| /* |
| * fs/f2fs/namei.c |
| * |
| * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com/ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/fs.h> |
| #include <linux/f2fs_fs.h> |
| #include <linux/pagemap.h> |
| #include <linux/sched.h> |
| #include <linux/ctype.h> |
| |
| #include "f2fs.h" |
| #include "node.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include <trace/events/f2fs.h> |
| |
| static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| nid_t ino; |
| struct inode *inode; |
| bool nid_free = false; |
| int err, ilock; |
| |
| inode = new_inode(sb); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| |
| ilock = mutex_lock_op(sbi); |
| if (!alloc_nid(sbi, &ino)) { |
| mutex_unlock_op(sbi, ilock); |
| err = -ENOSPC; |
| goto fail; |
| } |
| mutex_unlock_op(sbi, ilock); |
| |
| inode->i_uid = current_fsuid(); |
| |
| if (dir->i_mode & S_ISGID) { |
| inode->i_gid = dir->i_gid; |
| if (S_ISDIR(mode)) |
| mode |= S_ISGID; |
| } else { |
| inode->i_gid = current_fsgid(); |
| } |
| |
| inode->i_ino = ino; |
| inode->i_mode = mode; |
| inode->i_blocks = 0; |
| inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| inode->i_generation = sbi->s_next_generation++; |
| |
| err = insert_inode_locked(inode); |
| if (err) { |
| err = -EINVAL; |
| nid_free = true; |
| goto out; |
| } |
| trace_f2fs_new_inode(inode, 0); |
| mark_inode_dirty(inode); |
| return inode; |
| |
| out: |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| fail: |
| trace_f2fs_new_inode(inode, err); |
| make_bad_inode(inode); |
| iput(inode); |
| if (nid_free) |
| alloc_nid_failed(sbi, ino); |
| return ERR_PTR(err); |
| } |
| |
| static int is_multimedia_file(const unsigned char *s, const char *sub) |
| { |
| size_t slen = strlen(s); |
| size_t sublen = strlen(sub); |
| int ret; |
| |
| if (sublen > slen) |
| return 0; |
| |
| ret = memcmp(s + slen - sublen, sub, sublen); |
| if (ret) { /* compare upper case */ |
| int i; |
| char upper_sub[8]; |
| for (i = 0; i < sublen && i < sizeof(upper_sub); i++) |
| upper_sub[i] = toupper(sub[i]); |
| return !memcmp(s + slen - sublen, upper_sub, sublen); |
| } |
| |
| return !ret; |
| } |
| |
| /* |
| * Set multimedia files as cold files for hot/cold data separation |
| */ |
| static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, |
| const unsigned char *name) |
| { |
| int i; |
| __u8 (*extlist)[8] = sbi->raw_super->extension_list; |
| |
| int count = le32_to_cpu(sbi->raw_super->extension_count); |
| for (i = 0; i < count; i++) { |
| if (is_multimedia_file(name, extlist[i])) { |
| file_set_cold(inode); |
| break; |
| } |
| } |
| } |
| |
| static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *inode; |
| nid_t ino = 0; |
| int err, ilock; |
| |
| f2fs_balance_fs(sbi); |
| |
| inode = f2fs_new_inode(dir, mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) |
| set_cold_files(sbi, inode, dentry->d_name.name); |
| |
| inode->i_op = &f2fs_file_inode_operations; |
| inode->i_fop = &f2fs_file_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| ino = inode->i_ino; |
| |
| ilock = mutex_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| mutex_unlock_op(sbi, ilock); |
| if (err) |
| goto out; |
| |
| alloc_nid_done(sbi, ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| return 0; |
| out: |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| make_bad_inode(inode); |
| iput(inode); |
| alloc_nid_failed(sbi, ino); |
| return err; |
| } |
| |
| static int f2fs_link(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| struct inode *inode = old_dentry->d_inode; |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| int err, ilock; |
| |
| f2fs_balance_fs(sbi); |
| |
| inode->i_ctime = CURRENT_TIME; |
| ihold(inode); |
| |
| set_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| ilock = mutex_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| mutex_unlock_op(sbi, ilock); |
