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fs/jffs2/fs.c
19.8 KB
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/* * JFFS2 -- Journalling Flash File System, Version 2. * |
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* Copyright © 2001-2007 Red Hat, Inc. |
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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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* * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/capability.h> |
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#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); |
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int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
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{ 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; |
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union jffs2_device_node dev; |
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unsigned char *mdata = NULL; int mdatalen = 0; unsigned int ivalid; |
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uint32_t alloclen; |
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int ret; |
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int alloc_type = ALLOC_NORMAL; |
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jffs2_dbg(1, "%s(): ino #%lu ", __func__, inode->i_ino); |
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/* 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 */ |
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mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
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mdata = (char *)&dev; |
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jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t ", __func__, mdatalen); |
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} else if (S_ISLNK(inode->i_mode)) { |
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mutex_lock(&f->sem); |
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mdatalen = f->metadata->size; mdata = kmalloc(f->metadata->size, GFP_USER); |
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if (!mdata) { |
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mutex_unlock(&f->sem); |
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return -ENOMEM; |
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} |
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ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); if (ret) { |
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mutex_unlock(&f->sem); |
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kfree(mdata); return ret; } |
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mutex_unlock(&f->sem); |
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jffs2_dbg(1, "%s(): Writing %d bytes of symlink target ", __func__, mdatalen); |
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} ri = jffs2_alloc_raw_inode(); if (!ri) { if (S_ISLNK(inode->i_mode)) kfree(mdata); return -ENOMEM; } |
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ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
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if (ret) { jffs2_free_raw_inode(ri); |
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if (S_ISLNK(inode->i_mode)) |
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kfree(mdata); return ret; } |
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mutex_lock(&f->sem); |
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ivalid = iattr->ia_valid; |
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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); |
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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)); |
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if (ivalid & ATTR_MODE) |
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ri->mode = cpu_to_jemode(iattr->ia_mode); |
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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); |
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} 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; |
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} 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); |
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new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
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if (S_ISLNK(inode->i_mode)) kfree(mdata); |
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if (IS_ERR(new_metadata)) { jffs2_complete_reservation(c); jffs2_free_raw_inode(ri); |
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mutex_unlock(&f->sem); |
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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); |
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i_uid_write(inode, je16_to_cpu(ri->uid)); i_gid_write(inode, je16_to_cpu(ri->gid)); |
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old_metadata = f->metadata; if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
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jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
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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; |
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inode->i_blocks = (inode->i_size + 511) >> 9; |
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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); |
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mutex_unlock(&f->sem); |
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jffs2_complete_reservation(c); |
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/* We have to do the truncate_setsize() without f->sem held, since |
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some pages may be locked and waiting for it in readpage(). |
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We are protected from a simultaneous write() extending i_size back past iattr->ia_size, because do_truncate() holds the generic inode semaphore. */ |
