diff options
Diffstat (limited to 'fs/jffs2/write.c')
| -rw-r--r-- | fs/jffs2/write.c | 708 |
1 files changed, 708 insertions, 0 deletions
diff --git a/fs/jffs2/write.c b/fs/jffs2/write.c new file mode 100644 index 000000000000..80a5db542629 --- /dev/null +++ b/fs/jffs2/write.c @@ -0,0 +1,708 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 2001-2003 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + * $Id: write.c,v 1.87 2004/11/16 20:36:12 dwmw2 Exp $ + * + */ + +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/crc32.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <linux/mtd/mtd.h> +#include "nodelist.h" +#include "compr.h" + + +int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri) +{ + struct jffs2_inode_cache *ic; + + ic = jffs2_alloc_inode_cache(); + if (!ic) { + return -ENOMEM; + } + + memset(ic, 0, sizeof(*ic)); + + f->inocache = ic; + f->inocache->nlink = 1; + f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; + f->inocache->ino = ++c->highest_ino; + f->inocache->state = INO_STATE_PRESENT; + + ri->ino = cpu_to_je32(f->inocache->ino); + + D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino)); + jffs2_add_ino_cache(c, f->inocache); + + ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); + ri->totlen = cpu_to_je32(PAD(sizeof(*ri))); + ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); + ri->mode = cpu_to_jemode(mode); + + f->highest_version = 1; + ri->version = cpu_to_je32(f->highest_version); + + return 0; +} + +#if CONFIG_JFFS2_FS_DEBUG > 0 +static void writecheck(struct jffs2_sb_info *c, uint32_t ofs) +{ + unsigned char buf[16]; + size_t retlen; + int ret, i; + + ret = jffs2_flash_read(c, ofs, 16, &retlen, buf); + if (ret || (retlen != 16)) { + D1(printk(KERN_DEBUG "read failed or short in writecheck(). ret %d, retlen %zd\n", ret, retlen)); + return; + } + ret = 0; + for (i=0; i<16; i++) { + if (buf[i] != 0xff) + ret = 1; + } + if (ret) { + printk(KERN_WARNING "ARGH. About to write node to 0x%08x on flash, but there are data already there:\n", ofs); + printk(KERN_WARNING "0x%08x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", + ofs, + buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], + buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]); + } +} +#endif + + +/* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, + write it to the flash, link it into the existing inode/fragment list */ + +struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const unsigned char *data, uint32_t datalen, uint32_t flash_ofs, int alloc_mode) + +{ + struct jffs2_raw_node_ref *raw; + struct jffs2_full_dnode *fn; + size_t retlen; + struct kvec vecs[2]; + int ret; + int retried = 0; + unsigned long cnt = 2; + + D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { + printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n"); + BUG(); + } + ); + vecs[0].iov_base = ri; + vecs[0].iov_len = sizeof(*ri); + vecs[1].iov_base = (unsigned char *)data; + vecs[1].iov_len = datalen; + + D1(writecheck(c, flash_ofs)); + + if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { + printk(KERN_WARNING "jffs2_write_dnode: ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", je32_to_cpu(ri->totlen), sizeof(*ri), datalen); + } + raw = jffs2_alloc_raw_node_ref(); + if (!raw) + return ERR_PTR(-ENOMEM); + + fn = jffs2_alloc_full_dnode(); + if (!fn) { + jffs2_free_raw_node_ref(raw); + return ERR_PTR(-ENOMEM); + } + + fn->ofs = je32_to_cpu(ri->offset); + fn->size = je32_to_cpu(ri->dsize); + fn->frags = 0; + + /* check number of valid vecs */ + if (!datalen || !data) + cnt = 1; + retry: + fn->raw = raw; + + raw->flash_offset = flash_ofs; + raw->__totlen = PAD(sizeof(*ri)+datalen); + raw->next_phys = NULL; + + ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, + (alloc_mode==ALLOC_GC)?0:f->inocache->ino); + + if (ret || (retlen != sizeof(*ri) + datalen)) { + printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", + sizeof(*ri)+datalen, flash_ofs, ret, retlen); + + /* Mark the space as dirtied */ + if (retlen) { + /* Doesn't belong to any inode */ + raw->next_in_ino = NULL; + + /* Don't change raw->size to match retlen. We may have + written the node header already, and only the data will + seem corrupted, in which case the scan would skip over + any node we write before the original intended end of + this node */ + raw->flash_offset |= REF_OBSOLETE; + jffs2_add_physical_node_ref(c, raw); + jffs2_mark_node_obsolete(c, raw); + } else { + printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); + jffs2_free_raw_node_ref(raw); + } + if (!retried && alloc_mode != ALLOC_NORETRY && (raw = jffs2_alloc_raw_node_ref())) { + /* Try to reallocate space and retry */ + uint32_t dummy; + struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; + + retried = 1; + + D1(printk(KERN_DEBUG "Retrying failed write.