/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/jffs2_fs_i.h>
#include <linux/jffs2_fs_sb.h>
#include <linux/time.h>
#include "nodelist.h"
static int jffs2_readdir (struct file *, void *, filldir_t);
static int jffs2_create (struct inode *,struct dentry *,int,
struct nameidata *);
static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
struct nameidata *);
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,dev_t);
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_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 nameidata *nd)
{
struct jffs2_inode_info *dir_f;
struct jffs2_sb_info *c;
struct jffs2_full_dirent *fd = NULL, *fd_list;
uint32_t 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) {
unsigned long pino = parent_ino(filp->f_dentry);
D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
if (filldir(dirent, "..", 2, 1, pino, 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)
break;
offset++;
}
up(&f->sem);
out:
filp->f_pos = offset;
return 0;
}
/***********************************************************************/
static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
struct nameidata *nd)
{
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;
c = JFFS2_SB_INFO(dir_i->i_sb);
D1(printk(KERN_DEBUG "jffs2_create()\n"));
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);
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);
ret = jffs2_do_create(c, dir_f, f, ri,
dentry->d_name.name, dentry->d_name.len);
if (ret) {
make_bad_inode(inode);
iput(inode);
jffs2_free_raw_inode(ri);
return ret;
}
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
jffs2_free_raw_inode(ri);
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_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);
struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
int ret;
uint32_t now = get_seconds();
ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
dentry->d_name.len, dead_f, now);
if (dead_f->inocache)
dentry->d_inode->i_nlink = dead_f->inocache->nlink;
if (!ret)
dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
return ret;
}
/***********************************************************************/
static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
int ret;
uint8_t type;
uint32_t now;
/* Don't let people make hard links to bad inodes. */
if (!f->inocache)
return -EIO;
if (S_ISDIR(old_dentry->d_inode->i_mode))
return -EPERM;
/* XXX: This is ugly */
type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
if (!type) type = DT_REG;
now = get_seconds();
ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
if (!ret) {
down(&f->sem);
old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
up(&f->sem);
d_instantiate(dentry, old_dentry->d_inode);
dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
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;
uint32_t alloclen, phys_ofs;
int ret, targetlen = strlen(target);
/* FIXME: If you care. We'd need to use frags for the target
if it grows much more than this */
if (targetlen > 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) + targetlen, &phys_ofs, &alloclen,
ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
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);
inode->i_size = targetlen;
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;
ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
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);
}
/* We use f->target field to store the target path. */
f->target = kmalloc(targetlen + 1, GFP_KERNEL);
if (!f->target) {
printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
up(&f->sem);
jffs2_complete_reservation(c);
jffs2_clear_inode(inode);
return -ENOMEM;
}
memcpy(f->target, target, targetlen + 1);
D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
/* No data here. Only a metadata node, which will be
obsoleted by the first data write
*/
f->metadata = fn;
up(&f->sem);
jffs2_complete_reservation(c);
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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 = 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(get_seconds());
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));
fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, 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);
up(&dir_f->sem);
jffs2_clear_inode(inode);
return PTR_ERR(fd);
}
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);
up(&dir_f->sem);
jffs2_complete_reservation(c);
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;
uint32_t alloclen, phys_ofs;
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,
JFFS2_SUMMARY_INODE_SIZE);
if (ret) {
jffs2_free_raw_inode(ri);
return ret;
}
inode = jffs2_new_inode(dir_i, mode, ri);
if (IS_ERR(inode)) {
jffs2_free_raw_inode(ri);
jffs2_complete_reservation(c);
return PTR_ERR(inode);
}
inode->i_op = &jffs2_dir_inode_operations;
inode->i_fop = &jffs2_dir_operations;
/* Directories get nlink 2 at start */
inode->i_nlink = 2;
f = JFFS2_INODE_INFO(inode);
ri->data_crc = cpu_to_je32(0);
ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
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);
jffs2_complete_reservation(c);
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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 = 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(get_seconds());
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, phys_ofs, 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);
up(&dir_f->sem);
jffs2_clear_inode(inode);
return PTR_ERR(fd);
}
dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
dir_i->i_nlink++;
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);
up(&dir_f->sem);
jffs2_complete_reservation(c);
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;
int ret;
for (fd = f->dents ; fd; fd = fd->next) {
if (fd->ino)
return -ENOTEMPTY;
}
ret = jffs2_unlink(dir_i, dentry);
if (!ret)
dir_i->i_nlink--;
return ret;
}
static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int 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;
jint16_t dev;
int devlen = 0;
uint32_t alloclen, phys_ofs;
int ret;
if (!old_valid_dev(rdev))
return -EINVAL;
ri = jffs2_alloc_raw_inode();
if (!ri)
return -ENOMEM;
c = JFFS2_SB_INFO(dir_i->i_sb);
if (S_ISBLK(mode) || S_ISCHR(mode)) {
dev = cpu_to_je16(old_encode_dev(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, 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, phys_ofs, ALLOC_NORMAL);
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);
jffs2_complete_reservation(c);
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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 = 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(get_seconds());
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, phys_ofs, 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);
up(&dir_f->sem);
jffs2_clear_inode(inode);
return PTR_ERR(fd);
}
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);
up(&dir_f->sem);
jffs2_complete_reservation(c);
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;
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;
/* 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 (new_dentry->d_inode) {
victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
if (S_ISDIR(new_dentry->d_inode->i_mode)) {
struct jffs2_full_dirent *fd;
down(&victim_f->sem);
for (fd = victim_f->dents; fd; fd = fd->next) {
if (fd->ino) {
up(&victim_f->sem);
return -ENOTEMPTY;
}
}
up(&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 = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
if (!type) type = DT_REG;
now = get_seconds();
ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
old_dentry->d_inode->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 */
new_dentry->d_inode->i_nlink--;
/* Don't oops if the victim was a dirent pointing to an
inode which didn't exist. */
if (victim_f->inocache) {
down(&victim_f->sem);
victim_f->inocache->nlink--;
up(&victim_f->sem);
}
}
/* If it was a directory we moved, and there was no victim,
increase i_nlink on its new parent */
if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
new_dir_i->i_nlink++;
/* 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(old_dentry->d_inode);
down(&f->sem);
old_dentry->d_inode->i_nlink++;
if (f->inocache)
f->inocache->nlink++;
up(&f->sem);
printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
/* Might as well let the VFS know */
d_instantiate(new_dentry, old_dentry->d_inode);
atomic_inc(&old_dentry->d_inode->i_count);
new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
return ret;
}
if (S_ISDIR(old_dentry->d_inode->i_mode))
old_dir_i->i_nlink--;
new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
return 0;
}