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if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
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truncate_setsize(inode, iattr->ia_size); |
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inode->i_blocks = (inode->i_size + 511) >> 9; } |
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return 0; } int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) { |
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int rc; |
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rc = inode_change_ok(dentry->d_inode, iattr); if (rc) return rc; |
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rc = jffs2_do_setattr(dentry->d_inode, iattr); if (!rc && (iattr->ia_valid & ATTR_MODE)) rc = jffs2_acl_chmod(dentry->d_inode); |
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return rc; |
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} |
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int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
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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; |
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buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; buf->f_fsid.val[1] = c->mtd->index; |
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spin_lock(&c->erase_completion_lock); |
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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; |
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spin_unlock(&c->erase_completion_lock); |
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buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; |
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return 0; } |
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void jffs2_evict_inode (struct inode *inode) |
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{ |
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/* We can forget about this inode for now - drop all |
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* 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); |
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jffs2_dbg(1, "%s(): ino #%lu mode %o ", __func__, inode->i_ino, inode->i_mode); |
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truncate_inode_pages(&inode->i_data, 0); |
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clear_inode(inode); |
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jffs2_do_clear_inode(c, f); } |
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struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
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{ struct jffs2_inode_info *f; struct jffs2_sb_info *c; struct jffs2_raw_inode latest_node; |
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union jffs2_device_node jdev; |
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struct inode *inode; |
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dev_t rdev = 0; |
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int ret; |
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jffs2_dbg(1, "%s(): ino == %lu ", __func__, ino); |
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inode = iget_locked(sb, ino); if (!inode) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; |
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f = JFFS2_INODE_INFO(inode); c = JFFS2_SB_INFO(inode->i_sb); jffs2_init_inode_info(f); |
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mutex_lock(&f->sem); |
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ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); if (ret) { |
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mutex_unlock(&f->sem); |
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iget_failed(inode); return ERR_PTR(ret); |
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} inode->i_mode = jemode_to_cpu(latest_node.mode); |
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i_uid_write(inode, je16_to_cpu(latest_node.uid)); i_gid_write(inode, je16_to_cpu(latest_node.gid)); |
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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)); |
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set_nlink(inode, f->inocache->pino_nlink); |
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inode->i_blocks = (inode->i_size + 511) >> 9; |
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switch (inode->i_mode & S_IFMT) { |
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case S_IFLNK: inode->i_op = &jffs2_symlink_inode_operations; break; |
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case S_IFDIR: { struct jffs2_full_dirent *fd; |
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set_nlink(inode, 2); /* parent and '.' */ |
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for (fd=f->dents; fd; fd = fd->next) { if (fd->type == DT_DIR && fd->ino) |
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inc_nlink(inode); |
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} |
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/* Root dir gets i_nlink 3 for some reason */ if (inode->i_ino == 1) |
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inc_nlink(inode); |
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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 */ |
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if (f->metadata->size != sizeof(jdev.old_id) && f->metadata->size != sizeof(jdev.new_id)) { |
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pr_notice("Device node has strange size %d ", f->metadata->size); |
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goto error_io; |
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} |
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jffs2_dbg(1, "Reading device numbers from flash "); |
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ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); if (ret < 0) { |
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/* Eep */ |
