--- /dev/null
+/*
+ * 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,
+};
Code Review / kvmfornfv.git / blobdiff