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![Arnd Bergmann](/assets/img/avatar_default.png)
The VFS now uses timespec64 timestamps consistently, but jffs2 still converts them to 32-bit numbers on the storage medium. As the helper functions for the conversion (get_seconds() and timespec_to_timespec64()) are now deprecated, let's change them over to the more modern replacements. This keeps the traditional interpretation of those values, where the on-disk 32-bit numbers are taken to be negative numbers, i.e. dates before 1970, on 32-bit machines, but future numbers past 2038 on 64-bit machines. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
867 lines
23 KiB
C
867 lines
23 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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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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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/crc32.h>
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#include <linux/jffs2.h>
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#include "jffs2_fs_i.h"
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#include "jffs2_fs_sb.h"
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#include <linux/time.h>
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#include "nodelist.h"
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static int jffs2_readdir (struct file *, struct dir_context *);
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static int jffs2_create (struct inode *,struct dentry *,umode_t,
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bool);
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static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
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unsigned int);
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static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
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static int jffs2_unlink (struct inode *,struct dentry *);
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static int jffs2_symlink (struct inode *,struct dentry *,const char *);
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static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
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static int jffs2_rmdir (struct inode *,struct dentry *);
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static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
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static int jffs2_rename (struct inode *, struct dentry *,
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struct inode *, struct dentry *,
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unsigned int);
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const struct file_operations jffs2_dir_operations =
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{
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.read = generic_read_dir,
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.iterate_shared=jffs2_readdir,
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.unlocked_ioctl=jffs2_ioctl,
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.fsync = jffs2_fsync,
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.llseek = generic_file_llseek,
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};
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const struct inode_operations jffs2_dir_inode_operations =
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{
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.create = jffs2_create,
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.lookup = jffs2_lookup,
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.link = jffs2_link,
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.unlink = jffs2_unlink,
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.symlink = jffs2_symlink,
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.mkdir = jffs2_mkdir,
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.rmdir = jffs2_rmdir,
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.mknod = jffs2_mknod,
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.rename = jffs2_rename,
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.get_acl = jffs2_get_acl,
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.set_acl = jffs2_set_acl,
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.setattr = jffs2_setattr,
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.listxattr = jffs2_listxattr,
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};
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/***********************************************************************/
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/* We keep the dirent list sorted in increasing order of name hash,
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and we use the same hash function as the dentries. Makes this
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nice and simple
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*/
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static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
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unsigned int flags)
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{
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struct jffs2_inode_info *dir_f;
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struct jffs2_full_dirent *fd = NULL, *fd_list;
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uint32_t ino = 0;
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struct inode *inode = NULL;
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unsigned int nhash;
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jffs2_dbg(1, "jffs2_lookup()\n");
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if (target->d_name.len > JFFS2_MAX_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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dir_f = JFFS2_INODE_INFO(dir_i);
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/* The 'nhash' on the fd_list is not the same as the dentry hash */
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nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
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mutex_lock(&dir_f->sem);
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/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
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for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
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if (fd_list->nhash == nhash &&
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(!fd || fd_list->version > fd->version) &&
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strlen(fd_list->name) == target->d_name.len &&
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!strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
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fd = fd_list;
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}
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}
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if (fd)
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ino = fd->ino;
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mutex_unlock(&dir_f->sem);
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if (ino) {
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inode = jffs2_iget(dir_i->i_sb, ino);
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if (IS_ERR(inode))
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pr_warn("iget() failed for ino #%u\n", ino);
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}
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return d_splice_alias(inode, target);
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}
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/***********************************************************************/
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static int jffs2_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *inode = file_inode(file);
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struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
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struct jffs2_full_dirent *fd;
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unsigned long curofs = 1;
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jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
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if (!dir_emit_dots(file, ctx))
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return 0;
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mutex_lock(&f->sem);
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for (fd = f->dents; fd; fd = fd->next) {
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curofs++;
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/* First loop: curofs = 2; pos = 2 */
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if (curofs < ctx->pos) {
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jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
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fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
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continue;
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}
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if (!fd->ino) {
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jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
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fd->name);
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ctx->pos++;
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continue;
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}
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jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
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(unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
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if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
