633 lines
16 KiB
C
633 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/hpfs/namei.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* adding & removing files & directories
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*/
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#include <linux/sched.h>
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#include "hpfs_fn.h"
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static void hpfs_update_directory_times(struct inode *dir)
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{
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time64_t t = local_to_gmt(dir->i_sb, local_get_seconds(dir->i_sb));
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if (t == dir->i_mtime.tv_sec &&
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t == dir->i_ctime.tv_sec)
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return;
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dir->i_mtime.tv_sec = dir->i_ctime.tv_sec = t;
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dir->i_mtime.tv_nsec = dir->i_ctime.tv_nsec = 0;
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hpfs_write_inode_nolock(dir);
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}
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static int hpfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct quad_buffer_head qbh0;
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struct buffer_head *bh;
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struct hpfs_dirent *de;
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struct fnode *fnode;
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struct dnode *dnode;
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struct inode *result;
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fnode_secno fno;
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dnode_secno dno;
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int r;
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struct hpfs_dirent dee;
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int err;
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if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
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hpfs_lock(dir->i_sb);
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err = -ENOSPC;
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fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
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if (!fnode)
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goto bail;
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dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0);
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if (!dnode)
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goto bail1;
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memset(&dee, 0, sizeof dee);
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dee.directory = 1;
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if (!(mode & 0222)) dee.read_only = 1;
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/*dee.archive = 0;*/
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dee.hidden = name[0] == '.';
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dee.fnode = cpu_to_le32(fno);
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dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb));
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result = new_inode(dir->i_sb);
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if (!result)
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goto bail2;
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hpfs_init_inode(result);
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result->i_ino = fno;
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hpfs_i(result)->i_parent_dir = dir->i_ino;
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hpfs_i(result)->i_dno = dno;
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result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
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result->i_ctime.tv_nsec = 0;
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result->i_mtime.tv_nsec = 0;
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result->i_atime.tv_nsec = 0;
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hpfs_i(result)->i_ea_size = 0;
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result->i_mode |= S_IFDIR;
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result->i_op = &hpfs_dir_iops;
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result->i_fop = &hpfs_dir_ops;
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result->i_blocks = 4;
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result->i_size = 2048;
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set_nlink(result, 2);
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if (dee.read_only)
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result->i_mode &= ~0222;
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r = hpfs_add_dirent(dir, name, len, &dee);
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if (r == 1)
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goto bail3;
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if (r == -1) {
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err = -EEXIST;
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goto bail3;
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}
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fnode->len = len;
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memcpy(fnode->name, name, len > 15 ? 15 : len);
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fnode->up = cpu_to_le32(dir->i_ino);
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fnode->flags |= FNODE_dir;
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fnode->btree.n_free_nodes = 7;
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fnode->btree.n_used_nodes = 1;
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fnode->btree.first_free = cpu_to_le16(0x14);
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fnode->u.external[0].disk_secno = cpu_to_le32(dno);
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fnode->u.external[0].file_secno = cpu_to_le32(-1);
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dnode->root_dnode = 1;
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dnode->up = cpu_to_le32(fno);
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de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
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de->creation_date = de->write_date = de->read_date = cpu_to_le32(local_get_seconds(dir->i_sb));
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if (!(mode & 0222)) de->read_only = 1;
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de->first = de->directory = 1;
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/*de->hidden = de->system = 0;*/
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de->fnode = cpu_to_le32(fno);
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mark_buffer_dirty(bh);
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brelse(bh);
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hpfs_mark_4buffers_dirty(&qbh0);
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hpfs_brelse4(&qbh0);
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inc_nlink(dir);
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insert_inode_hash(result);
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if (!uid_eq(result->i_uid, current_fsuid()) ||
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!gid_eq(result->i_gid, current_fsgid()) ||
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result->i_mode != (mode | S_IFDIR)) {
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result->i_uid = current_fsuid();
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result->i_gid = current_fsgid();
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result->i_mode = mode | S_IFDIR;
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hpfs_write_inode_nolock(result);
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}
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hpfs_update_directory_times(dir);
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d_instantiate(dentry, result);
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hpfs_unlock(dir->i_sb);
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return 0;
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bail3:
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iput(result);
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bail2:
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hpfs_brelse4(&qbh0);
