if (s->sum_list_tail) s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; s->sum_list_tail = (union jffs2_sum_mem *) item; switch (je16_to_cpu(item->u.nodetype)) { case JFFS2_NODETYPE_INODE: s->sum_size += JFFS2_SUMMARY_INODE_SIZE; s->sum_num++; dbg_summary("inode (%u) added to summary\n", je32_to_cpu(item->i.inode)); break; case JFFS2_NODETYPE_DIRENT: s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); s->sum_num++; dbg_summary("dirent (%u) added to summary\n", je32_to_cpu(item->d.ino)); break; #ifdef CONFIG_JFFS2_FS_XATTR case JFFS2_NODETYPE_XATTR: s->sum_size += JFFS2_SUMMARY_XATTR_SIZE; s->sum_num++; dbg_summary("xattr (xid=%u, version=%u) added to summary\n", je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version)); break; case JFFS2_NODETYPE_XREF: s->sum_size += JFFS2_SUMMARY_XREF_SIZE; s->sum_num++; dbg_summary("xref added to summary\n"); break; #endif default: JFFS2_WARNING("UNKNOWN node type %u\n", je16_to_cpu(item->u.nodetype)); return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi16371.49%133.33%
KaiGai Kohei6327.63%133.33%
Artem B. Bityutskiy20.88%133.33%
Total228100.00%3100.00%

/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) { dbg_summary("called with %u\n", size); s->sum_padded += size; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi2896.55%150.00%
Artem B. Bityutskiy13.45%150.00%
Total29100.00%2100.00%


int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs) { struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = ri->nodetype; temp->inode = ri->ino; temp->version = ri->version; temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */ temp->totlen = ri->totlen; temp->next = NULL; return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi10399.04%150.00%
Lucas De Marchi10.96%150.00%
Total104100.00%2100.00%


int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs) { struct jffs2_sum_dirent_mem *temp = kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = rd->nodetype; temp->totlen = rd->totlen; temp->offset = cpu_to_je32(ofs); /* relative from the beginning of the jeb */ temp->pino = rd->pino; temp->version = rd->version; temp->ino = rd->ino; temp->nsize = rd->nsize; temp->type = rd->type; temp->next = NULL; memcpy(temp->name, rd->name, rd->nsize); return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi14699.32%150.00%
Lucas De Marchi10.68%150.00%
Total147100.00%2100.00%

#ifdef CONFIG_JFFS2_FS_XATTR
int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs) { struct jffs2_sum_xattr_mem *temp; temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = rx->nodetype; temp->xid = rx->xid; temp->version = rx->version; temp->offset = cpu_to_je32(ofs); temp->totlen = rx->totlen; temp->next = NULL; return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); }

Contributors

PersonTokensPropCommitsCommitProp
KaiGai Kohei105100.00%1100.00%
Total105100.00%1100.00%


int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs) { struct jffs2_sum_xref_mem *temp; temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = rr->nodetype; temp->offset = cpu_to_je32(ofs); temp->next = NULL; return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); }

Contributors

PersonTokensPropCommitsCommitProp
KaiGai Kohei81100.00%1100.00%
Total81100.00%1100.00%

#endif /* Cleanup every collected summary information */
static void jffs2_sum_clean_collected(struct jffs2_summary *s) { union jffs2_sum_mem *temp; if (!s->sum_list_head) { dbg_summary("already empty\n"); } while (s->sum_list_head) { temp = s->sum_list_head; s->sum_list_head = s->sum_list_head->u.next; kfree(temp); } s->sum_list_tail = NULL; s->sum_padded = 0; s->sum_num = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi7898.73%150.00%
Artem B. Bityutskiy11.27%150.00%
Total79100.00%2100.00%


void jffs2_sum_reset_collected(struct jffs2_summary *s) { dbg_summary("called\n"); jffs2_sum_clean_collected(s); s->sum_size = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi2596.15%150.00%
Artem B. Bityutskiy13.85%150.00%
Total26100.00%2100.00%


void jffs2_sum_disable_collecting(struct jffs2_summary *s) { dbg_summary("called\n"); jffs2_sum_clean_collected(s); s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi2596.15%150.00%
Artem B. Bityutskiy13.85%150.00%
Total26100.00%2100.00%


int jffs2_sum_is_disabled(struct jffs2_summary *s) { return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi19100.00%1100.00%
Total19100.00%1100.00%

/* Move the collected summary information into sb (called from scan.c) */
void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) { dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", c->summary->sum_size, c->summary->sum_num, s->sum_size, s->sum_num); c->summary->sum_size = s->sum_size; c->summary->sum_num = s->sum_num; c->summary->sum_padded = s->sum_padded; c->summary->sum_list_head = s->sum_list_head; c->summary->sum_list_tail = s->sum_list_tail; s->sum_list_head = s->sum_list_tail = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi9999.00%150.00%
Artem B. Bityutskiy11.00%150.00%
Total100100.00%2100.00%

