Viewing file:  dir.c (24.92 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* 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 1.45 2001/12/27 22:43:20 dwmw2 Exp $
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/mtd/compatmac.h> /* For completion */
#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);
inode->i_size = ri->isize = 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) {
/* 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 = 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);
}
return ret;
}
|