static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
{
int retval;
struct inode * inode;
struct buffer_head * bh;
struct sysv_dir_entry * de;
inode = dentry->d_inode;
bh = sysv_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
retval = -ENOENT;
if (!bh || de->inode != inode->i_ino)
goto end_rmdir;
if (!empty_dir(inode)) {
retval = -ENOTEMPTY;
goto end_rmdir;
}
if (inode->i_nlink != 2)
printk("empty directory has nlink!=2 (%d)\n", inode->i_nlink);
de->inode = 0;
mark_buffer_dirty(bh);
inode->i_nlink=0;
dir->i_nlink--;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(inode);
mark_inode_dirty(dir);
retval = 0;
end_rmdir:
brelse(bh);
return retval;
}
static int sysv_unlink(struct inode * dir, struct dentry * dentry)
{
int retval;
struct inode * inode;
struct buffer_head * bh;
struct sysv_dir_entry * de;
retval = -ENOENT;
inode = dentry->d_inode;
bh = sysv_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
if (!bh || de->inode != inode->i_ino)
goto end_unlink;
if (!inode->i_nlink) {
printk("Deleting nonexistent file (%s:%lu), %d\n",
kdevname(inode->i_dev), inode->i_ino, inode->i_nlink);
inode->i_nlink=1;
}
de->inode = 0;
mark_buffer_dirty(bh);
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(dir);
inode->i_nlink--;
inode->i_ctime = dir->i_ctime;
mark_inode_dirty(inode);
retval = 0;
end_unlink:
brelse(bh);
return retval;
}
int sysv_link(struct dentry * old_dentry, struct inode * dir,
struct dentry * dentry)
{
struct inode *oldinode = old_dentry->d_inode;
int error;
struct sysv_dir_entry * de;
struct buffer_head * bh;
if (S_ISDIR(oldinode->i_mode)) {
return -EPERM;
}
if (oldinode->i_nlink >= oldinode->i_sb->sv_link_max) {
return -EMLINK;
}
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
error = sysv_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (error) {
brelse(bh);
return error;
}
de->inode = oldinode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
oldinode->i_nlink++;
oldinode->i_ctime = CURRENT_TIME;
mark_inode_dirty(oldinode);
d_instantiate(dentry, oldinode);
return 0;
}
static int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev)
{
int error;
struct inode * inode;
struct buffer_head * bh;
struct sysv_dir_entry * de;
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
inode = sysv_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_uid = current->fsuid;
init_special_inode(inode, mode, rdev);
mark_inode_dirty(inode);
error = sysv_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (error) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh);
brelse(bh);
d_instantiate(dentry, inode);
return 0;
}
int sysv_symlink(struct inode * dir, struct dentry * dentry,
const char * symname)
{
struct sysv_dir_entry * de;
struct inode * inode;
struct buffer_head * name_block;
char * name_block_data;
struct super_block * sb;
int i;
char c;
struct buffer_head * bh;
if (!(inode = sysv_new_inode(dir)))
return -ENOSPC;
inode->i_mode = S_IFLNK | 0777;
inode->i_op = &sysv_symlink_inode_operations;
name_block = sysv_file_bread(inode, 0, 1);
if (!name_block) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return -ENOSPC;
}
sb = inode->i_sb;
name_block_data = name_block->b_data;
i = 0;
while (i < sb->sv_block_size_1 && (c = *(symname++)))
name_block_data[i++] = c;
name_block_data[i] = 0;
mark_buffer_dirty(name_block, 1);
brelse(name_block);
inode->i_size = i;
mark_inode_dirty(inode);
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
brelse(bh);
return -EEXIST;
}
i = sysv_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (i) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return i;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
d_instantiate(dentry, inode);
return 0;
}
int sysv_mkdir(struct inode * dir, struct dentry *dentry, int mode)
{
int error;
struct inode * inode;
struct buffer_head * bh, *dir_block;
struct sysv_dir_entry * de;
if (!dir)
return -EINVAL;
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
if (dir->i_nlink >= dir->i_sb->sv_link_max)
return -EMLINK;
inode = sysv_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_op = &sysv_dir_inode_operations;
inode->i_size = 2 * SYSV_DIRSIZE;
dir_block = sysv_file_bread(inode,0,1);
if (!dir_block) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return -ENOSPC;
}
de = (struct sysv_dir_entry *) (dir_block->b_data + 0*SYSV_DIRSIZE);
de->inode = inode->i_ino;
strcpy(de->name,"."); /* rest of de->name is zero, see sysv_new_block */
de = (struct sysv_dir_entry *) (dir_block->b_data + 1*SYSV_DIRSIZE);
de->inode = dir->i_ino;
strcpy(de->name,".."); /* rest of de->name is zero, see sysv_new_block */
inode->i_nlink = 2;
mark_buffer_dirty(dir_block, 1);
brelse(dir_block);
inode->i_mode = S_IFDIR | (mode & 0777 & ~current->fs->umask);
