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fs/jffs2/fs.c
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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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#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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|
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D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu ", 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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D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t ", mdatalen)); } 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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D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target ", mdatalen)); } ri = jffs2_alloc_raw_inode(); if (!ri) { if (S_ISLNK(inode->i_mode)) kfree(mdata); return -ENOMEM; } |
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|
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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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|
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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); ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); 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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|
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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); inode->i_uid = je16_to_cpu(ri->uid); inode->i_gid = je16_to_cpu(ri->gid); 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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|
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D1(printk(KERN_DEBUG "jffs2_evict_inode(): ino #%lu mode %o ", inode->i_ino, inode->i_mode)); truncate_inode_pages(&inode->i_data, 0); end_writeback(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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D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu ", ino)); 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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|
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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); inode->i_uid = je16_to_cpu(latest_node.uid); inode->i_gid = 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)); |
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set_nlink(inode, f->inocache->pino_nlink); |
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|
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inode->i_blocks = (inode->i_size + 511) >> 9; |
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|
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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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printk(KERN_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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D1(printk(KERN_DEBUG "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 */ printk(KERN_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: printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu ", inode->i_mode, (unsigned long)inode->i_ino); } |
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mutex_unlock(&f->sem); |
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D1(printk(KERN_DEBUG "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)) { D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu ", inode->i_ino)); return; } D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu ", 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); } |
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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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392 |
mutex_unlock(&c->alloc_sem); |
182ec4eee [JFFS2] Clean up ... |
393 |
} |
1da177e4c Linux-2.6.12-rc2 |
394 395 396 |
if (!(*flags & MS_RDONLY)) jffs2_start_garbage_collect_thread(c); |
182ec4eee [JFFS2] Clean up ... |
397 |
|
1da177e4c Linux-2.6.12-rc2 |
398 |
*flags |= MS_NOATIME; |
1da177e4c Linux-2.6.12-rc2 |
399 400 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
401 402 |
/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, fill in the raw_inode while you're at it. */ |
d3fb61207 switch posix_acl_... |
403 |
struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
1da177e4c Linux-2.6.12-rc2 |
404 405 406 407 408 409 410 411 412 413 414 |
{ struct inode *inode; struct super_block *sb = dir_i->i_sb; struct jffs2_sb_info *c; struct jffs2_inode_info *f; int ret; D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x ", dir_i->i_ino, mode)); c = JFFS2_SB_INFO(sb); |
