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fs/jffs2/dir.c
22.6 KB
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/* * JFFS2 -- Journalling Flash File System, Version 2. * |
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* Copyright © 2001-2007 Red Hat, Inc. |
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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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* * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> #include <linux/slab.h> |
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#include <linux/fs.h> #include <linux/crc32.h> #include <linux/jffs2.h> |
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#include "jffs2_fs_i.h" #include "jffs2_fs_sb.h" |
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#include <linux/time.h> #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 *); static int jffs2_unlink (struct inode *,struct dentry *); 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 *, unsigned int); |
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const struct file_operations jffs2_dir_operations = |
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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, .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, .lookup = jffs2_lookup, |
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.link = jffs2_link, .unlink = jffs2_unlink, .symlink = jffs2_symlink, .mkdir = jffs2_mkdir, .rmdir = jffs2_rmdir, .mknod = jffs2_mknod, .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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}; /***********************************************************************/ /* 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 */ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, |
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unsigned int flags) |
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{ struct jffs2_inode_info *dir_f; |
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struct jffs2_full_dirent *fd = NULL, *fd_list; uint32_t ino = 0; struct inode *inode = NULL; |
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unsigned int nhash; |
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jffs2_dbg(1, "jffs2_lookup() "); |
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if (target->d_name.len > JFFS2_MAX_NAME_LEN) 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 */ 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) { if (fd_list->nhash == nhash && |
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(!fd || fd_list->version > fd->version) && strlen(fd_list->name) == target->d_name.len && !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { fd = fd_list; } } if (fd) 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 ", ino); |
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} |
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return d_splice_alias(inode, target); |
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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); 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 ", inode->i_ino); |
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if (!dir_emit_dots(file, ctx)) 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 */ if (curofs < ctx->pos) { |
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jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld ", |
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fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
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continue; } if (!fd->ino) { |
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jffs2_dbg(2, "Skipping deletion dirent \"%s\" ", fd->name); |
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ctx->pos++; |
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continue; } |
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jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d ", |
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(unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 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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static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
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umode_t mode, bool excl) |
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{ struct jffs2_raw_inode *ri; struct jffs2_inode_info *f, *dir_f; struct jffs2_sb_info *c; struct inode *inode; int ret; ri = jffs2_alloc_raw_inode(); if (!ri) return -ENOMEM; |