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hpfs_free_dnode(dir->i_sb, dno);
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bail1:
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brelse(bh);
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hpfs_free_sectors(dir->i_sb, fno, 1);
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bail:
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hpfs_unlock(dir->i_sb);
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return err;
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}
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static int hpfs_create(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct inode *result = NULL;
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struct buffer_head *bh;
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struct fnode *fnode;
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fnode_secno fno;
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int r;
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struct hpfs_dirent dee;
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int err;
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if ((err = hpfs_chk_name(name, &len)))
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return err==-ENOENT ? -EINVAL : err;
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hpfs_lock(dir->i_sb);
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err = -ENOSPC;
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fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
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if (!fnode)
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goto bail;
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memset(&dee, 0, sizeof dee);
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if (!(mode & 0222)) dee.read_only = 1;
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dee.archive = 1;
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dee.hidden = name[0] == '.';
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dee.fnode = cpu_to_le32(fno);
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dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb));
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result = new_inode(dir->i_sb);
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if (!result)
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goto bail1;
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hpfs_init_inode(result);
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result->i_ino = fno;
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result->i_mode |= S_IFREG;
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result->i_mode &= ~0111;
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result->i_op = &hpfs_file_iops;
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result->i_fop = &hpfs_file_ops;
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set_nlink(result, 1);
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hpfs_i(result)->i_parent_dir = dir->i_ino;
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result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
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result->i_ctime.tv_nsec = 0;
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result->i_mtime.tv_nsec = 0;
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result->i_atime.tv_nsec = 0;
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hpfs_i(result)->i_ea_size = 0;
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if (dee.read_only)
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result->i_mode &= ~0222;
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result->i_blocks = 1;
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result->i_size = 0;
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result->i_data.a_ops = &hpfs_aops;
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hpfs_i(result)->mmu_private = 0;
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r = hpfs_add_dirent(dir, name, len, &dee);
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if (r == 1)
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goto bail2;
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if (r == -1) {
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err = -EEXIST;
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goto bail2;
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}
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fnode->len = len;
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memcpy(fnode->name, name, len > 15 ? 15 : len);
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fnode->up = cpu_to_le32(dir->i_ino);
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mark_buffer_dirty(bh);
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brelse(bh);
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insert_inode_hash(result);
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if (!uid_eq(result->i_uid, current_fsuid()) ||
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!gid_eq(result->i_gid, current_fsgid()) ||
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result->i_mode != (mode | S_IFREG)) {
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result->i_uid = current_fsuid();
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result->i_gid = current_fsgid();
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result->i_mode = mode | S_IFREG;
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hpfs_write_inode_nolock(result);
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}
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hpfs_update_directory_times(dir);
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d_instantiate(dentry, result);
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hpfs_unlock(dir->i_sb);
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return 0;
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bail2:
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iput(result);
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bail1:
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brelse(bh);
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hpfs_free_sectors(dir->i_sb, fno, 1);
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bail:
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hpfs_unlock(dir->i_sb);
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return err;
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}
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static int hpfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode, dev_t rdev)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct buffer_head *bh;
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struct fnode *fnode;
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fnode_secno fno;
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int r;
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struct hpfs_dirent dee;
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struct inode *result = NULL;
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int err;
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if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
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if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
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hpfs_lock(dir->i_sb);
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err = -ENOSPC;
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fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
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if (!fnode)
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goto bail;
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memset(&dee, 0, sizeof dee);
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if (!(mode & 0222)) dee.read_only = 1;
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dee.archive = 1;
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dee.hidden = name[0] == '.';
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dee.fnode = cpu_to_le32(fno);
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dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb));
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result = new_inode(dir->i_sb);
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if (!result)
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goto bail1;
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hpfs_init_inode(result);
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result->i_ino = fno;
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hpfs_i(result)->i_parent_dir = dir->i_ino;
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result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
