diff options
Diffstat (limited to 'fs/hpfs/namei.c')
| -rw-r--r-- | fs/hpfs/namei.c | 633 |
1 files changed, 633 insertions, 0 deletions
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c new file mode 100644 index 000000000..15fc63276 --- /dev/null +++ b/fs/hpfs/namei.c @@ -0,0 +1,633 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/hpfs/namei.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * adding & removing files & directories + */ +#include <linux/sched.h> +#include "hpfs_fn.h" + +static void hpfs_update_directory_times(struct inode *dir) +{ + time64_t t = local_to_gmt(dir->i_sb, local_get_seconds(dir->i_sb)); + if (t == dir->i_mtime.tv_sec && + t == dir->i_ctime.tv_sec) + return; + dir->i_mtime.tv_sec = dir->i_ctime.tv_sec = t; + dir->i_mtime.tv_nsec = dir->i_ctime.tv_nsec = 0; + hpfs_write_inode_nolock(dir); +} + +static int hpfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct quad_buffer_head qbh0; + struct buffer_head *bh; + struct hpfs_dirent *de; + struct fnode *fnode; + struct dnode *dnode; + struct inode *result; + fnode_secno fno; + dnode_secno dno; + int r; + struct hpfs_dirent dee; + int err; + if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; + hpfs_lock(dir->i_sb); + err = -ENOSPC; + fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); + if (!fnode) + goto bail; + dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0); + if (!dnode) + goto bail1; + memset(&dee, 0, sizeof dee); + dee.directory = 1; + if (!(mode & 0222)) dee.read_only = 1; + /*dee.archive = 0;*/ + dee.hidden = name[0] == '.'; + dee.fnode = cpu_to_le32(fno); + dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb)); + result = new_inode(dir->i_sb); + if (!result) + goto bail2; + hpfs_init_inode(result); + result->i_ino = fno; + hpfs_i(result)->i_parent_dir = dir->i_ino; + hpfs_i(result)->i_dno = dno; + 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)); + result->i_ctime.tv_nsec = 0; + result->i_mtime.tv_nsec = 0; + result->i_atime.tv_nsec = 0; + hpfs_i(result)->i_ea_size = 0; + result->i_mode |= S_IFDIR; + result->i_op = &hpfs_dir_iops; + result->i_fop = &hpfs_dir_ops; + result->i_blocks = 4; + result->i_size = 2048; + set_nlink(result, 2); + if (dee.read_only) + result->i_mode &= ~0222; + + r = hpfs_add_dirent(dir, name, len, &dee); + if (r == 1) + goto bail3; + if (r == -1) { + err = -EEXIST; + goto bail3; + } + fnode->len = len; + memcpy(fnode->name, name, len > 15 ? 15 : len); + fnode->up = cpu_to_le32(dir->i_ino); + fnode->flags |= FNODE_dir; + fnode->btree.n_free_nodes = 7; + fnode->btree.n_used_nodes = 1; + fnode->btree.first_free = cpu_to_le16(0x14); + fnode->u.external[0].disk_secno = cpu_to_le32(dno); + fnode->u.external[0].file_secno = cpu_to_le32(-1); + dnode->root_dnode = 1; + dnode->up = cpu_to_le32(fno); + de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0); + de->creation_date = de->write_date = de->read_date = cpu_to_le32(local_get_seconds(dir->i_sb)); + if (!(mode & 0222)) de->read_only = 1; + de->first = de->directory = 1; + /*de->hidden = de->system = 0;*/ + de->fnode = cpu_to_le32(fno); + mark_buffer_dirty(bh); + brelse(bh); + hpfs_mark_4buffers_dirty(&qbh0); + hpfs_brelse4(&qbh0); + inc_nlink(dir); + insert_inode_hash(result); + + if (!uid_eq(result->i_uid, current_fsuid()) || + !gid_eq(result->i_gid, current_fsgid()) || + result->i_mode != (mode | S_IFDIR)) { + result->i_uid = current_fsuid(); + result->i_gid = current_fsgid(); + result->i_mode = mode | S_IFDIR; + hpfs_write_inode_nolock(result); + } + hpfs_update_directory_times(dir); + d_instantiate(dentry, result); + hpfs_unlock(dir->i_sb); + return 0; +bail3: + iput(result); +bail2: + hpfs_brelse4(&qbh0); + hpfs_free_dnode(dir->i_sb, dno); +bail1: + brelse(bh); + hpfs_free_sectors(dir->i_sb, fno, 1); +bail: + hpfs_unlock(dir->i_sb); + return err; +} + +static int hpfs_create(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, bool excl) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct inode *result = NULL; + struct buffer_head *bh; + struct fnode *fnode; + fnode_secno fno; + int r; + struct hpfs_dirent dee; + int err; + if ((err = hpfs_chk_name(name, &len))) + return err==-ENOENT ? -EINVAL : err; + hpfs_lock(dir->i_sb); + err = -ENOSPC; + fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); + if (!fnode) + goto bail; + memset(&dee, 0, sizeof dee); + if (!