/* Called from wbuf.c to collect writed node info */
int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, uint32_t ofs) { union jffs2_node_union *node; struct jffs2_eraseblock *jeb; if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) { dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n"); return 0; } node = invecs[0].iov_base; jeb = &c->blocks[ofs / c->sector_size]; ofs -= jeb->offset; switch (je16_to_cpu(node->u.nodetype)) { case JFFS2_NODETYPE_INODE: { struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->i.nodetype; temp->inode = node->i.ino; temp->version = node->i.version; temp->offset = cpu_to_je32(ofs); temp->totlen = node->i.totlen; temp->next = NULL; return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } case JFFS2_NODETYPE_DIRENT: { struct jffs2_sum_dirent_mem *temp = kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->d.nodetype; temp->totlen = node->d.totlen; temp->offset = cpu_to_je32(ofs); temp->pino = node->d.pino; temp->version = node->d.version; temp->ino = node->d.ino; temp->nsize = node->d.nsize; temp->type = node->d.type; temp->next = NULL; switch (count) { case 1: memcpy(temp->name,node->d.name,node->d.nsize); break; case 2: memcpy(temp->name,invecs[1].iov_base,node->d.nsize); break; default: BUG(); /* impossible count value */ break; } return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } #ifdef CONFIG_JFFS2_FS_XATTR case JFFS2_NODETYPE_XATTR: { struct jffs2_sum_xattr_mem *temp; temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->x.nodetype; temp->xid = node->x.xid; temp->version = node->x.version; temp->totlen = node->x.totlen; temp->offset = cpu_to_je32(ofs); temp->next = NULL; return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } case JFFS2_NODETYPE_XREF: { struct jffs2_sum_xref_mem *temp; temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->r.nodetype; temp->offset = cpu_to_je32(ofs); temp->next = NULL; return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } #endif case JFFS2_NODETYPE_PADDING: dbg_summary("node PADDING\n"); c->summary->sum_padded += je32_to_cpu(node->u.totlen); break; case JFFS2_NODETYPE_CLEANMARKER: dbg_summary("node CLEANMARKER\n"); break; case JFFS2_NODETYPE_SUMMARY: dbg_summary("node SUMMARY\n"); break; default: /* If you implement a new node type you should also implement summary support for it or disable summary. */ BUG(); break; } return 0; no_mem: JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Ferenc Havasi39763.32%125.00%
KaiGai Kohei20933.33%125.00%
Zoltan Sogor203.19%125.00%
Artem B. Bityutskiy10.16%125.00%
Total627100.00%4100.00%


static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t ofs, uint32_t len, struct jffs2_inode_cache *ic) { /* If there was a gap, mark it dirty */ if ((ofs & ~3) > c->sector_size - jeb->free_size) { /* Ew. Summary doesn't actually tell us explicitly about dirty space */ jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); } return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse92100.00%2100.00%
Total92100.00%2100.00%

/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_summary *summary, uint32_t *pseudo_random) { struct jffs2_inode_cache *ic; struct jffs2_full_dirent *fd; void *sp; int i, ino; int err; sp = summary->sum; for (i=0; i<je32_to_cpu(summary->sum_num); i++) { dbg_summary("processing summary index %d\n", i); cond_resched(); /* Make sure there's a spare ref for dirty space */ err = jffs2_prealloc_raw_node_refs(c, jeb, 2); if (err) return err; switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { case JFFS2_NODETYPE_INODE: { struct jffs2_sum_inode_flash *spi; spi = sp; ino = je32_to_cpu(spi->inode); dbg_summary("Inode at 0x%08x-0x%08x\n", jeb->offset + je32_to_cpu(spi->offset), jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); ic = jffs2_scan_make_ino_cache(c, ino); if (!ic) { JFFS2_NOTICE("scan_make_ino_cache failed\n"); return -ENOMEM; } sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, PAD(je32_to_cpu(spi->totlen)), ic); *pseudo_random += je32_to_cpu(spi->version); sp += JFFS2_SUMMARY_INODE_SIZE; break; } case JFFS2_NODETYPE_DIRENT: { struct jffs2_sum_dirent_flash *spd; int checkedlen; spd = sp; dbg_summary("Dirent at 0x%08x-0x%08x\n", jeb->offset + je32_to_cpu(spd->offset), jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); /* This should never happen, but https://dev.laptop.org/ticket/4184 */ checkedlen = strnlen(spd->name, spd->nsize); if (!checkedlen) { pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n", jeb->offset + je32_to_cpu(spd->offset)); return -EIO; } if (checkedlen < spd->nsize) { pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", jeb->offset + je32_to_cpu(spd->offset), checkedlen); } fd = jffs2_alloc_full_dirent(checkedlen+1); if (!fd) return -ENOMEM; memcpy(&fd->name, spd->name, checkedlen); fd->name[checkedlen] = 0; ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); if (!ic) { jffs2_free_full_dirent(fd); return -ENOMEM; } fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, PAD(je32_to_cpu(spd->totlen)), ic); fd->next = NULL; fd->version = je32_to_cpu(spd->version); fd->ino = je32_to_cpu(spd->ino); fd->nhash = full_name_hash(NULL, fd->name, checkedlen); fd->type = spd->type; jffs2_add_fd_to_list(c, fd, &ic->scan_dents); *pseudo_random += je32_to_cpu(spd->version); sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); break; } #ifdef CONFIG_JFFS2_FS_XATTR case JFFS2_NODETYPE_XATTR: { struct jffs2_xattr_datum *xd; struct jffs2_sum_xattr_flash *spx; spx = (struct jffs2_sum_xattr_flash *)sp; dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", jeb->offset + je32_to_cpu(spx->offset), jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); if (IS_ERR(xd)) return PTR_ERR(xd); if (xd->version > je32_to_cpu(spx->version)) { /* node is not the newest one */ struct jffs2_raw_node_ref *raw = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, PAD(je32_to_cpu(spx->totlen)), NULL); raw->next_in_ino = xd->node->next_in_ino; xd->node->next_in_ino = raw; } else { xd->version = je32_to_cpu(spx->version); sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, PAD(je32_to_cpu(spx->totlen)), (void *)xd); } *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; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse37635.91%1356.52%
KaiGai Kohei36634.96%417.39%
Ferenc Havasi29528.18%28.70%
Artem B. Bityutskiy60.57%28.70%
Joe Perches20.19%14.35%
Linus Torvalds20.19%14.35%
Total1047100.00%23100.00%

/* Process the summary node - called from jffs2_scan_eraseblock() */
int jffs2_sum_scan_sumnode(struct