v4.19.13 snapshot.
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
new file mode 100644
index 0000000..eab04ec
--- /dev/null
+++ b/fs/jffs2/fs.c
@@ -0,0 +1,761 @@
+/*
+ * 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/cred.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)
+ goto error;
+
+ 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;
+ inode->i_link = f->target;
+ 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);
+ 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_rdonly(sb))
+ 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_rdonly(sb)) {
+ jffs2_stop_garbage_collect_thread(c);
+ mutex_lock(&c->alloc_sem);
+ jffs2_flush_wbuf_pad(c);
+ mutex_unlock(&c->alloc_sem);
+ }
+
+ if (!(*flags & SB_RDONLY))
+ jffs2_start_garbage_collect_thread(c);
+
+ *flags |= SB_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(inode);
+ 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_SIZE;
+ sb->s_blocksize_bits = PAGE_SHIFT;
+ sb->s_magic = JFFS2_SUPER_MAGIC;
+ if (!sb_rdonly(sb))
+ jffs2_start_garbage_collect_thread(c);
+ return 0;
+
+out_root:
+ jffs2_free_ino_caches(c);
+ jffs2_free_raw_node_refs(c);
+ kvfree(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_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);
+ put_page(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);
+ }
+}