diff options
Diffstat (limited to 'cpukit/libfs/src/jffs2/src/write.c')
| -rw-r--r-- | cpukit/libfs/src/jffs2/src/write.c | 722 |
1 files changed, 722 insertions, 0 deletions
diff --git a/cpukit/libfs/src/jffs2/src/write.c b/cpukit/libfs/src/jffs2/src/write.c new file mode 100644 index 0000000000..b634de4c81 --- /dev/null +++ b/cpukit/libfs/src/jffs2/src/write.c @@ -0,0 +1,722 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2001-2007 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/crc32.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->pino_nlink = 1; /* Will be overwritten shortly for directories */ + f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; + f->inocache->state = INO_STATE_PRESENT; + + jffs2_add_ino_cache(c, f->inocache); + jffs2_dbg(1, "%s(): Assigned ino# %d\n", __func__, f->inocache->ino); + ri->ino = cpu_to_je32(f->inocache->ino); + + 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; +} + +/* 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, int alloc_mode) + +{ + struct jffs2_full_dnode *fn; + size_t retlen; + uint32_t flash_ofs; + 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)) { + pr_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; + + if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { + pr_warn("%s(): ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", + __func__, je32_to_cpu(ri->totlen), + sizeof(*ri), datalen); + } + + fn = jffs2_alloc_full_dnode(); + if (!fn) + return ERR_PTR(-ENOMEM); + + /* check number of valid vecs */ + if (!datalen || !data) + cnt = 1; + retry: + flash_ofs = write_ofs(c); + + jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); + + if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) { + BUG_ON(!retried); + jffs2_dbg(1, "%s(): dnode_version %d, highest version %d -> updating dnode\n", + __func__, + je32_to_cpu(ri->version), f->highest_version); + ri->version = cpu_to_je32(++f->highest_version); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + } + + ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, + (alloc_mode==ALLOC_GC)?0:f->inocache->ino); + + if (ret || (retlen != sizeof(*ri) + datalen)) { + pr_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) { + /* 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 */ + jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL); + } else { + pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", + flash_ofs); + } + if (!retried && alloc_mode != ALLOC_NORETRY) { + /* Try to reallocate space and retry */ + uint32_t dummy; + struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; + + retried = 1; + + jffs2_dbg(1, "Retrying failed write.\n"); + + jffs2_dbg_acct_sanity_check(c,jeb); + jffs2_dbg_acct_paranoia_check(c, jeb); + + if (alloc_mode == ALLOC_GC) { + ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy, + JFFS2_SUMMARY_INODE_SIZE); + } else { + /* Locking pain */ + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + + ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy, + alloc_mode, JFFS2_SUMMARY_INODE_SIZE); + mutex_lock(&f->sem); + } + + if (!ret) { + flash_ofs = write_ofs(c); + jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write.\n", + flash_ofs); + + jffs2_dbg_acct_sanity_check(c,jeb); + jffs2_dbg_acct_paranoia_check(c, jeb); + + goto retry; + } + jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", + ret); + } + /* 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)))) { + flash_ofs |= REF_PRISTINE; + } else { + flash_ofs |= REF_NORMAL; + } + fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache); + if (IS_ERR(fn->raw)) { + void *hold_err = fn->raw; + /* Release the full_dnode which is now useless, and return */ + jffs2_free_full_dnode(fn); + return ERR_CAST(hold_err); + } + fn->ofs = je32_to_cpu(ri->offset); + fn->size = je32_to_cpu(ri->dsize); + fn->frags = 0; + + jffs2_dbg(1, "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 & ~3, flash_ofs & 3, 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) { + jffs2_dbg_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, int alloc_mode) +{ + struct jffs2_full_dirent *fd; + size_t retlen; + struct kvec vecs[2]; + uint32_t flash_ofs; + int retried = 0; + int ret; + + jffs2_dbg(1, "%s(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", + __func__, + je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), + je32_to_cpu(rd->name_crc)); + + D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { + pr_crit("Eep. CRC not correct in jffs2_write_dirent()\n"); + BUG(); + }); + + if (strnlen(name, namelen) != namelen) { + /* This should never happen, but seems to have done on at least one + occasion: https://dev.laptop.org/ticket/4184 */ + pr_crit("Error in jffs2_write_dirent() -- name contains zero bytes!