patch-2.4.10 linux/fs/jffs2/dir.c
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- Lines: 952
- Date:
Fri Sep 14 14:04:07 2001
- Orig file:
v2.4.9/linux/fs/jffs2/dir.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/fs/jffs2/dir.c linux/fs/jffs2/dir.c
@@ -0,0 +1,951 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * The original JFFS, from which the design for JFFS2 was derived,
+ * was designed and implemented by Axis Communications AB.
+ *
+ * The contents of this file are subject to the Red Hat eCos Public
+ * License Version 1.1 (the "Licence"); you may not use this file
+ * except in compliance with the Licence. You may obtain a copy of
+ * the Licence at http://www.redhat.com/
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+ *
+ * The Original Code is JFFS2 - Journalling Flash File System, version 2
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the RHEPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
+ * $Id: dir.c,v 1.42 2001/05/24 22:24:39 dwmw2 Exp $
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/jffs2.h>
+#include <linux/jffs2_fs_i.h>
+#include <linux/jffs2_fs_sb.h>
+#include "nodelist.h"
+#include "crc32.h"
+
+static int jffs2_readdir (struct file *, void *, filldir_t);
+
+static int jffs2_create (struct inode *,struct dentry *,int);
+static struct dentry *jffs2_lookup (struct inode *,struct dentry *);
+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 *);
+static int jffs2_mkdir (struct inode *,struct dentry *,int);
+static int jffs2_rmdir (struct inode *,struct dentry *);
+static int jffs2_mknod (struct inode *,struct dentry *,int,int);
+static int jffs2_rename (struct inode *, struct dentry *,
+ struct inode *, struct dentry *);
+
+struct file_operations jffs2_dir_operations =
+{
+ read: generic_read_dir,
+ readdir: jffs2_readdir,
+ ioctl: jffs2_ioctl,
+ fsync: jffs2_null_fsync
+};
+
+
+struct inode_operations jffs2_dir_inode_operations =
+{
+ create: jffs2_create,
+ lookup: jffs2_lookup,
+ link: jffs2_link,
+ unlink: jffs2_unlink,
+ symlink: jffs2_symlink,
+ mkdir: jffs2_mkdir,
+ rmdir: jffs2_rmdir,
+ mknod: jffs2_mknod,
+ rename: jffs2_rename,
+ setattr: jffs2_setattr,
+};
+
+/***********************************************************************/
+
+
+/* We keep the dirent list sorted in increasing order of name hash,
+ and we use the same hash function as the dentries. Makes this
+ nice and simple
+*/
+static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target)
+{
+ struct jffs2_inode_info *dir_f;
+ struct jffs2_sb_info *c;
+ struct jffs2_full_dirent *fd = NULL, *fd_list;
+ __u32 ino = 0;
+ struct inode *inode = NULL;
+
+ D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ down(&dir_f->sem);
+
+ /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
+ for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
+ if (fd_list->nhash == target->d_name.hash &&
+ (!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;
+ up(&dir_f->sem);
+ if (ino) {
+ inode = iget(dir_i->i_sb, ino);
+ if (!inode) {
+ printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
+ return (ERR_PTR(-EIO));
+ }
+ }
+
+ d_add(target, inode);
+
+ return NULL;
+}
+
+/***********************************************************************/
+
+
+static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct jffs2_inode_info *f;
+ struct jffs2_sb_info *c;
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct jffs2_full_dirent *fd;
+ unsigned long offset, curofs;
+
+ D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
+
+ f = JFFS2_INODE_INFO(inode);
+ c = JFFS2_SB_INFO(inode->i_sb);
+
+ offset = filp->f_pos;
+
+ if (offset == 0) {
+ D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
+ if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
+ goto out;
+ offset++;
+ }
+ if (offset == 1) {
+ D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", filp->f_dentry->d_parent->d_inode->i_ino));
+ if (filldir(dirent, "..", 2, 1, filp->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
+ goto out;
+ offset++;
+ }
+
+ curofs=1;
+ down(&f->sem);
+ for (fd = f->dents; fd; fd = fd->next) {
+
+ curofs++;
+ /* First loop: curofs = 2; offset = 2 */
+ if (curofs < offset) {
+ D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
+ fd->name, fd->ino, fd->type, curofs, offset));
+ continue;
+ }
+ if (!fd->ino) {
+ D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
+ offset++;
+ continue;
+ }
+ D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
+ if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