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c = JFFS2_SB_INFO(dir_i->i_sb); |
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jffs2_dbg(1, "%s() ", __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 "); |
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jffs2_free_raw_inode(ri); return PTR_ERR(inode); } 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; f = JFFS2_INODE_INFO(inode); dir_f = JFFS2_INODE_INFO(dir_i); |
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/* jffs2_do_create() will want to lock it, _after_ reserving space and taking c-alloc_sem. If we keep it locked here, lockdep gets unhappy (although it's a false positive; nothing else will be looking at this inode yet so there's no chance of AB-BA deadlock involving its f->sem). */ 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) 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 ", __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 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); return ret; |
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} /***********************************************************************/ static int jffs2_unlink(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); |
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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; } /***********************************************************************/ static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) { |
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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); int ret; uint8_t type; |
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uint32_t now; |
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/* Don't let people make hard links to bad inodes. */ if (!f->inocache) return -EIO; |
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if (d_is_dir(old_dentry)) |
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return -EPERM; /* 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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} return ret; } /***********************************************************************/ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) { 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, targetlen = strlen(target); |
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/* FIXME: If you care. We'd need to use frags for the target 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(); if (!ri) 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. * Just the node will do for now, though |
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*/ namelen = dentry->d_name.len; |
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ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
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if (ret) { jffs2_free_raw_inode(ri); return ret; } |
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inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
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if (IS_ERR(inode)) { jffs2_free_raw_inode(ri); jffs2_complete_reservation(c); return PTR_ERR(inode); } inode->i_op = &jffs2_symlink_inode_operations; 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); ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 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); if (IS_ERR(fn)) { /* 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); 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 ", targetlen + 1); |
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mutex_unlock(&f->sem); |
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jffs2_complete_reservation(c); |
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ret = -ENOMEM; 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 ", __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 */ 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) goto fail; |
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ret = jffs2_init_acl_post(inode); |
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if (ret) goto fail; |
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ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
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if (ret) goto fail; |
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rd = jffs2_alloc_raw_dirent(); if (!rd) { /* Argh. Now we treat it like a normal delete */ jffs2_complete_reservation(c); |
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ret = -ENOMEM; goto fail; |
