int minix_create(struct inode * dir, struct dentry *dentry, int mode)
{
int error;
struct inode * inode;
struct buffer_head * bh;
struct minix_dir_entry * de;
if (!dir)
return -ENOENT;
inode = minix_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_op = &minix_file_inode_operations;
inode->i_mode = mode;
mark_inode_dirty(inode);
error = minix_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 minix_mknod(register struct inode *dir, char *name, size_t len,
int mode, int rdev)
{
int error;
register struct inode *inode;
struct buffer_head *bh;
struct minix_dir_entry *de;
/* if (!dir)
return -ENOENT;*/ /* Already checked by do_mknod() */
error = -EEXIST;
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
unmap_brelse(bh);
goto mknod2;
}
error = -ENOSPC;
inode = minix_new_inode(dir, (__u16)mode);
if (!inode)
goto mknod2;
/*----------------------------------------------------------------------*/
if (S_ISBLK(mode) || S_ISCHR(mode))
inode->i_rdev = to_kdev_t(rdev);
/*----------------------------------------------------------------------*/
error = minix_add_entry(dir, name, len, inode->i_ino);
if (error) {
inode->i_nlink--;
inode->i_dirt = 1;
}
iput(inode);
mknod2:
iput(dir);
return error;
}
int minix_create(register struct inode *dir, char *name, size_t len,
int mode, struct inode **result)
{
register struct inode *inode = NULL;
int error;
error = -ENOENT;
if (!dir)
goto create2;
error = -ENOSPC;
inode = minix_new_inode(dir, (__u16)mode);
if (!inode)
goto create1;
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
error = minix_add_entry(dir, name, len, inode->i_ino);
if(error) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
inode = NULL;
}
create1:
iput(dir);
create2:
*result = inode;
return error;
}
int minix_mkdir(register struct inode *dir, char *name, size_t len, int mode)
{
int error;
register struct inode *inode;
struct buffer_head *bh;
struct minix_dir_entry *de;
error = -EINVAL;
if (!dir || !dir->i_sb)
goto mkdir2;
error = -EMLINK;
if (dir->i_nlink >= MINIX_LINK_MAX)
goto mkdir2;
error = -EEXIST;
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
unmap_brelse(bh);
goto mkdir2;
}
error = -ENOSPC;
inode = minix_new_inode(dir, (__u16)mode);
if (!inode)
goto mkdir2;
/*--------------------------------------------------------------------------------*/
debug("m_mkdir: new_inode succeeded\n");
debug("m_mkdir: starting minix_bread\n");
bh = minix_bread(inode, 0, 1);
if (!bh) {
goto mkdir1;
}
debug("m_mkdir: read succeeded\n");
inode->i_size = (dir->i_sb->u.minix_sb.s_dirsize << 1);
map_buffer(bh);
de = (struct minix_dir_entry *) bh->b_data;
de->inode = inode->i_ino;
strcpy(de->name, ".");
de = (struct minix_dir_entry *)(((char *)de) + dir->i_sb->u.minix_sb.s_dirsize);
de->inode = dir->i_ino;
strcpy(de->name, "..");
mark_buffer_dirty(bh, 1);
unmap_brelse(bh);
debug("m_mkdir: dir_block update succeeded\n");
/*--------------------------------------------------------------------------------*/
error = minix_add_entry(dir, name, len, inode->i_ino);
if (error) {
mkdir1:
inode->i_nlink--;
}
else {
inode->i_nlink++;
dir->i_nlink++;
}
inode->i_dirt = 1;
iput(inode);
mkdir2:
iput(dir);
debug("m_mkdir: done!\n");
return error;
}
int minix_create(register struct inode *dir, char *name, size_t len,
int mode, struct inode **result)
{
register struct inode *inode;
struct buffer_head *bh;
struct minix_dir_entry *de;
int error;
*result = NULL;
if (!dir)
return -ENOENT;
inode = minix_new_inode(dir);
if (!inode) {
iput(dir);
return -ENOSPC;
}
inode->i_op = &minix_file_inode_operations;
inode->i_mode = (__u16) mode;
inode->i_dirt = 1;
error = minix_add_entry(dir, name, len, &bh, &de);
if (error) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
iput(dir);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
iput(dir);
*result = inode;
return 0;
}
int minix_link(register struct inode *oldinode, register struct inode *dir,
char *name, size_t len)
{
int error;
struct buffer_head *bh;
struct minix_dir_entry *de;
error = -EPERM;
if (S_ISDIR(oldinode->i_mode))
goto mlink_err;
error = -EMLINK;
if (oldinode->i_nlink >= MINIX_LINK_MAX)
goto mlink_err;
error = -EEXIST;
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
unmap_brelse(bh);
goto mlink_err;
}
error = minix_add_entry(dir, name, len, oldinode->i_ino);
if (!error) {
oldinode->i_nlink++;
oldinode->i_ctime = CURRENT_TIME;
oldinode->i_dirt = 1;
}
mlink_err:
iput(oldinode);
iput(dir);
return error;
}
int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
{
int error;
struct inode * inode;