if (dir->i_mode & S_ISGID)
inode->i_mode |= S_ISGID;
mark_inode_dirty(inode);
error = sysv_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (error) {
inode->i_nlink=0;
iput(inode);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
dir->i_nlink++;
mark_inode_dirty(dir);
brelse(bh);
d_instantiate(dentry, inode);
return 0;
}
ino_t sysv_inode_by_name(struct dentry *dentry)
{
struct page *page;
struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
ino_t res = 0;
if (de) {
res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
dir_put_page(page);
}
return res;
}
int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev)
{
int error;
struct inode * inode;
struct buffer_head * bh;
struct sysv_dir_entry * de;
if (!dir)
return -ENOENT;
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
inode = sysv_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_uid = current->fsuid;
inode->i_mode = mode;
inode->i_op = NULL;
if (S_ISREG(inode->i_mode))
inode->i_op = &sysv_file_inode_operations;
else if (S_ISCHR(inode->i_mode))
inode->i_op = &chrdev_inode_operations;
else if (S_ISBLK(inode->i_mode))
inode->i_op = &blkdev_inode_operations;
else if (S_ISFIFO(inode->i_mode))
init_fifo(inode);
if (S_ISBLK(mode) || S_ISCHR(mode))
inode->i_rdev = to_kdev_t(rdev);
mark_inode_dirty(inode);
error = sysv_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (error) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
d_instantiate(dentry, inode);
return 0;
}
int sysv_unlink(struct inode * dir, struct dentry * dentry)
{
int retval;
struct inode * inode;
struct buffer_head * bh;
struct sysv_dir_entry * de;
repeat:
retval = -ENOENT;
inode = NULL;
bh = sysv_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (!bh)
goto end_unlink;
inode = dentry->d_inode;
retval = -EPERM;
if (de->inode != inode->i_ino) {
brelse(bh);
current->counter = 0;
schedule();
goto repeat;
}
if (de->inode != inode->i_ino) {
retval = -ENOENT;
goto end_unlink;
}
if (!inode->i_nlink) {
printk("Deleting nonexistent file (%s:%lu), %d\n",
kdevname(inode->i_dev), inode->i_ino, inode->i_nlink);
inode->i_nlink=1;
}
de->inode = 0;
mark_buffer_dirty(bh, 1);
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(dir);
inode->i_nlink--;
inode->i_ctime = dir->i_ctime;
mark_inode_dirty(inode);
d_delete(dentry);
retval = 0;
end_unlink:
brelse(bh);
return retval;
}
static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry)
{
struct inode * inode = NULL;
struct sysv_dir_entry * de;
struct buffer_head * bh;
bh = sysv_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
if (bh) {
int ino = de->inode;
brelse(bh);
inode = iget(dir->i_sb, ino);
if (!inode)
return ERR_PTR(-EACCES);
}
d_add(dentry, inode);
return NULL;
}
static int sysv_unlink(struct inode * dir, struct dentry * dentry)
{
struct inode * inode = dentry->d_inode;
struct page * page;
struct sysv_dir_entry * de;
int err = -ENOENT;
de = sysv_find_entry(dentry, &page);
if (!de)
goto out;
err = sysv_delete_entry (de, page);
if (err)
goto out;
inode->i_ctime = dir->i_ctime;
inode_dec_link_count(inode);
out:
return err;
}
int sysv_lookup(struct inode * dir, struct dentry * dentry)
{
struct inode * inode = NULL;
struct sysv_dir_entry * de;
struct buffer_head * bh;
if (!dir)
return -ENOENT;
if (!S_ISDIR(dir->i_mode)) {
return -ENOENT;
}
bh = sysv_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
if (bh) {
int ino = de->inode;
brelse(bh);
inode = iget(dir->i_sb, ino);
if (!inode)
return -EACCES;
}
d_add(dentry, inode);
return 0;
}
static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
struct inode * new_dir, struct dentry * new_dentry)
{
struct inode * old_inode = old_dentry->d_inode;
struct inode * new_inode = new_dentry->d_inode;
struct page * dir_page = NULL;
struct sysv_dir_entry * dir_de = NULL;
struct page * old_page;
struct sysv_dir_entry * old_de;
int err = -ENOENT;
old_de = sysv_find_entry(old_dentry, &old_page);
if (!old_de)
goto out;
if (S_ISDIR(old_inode->i_mode)) {
err = -EIO;
dir_de = sysv_dotdot(old_inode, &dir_page);
if (!dir_de)
goto out_old;
}
if (new_inode) {
struct page * new_page;
struct sysv_dir_entry * new_de;
err = -ENOTEMPTY;
if (dir_de && !sysv_empty_dir(new_inode))
goto out_dir;
err = -ENOENT;
new_de = sysv_find_entry(new_dentry, &new_page);
if (!new_de)
goto out_dir;
inode_inc_link_count(old_inode);
sysv_set_link(new_de, new_page, old_inode);
new_inode->i_ctime = CURRENT_TIME_SEC;
if (dir_de)
drop_nlink(new_inode);
inode_dec_link_count(new_inode);
} else {
if (dir_de) {
err = -EMLINK;
if (new_dir->i_nlink >= SYSV_SB(new_dir->i_sb)->s_link_max)
goto out_dir;
}
inode_inc_link_count(old_inode);
err = sysv_add_link(new_dentry, old_inode);
if (err) {
inode_dec_link_count(old_inode);
goto out_dir;
}
if (dir_de)
inode_inc_link_count(new_dir);