+ goto out;
+ offset++;
+ }
+ out:
+ up(&f->sem);
+ filp->f_pos = offset;
+ return 0;
+}
+
+/***********************************************************************/
+
+static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int 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;
+ __u32 alloclen, phys_ofs;
+ __u32 writtenlen;
+ int ret;
+
+ ri = jffs2_alloc_raw_inode();
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ D1(printk(KERN_DEBUG "jffs2_create()\n"));
+
+ /* 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), &phys_ofs, &alloclen, ALLOC_NORMAL);
+ D1(printk(KERN_DEBUG "jffs2_create(): reserved 0x%x bytes\n", alloclen));
+ if (ret) {
+ jffs2_free_raw_inode(ri);
+ return ret;
+ }
+
+ inode = jffs2_new_inode(dir_i, mode, ri);
+
+ if (IS_ERR(inode)) {
+ D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
+ jffs2_free_raw_inode(ri);
+ jffs2_complete_reservation(c);
+ 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);
+
+ ri->data_crc = 0;
+ ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+
+ fn = jffs2_write_dnode(inode, ri, NULL, 0, phys_ofs, &writtenlen);
+ D1(printk(KERN_DEBUG "jffs2_create created file with mode 0x%x\n", ri->mode));
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n"));
+ /* Eeek. Wave bye bye */
+ up(&f->sem);
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fn);
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+
+ /* Work out where to put the dirent node now. */
+ writtenlen = PAD(writtenlen);
+ phys_ofs += writtenlen;
+ alloclen -= writtenlen;
+ up(&f->sem);
+
+ if (alloclen < sizeof(*rd)+namelen) {
+ /* Not enough space left in this chunk. Get some more */
+ jffs2_complete_reservation(c);
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+
+ if (ret) {
+ /* Eep. */
+ D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n"));
+ jffs2_clear_inode(inode);
+ return ret;
+ }
+ }
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return -ENOMEM;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + namelen;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = inode->i_ino;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = namelen;
+ rd->type = DT_REG;
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ up(&dir_f->sem);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fd);
+ }
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ d_instantiate(dentry, inode);
+
+ D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
+ inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
+ return 0;
+}
+
+/***********************************************************************/
+
+static int jffs2_do_unlink(struct inode *dir_i, struct dentry *dentry, int rename)
+{
+ struct jffs2_inode_info *dir_f, *f;
+ struct jffs2_sb_info *c;
+ struct jffs2_raw_dirent *rd;
+ struct jffs2_full_dirent *fd;
+ __u32 alloclen, phys_ofs;
+ int ret;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd)
+ return -ENOMEM;
+
+ ret = jffs2_reserve_space(c, sizeof(*rd)+dentry->d_name.len, &phys_ofs, &alloclen, ALLOC_DELETION);
+ if (ret) {
+ jffs2_free_raw_dirent(rd);
+ return ret;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ /* Build a deletion node */
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + dentry->d_name.len;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = 0;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = dentry->d_name.len;
+ rd->type = DT_UNKNOWN;
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, dentry->d_name.len);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, dentry->d_name.len, phys_ofs, NULL);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ up(&dir_f->sem);
+ return PTR_ERR(fd);
+ }
+
+ /* File it. This will mark the old one obsolete. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ if (!rename) {
+ f = JFFS2_INODE_INFO(dentry->d_inode);
+ down(&f->sem);
+
+ while (f->dents) {
+ /* There can be only deleted ones */
+ fd = f->dents;
+
+ f->dents = fd->next;
+
+ if (fd->ino) {
+ printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
+ f->inocache->ino, fd->name, fd->ino);
+ } else {
+ D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", fd->name, f->inocache->ino));
+ }
+ jffs2_mark_node_obsolete(c, fd->raw);
+ jffs2_free_full_dirent(fd);
+ }
+
+ f->inocache->nlink--;
+ dentry->d_inode->i_nlink--;
+ up(&f->sem);
+ }
+
+ return 0;
+}
+
+static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
+{
+ return jffs2_do_unlink(dir_i, dentry, 0);
+}
+/***********************************************************************/
+