\n")); + + ACCT_SANITY_CHECK(c,jeb); + D1(ACCT_PARANOIA_CHECK(jeb)); + + if (alloc_mode == ALLOC_GC) { + ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &flash_ofs, &dummy); + } else { + /* Locking pain */ + up(&f->sem); + jffs2_complete_reservation(c); + + ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &flash_ofs, &dummy, alloc_mode); + down(&f->sem); + } + + if (!ret) { + D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); + + ACCT_SANITY_CHECK(c,jeb); + D1(ACCT_PARANOIA_CHECK(jeb)); + + goto retry; + } + D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); + jffs2_free_raw_node_ref(raw); + } + /* Release the full_dnode which is now useless, and return */ + jffs2_free_full_dnode(fn); + return ERR_PTR(ret?ret:-EIO); + } + /* Mark the space used */ + /* If node covers at least a whole page, or if it starts at the + beginning of a page and runs to the end of the file, or if + it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. + */ + if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) || + ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) && + (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { + raw->flash_offset |= REF_PRISTINE; + } else { + raw->flash_offset |= REF_NORMAL; + } + jffs2_add_physical_node_ref(c, raw); + + /* Link into per-inode list */ + spin_lock(&c->erase_completion_lock); + raw->next_in_ino = f->inocache->nodes; + f->inocache->nodes = raw; + spin_unlock(&c->erase_completion_lock); + + D1(printk(KERN_DEBUG "jffs2_write_dnode wrote node at 0x%08x(%d) with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n", + flash_ofs, ref_flags(raw), je32_to_cpu(ri->dsize), + je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), + je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); + + if (retried) { + ACCT_SANITY_CHECK(c,NULL); + } + + return fn; +} + +struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_dirent *rd, const unsigned char *name, uint32_t namelen, uint32_t flash_ofs, int alloc_mode) +{ + struct jffs2_raw_node_ref *raw; + struct jffs2_full_dirent *fd; + size_t retlen; + struct kvec vecs[2]; + int retried = 0; + int ret; + + D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", + je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), + je32_to_cpu(rd->name_crc))); + D1(writecheck(c, flash_ofs)); + + D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { + printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); + BUG(); + } + ); + + vecs[0].iov_base = rd; + vecs[0].iov_len = sizeof(*rd); + vecs[1].iov_base = (unsigned char *)name; + vecs[1].iov_len = namelen; + + raw = jffs2_alloc_raw_node_ref(); + + if (!raw) + return ERR_PTR(-ENOMEM); + + fd = jffs2_alloc_full_dirent(namelen+1); + if (!fd) { + jffs2_free_raw_node_ref(raw); + return ERR_PTR(-ENOMEM); + } + + fd->version = je32_to_cpu(rd->version); + fd->ino = je32_to_cpu(rd->ino); + fd->nhash = full_name_hash(name, strlen(name)); + fd->type = rd->type; + memcpy(fd->name, name, namelen); + fd->name[namelen]=0; + + retry: + fd->raw = raw; + + raw->flash_offset = flash_ofs; + raw->__totlen = PAD(sizeof(*rd)+namelen); + raw->next_phys = NULL; + + ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, + (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); + if (ret || (retlen != sizeof(*rd) + namelen)) { + printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", + sizeof(*rd)+namelen, flash_ofs, ret, retlen); + /* Mark the space as dirtied */ + if (retlen) { + raw->next_in_ino = NULL; + raw->flash_offset |= REF_OBSOLETE; + jffs2_add_physical_node_ref(c, raw); + jffs2_mark_node_obsolete(c, raw); + } else { + printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); + jffs2_free_raw_node_ref(raw); + } + if (!retried && (raw = jffs2_alloc_raw_node_ref())) { + /* Try to reallocate space and retry */ + uint32_t dummy; + struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; + + retried = 1; + + D1(printk(KERN_DEBUG "Retrying failed write.