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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); 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); |
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rd->mctime = cpu_to_je32(JFFS2_NOW()); |
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rd->nsize = namelen; rd->type = DT_LNK; 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)); |
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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() */ jffs2_complete_reservation(c); jffs2_free_raw_dirent(rd); |
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mutex_unlock(&dir_f->sem); |
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ret = PTR_ERR(fd); goto fail; |
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} |
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|
410 |
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
1da177e4c
|
411 412 413 414 415 416 |
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); |
ced220703
|
417 |
mutex_unlock(&dir_f->sem); |
1da177e4c
|
418 |
jffs2_complete_reservation(c); |
1e2e547a9
|
419 |
d_instantiate_new(dentry, inode); |
1da177e4c
|
420 |
return 0; |
f324e4cb2
|
421 422 |
fail: |
41cce647f
|
423 |
iget_failed(inode); |
f324e4cb2
|
424 |
return ret; |
1da177e4c
|
425 |
} |
18bb1db3e
|
426 |
static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4c
|
427 428 429 430 431 432 433 434 435 |
{ 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; |
9fe4854cd
|
436 |
uint32_t alloclen; |
1da177e4c
|
437 438 439 440 441 442 443 |
int ret; mode |= S_IFDIR; ri = jffs2_alloc_raw_inode(); if (!ri) return -ENOMEM; |
182ec4eee
|
444 |
|
1da177e4c
|
445 |
c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4eee
|
446 447 |
/* Try to reserve enough space for both node and dirent. * Just the node will do for now, though |
1da177e4c
|
448 449 |
*/ namelen = dentry->d_name.len; |
9fe4854cd
|
450 451 |
ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4c
|
452 453 454 455 456 |
if (ret) { jffs2_free_raw_inode(ri); return ret; } |
cfc8dc6f6
|
457 |
inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4c
|
458 459 460 461 462 463 464 465 466 |
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; |
1da177e4c
|
467 468 |
f = JFFS2_INODE_INFO(inode); |
27c72b040
|
469 |
/* Directories get nlink 2 at start */ |
bfe868486
|
470 |
set_nlink(inode, 2); |
27c72b040
|
471 472 |
/* but ic->pino_nlink is the parent ino# */ f->inocache->pino_nlink = dir_i->i_ino; |
1da177e4c
|
473 474 |
ri->data_crc = cpu_to_je32(0); ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4eee
|
475 |
|
9fe4854cd
|
476 |
fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4c
|
477 478 479 480 481 |
jffs2_free_raw_inode(ri); if (IS_ERR(fn)) { /* Eeek. Wave bye bye */ |
ced220703
|
482 |
mutex_unlock(&f->sem); |
1da177e4c
|
483 |
jffs2_complete_reservation(c); |
f324e4cb2
|
484 485 |
ret = PTR_ERR(fn); goto fail; |
1da177e4c
|
486 |
} |
182ec4eee
|
487 |
/* No data here. Only a metadata node, which will be |
1da177e4c
|
488 489 490 |
obsoleted by the first data write */ f->metadata = fn; |
ced220703
|
491 |
mutex_unlock(&f->sem); |
1da177e4c
|
492 493 |
jffs2_complete_reservation(c); |
aa98d7cf5
|
494 |
|
2a7dba391
|
495 |
ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb2
|
496 497 |
if (ret) goto fail; |
cfc8dc6f6
|
498 |
ret = jffs2_init_acl_post(inode); |
f324e4cb2
|
499 500 |
if (ret) goto fail; |
aa98d7cf5
|
501 |
|
9fe4854cd
|
502 503 |
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
f324e4cb2
|
504 505 |
if (ret) goto fail; |
182ec4eee
|
506 |
|
1da177e4c
|
507 508 509 510 |
rd = jffs2_alloc_raw_dirent(); if (!rd) { /* Argh. Now we treat it like a normal delete */ jffs2_complete_reservation(c); |
f324e4cb2
|
511 512 |
ret = -ENOMEM; goto fail; |
1da177e4c
|
513 514 515 |
} dir_f = JFFS2_INODE_INFO(dir_i); |
ced220703
|
516 |
mutex_lock(&dir_f->sem); |
1da177e4c
|
517 518 519 520 521 522 523 524 525 |
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); |
c4592b9c3
|
526 |
rd->mctime = cpu_to_je32(JFFS2_NOW()); |
1da177e4c
|
527 528 529 530 |
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)); |
9fe4854cd
|
531 |
fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4eee
|
532 |
|
1da177e4c
|
533 |
if (IS_ERR(fd)) { |
182ec4eee
|
534 |
/* dirent failed to write. Delete the inode normally |
1da177e4c
|
535 536 537 |
as if it were the final unlink() */ jffs2_complete_reservation(c); jffs2_free_raw_dirent(rd); |