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break;
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ctx->pos++;
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}
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mutex_unlock(&f->sem);
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return 0;
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}
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/***********************************************************************/
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static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
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umode_t mode, bool excl)
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{
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struct jffs2_raw_inode *ri;
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struct jffs2_inode_info *f, *dir_f;
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struct jffs2_sb_info *c;
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struct inode *inode;
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int ret;
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ri = jffs2_alloc_raw_inode();
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if (!ri)
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return -ENOMEM;
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c = JFFS2_SB_INFO(dir_i->i_sb);
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jffs2_dbg(1, "%s()\n", __func__);
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inode = jffs2_new_inode(dir_i, mode, ri);
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if (IS_ERR(inode)) {
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jffs2_dbg(1, "jffs2_new_inode() failed\n");
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jffs2_free_raw_inode(ri);
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return PTR_ERR(inode);
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}
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inode->i_op = &jffs2_file_inode_operations;
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inode->i_fop = &jffs2_file_operations;
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inode->i_mapping->a_ops = &jffs2_file_address_operations;
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inode->i_mapping->nrpages = 0;
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f = JFFS2_INODE_INFO(inode);
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dir_f = JFFS2_INODE_INFO(dir_i);
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/* jffs2_do_create() will want to lock it, _after_ reserving
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space and taking c-alloc_sem. If we keep it locked here,
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lockdep gets unhappy (although it's a false positive;
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nothing else will be looking at this inode yet so there's
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no chance of AB-BA deadlock involving its f->sem). */
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mutex_unlock(&f->sem);
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ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
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if (ret)
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goto fail;
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dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
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jffs2_free_raw_inode(ri);
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jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
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__func__, inode->i_ino, inode->i_mode, inode->i_nlink,
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f->inocache->pino_nlink, inode->i_mapping->nrpages);
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d_instantiate_new(dentry, inode);
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return 0;
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fail:
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iget_failed(inode);
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jffs2_free_raw_inode(ri);
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return ret;
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}
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/***********************************************************************/
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static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
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{
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struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
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struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
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struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
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int ret;
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uint32_t now = JFFS2_NOW();
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ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
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dentry->d_name.len, dead_f, now);
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if (dead_f->inocache)
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set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
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if (!ret)
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dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
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return ret;
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}
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/***********************************************************************/
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static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
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{
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struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
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struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
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struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
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int ret;
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uint8_t type;
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uint32_t now;
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/* Don't let people make hard links to bad inodes. */
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if (!f->inocache)
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return -EIO;
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if (d_is_dir(old_dentry))
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return -EPERM;
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/* XXX: This is ugly */
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type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
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if (!type) type = DT_REG;
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now = JFFS2_NOW();
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ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
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if (!ret) {
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mutex_lock(&f->sem);
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set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
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mutex_unlock(&f->sem);
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d_instantiate(dentry, d_inode(old_dentry));
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dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
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ihold(d_inode(old_dentry));
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}
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return ret;
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}
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/***********************************************************************/
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static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
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{
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struct jffs2_inode_info *f, *dir_f;
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struct jffs2_sb_info *c;
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struct inode *inode;
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struct jffs2_raw_inode *ri;
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struct jffs2_raw_dirent *rd;
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struct jffs2_full_dnode *fn;
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struct jffs2_full_dirent *fd;
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int namelen;
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uint32_t alloclen;
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int ret, targetlen = strlen(target);
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/* FIXME: If you care. We'd need to use frags for the target
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if it grows much more than this */
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if (targetlen > 254)
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return -ENAMETOOLONG;
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ri = jffs2_alloc_raw_inode();
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if (!ri)
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return -ENOMEM;
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c = JFFS2_SB_INFO(dir_i->i_sb);
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/* Try to reserve enough space for both node and dirent.