\n"); + pr_crit("Directory inode #%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)); + WARN_ON(1); + return ERR_PTR(-EIO); + } + + vecs[0].iov_base = rd; + vecs[0].iov_len = sizeof(*rd); + vecs[1].iov_base = (unsigned char *)name; + vecs[1].iov_len = namelen; + + fd = jffs2_alloc_full_dirent(namelen+1); + if (!fd) + return ERR_PTR(-ENOMEM); + + fd->version = je32_to_cpu(rd->version); + fd->ino = je32_to_cpu(rd->ino); + fd->nhash = full_name_hash(name, namelen); + fd->type = rd->type; + memcpy(fd->name, name, namelen); + fd->name[namelen]=0; + + retry: + flash_ofs = write_ofs(c); + + jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); + + if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { + BUG_ON(!retried); + jffs2_dbg(1, "%s(): dirent_version %d, highest version %d -> updating dirent\n", + __func__, + je32_to_cpu(rd->version), f->highest_version); + rd->version = cpu_to_je32(++f->highest_version); + fd->version = je32_to_cpu(rd->version); + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + } + + 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)) { + pr_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) { + jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL); + } else { + pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", + flash_ofs); + } + if (!retried) { + /* Try to reallocate space and retry */ + uint32_t dummy; + struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; + + retried = 1; + + jffs2_dbg(1, "Retrying failed write.\n"); + + jffs2_dbg_acct_sanity_check(c,jeb); + jffs2_dbg_acct_paranoia_check(c, jeb); + + if (alloc_mode == ALLOC_GC) { + ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy, + JFFS2_SUMMARY_DIRENT_SIZE(namelen)); + } else { + /* Locking pain */ + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + + ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy, + alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); + mutex_lock(&f->sem); + } + + if (!ret) { + flash_ofs = write_ofs(c); + jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write\n", + flash_ofs); + jffs2_dbg_acct_sanity_check(c,jeb); + jffs2_dbg_acct_paranoia_check(c, jeb); + goto retry; + } + jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", + ret); + } + /* 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 */ + fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | dirent_node_state(rd), + PAD(sizeof(*rd)+namelen), f->inocache); + if (IS_ERR(fd->raw)) { + void *hold_err = fd->raw; + /* Release the full_dirent which is now useless, and return */ + jffs2_free_full_dirent(fd); + return ERR_CAST(hold_err); + } + + if (retried) { + jffs2_dbg_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; + + jffs2_dbg(1, "%s(): Ino #%u, ofs 0x%x, len 0x%x\n", + __func__, f->inocache->ino, offset, writelen); + + while(writelen) { + struct jffs2_full_dnode *fn; + unsigned char *comprbuf = NULL; + uint16_t comprtype = JFFS2_COMPR_NONE; + uint32_t alloclen; + uint32_t datalen, cdatalen; + int retried = 0; + + retry: + jffs2_dbg(2, "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, + &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); + if (ret) { + jffs2_dbg(1, "jffs2_reserve_space returned %d\n", ret); + break; + } + mutex_lock(&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, ALLOC_NORETRY); + + jffs2_free_comprbuf(comprbuf, buf); + + if (IS_ERR(fn)) { + ret = PTR_ERR(fn); + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + if (!retried) { + /* Write error to be retried */ + retried = 1; + jffs2_dbg(1, "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 */ + jffs2_dbg(1, "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); + + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + break; + } + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + if (!datalen) { + pr_warn("Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); + ret = -EIO; + break; + } + jffs2_dbg(1, "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 struct qstr *qstr) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + uint32_t alloclen; + 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), &alloclen, ALLOC_NORMAL, + JFFS2_SUMMARY_INODE_SIZE); + jffs2_dbg(1, "%s(): reserved 