ced220703
|
538 |
mutex_unlock(&dir_f->sem); |
f324e4cb2
|
539 540 |
ret = PTR_ERR(fd); goto fail; |
1da177e4c
|
541 |
} |
c4592b9c3
|
542 |
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
d8c76e6f4
|
543 |
inc_nlink(dir_i); |
1da177e4c
|
544 545 546 547 548 549 |
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); |
ced220703
|
550 |
mutex_unlock(&dir_f->sem); |
1da177e4c
|
551 |
jffs2_complete_reservation(c); |
1e2e547a9
|
552 |
d_instantiate_new(dentry, inode); |
1da177e4c
|
553 |
return 0; |
f324e4cb2
|
554 555 |
fail: |
41cce647f
|
556 |
iget_failed(inode); |
f324e4cb2
|
557 |
return ret; |
1da177e4c
|
558 559 560 561 |
} static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) { |
27c72b040
|
562 563 |
struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
2b0143b5c
|
564 |
struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); |
1da177e4c
|
565 566 |
struct jffs2_full_dirent *fd; int ret; |
c4592b9c3
|
567 |
uint32_t now = JFFS2_NOW(); |
1da177e4c
|
568 569 570 571 572 |
for (fd = f->dents ; fd; fd = fd->next) { if (fd->ino) return -ENOTEMPTY; } |
27c72b040
|
573 574 575 576 |
ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, dentry->d_name.len, f, now); if (!ret) { |
c4592b9c3
|
577 |
dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
2b0143b5c
|
578 |
clear_nlink(d_inode(dentry)); |
9a53c3a78
|
579 |
drop_nlink(dir_i); |
27c72b040
|
580 |
} |
1da177e4c
|
581 582 |
return ret; } |
1a67aafb5
|
583 |
static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4c
|
584 585 586 587 588 589 590 591 592 |
{ 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; |
aef9ab478
|
593 |
union jffs2_device_node dev; |
1da177e4c
|
594 |
int devlen = 0; |
9fe4854cd
|
595 |
uint32_t alloclen; |
1da177e4c
|
596 |
int ret; |
1da177e4c
|
597 598 599 |
ri = jffs2_alloc_raw_inode(); if (!ri) return -ENOMEM; |
182ec4eee
|
600 |
|
1da177e4c
|
601 |
c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4eee
|
602 |
|
aef9ab478
|
603 604 |
if (S_ISBLK(mode) || S_ISCHR(mode)) devlen = jffs2_encode_dev(&dev, rdev); |
182ec4eee
|
605 606 607 |
/* Try to reserve enough space for both node and dirent. * Just the node will do for now, though |
1da177e4c
|
608 609 |
*/ namelen = dentry->d_name.len; |
9fe4854cd
|
610 |
ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab478
|
611 |
ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4c
|
612 613 614 615 616 |
if (ret) { jffs2_free_raw_inode(ri); return ret; } |
cfc8dc6f6
|
617 |
inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4c
|
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
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)); |
182ec4eee
|
636 |
|
9fe4854cd
|
637 |
fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4c
|
638 639 640 641 642 |
jffs2_free_raw_inode(ri); if (IS_ERR(fn)) { /* Eeek. Wave bye bye */ |
ced220703
|
643 |
mutex_unlock(&f->sem); |
1da177e4c
|
644 |
jffs2_complete_reservation(c); |
f324e4cb2
|
645 646 |
ret = PTR_ERR(fn); goto fail; |
1da177e4c
|
647 |
} |
182ec4eee
|
648 |
/* No data here. Only a metadata node, which will be |
1da177e4c
|
649 650 651 |
obsoleted by the first data write */ f->metadata = fn; |
ced220703
|
652 |
mutex_unlock(&f->sem); |
1da177e4c
|
653 654 |
jffs2_complete_reservation(c); |
aa98d7cf5
|
655 |
|
2a7dba391
|
656 |
ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb2
|
657 658 |
if (ret) goto fail; |
cfc8dc6f6
|
659 |
ret = jffs2_init_acl_post(inode); |
f324e4cb2
|
660 661 |
if (ret) goto fail; |
aa98d7cf5
|
662 |
|
9fe4854cd
|
663 664 |
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
f324e4cb2
|
665 666 |
if (ret) goto fail; |
1da177e4c
|
667 668 669 670 671 |
rd = jffs2_alloc_raw_dirent(); if (!rd) { /* Argh. Now we treat it like a normal delete */ jffs2_complete_reservation(c); |
f324e4cb2
|
672 673 |
ret = -ENOMEM; goto fail; |
1da177e4c
|
674 675 676 |
} dir_f = JFFS2_INODE_INFO(dir_i); |
ced220703
|
677 |
mutex_lock(&dir_f->sem); |
1da177e4c
|
678 679 680 681 682 683 684 685 686 |
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); |
c4592b9c3
|
687 |
rd->mctime = cpu_to_je32(JFFS2_NOW()); |
1da177e4c
|
688 689 690 691 692 693 694 |
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)); |
9fe4854cd
|
695 |
fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4eee
|
696 |
|
1da177e4c
|
697 |
if (IS_ERR(fd)) { |
182ec4eee
|
698 |
/* dirent failed to write. Delete the inode normally |
1da177e4c
|
699 700 701 |
as if it were the final unlink() */ jffs2_complete_reservation(c); jffs2_free_raw_dirent(rd); |