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* Just the node will do for now, though
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*/
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namelen = dentry->d_name.len;
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ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
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ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
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if (ret) {
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jffs2_free_raw_inode(ri);
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return ret;
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}
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inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
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if (IS_ERR(inode)) {
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jffs2_free_raw_inode(ri);
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jffs2_complete_reservation(c);
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return PTR_ERR(inode);
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}
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inode->i_op = &jffs2_symlink_inode_operations;
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f = JFFS2_INODE_INFO(inode);
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inode->i_size = targetlen;
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ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
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ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
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ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
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ri->compr = JFFS2_COMPR_NONE;
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ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
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ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
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fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
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jffs2_free_raw_inode(ri);
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if (IS_ERR(fn)) {
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/* Eeek. Wave bye bye */
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mutex_unlock(&f->sem);
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jffs2_complete_reservation(c);
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ret = PTR_ERR(fn);
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goto fail;
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}
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/* We use f->target field to store the target path. */
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f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
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if (!f->target) {
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pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
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mutex_unlock(&f->sem);
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jffs2_complete_reservation(c);
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ret = -ENOMEM;
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goto fail;
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}
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inode->i_link = f->target;
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jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
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__func__, (char *)f->target);
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/* No data here. Only a metadata node, which will be
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obsoleted by the first data write
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*/
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f->metadata = fn;
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mutex_unlock(&f->sem);
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jffs2_complete_reservation(c);
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ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
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if (ret)
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goto fail;
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ret = jffs2_init_acl_post(inode);
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if (ret)
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goto fail;
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ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
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ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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if (ret)
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goto fail;
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rd = jffs2_alloc_raw_dirent();
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if (!rd) {
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/* Argh. Now we treat it like a normal delete */
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jffs2_complete_reservation(c);
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ret = -ENOMEM;
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goto fail;
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}
|
|
|
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dir_f = JFFS2_INODE_INFO(dir_i);
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mutex_lock(&dir_f->sem);
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|
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rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
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rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
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rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
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rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
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|
|
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rd->pino = cpu_to_je32(dir_i->i_ino);
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rd->version = cpu_to_je32(++dir_f->highest_version);
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rd->ino = cpu_to_je32(inode->i_ino);
|
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rd->mctime = cpu_to_je32(JFFS2_NOW());
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rd->nsize = namelen;
|
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rd->type = DT_LNK;
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rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
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rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
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|
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fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
|
|
|
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if (IS_ERR(fd)) {
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/* dirent failed to write. Delete the inode normally
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as if it were the final unlink() */
|
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jffs2_complete_reservation(c);
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jffs2_free_raw_dirent(rd);
|
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mutex_unlock(&dir_f->sem);
|
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ret = PTR_ERR(fd);
|
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goto fail;
|
|
}
|
|
|
|
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
|
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|
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jffs2_free_raw_dirent(rd);
|
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|
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/* Link the fd into the inode's list, obsoleting an old
|
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one if necessary. */
|
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jffs2_add_fd_to_list(c, fd, &dir_f->dents);
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|
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mutex_unlock(&dir_f->sem);
|
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jffs2_complete_reservation(c);
|
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|
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d_instantiate_new(dentry, inode);
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return 0;
|
|
|
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fail:
|
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iget_failed(inode);
|
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return ret;
|
|
}
|
|
|
|
|
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static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct jffs2_inode_info *f, *dir_f;
|
|
struct jffs2_sb_info *c;
|
|
struct inode *inode;
|
|
struct jffs2_raw_inode *ri;
|
|
struct jffs2_raw_dirent *rd;
|
|
struct jffs2_full_dnode *fn;
|
|
struct jffs2_full_dirent *fd;
|
|
int namelen;
|
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uint32_t alloclen;
|
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int ret;
|
|
|
|
mode |= S_IFDIR;
|
|
|
|
ri = jffs2_alloc_raw_inode();
|
|
if (!ri)
|
|
return -ENOMEM;
|
|
|
|
c = JFFS2_SB_INFO(dir_i->i_sb);
|
|
|
|
/* Try to reserve enough space for both node and dirent.