0x%x bytes\n", __func__, alloclen); + if (ret) + return ret; + + mutex_lock(&f->sem); + + 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, ALLOC_NORMAL); + + jffs2_dbg(1, "jffs2_do_create created file with mode 0x%x\n", + jemode_to_cpu(ri->mode)); + + if (IS_ERR(fn)) { + jffs2_dbg(1, "jffs2_write_dnode() failed\n"); + /* Eeek. Wave bye bye */ + mutex_unlock(&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; + + mutex_unlock(&f->sem); + jffs2_complete_reservation(c); + + ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode, qstr); + if (ret) + return ret; + ret = jffs2_init_acl_post(&f->vfs_inode); + if (ret) + return ret; + + ret = jffs2_reserve_space(c, sizeof(*rd)+qstr->len, &alloclen, + ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(qstr->len)); + + if (ret) { + /* Eep. */ + jffs2_dbg(1, "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; + } + + mutex_lock(&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) + qstr->len); + 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 = qstr->len; + rd->type = DT_REG; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, qstr->name, qstr->len)); + + fd = jffs2_write_dirent(c, dir_f, rd, qstr->name, qstr->len, 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); + mutex_unlock(&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); + mutex_unlock(&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, + uint32_t time) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dirent *fd; + uint32_t alloclen; + int ret; + + if (!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, &alloclen, + ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); + if (ret) { + jffs2_free_raw_dirent(rd); + return ret; + } + + mutex_lock(&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(time); + 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, ALLOC_DELETION); + + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + jffs2_complete_reservation(c); + mutex_unlock(&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); + mutex_unlock(&dir_f->sem); + } else { + uint32_t nhash = full_name_hash(name, namelen); + + fd = dir_f->dents; + /* We don't actually want to reserve any space, but we do + want to be holding the alloc_sem when we write to flash */ + mutex_lock(&c->alloc_sem); + mutex_lock(&dir_f->sem); + + for (fd = dir_f->dents; fd; fd = fd->next) { + if (fd->nhash == nhash && + !memcmp(fd->name, name, namelen) && + !fd->name[namelen]) { + + jffs2_dbg(1, "Marking old dirent node (ino #%u) @%08x obsolete\n", + fd->ino, ref_offset(fd->raw)); + jffs2_mark_node_obsolete(c, fd->raw); + /* We don't want to remove it from the list immediately, + because that screws up getdents()/seek() semantics even + more than they're screwed already. Turn it into a + node-less deletion dirent instead -- a placeholder */ + fd->raw = NULL; + fd->ino = 0; + break; + } + } + mutex_unlock(&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) { + + mutex_lock(&dead_f->sem); + + if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { + while (dead_f->dents) { + /* There can be only deleted ones */ + fd = dead_f->dents; + + dead_f->dents = fd->next; + + if (fd->ino) { + pr_warn("Deleting inode #%u with active dentry \"%s\"->ino #%u\n", + dead_f->inocache->ino, + fd->name, fd->ino); + } else { + jffs2_dbg(1, "Removing deletion dirent for \"%s\" from dir ino #%u\n", + fd->name, + dead_f->inocache->ino); + } + if (fd->raw) + jffs2_mark_node_obsolete(c, fd->raw); + jffs2_free_full_dirent(fd); + } + dead_f->inocache->pino_nlink = 0; + } else + dead_f->inocache->pino_nlink--; + /* NB: Caller must set inode nlink if appropriate */ + mutex_unlock(&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, uint32_t time) +{ + struct jffs2_raw_dirent *rd; + struct jffs2_full_dirent *fd; + uint32_t alloclen; + int ret; + + rd = jffs2_alloc_raw_dirent(); + if (!rd) + return -ENOMEM; + + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, + ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); + if (ret) { + jffs2_free_raw_dirent(rd); + return ret; + } + + mutex_lock(&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(time); + 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, ALLOC_NORMAL); + + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + jffs2_complete_reservation(c); + mutex_unlock(&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); + mutex_unlock(&dir_f->sem); + + return 0; +} |