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result->i_ctime.tv_nsec = 0;
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result->i_mtime.tv_nsec = 0;
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result->i_atime.tv_nsec = 0;
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hpfs_i(result)->i_ea_size = 0;
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result->i_uid = current_fsuid();
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result->i_gid = current_fsgid();
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set_nlink(result, 1);
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result->i_size = 0;
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result->i_blocks = 1;
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init_special_inode(result, mode, rdev);
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r = hpfs_add_dirent(dir, name, len, &dee);
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if (r == 1)
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goto bail2;
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if (r == -1) {
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err = -EEXIST;
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goto bail2;
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}
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fnode->len = len;
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memcpy(fnode->name, name, len > 15 ? 15 : len);
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fnode->up = cpu_to_le32(dir->i_ino);
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mark_buffer_dirty(bh);
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insert_inode_hash(result);
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hpfs_write_inode_nolock(result);
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hpfs_update_directory_times(dir);
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d_instantiate(dentry, result);
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brelse(bh);
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hpfs_unlock(dir->i_sb);
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return 0;
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bail2:
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iput(result);
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bail1:
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brelse(bh);
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hpfs_free_sectors(dir->i_sb, fno, 1);
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bail:
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hpfs_unlock(dir->i_sb);
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return err;
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}
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static int hpfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, const char *symlink)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct buffer_head *bh;
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struct fnode *fnode;
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fnode_secno fno;
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int r;
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struct hpfs_dirent dee;
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struct inode *result;
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int err;
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if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
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hpfs_lock(dir->i_sb);
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if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
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hpfs_unlock(dir->i_sb);
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return -EPERM;
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}
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err = -ENOSPC;
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fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
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if (!fnode)
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goto bail;
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memset(&dee, 0, sizeof dee);
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dee.archive = 1;
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dee.hidden = name[0] == '.';
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dee.fnode = cpu_to_le32(fno);
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dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb));
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result = new_inode(dir->i_sb);
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if (!result)
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goto bail1;
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result->i_ino = fno;
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hpfs_init_inode(result);
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hpfs_i(result)->i_parent_dir = dir->i_ino;
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result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
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result->i_ctime.tv_nsec = 0;
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result->i_mtime.tv_nsec = 0;
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result->i_atime.tv_nsec = 0;
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hpfs_i(result)->i_ea_size = 0;
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result->i_mode = S_IFLNK | 0777;
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result->i_uid = current_fsuid();
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result->i_gid = current_fsgid();
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result->i_blocks = 1;
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set_nlink(result, 1);
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result->i_size = strlen(symlink);
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inode_nohighmem(result);
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result->i_op = &page_symlink_inode_operations;
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result->i_data.a_ops = &hpfs_symlink_aops;
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r = hpfs_add_dirent(dir, name, len, &dee);
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if (r == 1)
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goto bail2;
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if (r == -1) {
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err = -EEXIST;
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goto bail2;
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}
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fnode->len = len;
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memcpy(fnode->name, name, len > 15 ? 15 : len);
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fnode->up = cpu_to_le32(dir->i_ino);
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hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink));
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mark_buffer_dirty(bh);
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brelse(bh);
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insert_inode_hash(result);
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hpfs_write_inode_nolock(result);
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hpfs_update_directory_times(dir);
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d_instantiate(dentry, result);
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hpfs_unlock(dir->i_sb);
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return 0;
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bail2:
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iput(result);
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bail1:
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brelse(bh);
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hpfs_free_sectors(dir->i_sb, fno, 1);
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bail:
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hpfs_unlock(dir->i_sb);
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return err;
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}
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static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct quad_buffer_head qbh;
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struct hpfs_dirent *de;
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struct inode *inode = d_inode(dentry);
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dnode_secno dno;
