| /* |
| * JFFS2 -- Journalling Flash File System, Version 2. |
| * |
| * Copyright © 2001-2007 Red Hat, Inc. |
| * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
| * |
| * 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/capability.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/fs.h> |
| #include <linux/list.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/pagemap.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include <linux/vfs.h> |
| #include <linux/crc32.h> |
| #include "nodelist.h" |
| |
| static int jffs2_flash_setup(struct jffs2_sb_info *c); |
| |
| int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
| { |
| struct jffs2_full_dnode *old_metadata, *new_metadata; |
| struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
| struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
| struct jffs2_raw_inode *ri; |
| union jffs2_device_node dev; |
| unsigned char *mdata = NULL; |
| int mdatalen = 0; |
| unsigned int ivalid; |
| uint32_t alloclen; |
| int ret; |
| int alloc_type = ALLOC_NORMAL; |
| |
| jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); |
| |
| /* Special cases - we don't want more than one data node |
| for these types on the medium at any time. So setattr |
| must read the original data associated with the node |
| (i.e. the device numbers or the target name) and write |
| it out again with the appropriate data attached */ |
| if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
| /* For these, we don't actually need to read the old node */ |
| mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
| mdata = (char *)&dev; |
| jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", |
| __func__, mdatalen); |
| } else if (S_ISLNK(inode->i_mode)) { |
| mutex_lock(&f->sem); |
| mdatalen = f->metadata->size; |
| mdata = kmalloc(f->metadata->size, GFP_USER); |
| if (!mdata) { |
| mutex_unlock(&f->sem); |
| return -ENOMEM; |
| } |
| ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
| if (ret) { |
| mutex_unlock(&f->sem); |
| kfree(mdata); |
| return ret; |
| } |
| mutex_unlock(&f->sem); |
| jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", |
| __func__, mdatalen); |
| } |
| |
| ri = jffs2_alloc_raw_inode(); |
| if (!ri) { |
| if (S_ISLNK(inode->i_mode)) |
| kfree(mdata); |
| return -ENOMEM; |
| } |
| |
| ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
| ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
| if (ret) { |
| jffs2_free_raw_inode(ri); |
| if (S_ISLNK(inode->i_mode)) |
| kfree(mdata); |
| return ret; |
| } |
| mutex_lock(&f->sem); |
| ivalid = iattr->ia_valid; |
| |
| ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
| ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); |
| ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| |
| ri->ino = cpu_to_je32(inode->i_ino); |
| ri->version = cpu_to_je32(++f->highest_version); |
| |
| ri->uid = cpu_to_je16((ivalid & ATTR_UID)? |
| from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); |
| ri->gid = cpu_to_je16((ivalid & ATTR_GID)? |
| from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); |
| |
| if (ivalid & ATTR_MODE) |
| ri->mode = cpu_to_jemode(iattr->ia_mode); |
| else |
| ri->mode = cpu_to_jemode(inode->i_mode); |
| |
| |
| ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); |
| ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); |
| ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); |
| ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); |
| |
| ri->offset = cpu_to_je32(0); |
| ri->csize = ri->dsize = cpu_to_je32(mdatalen); |