ced220703
|
702 |
mutex_unlock(&dir_f->sem); |
f324e4cb2
|
703 704 |
ret = PTR_ERR(fd); goto fail; |
1da177e4c
|
705 |
} |
c4592b9c3
|
706 |
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
1da177e4c
|
707 708 709 710 711 712 |
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); |
ced220703
|
713 |
mutex_unlock(&dir_f->sem); |
1da177e4c
|
714 |
jffs2_complete_reservation(c); |
1e2e547a9
|
715 |
d_instantiate_new(dentry, inode); |
1da177e4c
|
716 |
return 0; |
f324e4cb2
|
717 718 |
fail: |
41cce647f
|
719 |
iget_failed(inode); |
f324e4cb2
|
720 |
return ret; |
1da177e4c
|
721 722 723 |
} static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, |
f03b8ad8d
|
724 725 |
struct inode *new_dir_i, struct dentry *new_dentry, unsigned int flags) |
1da177e4c
|
726 727 728 729 730 |
{ 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; |
3a69e0cd2
|
731 |
uint32_t now; |
1da177e4c
|
732 |
|
f03b8ad8d
|
733 734 |
if (flags & ~RENAME_NOREPLACE) return -EINVAL; |
182ec4eee
|
735 |
/* The VFS will check for us and prevent trying to rename a |
1da177e4c
|
736 737 738 739 |
* 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. */ |
2b0143b5c
|
740 741 |
if (d_really_is_positive(new_dentry)) { victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); |
e36cb0b89
|
742 |
if (d_is_dir(new_dentry)) { |
1da177e4c
|
743 |
struct jffs2_full_dirent *fd; |
ced220703
|
744 |
mutex_lock(&victim_f->sem); |
1da177e4c
|
745 746 |
for (fd = victim_f->dents; fd; fd = fd->next) { if (fd->ino) { |
ced220703
|
747 |
mutex_unlock(&victim_f->sem); |
1da177e4c
|
748 749 750 |
return -ENOTEMPTY; } } |
ced220703
|
751 |
mutex_unlock(&victim_f->sem); |
1da177e4c
|
752 753 754 755 |
} } /* XXX: We probably ought to alloc enough space for |
182ec4eee
|
756 |
both nodes at the same time. Writing the new link, |
1da177e4c
|
757 758 759 760 |
then getting -ENOSPC, is quite bad :) */ /* Make a hard link */ |
182ec4eee
|
761 |
|
1da177e4c
|
762 |
/* XXX: This is ugly */ |
2b0143b5c
|
763 |
type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
1da177e4c
|
764 |
if (!type) type = DT_REG; |
c4592b9c3
|
765 |
now = JFFS2_NOW(); |
182ec4eee
|
766 |
ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
2b0143b5c
|
767 |
d_inode(old_dentry)->i_ino, type, |
3a69e0cd2
|
768 |
new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4c
|
769 770 771 772 773 774 |
if (ret) return ret; if (victim_f) { /* There was a victim. Kill it off nicely */ |
e36cb0b89
|
775 |
if (d_is_dir(new_dentry)) |
2b0143b5c
|
776 |
clear_nlink(d_inode(new_dentry)); |
22ba747f6
|
777 |
else |
2b0143b5c
|
778 |
drop_nlink(d_inode(new_dentry)); |
1da177e4c
|
779 780 781 |
/* Don't oops if the victim was a dirent pointing to an inode which didn't exist. */ if (victim_f->inocache) { |
ced220703
|
782 |
mutex_lock(&victim_f->sem); |
e36cb0b89
|
783 |
if (d_is_dir(new_dentry)) |
27c72b040
|
784 785 786 |
victim_f->inocache->pino_nlink = 0; else victim_f->inocache->pino_nlink--; |
ced220703
|
787 |
mutex_unlock(&victim_f->sem); |
1da177e4c
|
788 789 |
} } |
182ec4eee
|
790 |
/* If it was a directory we moved, and there was no victim, |
1da177e4c
|
791 |
increase i_nlink on its new parent */ |
e36cb0b89
|
792 |
if (d_is_dir(old_dentry) && !victim_f) |
d8c76e6f4
|
793 |
inc_nlink(new_dir_i); |
1da177e4c
|
794 795 |
/* Unlink the original */ |
182ec4eee
|
796 |
ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd2
|
797 |
old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4c
|
798 799 800 801 802 |
/* We don't touch inode->i_nlink */ if (ret) { /* Oh shit. We really ought to make a single node which can do both atomically */ |
2b0143b5c
|
803 |
struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
ced220703
|
804 |
mutex_lock(&f->sem); |
2b0143b5c
|
805 |
inc_nlink(d_inode(old_dentry)); |
e36cb0b89
|
806 |
if (f->inocache && !d_is_dir(old_dentry)) |
27c72b040
|
807 |
f->inocache->pino_nlink++; |
ced220703
|
808 |
mutex_unlock(&f->sem); |
1da177e4c
|
809 |
|
da320f055
|
810 811 812 |
pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link ", __func__, ret); |
f93812846
|
813 814 815 816 817 818 819 820 |
/* * 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); |
c4592b9c3
|
821 |
new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4c
|
822 823 |
return ret; } |
e36cb0b89
|
824 |
if (d_is_dir(old_dentry)) |
9a53c3a78
|
825 |
drop_nlink(old_dir_i); |
1da177e4c
|
826 |
|
c4592b9c3
|
827 |
new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
3a69e0cd2
|
828 |
|
1da177e4c
|
829 830 |
return 0; } |