\n")); + + ACCT_SANITY_CHECK(c,jeb); + D1(ACCT_PARANOIA_CHECK(jeb)); + + if (alloc_mode == ALLOC_GC) { + ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &flash_ofs, &dummy); + } else { + /* Locking pain */ + up(&f->sem); + jffs2_complete_reservation(c); + + ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &flash_ofs, &dummy, alloc_mode); + down(&f->sem); + } + + if (!ret) { + D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); + ACCT_SANITY_CHECK(c,jeb); + D1(ACCT_PARANOIA_CHECK(jeb)); + goto retry; + } + D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); + jffs2_free_raw_node_ref(raw); + } + /* Release the full_dnode which is now useless, and return */ + jffs2_free_full_dirent(fd); + return ERR_PTR(ret?ret:-EIO); + } + /* Mark the space used */ + raw->flash_offset |= REF_PRISTINE; + jffs2_add_physical_node_ref(c, raw); + + spin_lock(&c->erase_completion_lock); + raw->next_in_ino = f->inocache->nodes; + f->inocache->nodes = raw; + spin_unlock(&c->erase_completion_lock); + + if (retried) { + ACCT_SANITY_CHECK(c,NULL); + } + + return fd; +} + +/* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that + we don't have to go digging in struct inode or its equivalent. It should set: + mode, uid, gid, (starting)isize, atime, ctime, mtime */ +int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + struct jffs2_raw_inode *ri, unsigned char *buf, + uint32_t offset, uint32_t writelen, uint32_t *retlen) +{ + int ret = 0; + uint32_t writtenlen = 0; + + D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", + f->inocache->ino, offset, writelen)); + + while(writelen) { + struct jffs2_full_dnode *fn; + unsigned char *comprbuf = NULL; + uint16_t comprtype = JFFS2_COMPR_NONE; + uint32_t phys_ofs, alloclen; + uint32_t datalen, cdatalen; + int retried = 0; + + retry: + D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); + + ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); + break; + } + down(&f->sem); + datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); + cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); + + comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); + + ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); + ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); + ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); + + ri->ino = cpu_to_je32(f->inocache->ino); + ri->version = cpu_to_je32(++f->highest_version); + ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); + ri->offset = cpu_to_je32(offset); + ri->csize = cpu_to_je32(cdatalen); + ri->dsize = cpu_to_je32(datalen); + ri->compr = comprtype & 0xff; + ri->usercompr = (comprtype >> 8 ) & 0xff; + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); + + fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, phys_ofs, ALLOC_NORETRY); + + jffs2_free_comprbuf(comprbuf, buf); + + if (IS_ERR(fn)) { + ret = PTR_ERR(fn); + up(&f->sem); + jffs2_complete_reservation(c); + if (!retried) { + /* Write error to be retried */ + retried = 1; + D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); + goto retry; + } + break; + } + ret = jffs2_add_full_dnode_to_inode(c, f, fn); + if (f->metadata) { + jffs2_mark_node_obsolete(c, f->metadata->raw); + jffs2_free_full_dnode(f->metadata); + f->metadata = NULL; + } + if (ret) { + /* Eep */ + D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); + jffs2_mark_node_obsolete(c, fn->raw); + jffs2_free_full_dnode(fn); + + up(&f->sem); + jffs2_complete_reservation(c); + break; + } + up(&f->sem); + jffs2_complete_reservation(c); + if (!datalen) { + printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); + ret = -EIO; + break; + } + D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen)); + writtenlen += datalen; + offset += datalen; + writelen -= datalen; + buf += datalen; + } + *retlen = writtenlen; + return ret; +} + +int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + uint32_t alloclen, phys_ofs; + int ret; + + /* Try to reserve enough space for both node and dirent. + * Just the node will do for now, though + */ + ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); + D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); + if (ret) { + up(&f->sem); + return ret; + } + + ri->data_crc = cpu_to_je32(0); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + + fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); + + D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", + jemode_to_cpu(ri->mode))); + + if (IS_ERR(fn)) { + D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); + /* Eeek. Wave bye bye */ + up(&f->sem); + jffs2_complete_reservation(c); + return PTR_ERR(fn); + } + /* No data here. Only a metadata node, which will be + obsoleted by the first data