| if (err) |
| goto out; |
| |
| d_instantiate(dentry, inode); |
| return 0; |
| out: |
| clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| iput(inode); |
| return err; |
| } |
| |
| struct dentry *f2fs_get_parent(struct dentry *child) |
| { |
| struct qstr dotdot = QSTR_INIT("..", 2); |
| unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot); |
| if (!ino) |
| return ERR_PTR(-ENOENT); |
| return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino)); |
| } |
| |
| static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct inode *inode = NULL; |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| |
| if (dentry->d_name.len > F2FS_NAME_LEN) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| if (de) { |
| nid_t ino = le32_to_cpu(de->ino); |
| kunmap(page); |
| f2fs_put_page(page, 0); |
| |
| inode = f2fs_iget(dir->i_sb, ino); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| } |
| |
| return d_splice_alias(inode, dentry); |
| } |
| |
| static int f2fs_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *inode = dentry->d_inode; |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| int err = -ENOENT; |
| int ilock; |
| |
| trace_f2fs_unlink_enter(dir, dentry); |
| f2fs_balance_fs(sbi); |
| |
| de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| if (!de) |
| goto fail; |
| |
| err = check_orphan_space(sbi); |
| if (err) { |
| kunmap(page); |
| f2fs_put_page(page, 0); |
| goto fail; |
| } |
| |
| ilock = mutex_lock_op(sbi); |
| f2fs_delete_entry(de, page, inode); |
| mutex_unlock_op(sbi, ilock); |
| |
| /* In order to evict this inode, we set it dirty */ |
| mark_inode_dirty(inode); |
| fail: |
| trace_f2fs_unlink_exit(inode, err); |
| return err; |
| } |
| |
| static int f2fs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *symname) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *inode; |
| size_t symlen = strlen(symname) + 1; |
| int err, ilock; |
| |
| f2fs_balance_fs(sbi); |
| |
| inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| inode->i_op = &f2fs_symlink_inode_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| |
| ilock = mutex_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| mutex_unlock_op(sbi, ilock); |
| if (err) |
| goto out; |
| |
| err = page_symlink(inode, symname, symlen); |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| return err; |
| out: |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| make_bad_inode(inode); |
| iput(inode); |
| alloc_nid_failed(sbi, inode->i_ino); |
| return err; |
| } |
| |
| static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
| struct inode *inode; |
| int err, ilock; |
| |
| f2fs_balance_fs(sbi); |
| |
| inode = f2fs_new_inode(dir, S_IFDIR | mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| inode->i_op = &f2fs_dir_inode_operations; |
| inode->i_fop = &f2fs_dir_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); |
| |
| set_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| ilock = mutex_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| mutex_unlock_op(sbi, ilock); |
| if (err) |
| goto out_fail; |
| |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| |
| return 0; |
| |
| out_fail: |
| clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| make_bad_inode(inode); |
| iput(inode); |
| alloc_nid_failed(sbi, inode->i_ino); |
| return err; |
| } |
| |
| static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| struct inode *inode = dentry->d_inode; |
| if (f2fs_empty_dir(inode)) |
| return f2fs_unlink(dir, dentry); |
| return -ENOTEMPTY; |
| } |
| |
| static int f2fs_mknod(struct inode *dir, struct dentry *dentry, |
| umode_t mode, dev_t rdev) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *inode; |
| int err = 0; |
| int ilock; |
| |
| if (!new_valid_dev(rdev)) |
| return -EINVAL; |
| |
| f2fs_balance_fs(sbi); |
| |
| inode = f2fs_new_inode(dir, mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| init_special_inode(inode, inode->i_mode, rdev); |