| ri->compr = JFFS2_COMPR_NONE; |
| if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
| /* It's an extension. Make it a hole node */ |
| ri->compr = JFFS2_COMPR_ZERO; |
| ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); |
| ri->offset = cpu_to_je32(inode->i_size); |
| } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
| /* For truncate-to-zero, treat it as deletion because |
| it'll always be obsoleting all previous nodes */ |
| alloc_type = ALLOC_DELETION; |
| } |
| ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
| if (mdatalen) |
| ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); |
| else |
| ri->data_crc = cpu_to_je32(0); |
| |
| new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
| if (S_ISLNK(inode->i_mode)) |
| kfree(mdata); |
| |
| if (IS_ERR(new_metadata)) { |
| jffs2_complete_reservation(c); |
| jffs2_free_raw_inode(ri); |
| mutex_unlock(&f->sem); |
| return PTR_ERR(new_metadata); |
| } |
| /* It worked. Update the inode */ |
| inode->i_atime = ITIME(je32_to_cpu(ri->atime)); |
| inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
| inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); |
| inode->i_mode = jemode_to_cpu(ri->mode); |
| i_uid_write(inode, je16_to_cpu(ri->uid)); |
| i_gid_write(inode, je16_to_cpu(ri->gid)); |
| |
| |
| old_metadata = f->metadata; |
| |
| if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
| jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
| |
| if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
| jffs2_add_full_dnode_to_inode(c, f, new_metadata); |
| inode->i_size = iattr->ia_size; |
| inode->i_blocks = (inode->i_size + 511) >> 9; |
| f->metadata = NULL; |
| } else { |
| f->metadata = new_metadata; |
| } |
| if (old_metadata) { |
| jffs2_mark_node_obsolete(c, old_metadata->raw); |
| jffs2_free_full_dnode(old_metadata); |
| } |
| jffs2_free_raw_inode(ri); |
| |
| mutex_unlock(&f->sem); |
| jffs2_complete_reservation(c); |
| |
| /* We have to do the truncate_setsize() without f->sem held, since |
| some pages may be locked and waiting for it in readpage(). |
| We are protected from a simultaneous write() extending i_size |
| back past iattr->ia_size, because do_truncate() holds the |
| generic inode semaphore. */ |
| if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
| truncate_setsize(inode, iattr->ia_size); |
| inode->i_blocks = (inode->i_size + 511) >> 9; |
| } |
| |
| return 0; |
| } |
| |
| int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) |
| { |
| struct inode *inode = d_inode(dentry); |
| int rc; |
| |
| rc = setattr_prepare(dentry, iattr); |
| if (rc) |
| return rc; |
| |
| rc = jffs2_do_setattr(inode, iattr); |
| if (!rc && (iattr->ia_valid & ATTR_MODE)) |
| rc = posix_acl_chmod(inode, inode->i_mode); |
| |
| return rc; |
| } |
| |
| int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
| unsigned long avail; |
| |
| buf->f_type = JFFS2_SUPER_MAGIC; |
| buf->f_bsize = 1 << PAGE_SHIFT; |
| buf->f_blocks = c->flash_size >> PAGE_SHIFT; |
| buf->f_files = 0; |
| buf->f_ffree = 0; |
| buf->f_namelen = JFFS2_MAX_NAME_LEN; |
| buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
| buf->f_fsid.val[1] = c->mtd->index; |
| |
| spin_lock(&c->erase_completion_lock); |
| avail = c->dirty_size + c->free_size; |
| if (avail > c->sector_size * c->resv_blocks_write) |
| avail -= c->sector_size * c->resv_blocks_write; |
| else |
| avail = 0; |
| spin_unlock(&c->erase_completion_lock); |
| |
| buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; |
| |
| return 0; |
| } |
| |
| |
| void jffs2_evict_inode (struct inode *inode) |