(mode & 0222)) dee.read_only = 1; + dee.archive = 1; + dee.hidden = name[0] == '.'; + dee.fnode = cpu_to_le32(fno); + dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb)); + + result = new_inode(dir->i_sb); + if (!result) + goto bail1; + + hpfs_init_inode(result); + result->i_ino = fno; + result->i_mode |= S_IFREG; + result->i_mode &= ~0111; + result->i_op = &hpfs_file_iops; + result->i_fop = &hpfs_file_ops; + set_nlink(result, 1); + hpfs_i(result)->i_parent_dir = dir->i_ino; + 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)); + result->i_ctime.tv_nsec = 0; + result->i_mtime.tv_nsec = 0; + result->i_atime.tv_nsec = 0; + hpfs_i(result)->i_ea_size = 0; + if (dee.read_only) + result->i_mode &= ~0222; + result->i_blocks = 1; + result->i_size = 0; + result->i_data.a_ops = &hpfs_aops; + hpfs_i(result)->mmu_private = 0; + + r = hpfs_add_dirent(dir, name, len, &dee); + if (r == 1) + goto bail2; + if (r == -1) { + err = -EEXIST; + goto bail2; + } + fnode->len = len; + memcpy(fnode->name, name, len > 15 ? 15 : len); + fnode->up = cpu_to_le32(dir->i_ino); + mark_buffer_dirty(bh); + brelse(bh); + + insert_inode_hash(result); + + if (!uid_eq(result->i_uid, current_fsuid()) || + !gid_eq(result->i_gid, current_fsgid()) || + result->i_mode != (mode | S_IFREG)) { + result->i_uid = current_fsuid(); + result->i_gid = current_fsgid(); + result->i_mode = mode | S_IFREG; + hpfs_write_inode_nolock(result); + } + hpfs_update_directory_times(dir); + d_instantiate(dentry, result); + hpfs_unlock(dir->i_sb); + return 0; + +bail2: + iput(result); +bail1: + brelse(bh); + hpfs_free_sectors(dir->i_sb, fno, 1); +bail: + hpfs_unlock(dir->i_sb); + return err; +} + +static int hpfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, dev_t rdev) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct buffer_head *bh; + struct fnode *fnode; + fnode_secno fno; + int r; + struct hpfs_dirent dee; + struct inode *result = NULL; + int err; + if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; + if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM; + hpfs_lock(dir->i_sb); + err = -ENOSPC; + fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); + if (!fnode) + goto bail; + memset(&dee, 0, sizeof dee); + if (!(mode & 0222)) dee.read_only = 1; + dee.archive = 1; + dee.hidden = name[0] == '.'; + dee.fnode = cpu_to_le32(fno); + dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb)); + + result = new_inode(dir->i_sb); + if (!result) + goto bail1; + + hpfs_init_inode(result); + result->i_ino = fno; + hpfs_i(result)->i_parent_dir = dir->i_ino; + 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)); + result->i_ctime.tv_nsec = 0; + result->i_mtime.tv_nsec = 0; + result->i_atime.tv_nsec = 0; + hpfs_i(result)->i_ea_size = 0; + result->i_uid = current_fsuid(); + result->i_gid = current_fsgid(); + set_nlink(result, 1); + result->i_size = 0; + result->i_blocks = 1; + init_special_inode(result, mode, rdev); + + r = hpfs_add_dirent(dir, name, len, &dee); + if (r == 1) + goto bail2; + if (r == -1) { + err = -EEXIST; + goto bail2; + } + fnode->len = len; + memcpy(fnode->name, name, len > 15 ? 