struct buffer_head * bh, *dir_block;
struct minix_dir_entry * de;
struct minix_sb_info * info;
if (!dir || !dir->i_sb)
return -EINVAL;
info = &dir->i_sb->u.minix_sb;
bh = minix_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
if (dir->i_nlink >= info->s_link_max)
return -EMLINK;
inode = minix_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_op = &minix_dir_inode_operations;
inode->i_size = 2 * info->s_dirsize;
dir_block = minix_bread(inode,0,1);
if (!dir_block) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return -ENOSPC;
}
de = (struct minix_dir_entry *) dir_block->b_data;
de->inode=inode->i_ino;
strcpy(de->name,".");
de = (struct minix_dir_entry *) (dir_block->b_data + info->s_dirsize);
de->inode = dir->i_ino;
strcpy(de->name,"..");
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 = minix_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;
}
int minix_symlink(struct inode *dir, char *name, size_t len, char *symname)
{
struct minix_dir_entry *de;
register struct inode *inode = NULL;
struct buffer_head *bh = NULL;
register struct buffer_head *name_block = NULL;
int i;
char c;
if (!(inode = minix_new_inode(dir))) {
iput(dir);
return -ENOSPC;
}
inode->i_mode = (__u16) (S_IFLNK | 0777);
inode->i_op = &minix_symlink_inode_operations;
name_block = minix_bread(inode, 0, 1);
if (!name_block) {
iput(dir);
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
return -ENOSPC;
}
map_buffer(name_block);
i = 0;
while (i < 1023 && (c = *(symname++)))
name_block->b_data[i++] = c;
name_block->b_data[i] = 0;
mark_buffer_dirty(name_block, 1);
unmap_brelse(name_block);
inode->i_size = (__u32) i;
inode->i_dirt = 1;
bh = minix_find_entry(dir, name, len, &de);
map_buffer(bh);
if (bh) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
unmap_brelse(bh);
iput(dir);
return -EEXIST;
}
i = minix_add_entry(dir, name, len, &bh, &de);
if (i) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
iput(dir);
return i;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
iput(dir);
iput(inode);
return 0;
}
int minix_symlink(struct inode * dir, struct dentry *dentry,
const char * symname)
{
struct minix_dir_entry * de;
struct inode * inode = NULL;
struct buffer_head * bh = NULL, * name_block = NULL;
int i;
char c;
if (!(inode = minix_new_inode(dir)))
return -ENOSPC;
inode->i_mode = S_IFLNK | 0777;
inode->i_op = &minix_symlink_inode_operations;
name_block = minix_bread(inode,0,1);
if (!name_block) {
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
return -ENOSPC;
}
i = 0;
while (i < 1023 && (c=*(symname++)))
name_block->b_data[i++] = c;
name_block->b_data[i] = 0;
mark_buffer_dirty(name_block, 1);
brelse(name_block);
inode->i_size = i;
mark_inode_dirty(inode);
bh = minix_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 = minix_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 minix_mknod(struct inode * dir, struct dentry *dentry, int mode, int rdev)
{
int error;
struct inode * inode;
struct buffer_head * bh;
struct minix_dir_entry * de;
if (!dir)
return -ENOENT;
bh = minix_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
inode = minix_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 = &minix_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 = minix_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 minix_symlink(struct inode *dir, char *name, size_t len, char *symname)
{
int error;
register struct inode *inode;
register struct buffer_head *bh;
struct minix_dir_entry *de;
error = -EEXIST;
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
unmap_brelse(bh);
goto symlink2;
}
error = -ENOSPC;
inode = minix_new_inode(dir, S_IFLNK);
if (!inode)
goto symlink2;
/*----------------------------------------------------------------------*/
bh = minix_bread(inode, 0, 1);
if (!bh)
goto symlink1;
map_buffer(bh);
if((error = strlen_fromfs(symname)) > 1023)
error = 1023;
memcpy_fromfs(bh->b_data, symname, error);
bh->b_data[error] = 0;
inode->i_size = (__u32) error;
mark_buffer_dirty(bh, 1);
unmap_brelse(bh);
/*----------------------------------------------------------------------*/
error = minix_add_entry(dir, name, len, inode->i_ino);
if (error) {
symlink1:
inode->i_nlink--;
inode->i_dirt = 1;
}
iput(inode);
symlink2:
iput(dir);
return error;
}
int minix_link(register struct inode *oldinode, register struct inode *dir,
char *name, size_t len)
{
int error;
struct minix_dir_entry *de;
struct buffer_head *bh;
if (S_ISDIR(oldinode->i_mode)) {
iput(oldinode);
iput(dir);
return -EPERM;
}
if (oldinode->i_nlink >= MINIX_LINK_MAX) {