write + */ + f->metadata = fn; + + up(&f->sem); + jffs2_complete_reservation(c); + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + + if (ret) { + /* Eep. */ + D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); + return ret; + } + + rd = jffs2_alloc_raw_dirent(); + if (!rd) { + /* Argh. Now we treat it like a normal delete */ + jffs2_complete_reservation(c); + return -ENOMEM; + } + + down(&dir_f->sem); + + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_f->inocache->ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = ri->ino; + rd->mctime = ri->ctime; + rd->nsize = namelen; + rd->type = DT_REG; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + /* dirent failed to write. Delete the inode normally + as if it were the final unlink() */ + jffs2_complete_reservation(c); + up(&dir_f->sem); + return PTR_ERR(fd); + } + + /* Link the fd into the inode's list, obsoleting an old + one if necessary. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + + jffs2_complete_reservation(c); + up(&dir_f->sem); + + return 0; +} + + +int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, + const char *name, int namelen, struct jffs2_inode_info *dead_f) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dirent *fd; + uint32_t alloclen, phys_ofs; + int ret; + + if (1 /* alternative branch needs testing */ || + !jffs2_can_mark_obsolete(c)) { + /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ + + rd = jffs2_alloc_raw_dirent(); + if (!rd) + return -ENOMEM; + + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_DELETION); + if (ret) { + jffs2_free_raw_dirent(rd); + return ret; + } + + down(&dir_f->sem); + + /* Build a deletion node */ + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_f->inocache->ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(0); + rd->mctime = cpu_to_je32(get_seconds()); + rd->nsize = namelen; + rd->type = DT_UNKNOWN; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_DELETION); + + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + jffs2_complete_reservation(c); + up(&dir_f->sem); + return PTR_ERR(fd); + } + + /* File it. This will mark the old one obsolete. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + up(&dir_f->sem); + } else { + struct jffs2_full_dirent **prev = &dir_f->dents; + uint32_t nhash = full_name_hash(name, namelen); + + down(&dir_f->sem); + + while ((*prev) && (*prev)->nhash <= nhash) { + if ((*prev)->nhash == nhash && + !memcmp((*prev)->name, name, namelen) && + !(*prev)->name[namelen]) { + struct jffs2_full_dirent *this = *prev; + + D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", + this->ino, ref_offset(this->raw))); + + *prev = this->next; + jffs2_mark_node_obsolete(c, (this->raw)); + jffs2_free_full_dirent(this); + break; + } + prev = &((*prev)->next); + } + up(&dir_f->sem); + } + + /* dead_f is NULL if this was a rename not a real unlink */ + /* Also catch the !f->inocache case, where there was a dirent + pointing to an inode which didn't exist. */ + if (dead_f && dead_f->inocache) { + + down(&dead_f->sem); + + while (dead_f->dents) { + /* There can be only deleted ones */ + fd = dead_f->dents; + + dead_f->dents = fd->next; + + if (fd->ino) { + printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", + dead_f->inocache->ino, fd->name, fd->ino); + } else { + D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", fd->name, dead_f->inocache->ino)); + } + jffs2_mark_node_obsolete(c, fd->raw); + jffs2_free_full_dirent(fd); + } + + dead_f->inocache->nlink--; + /* NB: Caller must set inode nlink if appropriate */ + up(&dead_f->sem); + } + + jffs2_complete_reservation(c); + + return 0; +} + + +int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dirent *fd; + uint32_t alloclen, phys_ofs; + int ret; + + rd = jffs2_alloc_raw_dirent(); + if (!rd) + return -ENOMEM; + + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + jffs2_free_raw_dirent(rd); + return ret; + } + + down(&dir_f->sem); + + /* Build a deletion node */ + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_f->inocache->ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(ino); + rd->mctime = cpu_to_je32(get_seconds()); + rd->nsize = namelen; + + rd->type = type; + + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + jffs2_complete_reservation(c); + up(&dir_f->sem); + return PTR_ERR(fd); + } + + /* File it. This will mark the old one obsolete. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + + jffs2_complete_reservation(c); + up(&dir_f->sem); + + return 0; +} |