| { |
| /* We can forget about this inode for now - drop all |
| * the nodelists associated with it, etc. |
| */ |
| struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
| struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
| |
| jffs2_dbg(1, "%s(): ino #%lu mode %o\n", |
| __func__, inode->i_ino, inode->i_mode); |
| truncate_inode_pages_final(&inode->i_data); |
| clear_inode(inode); |
| jffs2_do_clear_inode(c, f); |
| } |
| |
| struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
| { |
| struct jffs2_inode_info *f; |
| struct jffs2_sb_info *c; |
| struct jffs2_raw_inode latest_node; |
| union jffs2_device_node jdev; |
| struct inode *inode; |
| dev_t rdev = 0; |
| int ret; |
| |
| jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); |
| |
| inode = iget_locked(sb, ino); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| |
| f = JFFS2_INODE_INFO(inode); |
| c = JFFS2_SB_INFO(inode->i_sb); |
| |
| jffs2_init_inode_info(f); |
| mutex_lock(&f->sem); |
| |
| ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
| |
| if (ret) { |
| mutex_unlock(&f->sem); |
| iget_failed(inode); |
| return ERR_PTR(ret); |
| } |
| inode->i_mode = jemode_to_cpu(latest_node.mode); |
| i_uid_write(inode, je16_to_cpu(latest_node.uid)); |
| i_gid_write(inode, je16_to_cpu(latest_node.gid)); |
| inode->i_size = je32_to_cpu(latest_node.isize); |
| inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); |
| inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); |
| inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); |
| |
| set_nlink(inode, f->inocache->pino_nlink); |
| |
| inode->i_blocks = (inode->i_size + 511) >> 9; |
| |
| switch (inode->i_mode & S_IFMT) { |
| |
| case S_IFLNK: |
| inode->i_op = &jffs2_symlink_inode_operations; |
| break; |
| |
| case S_IFDIR: |
| { |
| struct jffs2_full_dirent *fd; |
| set_nlink(inode, 2); /* parent and '.' */ |
| |
| for (fd=f->dents; fd; fd = fd->next) { |
| if (fd->type == DT_DIR && fd->ino) |
| inc_nlink(inode); |
| } |
| /* Root dir gets i_nlink 3 for some reason */ |
| if (inode->i_ino == 1) |
| inc_nlink(inode); |
| |
| inode->i_op = &jffs2_dir_inode_operations; |
| inode->i_fop = &jffs2_dir_operations; |
| break; |
| } |
| case S_IFREG: |
| inode->i_op = &jffs2_file_inode_operations; |
| inode->i_fop = &jffs2_file_operations; |
| inode->i_mapping->a_ops = &jffs2_file_address_operations; |
| inode->i_mapping->nrpages = 0; |
| break; |
| |
| case S_IFBLK: |
| case S_IFCHR: |
| /* Read the device numbers from the media */ |
| if (f->metadata->size != sizeof(jdev.old_id) && |
| f->metadata->size != sizeof(jdev.new_id)) { |
| pr_notice("Device node has strange size %d\n", |
| f->metadata->size); |
| goto error_io; |
| } |
| jffs2_dbg(1, "Reading device numbers from flash\n"); |
| ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
| if (ret < 0) { |
| /* Eep */ |
| pr_notice("Read device numbers for inode %lu failed\n", |
| (unsigned long)inode->i_ino); |
| goto error; |
| } |
| if (f->metadata->size == sizeof(jdev.old_id)) |
| rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); |
| else |
| rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
| |
| case S_IFSOCK: |
| case S_IFIFO: |
| inode->i_op = &jffs2_file_inode_operations; |
| init_special_inode(inode, inode->i_mode, rdev); |
| break; |
| |
| default: |
| pr_warn("%s(): Bogus i_mode %o for ino %lu\n", |
| __func__, inode->i_mode, (unsigned long)inode->i_ino); |
| } |
| |
| mutex_unlock(&f->sem); |
| |
| jffs2_dbg(1, "jffs2_read_inode() returning\n"); |
| unlock_new_inode(inode); |