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int r;
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int err;
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hpfs_lock(dir->i_sb);
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hpfs_adjust_length(name, &len);
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err = -ENOENT;
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de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
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if (!de)
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goto out;
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err = -EPERM;
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if (de->first)
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goto out1;
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err = -EISDIR;
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if (de->directory)
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goto out1;
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r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
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switch (r) {
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case 1:
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hpfs_error(dir->i_sb, "there was error when removing dirent");
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err = -EFSERROR;
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break;
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case 2: /* no space for deleting */
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err = -ENOSPC;
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break;
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default:
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drop_nlink(inode);
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err = 0;
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}
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goto out;
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out1:
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hpfs_brelse4(&qbh);
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out:
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if (!err)
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hpfs_update_directory_times(dir);
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hpfs_unlock(dir->i_sb);
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return err;
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}
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static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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const unsigned char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct quad_buffer_head qbh;
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struct hpfs_dirent *de;
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struct inode *inode = d_inode(dentry);
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dnode_secno dno;
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int n_items = 0;
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int err;
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int r;
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hpfs_adjust_length(name, &len);
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hpfs_lock(dir->i_sb);
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err = -ENOENT;
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de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
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if (!de)
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goto out;
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err = -EPERM;
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if (de->first)
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goto out1;
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err = -ENOTDIR;
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if (!de->directory)
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goto out1;
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|
|
hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items);
|
|
err = -ENOTEMPTY;
|
|
if (n_items)
|
|
goto out1;
|
|
|
|
r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
|
|
switch (r) {
|
|
case 1:
|
|
hpfs_error(dir->i_sb, "there was error when removing dirent");
|
|
err = -EFSERROR;
|
|
break;
|
|
case 2:
|
|
err = -ENOSPC;
|
|
break;
|
|
default:
|
|
drop_nlink(dir);
|
|
clear_nlink(inode);
|
|
err = 0;
|
|
}
|
|
goto out;
|
|
out1:
|
|
hpfs_brelse4(&qbh);
|
|
out:
|
|
if (!err)
|
|
hpfs_update_directory_times(dir);
|
|
hpfs_unlock(dir->i_sb);
|
|
return err;
|
|
}
|
|
|
|
static int hpfs_symlink_readpage(struct file *file, struct page *page)
|
|
{
|
|
char *link = page_address(page);
|
|
struct inode *i = page->mapping->host;
|
|
struct fnode *fnode;
|
|
struct buffer_head *bh;
|
|
int err;
|
|
|
|
err = -EIO;
|
|
hpfs_lock(i->i_sb);
|
|
if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
|
|
goto fail;
|
|
err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
|
|
brelse(bh);
|
|
if (err)
|
|
goto fail;
|
|
hpfs_unlock(i->i_sb);
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
return 0;
|
|
|
|
fail:
|
|
hpfs_unlock(i->i_sb);
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
return err;
|
|
}
|
|
|
|
const struct address_space_operations hpfs_symlink_aops = {
|
|
.readpage = hpfs_symlink_readpage
|
|
};
|
|
|
|
static int hpfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
|
|
struct dentry *old_dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, unsigned int flags)
|
|
{
|
|
const unsigned char *old_name = old_dentry->d_name.name;
|
|
unsigned old_len = old_dentry->d_name.len;
|
|
const unsigned char *new_name = new_dentry->d_name.name;
|
|
unsigned new_len = new_dentry->d_name.len;
|
|
struct inode *i = d_inode(old_dentry);
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct quad_buffer_head qbh, qbh1;
|
|
struct hpfs_dirent *dep, *nde;
|
|
struct hpfs_dirent de;
|
|
dnode_secno dno;
|
|
int r;
|
|
struct buffer_head *bh;
|
|
struct fnode *fnode;
|
|
int err;
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
if ((err = hpfs_chk_name(new_name, &new_len))) return err;
|
|
err = 0;
|
|
hpfs_adjust_length(old_name, &old_len);
|
|
|
|
hpfs_lock(i->i_sb);
|
|
/* order doesn't matter, due to VFS exclusion */
|
|
|
|
/* Erm? Moving over the empty non-busy directory is perfectly legal */
|
|
if (new_inode && S_ISDIR(new_inode->i_mode)) {
|
|
err = -EINVAL;
|
|
goto end1;
|
|
}
|
|
|
|
if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
|
|
hpfs_error(i->i_sb, "lookup succeeded but map dirent failed");
|
|
err = -ENOENT;
|
|
goto end1;
|
|
}
|
|
copy_de(&de, dep);
|
|
de.hidden = new_name[0] == '.';
|
|
|
|
if (new_inode) {
|
|
int r;
|
|
if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
|
|
if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) {
|
|
clear_nlink(new_inode);
|
|
copy_de(nde, &de);
|
|
memcpy(nde->name, new_name, new_len);
|
|
hpfs_mark_4buffers_dirty(&qbh1);
|
|
hpfs_brelse4(&qbh1);
|
|
goto end;
|
|
}
|
|
hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
|
|
err = -EFSERROR;
|
|
goto end1;
|
|
}
|
|
err = -ENOSPC;
|
|
goto end1;
|
|
}
|
|
|
|
if (new_dir == old_dir) hpfs_brelse4(&qbh);
|
|
|
|
if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) {
|
|
if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
|
|
err = r == 1 ? -ENOSPC : -EFSERROR;
|
|
if (new_dir != old_dir) hpfs_brelse4(&qbh);
|
|
goto end1;
|
|
}
|
|
|
|
if (new_dir == old_dir)
|
|
if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
|
|
hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
|
|
err = -ENOENT;
|
|
goto end1;
|
|
}
|
|
|
|
if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
|
|
hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
|
|
err = r == 2 ? -ENOSPC : -EFSERROR;
|
|
goto end1;
|
|
}
|
|
|
|
end:
|
|
hpfs_i(i)->i_parent_dir = new_dir->i_ino;
|
|
if (S_ISDIR(i->i_mode)) {
|
|
inc_nlink(new_dir);
|
|
drop_nlink(old_dir);
|
|
}
|
|
if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
|
|
fnode->up = cpu_to_le32(new_dir->i_ino);
|
|
fnode->len = new_len;
|
|
memcpy(fnode->name, new_name, new_len>15?15:new_len);
|
|
if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
}
|
|
end1:
|
|
if (!err) {
|
|
hpfs_update_directory_times(old_dir);
|
|
hpfs_update_directory_times(new_dir);
|
|
}
|
|
hpfs_unlock(i->i_sb);
|
|
return err;
|
|
}
|
|
|
|
const struct inode_operations hpfs_dir_iops =
|
|
{
|
|
.create = hpfs_create,
|
|
.lookup = hpfs_lookup,
|
|
.unlink = hpfs_unlink,
|
|
.symlink = hpfs_symlink,
|
|
.mkdir = hpfs_mkdir,
|
|
.rmdir = hpfs_rmdir,
|
|
.mknod = hpfs_mknod,
|
|
.rename = hpfs_rename,
|
|
.setattr = hpfs_setattr,
|
|
};
|