|
|
* Just the node will do for now, though
|
|
*/
|
|
namelen = dentry->d_name.len;
|
|
ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
|
|
JFFS2_SUMMARY_INODE_SIZE);
|
|
|
|
if (ret) {
|
|
jffs2_free_raw_inode(ri);
|
|
return ret;
|
|
}
|
|
|
|
inode = jffs2_new_inode(dir_i, mode, ri);
|
|
|
|
if (IS_ERR(inode)) {
|
|
jffs2_free_raw_inode(ri);
|
|
jffs2_complete_reservation(c);
|
|
return PTR_ERR(inode);
|
|
}
|
|
|
|
inode->i_op = &jffs2_dir_inode_operations;
|
|
inode->i_fop = &jffs2_dir_operations;
|
|
|
|
f = JFFS2_INODE_INFO(inode);
|
|
|
|
/* Directories get nlink 2 at start */
|
|
set_nlink(inode, 2);
|
|
/* but ic->pino_nlink is the parent ino# */
|
|
f->inocache->pino_nlink = dir_i->i_ino;
|
|
|
|
ri->data_crc = cpu_to_je32(0);
|
|
ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
|
|
|
|
fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
|
|
|
|
jffs2_free_raw_inode(ri);
|
|
|
|
if (IS_ERR(fn)) {
|
|
/* Eeek. Wave bye bye */
|
|
mutex_unlock(&f->sem);
|
|
jffs2_complete_reservation(c);
|
|
ret = PTR_ERR(fn);
|
|
goto fail;
|
|
}
|
|
/* No data here. Only a metadata node, which will be
|
|
obsoleted by the first data write
|
|
*/
|
|
f->metadata = fn;
|
|
mutex_unlock(&f->sem);
|
|
|
|
jffs2_complete_reservation(c);
|
|
|
|
ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = jffs2_init_acl_post(inode);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
|
|
if (ret)
|
|
goto fail;
|
|
|
|
rd = jffs2_alloc_raw_dirent();
|
|
if (!rd) {
|
|
/* Argh. Now we treat it like a normal delete */
|
|
jffs2_complete_reservation(c);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
dir_f = JFFS2_INODE_INFO(dir_i);
|
|
mutex_lock(&dir_f->sem);
|
|
|
|
rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
|
|
rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
|
|
rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
|
|
rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
|
|
|
|
rd->pino = cpu_to_je32(dir_i->i_ino);
|
|
rd->version = cpu_to_je32(++dir_f->highest_version);
|
|
rd->ino = cpu_to_je32(inode->i_ino);
|
|
rd->mctime = cpu_to_je32(JFFS2_NOW());
|
|
rd->nsize = namelen;
|
|
rd->type = DT_DIR;
|
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
|
|
rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
|
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
|
|
|
|
if (IS_ERR(fd)) {
|
|
/* dirent failed to write. Delete the inode normally
|
|
as if it were the final unlink() */
|
|
jffs2_complete_reservation(c);
|
|
jffs2_free_raw_dirent(rd);
|
|
mutex_unlock(&dir_f->sem);
|
|
ret = PTR_ERR(fd);
|
|
goto fail;
|
|
}
|
|
|
|
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
|
|
inc_nlink(dir_i);
|
|
|
|
jffs2_free_raw_dirent(rd);
|
|
|
|
/* Link the fd into the inode's list, obsoleting an old
|
|
one if necessary. */
|
|
jffs2_add_fd_to_list(c, fd, &dir_f->dents);
|
|
|
|
mutex_unlock(&dir_f->sem);
|
|
jffs2_complete_reservation(c);
|
|
|
|
d_instantiate_new(dentry, inode);
|
|
return 0;
|
|
|
|
fail:
|
|
iget_failed(inode);
|
|
return ret;
|
|
}
|
|
|
|
static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
|
|
{
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
|
|
struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
|
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
|
|
struct jffs2_full_dirent *fd;
|
|
int ret;
|
|
uint32_t now = JFFS2_NOW();
|
|
|
|
for (fd = f->dents ; fd; fd = fd->next) {
|
|
if (fd->ino)
|
|
return -ENOTEMPTY;
|
|
}
|
|
|
|
ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
|
|
dentry->d_name.len, f, now);
|
|
if (!ret) {
|
|
dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
|
|
clear_nlink(d_inode(dentry));
|
|
drop_nlink(dir_i);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct jffs2_inode_info *f, *dir_f;
|
|
struct jffs2_sb_info *c;
|
|
struct inode *inode;
|
|
struct jffs2_raw_inode *ri;
|
|
struct jffs2_raw_dirent *rd;
|
|
struct jffs2_full_dnode *fn;
|
|
struct jffs2_full_dirent *fd;
|
|
int namelen;
|
|
union jffs2_device_node dev;
|
|
int devlen = 0;
|
|
uint32_t alloclen;
|
|
int ret;
|
|
|
|
ri = jffs2_alloc_raw_inode();
|
|
if (!ri)
|
|
return -ENOMEM;
|
|
|
|
c = JFFS2_SB_INFO(dir_i->i_sb);
|
|
|
|
if (S_ISBLK(mode) || S_ISCHR(mode))
|
|
devlen = jffs2_encode_dev(&dev, rdev);
|
|
|
|
/* Try to reserve enough space for both node and dirent.