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pr_notice("Read device numbers for inode %lu failed ", (unsigned long)inode->i_ino); |
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goto error; |
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} |
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if (f->metadata->size == sizeof(jdev.old_id)) rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); |
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else |
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rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
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case S_IFSOCK: case S_IFIFO: inode->i_op = &jffs2_file_inode_operations; |
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init_special_inode(inode, inode->i_mode, rdev); |
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break; default: |
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pr_warn("%s(): Bogus i_mode %o for ino %lu ", __func__, inode->i_mode, (unsigned long)inode->i_ino); |
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} |
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mutex_unlock(&f->sem); |
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jffs2_dbg(1, "jffs2_read_inode() returning "); |
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unlock_new_inode(inode); return inode; error_io: ret = -EIO; error: |
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mutex_unlock(&f->sem); |
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jffs2_do_clear_inode(c, f); iget_failed(inode); return ERR_PTR(ret); |
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} |
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void jffs2_dirty_inode(struct inode *inode, int flags) |
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{ struct iattr iattr; if (!(inode->i_state & I_DIRTY_DATASYNC)) { |
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jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu ", __func__, inode->i_ino); |
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return; } |
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jffs2_dbg(1, "%s(): calling setattr() for ino #%lu ", __func__, inode->i_ino); |
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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); } |
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int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
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{ 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); |
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mutex_lock(&c->alloc_sem); |
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jffs2_flush_wbuf_pad(c); |
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mutex_unlock(&c->alloc_sem); |
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} |
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if (!(*flags & MS_RDONLY)) jffs2_start_garbage_collect_thread(c); |
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*flags |= MS_NOATIME; |
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return 0; } |
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/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, fill in the raw_inode while you're at it. */ |
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struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
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{ struct inode *inode; struct super_block *sb = dir_i->i_sb; struct jffs2_sb_info *c; struct jffs2_inode_info *f; int ret; |
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jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x ", __func__, dir_i->i_ino, mode); |
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c = JFFS2_SB_INFO(sb); |
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inode = new_inode(sb); |
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if (!inode) return ERR_PTR(-ENOMEM); f = JFFS2_INODE_INFO(inode); jffs2_init_inode_info(f); |
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mutex_lock(&f->sem); |
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memset(ri, 0, sizeof(*ri)); /* Set OS-specific defaults for new inodes */ |
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ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
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if (dir_i->i_mode & S_ISGID) { |
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ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
1da177e4c
|
440 441 442 |
if (S_ISDIR(mode)) mode |= S_ISGID; } else { |
0cfe53d3c
|
443 |
ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
1da177e4c
|
444 |
} |
9ed437c50
|
445 446 447 |
/* POSIX ACLs have to be processed now, at least partly. The umask is only applied if there's no default ACL */ |
cfc8dc6f6
|
448 449 450 451 452 |
ret = jffs2_init_acl_pre(dir_i, inode, &mode); if (ret) { make_bad_inode(inode); iput(inode); return ERR_PTR(ret); |
9ed437c50
|
453 |
} |
1da177e4c
|
454 455 456 457 458 459 |
ret = jffs2_do_new_inode (c, f, mode, ri); if (ret) { make_bad_inode(inode); iput(inode); return ERR_PTR(ret); } |
bfe868486
|
460 |
set_nlink(inode, 1); |
1da177e4c
|
461 462 |
inode->i_ino = je32_to_cpu(ri->ino); inode->i_mode = jemode_to_cpu(ri->mode); |
0cfe53d3c
|
463 464 |
i_gid_write(inode, je16_to_cpu(ri->gid)); i_uid_write(inode, je16_to_cpu(ri->uid)); |
1da177e4c
|
465 466 |
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)); |
1da177e4c
|
467 468 |
inode->i_blocks = 0; inode->i_size = 0; |
e72e6497e
|
469 470 |
if (insert_inode_locked(inode) < 0) { make_bad_inode(inode); |
e72e6497e
|
471 472 473 |
iput(inode); return ERR_PTR(-EINVAL); } |
1da177e4c
|
474 475 476 |
return inode; } |
65e5a0e18
|
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 |
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; } |
1da177e4c
|
496 497 498 499 500 501 502 503 504 |
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); |
2f82ce1eb
|
505 |
#ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4c
|
506 |
if (c->mtd->type == MTD_NANDFLASH) { |
5a528957e
|
507 508 |
pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in "); |
1da177e4c
|
509 510 |
