/*
* 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 retry 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_xiafs_rename(struct inode * old_dir, const char * old_name,
int old_len, struct inode * new_dir,
const char * new_name, int new_len,
int must_be_dir)
{
struct inode * old_inode, * new_inode;
struct buffer_head * old_bh, * new_bh, * dir_bh;
struct xiafs_direct * old_de, * old_de_pre, * new_de, * new_de_pre;
int retval;
try_again:
old_inode = new_inode = NULL;
old_bh = new_bh = dir_bh = NULL;
old_bh = xiafs_find_entry(old_dir, old_name, old_len, &old_de, &old_de_pre);
retval = -ENOENT;
if (!old_bh)
goto end_rename;
old_inode = __iget(old_dir->i_sb, old_de->d_ino, 0); /* don't cross mnt-points */
if (!old_inode)
goto end_rename;
if (must_be_dir && !S_ISDIR(old_inode->i_mode))
goto end_rename;
retval = -EPERM;
if ((old_dir->i_mode & S_ISVTX) &&
current->fsuid != old_inode->i_uid &&
current->fsuid != old_dir->i_uid && !fsuser())
goto end_rename;
new_bh = xiafs_find_entry(new_dir, new_name, new_len, &new_de, NULL);
if (new_bh) {
new_inode = __iget(new_dir->i_sb, new_de->d_ino, 0);
if (!new_inode) {
brelse(new_bh);
new_bh = NULL;
}
}
if (new_inode == old_inode) {
retval = 0;
goto end_rename;
}
if (new_inode && S_ISDIR(new_inode->i_mode)) {
retval = -EEXIST;
goto end_rename;
}
retval = -EPERM;
if (new_inode && (new_dir->i_mode & S_ISVTX) &&
current->fsuid != new_inode->i_uid &&
current->fsuid != new_dir->i_uid && !fsuser())
goto end_rename;
if (S_ISDIR(old_inode->i_mode)) {
retval = -EEXIST;
if (new_bh)
goto end_rename;
if ((retval = permission(old_inode, MAY_WRITE)) != 0)
goto end_rename;
retval = -EINVAL;
if (subdir(new_dir, old_inode))
goto end_rename;
retval = -EIO;
dir_bh = xiafs_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_dir->i_nlink > 64000)
goto end_rename;
}
if (!new_bh)
new_bh = xiafs_add_entry(new_dir, new_name, new_len, &new_de, &new_de_pre);
retval = -ENOSPC;
if (!new_bh)
goto end_rename;
/* sanity checking */
if ( (new_inode && (new_de->d_ino != new_inode->i_ino))
|| (new_de->d_ino && !new_inode)
|| (old_de->d_ino != old_inode->i_ino)) {
xiafs_rm_entry(new_de, new_de_pre);
brelse(old_bh);
brelse(new_bh);
brelse(dir_bh);
iput(old_inode);
iput(new_inode);
current->counter=0;
schedule();
goto try_again;
}
xiafs_rm_entry(old_de, old_de_pre);
new_de->d_ino = old_inode->i_ino;
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_dirt = 1;
}
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--;
new_dir->i_nlink++;
old_dir->i_dirt = 1;
new_dir->i_dirt = 1;
}
retval = 0;
end_rename:
brelse(dir_bh);
brelse(old_bh);
brelse(new_bh);
iput(old_inode);
iput(new_inode);
iput(old_dir);
iput(new_dir);
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_minix_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 minix_dir_entry * old_de, * new_de;
struct minix_sb_info * info;
int retval;
info = &old_dir->i_sb->u.minix_sb;
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 = minix_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;
retval = -EPERM;
new_inode = new_dentry->d_inode;
new_bh = minix_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) {
/* Prune any children before testing for busy */
if (new_dentry->d_count > 1)
shrink_dcache_parent(new_dentry);
retval = -EBUSY;
if (new_dentry->d_count > 1)
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto end_rename;
retval = -EBUSY;
}
retval = -EIO;
dir_bh = minix_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 >= info->s_link_max)
goto end_rename;
}
if (!new_bh) {
retval = minix_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);
old_dir->i_version = ++event;
new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(new_dir);
new_dir->i_version = ++event;
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);
}
}
/* Update the dcache */
d_move(old_dentry, new_dentry);
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;
}