|
|
* Just the node will do for now, though
|
|
*/
|
|
namelen = dentry->d_name.len;
|
|
ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
|
|
|
|
if (ret) {
|
|
jffs2_free_raw_inode(ri);
|
|
return ret;
|
|
}
|
|
|
|
inode = jffs2_new_inode(dir_i, mode, ri);
|
|
|
|
if (IS_ERR(inode)) {
|
|
jffs2_free_raw_inode(ri);
|
|
jffs2_complete_reservation(c);
|
|
return PTR_ERR(inode);
|
|
}
|
|
inode->i_op = &jffs2_file_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
|
|
f = JFFS2_INODE_INFO(inode);
|
|
|
|
ri->dsize = ri->csize = cpu_to_je32(devlen);
|
|
ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
|
|
ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
|
|
|
|
ri->compr = JFFS2_COMPR_NONE;
|
|
ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
|
|
ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
|
|
|
|
fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
|
|
|
|
jffs2_free_raw_inode(ri);
|
|
|
|
if (IS_ERR(fn)) {
|
|
/* Eeek. Wave bye bye */
|
|
mutex_unlock(&f->sem);
|
|
jffs2_complete_reservation(c);
|
|
ret = PTR_ERR(fn);
|
|
goto fail;
|
|
}
|
|
/* No data here. Only a metadata node, which will be
|
|
obsoleted by the first data write
|
|
*/
|
|
f->metadata = fn;
|
|
mutex_unlock(&f->sem);
|
|
|
|
jffs2_complete_reservation(c);
|
|
|
|
ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = jffs2_init_acl_post(inode);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
|
|
if (ret)
|
|
goto fail;
|
|
|
|
rd = jffs2_alloc_raw_dirent();
|
|
if (!rd) {
|
|
/* Argh. Now we treat it like a normal delete */
|
|
jffs2_complete_reservation(c);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
dir_f = JFFS2_INODE_INFO(dir_i);
|
|
mutex_lock(&dir_f->sem);
|
|
|
|
rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
|
|
rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
|
|
rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
|
|
rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
|
|
|
|
rd->pino = cpu_to_je32(dir_i->i_ino);
|
|
rd->version = cpu_to_je32(++dir_f->highest_version);
|
|
rd->ino = cpu_to_je32(inode->i_ino);
|
|
rd->mctime = cpu_to_je32(JFFS2_NOW());
|
|
rd->nsize = namelen;
|
|
|
|
/* XXX: This is ugly. */
|
|
rd->type = (mode & S_IFMT) >> 12;
|
|
|
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
|
|
rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
|
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
|
|
|
|
if (IS_ERR(fd)) {
|
|
/* dirent failed to write. Delete the inode normally
|
|
as if it were the final unlink() */
|
|
jffs2_complete_reservation(c);
|
|
jffs2_free_raw_dirent(rd);
|
|
mutex_unlock(&dir_f->sem);
|
|
ret = PTR_ERR(fd);
|
|
goto fail;
|
|
}
|
|
|
|
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
|
|
|
|
jffs2_free_raw_dirent(rd);
|
|
|
|
/* Link the fd into the inode's list, obsoleting an old
|
|
one if necessary. */
|
|
jffs2_add_fd_to_list(c, fd, &dir_f->dents);
|
|
|
|
mutex_unlock(&dir_f->sem);
|
|
jffs2_complete_reservation(c);
|
|
|
|
d_instantiate_new(dentry, inode);
|
|
return 0;
|
|
|
|
fail:
|
|
iget_failed(inode);
|
|
return ret;
|
|
}
|
|
|
|
static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
|
|
struct inode *new_dir_i, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
int ret;
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
|
|
struct jffs2_inode_info *victim_f = NULL;
|
|
uint8_t type;
|
|
uint32_t now;
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
/* The VFS will check for us and prevent trying to rename a
|
|
* file over a directory and vice versa, but if it's a directory,
|
|
* the VFS can't check whether the victim is empty. The filesystem
|
|
* needs to do that for itself.
