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878 lines
23 KiB
878 lines
23 KiB
/* |
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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 <[email protected]> |
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* |
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* Created by David Woodhouse <[email protected]> |
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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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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 user_namespace *, struct inode *, |
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struct dentry *, umode_t, 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 user_namespace *, struct inode *, |
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struct dentry *, const char *); |
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static int jffs2_mkdir (struct user_namespace *, struct inode *,struct dentry *, |
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umode_t); |
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static int jffs2_rmdir (struct inode *,struct dentry *); |
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static int jffs2_mknod (struct user_namespace *, struct inode *,struct dentry *, |
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umode_t,dev_t); |
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static int jffs2_rename (struct user_namespace *, struct inode *, |
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struct dentry *, 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 user_namespace *mnt_userns, struct inode *dir_i, |
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struct dentry *dentry, 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 user_namespace *mnt_userns, struct inode *dir_i, |
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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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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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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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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; |
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} |
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dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
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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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d_instantiate_new(dentry, inode); |
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return 0; |
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|
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fail: |
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iget_failed(inode); |
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return ret; |
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} |
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static int jffs2_mkdir (struct user_namespace *mnt_userns, struct inode *dir_i, |
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struct dentry *dentry, umode_t mode) |
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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; |
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mode |= S_IFDIR; |
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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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|
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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), &alloclen, ALLOC_NORMAL, |
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JFFS2_SUMMARY_INODE_SIZE); |
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|
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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, mode, 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_dir_inode_operations; |
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inode->i_fop = &jffs2_dir_operations; |
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f = JFFS2_INODE_INFO(inode); |
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|
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/* Directories get nlink 2 at start */ |
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set_nlink(inode, 2); |
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/* but ic->pino_nlink is the parent ino# */ |
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f->inocache->pino_nlink = dir_i->i_ino; |
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|
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ri->data_crc = cpu_to_je32(0); |
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ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
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|
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fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
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|
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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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/* 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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|
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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(); |
|
|
|
mutex_lock(&f->sem); |
|
for (fd = f->dents ; fd; fd = fd->next) { |
|
if (fd->ino) { |
|
mutex_unlock(&f->sem); |
|
return -ENOTEMPTY; |
|
} |
|
} |
|
mutex_unlock(&f->sem); |
|
|
|
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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, |
|
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; |
|
} |
|
|
|
|