return -EINVAL; } |
8f15fd55f
|
511 |
if (c->mtd->type == MTD_DATAFLASH) { |
5a528957e
|
512 513 |
pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in "); |
8f15fd55f
|
514 515 516 |
return -EINVAL; } #endif |
1da177e4c
|
517 518 |
c->flash_size = c->mtd->size; |
182ec4eee
|
519 |
c->sector_size = c->mtd->erasesize; |
1da177e4c
|
520 |
blocks = c->flash_size / c->sector_size; |
1da177e4c
|
521 522 523 524 525 |
/* * Size alignment check */ if ((c->sector_size * blocks) != c->flash_size) { |
182ec4eee
|
526 |
c->flash_size = c->sector_size * blocks; |
5a528957e
|
527 528 |
pr_info("Flash size not aligned to erasesize, reducing to %dKiB ", |
1da177e4c
|
529 530 |
c->flash_size / 1024); } |
1da177e4c
|
531 |
if (c->flash_size < 5*c->sector_size) { |
5a528957e
|
532 533 |
pr_err("Too few erase blocks (%d) ", |
da320f055
|
534 |
c->flash_size / c->sector_size); |
1da177e4c
|
535 536 537 538 |
return -EINVAL; } c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
1da177e4c
|
539 540 541 542 543 |
/* NAND (or other bizarre) flash... do setup accordingly */ ret = jffs2_flash_setup(c); if (ret) return ret; |
65e5a0e18
|
544 545 |
c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
1da177e4c
|
546 547 548 549 |
if (!c->inocache_list) { ret = -ENOMEM; goto out_wbuf; } |
1da177e4c
|
550 |
|
aa98d7cf5
|
551 |
jffs2_init_xattr_subsystem(c); |
1da177e4c
|
552 553 |
if ((ret = jffs2_do_mount_fs(c))) goto out_inohash; |
9c261b33a
|
554 555 |
jffs2_dbg(1, "%s(): Getting root inode ", __func__); |
5451f79f5
|
556 557 |
root_i = jffs2_iget(sb, 1); if (IS_ERR(root_i)) { |
9c261b33a
|
558 559 |
jffs2_dbg(1, "get root inode failed "); |
5451f79f5
|
560 561 |
ret = PTR_ERR(root_i); goto out_root; |
1da177e4c
|
562 |
} |
5451f79f5
|
563 |
ret = -ENOMEM; |
623ff7739
|
564 565 |
jffs2_dbg(1, "%s(): d_make_root() ", __func__); |
48fde701a
|
566 |
sb->s_root = d_make_root(root_i); |
1da177e4c
|
567 |
if (!sb->s_root) |
48fde701a
|
568 |
goto out_root; |
1da177e4c
|
569 |
|
1da177e4c
|
570 |
sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4c
|
571 572 573 574 575 576 |
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; |
5451f79f5
|
577 |
out_root: |
1da177e4c
|
578 579 |
jffs2_free_ino_caches(c); jffs2_free_raw_node_refs(c); |
4ce1f5621
|
580 |
if (jffs2_blocks_use_vmalloc(c)) |
1da177e4c
|
581 582 583 584 |
vfree(c->blocks); else kfree(c->blocks); out_inohash: |
aa98d7cf5
|
585 |
jffs2_clear_xattr_subsystem(c); |
1da177e4c
|
586 587 588 589 590 591 592 593 594 595 596 597 598 599 |
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, |
1b690b487
|
600 |
int inum, int unlinked) |
1da177e4c
|
601 602 603 |
{ struct inode *inode; struct jffs2_inode_cache *ic; |
1b690b487
|
604 605 |
if (unlinked) { |
1da177e4c
|
606 |
/* The inode has zero nlink but its nodes weren't yet marked |
182ec4eee
|
607 |
obsolete. This has to be because we're still waiting for |
1da177e4c
|
608 |
the final (close() and) iput() to happen. |
182ec4eee
|
609 |
There's a possibility that the final iput() could have |
1da177e4c
|
610 611 612 613 |
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(). |
182ec4eee
|
614 |
The nlink can't _become_ zero at this point because we're |
1da177e4c
|
615 616 617 618 619 |
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) { |
9c261b33a
|
620 621 622 |
jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted. ", inum); |
1da177e4c
|
623 624 625 626 |
spin_lock(&c->inocache_lock); ic = jffs2_get_ino_cache(c, inum); if (!ic) { |
9c261b33a
|
627 628 629 |
jffs2_dbg(1, "Inode cache for ino #%u is gone ", inum); |
1da177e4c
|
630 631 632 633 634 |
spin_unlock(&c->inocache_lock); return NULL; } if (ic->state != INO_STATE_CHECKEDABSENT) { /* Wait for progress. Don't just loop */ |
9c261b33a
|
635 636 637 |
jffs2_dbg(1, "Waiting for ino #%u in state %d ", ic->ino, ic->state); |
1da177e4c
|
638 639 640 641 642 643 644 645 646 647 648 649 |
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. */ |
5451f79f5
|
650 651 652 |
inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); if (IS_ERR(inode)) return ERR_CAST(inode); |
1da177e4c
|
653 654 |
} if (is_bad_inode(inode)) { |
da320f055
|
655 656 657 |
pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d ", inum, unlinked); |
1da177e4c
|
658 659 660 661 662 663 664 |
/* NB. This will happen again. We need to do something appropriate here. */ iput(inode); return ERR_PTR(-EIO); } return JFFS2_INODE_INFO(inode); } |
182ec4eee
|
665 666 |
unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
1da177e4c
|
667 668 669 670 671 |
unsigned long offset, unsigned long *priv) { struct inode *inode = OFNI_EDONI_2SFFJ(f); struct page *pg; |
fc0e01974
|
672 |
pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4c
|
673 674 675 |
(void *)jffs2_do_readpage_unlock, inode); if (IS_ERR(pg)) return (void *)pg; |
182ec4eee
|
676 |
|
1da177e4c
|
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
*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; |
182ec4eee
|
693 |
|
1da177e4c
|
694 695 696 697 698 699 |
if (jffs2_cleanmarker_oob(c)) { /* NAND flash... do setup accordingly */ ret = jffs2_nand_flash_setup(c); if (ret) return ret; } |
8f15fd55f
|
700 701 702 703 704 705 |
/* and Dataflash */ if (jffs2_dataflash(c)) { ret = jffs2_dataflash_setup(c); if (ret) return ret; } |
59da721a2
|
706 707 708 709 710 711 712 |
/* and Intel "Sibley" flash */ if (jffs2_nor_wbuf_flash(c)) { ret = jffs2_nor_wbuf_flash_setup(c); if (ret) return ret; } |
0029da3bf
|
713 714 715 716 717 718 |
/* and an UBI volume */ if (jffs2_ubivol(c)) { ret = jffs2_ubivol_setup(c); if (ret) return ret; } |
1da177e4c
|
719 720 721 722 723 724 725 726 |
return ret; } void jffs2_flash_cleanup(struct jffs2_sb_info *c) { if (jffs2_cleanmarker_oob(c)) { jffs2_nand_flash_cleanup(c); } |
8f15fd55f
|
727 728 729 730 |
/* and DataFlash */ if (jffs2_dataflash(c)) { jffs2_dataflash_cleanup(c); } |
59da721a2
|
731 732 733 734 735 |
/* and Intel "Sibley" flash */ if (jffs2_nor_wbuf_flash(c)) { jffs2_nor_wbuf_flash_cleanup(c); } |
0029da3bf
|
736 737 738 739 740 |
/* and an UBI volume */ if (jffs2_ubivol(c)) { jffs2_ubivol_cleanup(c); } |
1da177e4c
|
741 |
} |