15 : len); + fnode->up = cpu_to_le32(dir->i_ino); + mark_buffer_dirty(bh); + + insert_inode_hash(result); + + hpfs_write_inode_nolock(result); + hpfs_update_directory_times(dir); + d_instantiate(dentry, result); + brelse(bh); + hpfs_unlock(dir->i_sb); + return 0; +bail2: + iput(result); +bail1: + brelse(bh); + hpfs_free_sectors(dir->i_sb, fno, 1); +bail: + hpfs_unlock(dir->i_sb); + return err; +} + +static int hpfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, const char *symlink) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct buffer_head *bh; + struct fnode *fnode; + fnode_secno fno; + int r; + struct hpfs_dirent dee; + struct inode *result; + int err; + if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; + hpfs_lock(dir->i_sb); + if (hpfs_sb(dir->i_sb)->sb_eas < 2) { + hpfs_unlock(dir->i_sb); + return -EPERM; + } + err = -ENOSPC; + fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); + if (!fnode) + goto bail; + memset(&dee, 0, sizeof dee); + dee.archive = 1; + dee.hidden = name[0] == '.'; + dee.fnode = cpu_to_le32(fno); + dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(local_get_seconds(dir->i_sb)); + + result = new_inode(dir->i_sb); + if (!result) + goto bail1; + result->i_ino = fno; + hpfs_init_inode(result); + hpfs_i(result)->i_parent_dir = dir->i_ino; + 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)); + result->i_ctime.tv_nsec = 0; + result->i_mtime.tv_nsec = 0; + result->i_atime.tv_nsec = 0; + hpfs_i(result)->i_ea_size = 0; + result->i_mode = S_IFLNK | 0777; + result->i_uid = current_fsuid(); + result->i_gid = current_fsgid(); + result->i_blocks = 1; + set_nlink(result, 1); + result->i_size = strlen(symlink); + inode_nohighmem(result); + result->i_op = &page_symlink_inode_operations; + result->i_data.a_ops = &hpfs_symlink_aops; + + r = hpfs_add_dirent(dir, name, len, &dee); + if (r == 1) + goto bail2; + if (r == -1) { + err = -EEXIST; + goto bail2; + } + fnode->len = len; + memcpy(fnode->name, name, len > 15 ? 15 : len); + fnode->up = cpu_to_le32(dir->i_ino); + hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink)); + mark_buffer_dirty(bh); + brelse(bh); + + insert_inode_hash(result); + + hpfs_write_inode_nolock(result); + hpfs_update_directory_times(dir); + d_instantiate(dentry, result); + hpfs_unlock(dir->i_sb); + return 0; +bail2: + iput(result); +bail1: + brelse(bh); + hpfs_free_sectors(dir->i_sb, fno, 1); +bail: + hpfs_unlock(dir->i_sb); + return err; +} + +static int hpfs_unlink(struct inode *dir, struct dentry *dentry) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct quad_buffer_head qbh; + struct hpfs_dirent *de; + struct inode *inode = d_inode(dentry); + dnode_secno dno; + int r; + int err; + + hpfs_lock(dir->i_sb); + hpfs_adjust_length(name, &len); + + err = -ENOENT; + de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); + if (!de) + goto out; + + err = -EPERM; + if (de->first) + goto out1; + + err = -EISDIR; + if (de->directory) + 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: /* no space for deleting */ + err = -ENOSPC; + break; + default: + drop_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_rmdir(struct inode *dir, struct dentry *dentry) +{ + const unsigned char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct quad_buffer_head qbh; + struct hpfs_dirent *de; + struct inode *inode = d_inode(dentry); + dnode_secno dno; + int n_items = 0; + int err; + int r; + + hpfs_adjust_length(name, &len); + hpfs_lock(dir->i_sb); + err = -ENOENT; + de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); + if (!de) + goto out; + + err = -EPERM; + if (de->first) + goto out1; + + err = -ENOTDIR; + if (!de->directory) + goto out1; + + 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_read_folio(struct file *file, struct folio *folio) +{ + struct page *page = &folio->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 = { + .read_folio = hpfs_symlink_read_folio +}; + +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, +}; |