+static int jffs2_do_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry, int rename)
+{
+ struct jffs2_inode_info *dir_f, *f;
+ struct jffs2_sb_info *c;
+ struct jffs2_raw_dirent *rd;
+ struct jffs2_full_dirent *fd;
+ __u32 alloclen, phys_ofs;
+ int ret;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd)
+ return -ENOMEM;
+
+ ret = jffs2_reserve_space(c, sizeof(*rd)+dentry->d_name.len, &phys_ofs, &alloclen, ALLOC_NORMAL);
+ if (ret) {
+ jffs2_free_raw_dirent(rd);
+ return ret;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ /* Build a deletion node */
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + dentry->d_name.len;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = old_dentry->d_inode->i_ino;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = dentry->d_name.len;
+
+ /* XXX: This is ugly. */
+ rd->type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
+ if (!rd->type) rd->type = DT_REG;
+
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, dentry->d_name.len);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, dentry->d_name.len, phys_ofs, NULL);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ up(&dir_f->sem);
+ return PTR_ERR(fd);
+ }
+
+ /* File it. This will mark the old one obsolete. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ if (!rename) {
+ f = JFFS2_INODE_INFO(old_dentry->d_inode);
+ down(&f->sem);
+ old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
+ up(&f->sem);
+ }
+ return 0;
+}
+
+static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
+{
+ int ret = jffs2_do_link(old_dentry, dir_i, dentry, 0);
+ if (!ret) {
+ d_instantiate(dentry, old_dentry->d_inode);
+ atomic_inc(&old_dentry->d_inode->i_count);
+ }
+ 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;
+ __u32 alloclen, phys_ofs;
+ __u32 writtenlen;
+ int ret;
+
+ /* FIXME: If you care. We'd need to use frags for the target
+ if it grows much more than this */
+ if (strlen(target) > 254)
+ return -EINVAL;
+
+ 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) + strlen(target), &phys_ofs, &alloclen, ALLOC_NORMAL);
+
+ if (ret) {
+ jffs2_free_raw_inode(ri);
+ return ret;
+ }
+
+ inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
+
+ 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);
+
+ ri->dsize = ri->csize = strlen(target);
+ ri->totlen = sizeof(*ri) + ri->dsize;
+ ri->hdr_crc = crc32(0, ri, sizeof(struct jffs2_unknown_node)-4);
+
+ ri->compr = JFFS2_COMPR_NONE;
+ ri->data_crc = crc32(0, target, strlen(target));
+ ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+
+ fn = jffs2_write_dnode(inode, ri, target, strlen(target), phys_ofs, &writtenlen);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ up(&f->sem);
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fn);
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ up(&f->sem);
+
+ /* Work out where to put the dirent node now. */
+ writtenlen = (writtenlen+3)&~3;
+ phys_ofs += writtenlen;
+ alloclen -= writtenlen;
+
+ if (alloclen < sizeof(*rd)+namelen) {
+ /* Not enough space left in this chunk. Get some more */
+ jffs2_complete_reservation(c);
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+ if (ret) {
+ /* Eep. */
+ jffs2_clear_inode(inode);
+ return ret;
+ }
+ }
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return -ENOMEM;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + namelen;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = inode->i_ino;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = namelen;
+ rd->type = DT_LNK;
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ up(&dir_f->sem);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fd);
+ }
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ d_instantiate(dentry, inode);
+ return 0;
+}
+
+
+static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int 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;
+ __u32 alloclen, phys_ofs;
+ __u32 writtenlen;
+ 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), &phys_ofs, &alloclen, ALLOC_NORMAL);
+
+ 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);
+
+ ri->data_crc = 0;
+ ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+
+ fn = jffs2_write_dnode(inode, ri, NULL, 0, phys_ofs, &writtenlen);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ up(&f->sem);
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fn);
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ up(&f->sem);
+
+ /* Work out where to put the dirent node now. */
+ writtenlen = PAD(writtenlen);
+ phys_ofs += writtenlen;
+ alloclen -= writtenlen;