| inode->i_op = &f2fs_special_inode_operations; |
| |
| ilock = mutex_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| mutex_unlock_op(sbi, ilock); |
| if (err) |
| goto out; |
| |
| alloc_nid_done(sbi, inode->i_ino); |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| return 0; |
| out: |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| make_bad_inode(inode); |
| iput(inode); |
| alloc_nid_failed(sbi, inode->i_ino); |
| return err; |
| } |
| |
| static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry) |
| { |
| struct super_block *sb = old_dir->i_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *old_inode = old_dentry->d_inode; |
| struct inode *new_inode = new_dentry->d_inode; |
| struct page *old_dir_page; |
| struct page *old_page; |
| struct f2fs_dir_entry *old_dir_entry = NULL; |
| struct f2fs_dir_entry *old_entry; |
| struct f2fs_dir_entry *new_entry; |
| int err = -ENOENT, ilock = -1; |
| |
| f2fs_balance_fs(sbi); |
| |
| old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
| if (!old_entry) |
| goto out; |
| |
| if (S_ISDIR(old_inode->i_mode)) { |
| err = -EIO; |
| old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); |
| if (!old_dir_entry) |
| goto out_old; |
| } |
| |
| ilock = mutex_lock_op(sbi); |
| |
| if (new_inode) { |
| struct page *new_page; |
| |
| err = -ENOTEMPTY; |
| if (old_dir_entry && !f2fs_empty_dir(new_inode)) |
| goto out_dir; |
| |
| err = -ENOENT; |
| new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, |
| &new_page); |
| if (!new_entry) |
| goto out_dir; |
| |
| f2fs_set_link(new_dir, new_entry, new_page, old_inode); |
| |
| new_inode->i_ctime = CURRENT_TIME; |
| if (old_dir_entry) |
| drop_nlink(new_inode); |
| drop_nlink(new_inode); |
| if (!new_inode->i_nlink) |
| add_orphan_inode(sbi, new_inode->i_ino); |
| update_inode_page(new_inode); |
| } else { |
| err = f2fs_add_link(new_dentry, old_inode); |
| if (err) |
| goto out_dir; |
| |
| if (old_dir_entry) { |
| inc_nlink(new_dir); |
| update_inode_page(new_dir); |
| } |
| } |
| |
| old_inode->i_ctime = CURRENT_TIME; |
| mark_inode_dirty(old_inode); |
| |
| f2fs_delete_entry(old_entry, old_page, NULL); |
| |
| if (old_dir_entry) { |
| if (old_dir != new_dir) { |
| f2fs_set_link(old_inode, old_dir_entry, |
| old_dir_page, new_dir); |
| } else { |
| kunmap(old_dir_page); |
| f2fs_put_page(old_dir_page, 0); |
| } |
| drop_nlink(old_dir); |
| update_inode_page(old_dir); |
| } |
| |
| mutex_unlock_op(sbi, ilock); |
| return 0; |
| |
| out_dir: |
| if (old_dir_entry) { |
| kunmap(old_dir_page); |
| f2fs_put_page(old_dir_page, 0); |
| } |
| mutex_unlock_op(sbi, ilock); |
| out_old: |
| kunmap(old_page); |
| f2fs_put_page(old_page, 0); |
| out: |
| return err; |
| } |
| |
| const struct inode_operations f2fs_dir_inode_operations = { |
| .create = f2fs_create, |
| .lookup = f2fs_lookup, |
| .link = f2fs_link, |
| .unlink = f2fs_unlink, |
| .symlink = f2fs_symlink, |
| .mkdir = f2fs_mkdir, |
| .rmdir = f2fs_rmdir, |
| .mknod = f2fs_mknod, |
| .rename = f2fs_rename, |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| .get_acl = f2fs_get_acl, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .listxattr = f2fs_listxattr, |
| .removexattr = generic_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations f2fs_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .follow_link = page_follow_link_light, |
| .put_link = page_put_link, |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .listxattr = f2fs_listxattr, |
| .removexattr = generic_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations f2fs_special_inode_operations = { |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| .get_acl = f2fs_get_acl, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .listxattr = f2fs_listxattr, |
| .removexattr = generic_removexattr, |
| #endif |
| }; |