}
sysv_delete_entry(old_de, old_page);
inode_dec_link_count(old_inode);
if (dir_de) {
sysv_set_link(dir_de, dir_page, new_dir);
inode_dec_link_count(old_dir);
}
return 0;
out_dir:
if (dir_de) {
kunmap(dir_page);
page_cache_release(dir_page);
}
out_old:
kunmap(old_page);
page_cache_release(old_page);
out:
return err;
}
/*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
struct inode * new_dir, struct dentry * new_dentry)
{
struct inode * old_inode, * new_inode;
struct buffer_head * old_bh, * new_bh, * dir_bh;
struct sysv_dir_entry * old_de, * new_de;
int retval;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
new_bh = dir_bh = NULL;
old_bh = sysv_find_entry(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len, &old_de);
retval = -ENOENT;
if (!old_bh || old_de->inode != old_inode->i_ino)
goto end_rename;
retval = -EPERM;
new_bh = sysv_find_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_de);
if (new_bh) {
if (!new_inode) {
brelse(new_bh);
new_bh = NULL;
}
}
if (S_ISDIR(old_inode->i_mode)) {
if (new_inode) {
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto end_rename;
}
retval = -EIO;
dir_bh = sysv_file_bread(old_inode, 0, 0);
if (!dir_bh)
goto end_rename;
if (PARENT_INO(dir_bh->b_data) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir != old_dir &&
new_dir->i_nlink >= new_dir->i_sb->sv_link_max)
goto end_rename;
}
if (!new_bh) {
retval = sysv_add_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_bh, &new_de);
if (retval)
goto end_rename;
}
new_de->inode = old_inode->i_ino;
old_de->inode = 0;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(new_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
mark_buffer_dirty(old_bh);
mark_buffer_dirty(new_bh);
if (dir_bh) {
PARENT_INO(dir_bh->b_data) = new_dir->i_ino;
mark_buffer_dirty(dir_bh);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
retval = 0;
end_rename:
brelse(dir_bh);
brelse(old_bh);
brelse(new_bh);
return retval;
}
/*
* rename uses retrying to avoid race-conditions: at least they should be minimal.
* it tries to allocate all the blocks, then sanity-checks, and if the sanity-
* checks fail, it tries to restart itself again. Very practical - no changes
* are done until we know everything works ok.. and then all the changes can be
* done in one fell swoop when we have claimed all the buffers needed.
*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
static int do_sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
struct inode * new_dir, struct dentry * new_dentry)
{
struct inode * old_inode, * new_inode;
struct buffer_head * old_bh, * new_bh, * dir_bh;
struct sysv_dir_entry * old_de, * new_de;
int retval;
goto start_up;
try_again:
brelse(old_bh);
brelse(new_bh);
brelse(dir_bh);
current->counter = 0;
schedule();
start_up:
old_inode = new_inode = NULL;
old_bh = new_bh = dir_bh = NULL;
old_bh = sysv_find_entry(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len, &old_de);
retval = -ENOENT;
if (!old_bh)
goto end_rename;
old_inode = old_dentry->d_inode; /* don't cross mnt-points */
retval = -EPERM;
new_inode = new_dentry->d_inode;
new_bh = sysv_find_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_de);
if (new_bh) {
if (!new_inode) {
brelse(new_bh);
new_bh = NULL;
}
}
if (new_inode == old_inode) {
retval = 0;
goto end_rename;
}
if (S_ISDIR(old_inode->i_mode)) {
retval = -EINVAL;
if (is_subdir(new_dentry, old_dentry))
goto end_rename;
if (new_inode) {
if (new_dentry->d_count > 1)
shrink_dcache_parent(new_dentry);
retval = -EBUSY;
if (new_dentry->d_count > 1)
goto end_rename;
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto end_rename;
}
retval = -EIO;
dir_bh = sysv_file_bread(old_inode, 0, 0);
if (!dir_bh)
goto end_rename;
if (PARENT_INO(dir_bh->b_data) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir->i_nlink >= new_dir->i_sb->sv_link_max)
goto end_rename;
}
if (!new_bh) {
retval = sysv_add_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_bh, &new_de);
if (retval)
goto end_rename;
}
/* sanity checking before doing the rename - avoid races */
if (new_inode && (new_de->inode != new_inode->i_ino))
goto try_again;
if (new_de->inode && !new_inode)
goto try_again;
if (old_de->inode != old_inode->i_ino)
goto try_again;
/* ok, that's it */
old_de->inode = 0;
new_de->inode = old_inode->i_ino;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(new_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
mark_buffer_dirty(old_bh, 1);
mark_buffer_dirty(new_bh, 1);
if (dir_bh) {
PARENT_INO(dir_bh->b_data) = new_dir->i_ino;
mark_buffer_dirty(dir_bh, 1);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
d_move(old_dentry, new_dentry);
retval = 0;
end_rename:
brelse(dir_bh);
brelse(old_bh);
brelse(new_bh);
return retval;
}
