diff options
Diffstat (limited to 'kernel/fs/hpfs/namei.c')
| -rw-r--r-- | kernel/fs/hpfs/namei.c | 628 |
1 files changed, 628 insertions, 0 deletions
diff --git a/kernel/fs/hpfs/namei.c b/kernel/fs/hpfs/namei.c new file mode 100644 index 000000000..a0872f239 --- /dev/null +++ b/kernel/fs/hpfs/namei.c @@ -0,0 +1,628 @@ +/* + * 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 int hpfs_mkdir(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(gmt_to_local(dir->i_sb, get_seconds())); + 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(gmt_to_local(dir->i_sb, get_seconds())); + 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); + } + 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 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(gmt_to_local(dir->i_sb, get_seconds())); + + 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); + } + 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 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; + if (!new_valid_dev(rdev)) + return -EINVAL; + 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(gmt_to_local(dir->i_sb, get_seconds())); + + 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); + 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 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(gmt_to_local(dir->i_sb, get_seconds())); + + 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); + 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); + 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 rep = 0; + int err; + + hpfs_lock(dir->i_sb); + hpfs_adjust_length(name, &len); +again: + 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, try to truncate file */ + + err = -ENOSPC; + if (rep++) + break; + + dentry_unhash(dentry); + if (!d_unhashed(dentry)) { + hpfs_unlock(dir->i_sb); + return -ENOSPC; + } + if (generic_permission(inode, MAY_WRITE) || + !S_ISREG(inode->i_mode) || + get_write_access(inode)) { + d_rehash(dentry); + } else { + struct iattr newattrs; + /*pr_info("truncating file before delete.\n");*/ + newattrs.ia_size = 0; + newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; + err = notify_change(dentry, &newattrs, NULL); + put_write_access(inode); + if (!err) + goto again; + } + hpfs_unlock(dir->i_sb); + return -ENOSPC; + default: + drop_nlink(inode); + err = 0; + } + goto out; + +out1: + hpfs_brelse4(&qbh); +out: + 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: + hpfs_unlock(dir->i_sb); + return err; +} + +static int hpfs_symlink_readpage(struct file *file, struct page *page) +{ + char *link = kmap(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); + kunmap(page); + unlock_page(page); + return 0; + +fail: + hpfs_unlock(i->i_sb); + SetPageError(page); + kunmap(page); + unlock_page(page); + return err; +} + +const struct address_space_operations hpfs_symlink_aops = { + .readpage = hpfs_symlink_readpage +}; + +static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + 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 ((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 = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0; + 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: + 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, +}; |