| return inode; |
| |
| error_io: |
| ret = -EIO; |
| error: |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| iget_failed(inode); |
| return ERR_PTR(ret); |
| } |
| |
| void jffs2_dirty_inode(struct inode *inode, int flags) |
| { |
| struct iattr iattr; |
| |
| if (!(inode->i_state & I_DIRTY_DATASYNC)) { |
| jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", |
| __func__, inode->i_ino); |
| return; |
| } |
| |
| jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", |
| __func__, inode->i_ino); |
| |
| iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; |
| iattr.ia_mode = inode->i_mode; |
| iattr.ia_uid = inode->i_uid; |
| iattr.ia_gid = inode->i_gid; |
| iattr.ia_atime = inode->i_atime; |
| iattr.ia_mtime = inode->i_mtime; |
| iattr.ia_ctime = inode->i_ctime; |
| |
| jffs2_do_setattr(inode, &iattr); |
| } |
| |
| int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
| { |
| struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| |
| if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) |
| return -EROFS; |
| |
| /* We stop if it was running, then restart if it needs to. |
| This also catches the case where it was stopped and this |
| is just a remount to restart it. |
| Flush the writebuffer, if neccecary, else we loose it */ |
| if (!(sb->s_flags & MS_RDONLY)) { |
| jffs2_stop_garbage_collect_thread(c); |
| mutex_lock(&c->alloc_sem); |
| jffs2_flush_wbuf_pad(c); |
| mutex_unlock(&c->alloc_sem); |
| } |
| |
| if (!(*flags & MS_RDONLY)) |
| jffs2_start_garbage_collect_thread(c); |
| |
| *flags |= MS_NOATIME; |
| return 0; |
| } |
| |
| /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
| fill in the raw_inode while you're at it. */ |
| struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
| { |
| struct inode *inode; |
| struct super_block *sb = dir_i->i_sb; |
| struct jffs2_sb_info *c; |
| struct jffs2_inode_info *f; |
| int ret; |
| |
| jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", |
| __func__, dir_i->i_ino, mode); |
| |
| c = JFFS2_SB_INFO(sb); |
| |
| inode = new_inode(sb); |
| |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| |
| f = JFFS2_INODE_INFO(inode); |
| jffs2_init_inode_info(f); |
| mutex_lock(&f->sem); |
| |
| memset(ri, 0, sizeof(*ri)); |
| /* Set OS-specific defaults for new inodes */ |
| ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
| |
| if (dir_i->i_mode & S_ISGID) { |
| ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
| if (S_ISDIR(mode)) |
| mode |= S_ISGID; |
| } else { |
| ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
| } |
| |
| /* POSIX ACLs have to be processed now, at least partly. |
| The umask is only applied if there's no default ACL */ |
| ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
| if (ret) { |
| mutex_unlock(&f->sem); |
| make_bad_inode(inode); |
| iput(inode); |
| return ERR_PTR(ret); |
| } |
| ret = jffs2_do_new_inode (c, f, mode, ri); |
| if (ret) { |
| mutex_unlock(&f->sem); |
| make_bad_inode(inode); |
| iput(inode); |
| return ERR_PTR(ret); |
| } |
| set_nlink(inode, 1); |
| inode->i_ino = je32_to_cpu(ri->ino); |
| inode->i_mode = jemode_to_cpu(ri->mode); |
| i_gid_write(inode, je16_to_cpu(ri->gid)); |
| i_uid_write(inode, je16_to_cpu(ri->uid)); |
| inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; |
| ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); |
| |
| inode->i_blocks = 0; |
| inode->i_size = 0; |
| |
| if (insert_inode_locked(inode) < 0) { |
| mutex_unlock(&f->sem); |
| make_bad_inode(inode); |
| iput(inode); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| return inode; |