|
|
*/
|
|
if (d_really_is_positive(new_dentry)) {
|
|
victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
|
|
if (d_is_dir(new_dentry)) {
|
|
struct jffs2_full_dirent *fd;
|
|
|
|
mutex_lock(&victim_f->sem);
|
|
for (fd = victim_f->dents; fd; fd = fd->next) {
|
|
if (fd->ino) {
|
|
mutex_unlock(&victim_f->sem);
|
|
return -ENOTEMPTY;
|
|
}
|
|
}
|
|
mutex_unlock(&victim_f->sem);
|
|
}
|
|
}
|
|
|
|
/* XXX: We probably ought to alloc enough space for
|
|
both nodes at the same time. Writing the new link,
|
|
then getting -ENOSPC, is quite bad :)
|
|
*/
|
|
|
|
/* Make a hard link */
|
|
|
|
/* XXX: This is ugly */
|
|
type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
|
|
if (!type) type = DT_REG;
|
|
|
|
now = JFFS2_NOW();
|
|
ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
|
|
d_inode(old_dentry)->i_ino, type,
|
|
new_dentry->d_name.name, new_dentry->d_name.len, now);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (victim_f) {
|
|
/* There was a victim. Kill it off nicely */
|
|
if (d_is_dir(new_dentry))
|
|
clear_nlink(d_inode(new_dentry));
|
|
else
|
|
drop_nlink(d_inode(new_dentry));
|
|
/* Don't oops if the victim was a dirent pointing to an
|
|
inode which didn't exist. */
|
|
if (victim_f->inocache) {
|
|
mutex_lock(&victim_f->sem);
|
|
if (d_is_dir(new_dentry))
|
|
victim_f->inocache->pino_nlink = 0;
|
|
else
|
|
victim_f->inocache->pino_nlink--;
|
|
mutex_unlock(&victim_f->sem);
|
|
}
|
|
}
|
|
|
|
/* If it was a directory we moved, and there was no victim,
|
|
increase i_nlink on its new parent */
|
|
if (d_is_dir(old_dentry) && !victim_f)
|
|
inc_nlink(new_dir_i);
|
|
|
|
/* Unlink the original */
|
|
ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
|
|
old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
|
|
|
|
/* We don't touch inode->i_nlink */
|
|
|
|
if (ret) {
|
|
/* Oh shit. We really ought to make a single node which can do both atomically */
|
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
|
|
mutex_lock(&f->sem);
|
|
inc_nlink(d_inode(old_dentry));
|
|
if (f->inocache && !d_is_dir(old_dentry))
|
|
f->inocache->pino_nlink++;
|
|
mutex_unlock(&f->sem);
|
|
|
|
pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
|
|
__func__, ret);
|
|
/*
|
|
* We can't keep the target in dcache after that.
|
|
* For one thing, we can't afford dentry aliases for directories.
|
|
* For another, if there was a victim, we _can't_ set new inode
|
|
* for that sucker and we have to trigger mount eviction - the
|
|
* caller won't do it on its own since we are returning an error.
|
|
*/
|
|
d_invalidate(new_dentry);
|
|
new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
|
|
return ret;
|
|
}
|
|
|
|
if (d_is_dir(old_dentry))
|
|
drop_nlink(old_dir_i);
|
|
|
|
new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
|
|
|
|
return 0;
|
|
}
|
|
|