182ec4eee [JFFS2] Clean up ... |
415 |
|
1da177e4c Linux-2.6.12-rc2 |
416 |
inode = new_inode(sb); |
182ec4eee [JFFS2] Clean up ... |
417 |
|
1da177e4c Linux-2.6.12-rc2 |
418 419 420 421 422 |
if (!inode) return ERR_PTR(-ENOMEM); f = JFFS2_INODE_INFO(inode); jffs2_init_inode_info(f); |
ced220703 [JFFS2] semaphore... |
423 |
mutex_lock(&f->sem); |
1da177e4c Linux-2.6.12-rc2 |
424 425 426 |
memset(ri, 0, sizeof(*ri)); /* Set OS-specific defaults for new inodes */ |
3fc678a0e CRED: Wrap task c... |
427 |
ri->uid = cpu_to_je16(current_fsuid()); |
1da177e4c Linux-2.6.12-rc2 |
428 429 430 431 432 433 |
if (dir_i->i_mode & S_ISGID) { ri->gid = cpu_to_je16(dir_i->i_gid); if (S_ISDIR(mode)) mode |= S_ISGID; } else { |
3fc678a0e CRED: Wrap task c... |
434 |
ri->gid = cpu_to_je16(current_fsgid()); |
1da177e4c Linux-2.6.12-rc2 |
435 |
} |
9ed437c50 [JFFS2] Fix ACL v... |
436 437 438 |
/* POSIX ACLs have to be processed now, at least partly. The umask is only applied if there's no default ACL */ |
cfc8dc6f6 [JFFS2] Tidy up f... |
439 440 441 442 443 |
ret = jffs2_init_acl_pre(dir_i, inode, &mode); if (ret) { make_bad_inode(inode); iput(inode); return ERR_PTR(ret); |
9ed437c50 [JFFS2] Fix ACL v... |
444 |
} |
1da177e4c Linux-2.6.12-rc2 |
445 446 447 448 449 450 |
ret = jffs2_do_new_inode (c, f, mode, ri); if (ret) { make_bad_inode(inode); iput(inode); return ERR_PTR(ret); } |
bfe868486 filesystems: add ... |
451 |
set_nlink(inode, 1); |
1da177e4c Linux-2.6.12-rc2 |
452 453 454 455 456 457 |
inode->i_ino = je32_to_cpu(ri->ino); inode->i_mode = jemode_to_cpu(ri->mode); inode->i_gid = je16_to_cpu(ri->gid); inode->i_uid = 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)); |
1da177e4c Linux-2.6.12-rc2 |
458 459 |
inode->i_blocks = 0; inode->i_size = 0; |
e72e6497e jffs2: Fix NFS ra... |
460 461 |
if (insert_inode_locked(inode) < 0) { make_bad_inode(inode); |
e72e6497e jffs2: Fix NFS ra... |
462 463 464 |
iput(inode); return ERR_PTR(-EINVAL); } |
1da177e4c Linux-2.6.12-rc2 |
465 466 467 |
return inode; } |
65e5a0e18 jffs2: Dynamicall... |
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 |
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 Linux-2.6.12-rc2 |
487 488 489 490 491 492 493 494 495 |
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 [JFFS2] Use a sin... |
496 |
#ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4c Linux-2.6.12-rc2 |
497 498 499 500 501 |
if (c->mtd->type == MTD_NANDFLASH) { printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in. "); return -EINVAL; } |
8f15fd55f [JFFS2] Add suppo... |
502 503 504 505 506 507 |
if (c->mtd->type == MTD_DATAFLASH) { printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in. "); return -EINVAL; } #endif |
1da177e4c Linux-2.6.12-rc2 |
508 509 |
c->flash_size = c->mtd->size; |
182ec4eee [JFFS2] Clean up ... |
510 |
c->sector_size = c->mtd->erasesize; |
1da177e4c Linux-2.6.12-rc2 |
511 |
blocks = c->flash_size / c->sector_size; |
1da177e4c Linux-2.6.12-rc2 |
512 513 514 515 516 |
/* * Size alignment check */ if ((c->sector_size * blocks) != c->flash_size) { |
182ec4eee [JFFS2] Clean up ... |
517 |
c->flash_size = c->sector_size * blocks; |
1da177e4c Linux-2.6.12-rc2 |
518 519 520 521 |
printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB ", c->flash_size / 1024); } |
1da177e4c Linux-2.6.12-rc2 |
522 523 524 525 526 527 528 |
if (c->flash_size < 5*c->sector_size) { printk(KERN_ERR "jffs2: Too few erase blocks (%d) ", c->flash_size / c->sector_size); return -EINVAL; } c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
1da177e4c Linux-2.6.12-rc2 |
529 530 531 532 533 |
/* NAND (or other bizarre) flash... do setup accordingly */ ret = jffs2_flash_setup(c); if (ret) return ret; |
65e5a0e18 jffs2: Dynamicall... |
534 535 |
c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
536 537 538 539 |
if (!c->inocache_list) { ret = -ENOMEM; goto out_wbuf; } |
1da177e4c Linux-2.6.12-rc2 |
540 |
|
aa98d7cf5 [JFFS2][XATTR] XA... |
541 |
jffs2_init_xattr_subsystem(c); |
1da177e4c Linux-2.6.12-rc2 |
542 543 |
if ((ret = jffs2_do_mount_fs(c))) goto out_inohash; |
1da177e4c Linux-2.6.12-rc2 |
544 545 |
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode ")); |
5451f79f5 iget: stop JFFS2 ... |
546 547 |
root_i = jffs2_iget(sb, 1); if (IS_ERR(root_i)) { |
1da177e4c Linux-2.6.12-rc2 |
548 549 |
D1(printk(KERN_WARNING "get root inode failed ")); |
5451f79f5 iget: stop JFFS2 ... |
550 551 |
ret = PTR_ERR(root_i); goto out_root; |
1da177e4c Linux-2.6.12-rc2 |
552 |
} |
5451f79f5 iget: stop JFFS2 ... |
553 |
ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
554 555 556 557 558 |
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root() ")); sb->s_root = d_alloc_root(root_i); if (!sb->s_root) goto out_root_i; |