| } |
| |
| static int calculate_inocache_hashsize(uint32_t flash_size) |
| { |
| /* |
| * Pick a inocache hash size based on the size of the medium. |
| * Count how many megabytes we're dealing with, apply a hashsize twice |
| * that size, but rounding down to the usual big powers of 2. And keep |
| * to sensible bounds. |
| */ |
| |
| int size_mb = flash_size / 1024 / 1024; |
| int hashsize = (size_mb * 2) & ~0x3f; |
| |
| if (hashsize < INOCACHE_HASHSIZE_MIN) |
| return INOCACHE_HASHSIZE_MIN; |
| if (hashsize > INOCACHE_HASHSIZE_MAX) |
| return INOCACHE_HASHSIZE_MAX; |
| |
| return hashsize; |
| } |
| |
| int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct jffs2_sb_info *c; |
| struct inode *root_i; |
| int ret; |
| size_t blocks; |
| |
| c = JFFS2_SB_INFO(sb); |
| |
| /* Do not support the MLC nand */ |
| if (c->mtd->type == MTD_MLCNANDFLASH) |
| return -EINVAL; |
| |
| #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
| if (c->mtd->type == MTD_NANDFLASH) { |
| pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); |
| return -EINVAL; |
| } |
| if (c->mtd->type == MTD_DATAFLASH) { |
| pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); |
| return -EINVAL; |
| } |
| #endif |
| |
| c->flash_size = c->mtd->size; |
| c->sector_size = c->mtd->erasesize; |
| blocks = c->flash_size / c->sector_size; |
| |
| /* |
| * Size alignment check |
| */ |
| if ((c->sector_size * blocks) != c->flash_size) { |
| c->flash_size = c->sector_size * blocks; |
| pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", |
| c->flash_size / 1024); |
| } |
| |
| if (c->flash_size < 5*c->sector_size) { |
| pr_err("Too few erase blocks (%d)\n", |
| c->flash_size / c->sector_size); |
| return -EINVAL; |
| } |
| |
| c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
| |
| /* NAND (or other bizarre) flash... do setup accordingly */ |
| ret = jffs2_flash_setup(c); |
| if (ret) |
| return ret; |
| |
| c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
| c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
| if (!c->inocache_list) { |
| ret = -ENOMEM; |
| goto out_wbuf; |
| } |
| |
| jffs2_init_xattr_subsystem(c); |
| |
| if ((ret = jffs2_do_mount_fs(c))) |
| goto out_inohash; |
| |
| jffs2_dbg(1, "%s(): Getting root inode\n", __func__); |
| root_i = jffs2_iget(sb, 1); |
| if (IS_ERR(root_i)) { |
| jffs2_dbg(1, "get root inode failed\n"); |
| ret = PTR_ERR(root_i); |
| goto out_root; |
| } |
| |
| ret = -ENOMEM; |
| |
| jffs2_dbg(1, "%s(): d_make_root()\n", __func__); |
| sb->s_root = d_make_root(root_i); |
| if (!sb->s_root) |
| goto out_root; |
| |
| sb->s_maxbytes = 0xFFFFFFFF; |
| sb->s_blocksize = PAGE_CACHE_SIZE; |
| sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| sb->s_magic = JFFS2_SUPER_MAGIC; |
| if (!(sb->s_flags & MS_RDONLY)) |
| jffs2_start_garbage_collect_thread(c); |
| return 0; |
| |
| out_root: |
| jffs2_free_ino_caches(c); |
| jffs2_free_raw_node_refs(c); |
| if (jffs2_blocks_use_vmalloc(c)) |
| vfree(c->blocks); |
| else |
| kfree(c->blocks); |
| out_inohash: |
| jffs2_clear_xattr_subsystem(c); |
| kfree(c->inocache_list); |
| out_wbuf: |
| jffs2_flash_cleanup(c); |
| |
| return ret; |
| } |
| |
| void jffs2_gc_release_inode(struct jffs2_sb_info *c, |
| struct jffs2_inode_info *f) |
| { |
| iput(OFNI_EDONI_2SFFJ(f)); |
| } |
| |
| struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, |
| int inum, int unlinked) |
| { |
| struct inode *inode; |
| struct jffs2_inode_cache *ic; |
| |
| if (unlinked) { |
| /* The inode has zero nlink but its nodes weren't yet marked |