+
+ if (alloclen < sizeof(*rd)+namelen) {
+ /* Not enough space left in this chunk. Get some more */
+ jffs2_complete_reservation(c);
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+ if (ret) {
+ /* Eep. */
+ jffs2_clear_inode(inode);
+ return ret;
+ }
+ }
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return -ENOMEM;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + namelen;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = inode->i_ino;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = namelen;
+ rd->type = DT_DIR;
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ up(&dir_f->sem);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fd);
+ }
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ d_instantiate(dentry, inode);
+ return 0;
+}
+
+static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
+{
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
+ struct jffs2_full_dirent *fd;
+
+ for (fd = f->dents ; fd; fd = fd->next) {
+ if (fd->ino)
+ return -ENOTEMPTY;
+ }
+ return jffs2_unlink(dir_i, dentry);
+}
+
+static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, int 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;
+ unsigned short dev;
+ int devlen = 0;
+ __u32 alloclen, phys_ofs;
+ __u32 writtenlen;
+ int ret;
+
+ ri = jffs2_alloc_raw_inode();
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ if ((mode & S_IFMT) == S_IFBLK ||
+ (mode & S_IFMT) == S_IFCHR) {
+ dev = (MAJOR(to_kdev_t(rdev)) << 8) | MINOR(to_kdev_t(rdev));
+ devlen = sizeof(dev);
+ }
+
+ /* 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, &phys_ofs, &alloclen, ALLOC_NORMAL);
+
+ 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 = devlen;
+ ri->totlen = sizeof(*ri) + ri->csize;
+ ri->hdr_crc = crc32(0, ri, sizeof(struct jffs2_unknown_node)-4);
+
+ ri->compr = JFFS2_COMPR_NONE;
+ ri->data_crc = crc32(0, &dev, devlen);
+ ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+
+ fn = jffs2_write_dnode(inode, ri, (char *)&dev, devlen, phys_ofs, &writtenlen);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ up(&f->sem);
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fn);
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ up(&f->sem);
+
+ /* Work out where to put the dirent node now. */
+ writtenlen = (writtenlen+3)&~3;
+ phys_ofs += writtenlen;
+ alloclen -= writtenlen;
+
+ if (alloclen < sizeof(*rd)+namelen) {
+ /* Not enough space left in this chunk. Get some more */
+ jffs2_complete_reservation(c);
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+ if (ret) {
+ /* Eep. */
+ jffs2_clear_inode(inode);
+ return ret;
+ }
+ }
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ jffs2_clear_inode(inode);
+ return -ENOMEM;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ down(&dir_f->sem);
+
+ rd->magic = JFFS2_MAGIC_BITMASK;
+ rd->nodetype = JFFS2_NODETYPE_DIRENT;
+ rd->totlen = sizeof(*rd) + namelen;
+ rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+ rd->pino = dir_i->i_ino;
+ rd->version = dir_f->highest_version++;
+ rd->ino = inode->i_ino;
+ rd->mctime = CURRENT_TIME;
+ rd->nsize = namelen;
+
+ /* XXX: This is ugly. */
+ rd->type = (mode & S_IFMT) >> 12;
+
+ rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+ rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+ fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ up(&dir_f->sem);
+ jffs2_clear_inode(inode);
+ return PTR_ERR(fd);
+ }
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+ up(&dir_f->sem);
+
+ d_instantiate(dentry, inode);
+ return 0;
+}
+
+static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
+ struct inode *new_dir_i, struct dentry *new_dentry)
+{
+ int ret;
+ /* 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 */
+ ret = jffs2_do_link(old_dentry, new_dir_i, new_dentry, 1);
+ if (ret)
+ return ret;
+
+ /* Unlink the original */
+ ret = jffs2_do_unlink(old_dir_i, old_dentry, 1);
+
+ if (ret) {
+ /* Try to delete the _new_ link to return a clean failure */
+ int ret2 = jffs2_do_unlink(new_dir_i, new_dentry, 1);
+ if (ret2) {
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
+ down(&f->sem);
+ old_dentry->d_inode->i_nlink = f->inocache->nlink++;
+ up(&f->sem);
+
+ printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (old err %d, new err %d). You now have a hard link\n", ret, ret2);
+ /* Might as well let the VFS know */
+ d_instantiate(new_dentry, old_dentry->d_inode);
+ atomic_inc(&old_dentry->d_inode->i_count);
+ }
+
+ }
+ return ret;
+}
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)