iput(oldinode);
iput(dir);
return -EMLINK;
}
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
brelse(bh);
iput(dir);
iput(oldinode);
return -EEXIST;
}
error = minix_add_entry(dir, name, len, &bh, &de);
if (error) {
iput(dir);
iput(oldinode);
return error;
}
de->inode = oldinode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
iput(dir);
oldinode->i_nlink++;
oldinode->i_ctime = CURRENT_TIME;
oldinode->i_dirt = 1;
iput(oldinode);
return 0;
}
int minix_create(register struct inode *dir, char *name, size_t len,
int mode, struct inode **result)
{
register struct inode *inode = NULL;
int error;
if (!dir)
error = -ENOENT;
else if (!(inode = minix_new_inode(dir, (__u16)mode)))
error = -ENOSPC;
else {
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
if ((error = minix_add_entry(dir, name, len, inode->i_ino))) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
inode = NULL;
}
iput(dir);
}
*result = inode;
return error;
}
int minix_link(struct dentry * old_dentry, struct inode * dir,
struct dentry *dentry)
{
int error;
struct inode *inode = old_dentry->d_inode;
struct minix_dir_entry * de;
struct buffer_head * bh;
if (S_ISDIR(inode->i_mode))
return -EPERM;
if (inode->i_nlink >= inode->i_sb->u.minix_sb.s_link_max)
return -EMLINK;
bh = minix_find_entry(dir, dentry->d_name.name,
dentry->d_name.len, &de);
if (bh) {
brelse(bh);
return -EEXIST;
}
error = minix_add_entry(dir, dentry->d_name.name,
dentry->d_name.len, &bh, &de);
if (error) {
brelse(bh);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
inode->i_nlink++;
inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
inode->i_count++;
d_instantiate(dentry, inode);
return 0;
}
int minix_mknod(register struct inode *dir, char *name, size_t len,
int mode, int rdev)
{
int error;
register struct inode *inode;
struct buffer_head *bh;
struct minix_dir_entry *de;
if (!dir)
return -ENOENT;
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
brelse(bh);
iput(dir);
return -EEXIST;
}
inode = minix_new_inode(dir);
if (!inode) {
iput(dir);
return -ENOSPC;
}
inode->i_uid = current->euid;
inode->i_mode = (__u16) mode;
inode->i_op = NULL;
minix_set_ops(inode);
if (S_ISDIR(inode->i_mode))
if (dir->i_mode & S_ISGID)
inode->i_mode |= S_ISGID;
if (S_ISBLK(mode) || S_ISCHR(mode))
inode->i_rdev = to_kdev_t(rdev);
inode->i_dirt = 1;
error = minix_add_entry(dir, name, len, &bh, &de);
#if 1
if (error) {
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
iput(dir);
return error;
}
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
iput(dir);
iput(inode);
return 0;
#else /* MJN3: If the ordering of the iput()s isn't important, do this. */
if (error) {
inode->i_nlink--;
inode->i_dirt = 1;
} else {
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
brelse(bh);
}
iput(dir);
iput(inode);
return error;
#endif
}
int minix_mkdir(register struct inode *dir, char *name, size_t len, int mode)
{
int error;
register struct inode *inode;
struct buffer_head *dir_block;
struct buffer_head *bh;
struct minix_dir_entry *de;
if (!dir || !dir->i_sb) {
iput(dir);
return -EINVAL;
}
bh = minix_find_entry(dir, name, len, &de);
if (bh) {
brelse(bh);
iput(dir);
return -EEXIST;
}
if (dir->i_nlink >= MINIX_LINK_MAX) {
iput(dir);
return -EMLINK;
}
inode = minix_new_inode(dir);
if (!inode) {
iput(dir);
return -ENOSPC;
}
debug("m_mkdir: new_inode succeeded\n");
inode->i_op = &minix_dir_inode_operations;
inode->i_size = 2 * dir->i_sb->u.minix_sb.s_dirsize;
debug("m_mkdir: starting minix_bread\n");
dir_block = minix_bread(inode, 0, 1);
if (!dir_block) {
iput(dir);
inode->i_nlink--;
inode->i_dirt = 1;
iput(inode);
return -ENOSPC;
}
debug("m_mkdir: read succeeded\n");
map_buffer(dir_block);
de = (struct minix_dir_entry *) dir_block->b_data;
de->inode = inode->i_ino;
strcpy(de->name, ".");
de =
(struct minix_dir_entry *) (dir_block->b_data +
dir->i_sb->u.minix_sb.s_dirsize);
de->inode = dir->i_ino;
strcpy(de->name, "..");
inode->i_nlink = 2;
mark_buffer_dirty(dir_block, 1);
unmap_brelse(dir_block);
debug("m_mkdir: dir_block update succeeded\n");
inode->i_mode = S_IFDIR | (mode & 0777 & ~current->fs.umask);
if (dir->i_mode & S_ISGID)
inode->i_mode |= S_ISGID;
inode->i_dirt = 1;
error = minix_add_entry(dir, name, len, &bh, &de);
if (error) {
iput(dir);
inode->i_nlink = 0;
iput(inode);
return error;
}
map_buffer(bh);
de->inode = inode->i_ino;
mark_buffer_dirty(bh, 1);
dir->i_nlink++;
dir->i_dirt = 1;
iput(dir);
iput(inode);
unmap_brelse(bh);
debug("m_mkdir: done!\n");
return 0;
}
/*
* 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;
}