| obsolete. This has to be because we're still waiting for |
| the final (close() and) iput() to happen. |
| |
| There's a possibility that the final iput() could have |
| happened while we were contemplating. In order to ensure |
| that we don't cause a new read_inode() (which would fail) |
| for the inode in question, we use ilookup() in this case |
| instead of iget(). |
| |
| The nlink can't _become_ zero at this point because we're |
| holding the alloc_sem, and jffs2_do_unlink() would also |
| need that while decrementing nlink on any inode. |
| */ |
| inode = ilookup(OFNI_BS_2SFFJ(c), inum); |
| if (!inode) { |
| jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
| inum); |
| |
| spin_lock(&c->inocache_lock); |
| ic = jffs2_get_ino_cache(c, inum); |
| if (!ic) { |
| jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
| inum); |
| spin_unlock(&c->inocache_lock); |
| return NULL; |
| } |
| if (ic->state != INO_STATE_CHECKEDABSENT) { |
| /* Wait for progress. Don't just loop */ |
| jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
| ic->ino, ic->state); |
| sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
| } else { |
| spin_unlock(&c->inocache_lock); |
| } |
| |
| return NULL; |
| } |
| } else { |
| /* Inode has links to it still; they're not going away because |
| jffs2_do_unlink() would need the alloc_sem and we have it. |
| Just iget() it, and if read_inode() is necessary that's OK. |
| */ |
| inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| } |
| if (is_bad_inode(inode)) { |
| pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", |
| inum, unlinked); |
| /* NB. This will happen again. We need to do something appropriate here. */ |
| iput(inode); |
| return ERR_PTR(-EIO); |
| } |
| |
| return JFFS2_INODE_INFO(inode); |
| } |
| |
| unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
| struct jffs2_inode_info *f, |
| unsigned long offset, |
| unsigned long *priv) |
| { |
| struct inode *inode = OFNI_EDONI_2SFFJ(f); |
| struct page *pg; |
| |
| pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
| (void *)jffs2_do_readpage_unlock, inode); |
| if (IS_ERR(pg)) |
| return (void *)pg; |
| |
| *priv = (unsigned long)pg; |
| return kmap(pg); |
| } |
| |
| void jffs2_gc_release_page(struct jffs2_sb_info *c, |
| unsigned char *ptr, |
| unsigned long *priv) |
| { |
| struct page *pg = (void *)*priv; |
| |
| kunmap(pg); |
| page_cache_release(pg); |
| } |
| |
| static int jffs2_flash_setup(struct jffs2_sb_info *c) { |
| int ret = 0; |
| |
| if (jffs2_cleanmarker_oob(c)) { |
| /* NAND flash... do setup accordingly */ |
| ret = jffs2_nand_flash_setup(c); |
| if (ret) |
| return ret; |
| } |
| |
| /* and Dataflash */ |
| if (jffs2_dataflash(c)) { |
| ret = jffs2_dataflash_setup(c); |
| if (ret) |
| return ret; |
| } |
| |
| /* and Intel "Sibley" flash */ |
| if (jffs2_nor_wbuf_flash(c)) { |
| ret = jffs2_nor_wbuf_flash_setup(c); |
| if (ret) |
| return ret; |
| } |
| |
| /* and an UBI volume */ |
| if (jffs2_ubivol(c)) { |
| ret = jffs2_ubivol_setup(c); |
| if (ret) |
| return ret; |
| } |
| |
| return ret; |
| } |
| |
| void jffs2_flash_cleanup(struct jffs2_sb_info *c) { |
| |
| if (jffs2_cleanmarker_oob(c)) { |
| jffs2_nand_flash_cleanup(c); |
| } |
| |
| /* and DataFlash */ |
| if (jffs2_dataflash(c)) { |
| jffs2_dataflash_cleanup(c); |
| } |
| |
| /* and Intel "Sibley" flash */ |
| if (jffs2_nor_wbuf_flash(c)) { |
| jffs2_nor_wbuf_flash_cleanup(c); |
| } |
| |
| /* and an UBI volume */ |
| if (jffs2_ubivol(c)) { |
| jffs2_ubivol_cleanup(c); |
| } |
| } |