1da177e4c Linux-2.6.12-rc2 |
559 |
sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 565 566 567 568 |
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_i: iput(root_i); |
5451f79f5 iget: stop JFFS2 ... |
569 |
out_root: |
1da177e4c Linux-2.6.12-rc2 |
570 571 |
jffs2_free_ino_caches(c); jffs2_free_raw_node_refs(c); |
4ce1f5621 [JFFS2] Remove su... |
572 |
if (jffs2_blocks_use_vmalloc(c)) |
1da177e4c Linux-2.6.12-rc2 |
573 574 575 576 |
vfree(c->blocks); else kfree(c->blocks); out_inohash: |
aa98d7cf5 [JFFS2][XATTR] XA... |
577 |
jffs2_clear_xattr_subsystem(c); |
1da177e4c Linux-2.6.12-rc2 |
578 579 580 581 582 583 584 585 586 587 588 589 590 591 |
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 [JFFS2] Invert la... |
592 |
int inum, int unlinked) |
1da177e4c Linux-2.6.12-rc2 |
593 594 595 |
{ struct inode *inode; struct jffs2_inode_cache *ic; |
1b690b487 [JFFS2] Invert la... |
596 597 |
if (unlinked) { |
1da177e4c Linux-2.6.12-rc2 |
598 |
/* The inode has zero nlink but its nodes weren't yet marked |
182ec4eee [JFFS2] Clean up ... |
599 |
obsolete. This has to be because we're still waiting for |
1da177e4c Linux-2.6.12-rc2 |
600 |
the final (close() and) iput() to happen. |
182ec4eee [JFFS2] Clean up ... |
601 |
There's a possibility that the final iput() could have |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 605 |
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 [JFFS2] Clean up ... |
606 |
The nlink can't _become_ zero at this point because we're |
1da177e4c Linux-2.6.12-rc2 |
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 |
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) { D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted. ", inum)); spin_lock(&c->inocache_lock); ic = jffs2_get_ino_cache(c, inum); if (!ic) { D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone. ", inum)); spin_unlock(&c->inocache_lock); return NULL; } if (ic->state != INO_STATE_CHECKEDABSENT) { /* Wait for progress. Don't just loop */ D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d ", 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. */ |
5451f79f5 iget: stop JFFS2 ... |
641 642 643 |
inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); if (IS_ERR(inode)) return ERR_CAST(inode); |
1da177e4c Linux-2.6.12-rc2 |
644 645 |
} if (is_bad_inode(inode)) { |
1b690b487 [JFFS2] Invert la... |
646 647 648 |
printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d ", inum, unlinked); |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 654 655 |
/* NB. This will happen again. We need to do something appropriate here. */ iput(inode); return ERR_PTR(-EIO); } return JFFS2_INODE_INFO(inode); } |
182ec4eee [JFFS2] Clean up ... |
656 657 |
unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
1da177e4c Linux-2.6.12-rc2 |
658 659 660 661 662 |
unsigned long offset, unsigned long *priv) { struct inode *inode = OFNI_EDONI_2SFFJ(f); struct page *pg; |
fc0e01974 [JFFS2] fix write... |
663 |
pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4c Linux-2.6.12-rc2 |
664 665 666 |
(void *)jffs2_do_readpage_unlock, inode); if (IS_ERR(pg)) return (void *)pg; |
182ec4eee [JFFS2] Clean up ... |
667 |
|
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 |
*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 [JFFS2] Clean up ... |
684 |
|
1da177e4c Linux-2.6.12-rc2 |
685 686 687 688 689 690 |
if (jffs2_cleanmarker_oob(c)) { /* NAND flash... do setup accordingly */ ret = jffs2_nand_flash_setup(c); if (ret) return ret; } |
8f15fd55f [JFFS2] Add suppo... |
691 692 693 694 695 696 |
/* and Dataflash */ if (jffs2_dataflash(c)) { ret = jffs2_dataflash_setup(c); if (ret) return ret; } |
59da721a2 [JFFS2] Teach JFF... |
697 698 699 700 701 702 703 |
/* and Intel "Sibley" flash */ if (jffs2_nor_wbuf_flash(c)) { ret = jffs2_nor_wbuf_flash_setup(c); if (ret) return ret; } |
0029da3bf JFFS2: add UBI su... |
704 705 706 707 708 709 |
/* and an UBI volume */ if (jffs2_ubivol(c)) { ret = jffs2_ubivol_setup(c); if (ret) return ret; } |
1da177e4c Linux-2.6.12-rc2 |
710 711 712 713 714 715 716 717 |
return ret; } void jffs2_flash_cleanup(struct jffs2_sb_info *c) { if (jffs2_cleanmarker_oob(c)) { jffs2_nand_flash_cleanup(c); } |
8f15fd55f [JFFS2] Add suppo... |
718 719 720 721 |
/* and DataFlash */ if (jffs2_dataflash(c)) { jffs2_dataflash_cleanup(c); } |
59da721a2 [JFFS2] Teach JFF... |
722 723 724 725 726 |
/* and Intel "Sibley" flash */ if (jffs2_nor_wbuf_flash(c)) { jffs2_nor_wbuf_flash_cleanup(c); } |
0029da3bf JFFS2: add UBI su... |
727 728 729 730 731 |
/* and an UBI volume */ if (jffs2_ubivol(c)) { jffs2_ubivol_cleanup(c); } |
1da177e4c Linux-2.6.12-rc2 |
732 |
} |