diff options
Diffstat (limited to 'fs/jffs2/fs.c')
| -rw-r--r-- | fs/jffs2/fs.c | 766 |
1 files changed, 766 insertions, 0 deletions
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c new file mode 100644 index 000000000..fe5ea080b --- /dev/null +++ b/fs/jffs2/fs.c @@ -0,0 +1,766 @@ +/* + * 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 = inode_change_ok(inode, 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); + } +} |