mirror of https://gitee.com/openkylin/linux.git
532 lines
12 KiB
C
532 lines
12 KiB
C
/*
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* fs/f2fs/namei.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <linux/ctype.h>
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#include "f2fs.h"
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#include "node.h"
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#include "xattr.h"
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#include "acl.h"
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#include <trace/events/f2fs.h>
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static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
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{
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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nid_t ino;
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struct inode *inode;
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bool nid_free = false;
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int err;
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inode = new_inode(sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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f2fs_lock_op(sbi);
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if (!alloc_nid(sbi, &ino)) {
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f2fs_unlock_op(sbi);
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err = -ENOSPC;
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goto fail;
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}
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f2fs_unlock_op(sbi);
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inode->i_uid = current_fsuid();
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if (dir->i_mode & S_ISGID) {
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inode->i_gid = dir->i_gid;
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if (S_ISDIR(mode))
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mode |= S_ISGID;
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} else {
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inode->i_gid = current_fsgid();
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}
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inode->i_ino = ino;
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inode->i_mode = mode;
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inode->i_blocks = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_generation = sbi->s_next_generation++;
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err = insert_inode_locked(inode);
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if (err) {
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err = -EINVAL;
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nid_free = true;
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goto out;
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}
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trace_f2fs_new_inode(inode, 0);
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mark_inode_dirty(inode);
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return inode;
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out:
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clear_nlink(inode);
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unlock_new_inode(inode);
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fail:
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trace_f2fs_new_inode(inode, err);
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make_bad_inode(inode);
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iput(inode);
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if (nid_free)
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alloc_nid_failed(sbi, ino);
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return ERR_PTR(err);
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}
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static int is_multimedia_file(const unsigned char *s, const char *sub)
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{
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size_t slen = strlen(s);
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size_t sublen = strlen(sub);
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if (sublen > slen)
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return 0;
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return !strncasecmp(s + slen - sublen, sub, sublen);
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}
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/*
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* Set multimedia files as cold files for hot/cold data separation
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*/
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static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
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const unsigned char *name)
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{
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int i;
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__u8 (*extlist)[8] = sbi->raw_super->extension_list;
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int count = le32_to_cpu(sbi->raw_super->extension_count);
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for (i = 0; i < count; i++) {
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if (is_multimedia_file(name, extlist[i])) {
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file_set_cold(inode);
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break;
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}
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}
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}
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static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl)
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{
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *inode;
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nid_t ino = 0;
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int err;
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f2fs_balance_fs(sbi);
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inode = f2fs_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
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set_cold_files(sbi, inode, dentry->d_name.name);
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inode->i_op = &f2fs_file_inode_operations;
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inode->i_fop = &f2fs_file_operations;
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inode->i_mapping->a_ops = &f2fs_dblock_aops;
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ino = inode->i_ino;
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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f2fs_unlock_op(sbi);
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if (err)
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goto out;
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alloc_nid_done(sbi, ino);
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d_instantiate(dentry, inode);
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unlock_new_inode(inode);
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return 0;
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out:
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clear_nlink(inode);
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unlock_new_inode(inode);
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make_bad_inode(inode);
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iput(inode);
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alloc_nid_failed(sbi, ino);
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return err;
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}
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static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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struct inode *inode = old_dentry->d_inode;
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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int err;
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f2fs_balance_fs(sbi);
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inode->i_ctime = CURRENT_TIME;
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ihold(inode);
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set_inode_flag(F2FS_I(inode), FI_INC_LINK);
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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f2fs_unlock_op(sbi);
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if (err)
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goto out;
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d_instantiate(dentry, inode);
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return 0;
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out:
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clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
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iput(inode);
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return err;
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}
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struct dentry *f2fs_get_parent(struct dentry *child)
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{
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struct qstr dotdot = QSTR_INIT("..", 2);
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unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
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if (!ino)
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return ERR_PTR(-ENOENT);
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return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
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}
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static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct inode *inode = NULL;
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struct f2fs_dir_entry *de;
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struct page *page;
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if (dentry->d_name.len > F2FS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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de = f2fs_find_entry(dir, &dentry->d_name, &page);
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if (de) {
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nid_t ino = le32_to_cpu(de->ino);
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kunmap(page);
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f2fs_put_page(page, 0);
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inode = f2fs_iget(dir->i_sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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}
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return d_splice_alias(inode, dentry);
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}
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static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *inode = dentry->d_inode;
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struct f2fs_dir_entry *de;
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struct page *page;
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int err = -ENOENT;
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trace_f2fs_unlink_enter(dir, dentry);
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f2fs_balance_fs(sbi);
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de = f2fs_find_entry(dir, &dentry->d_name, &page);
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if (!de)
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goto fail;
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f2fs_lock_op(sbi);
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err = acquire_orphan_inode(sbi);
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if (err) {
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f2fs_unlock_op(sbi);
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kunmap(page);
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f2fs_put_page(page, 0);
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goto fail;
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}
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f2fs_delete_entry(de, page, inode);
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f2fs_unlock_op(sbi);
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/* In order to evict this inode, we set it dirty */
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mark_inode_dirty(inode);
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fail:
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trace_f2fs_unlink_exit(inode, err);
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return err;
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}
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static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *inode;
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size_t symlen = strlen(symname) + 1;
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int err;
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f2fs_balance_fs(sbi);
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inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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inode->i_op = &f2fs_symlink_inode_operations;
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inode->i_mapping->a_ops = &f2fs_dblock_aops;
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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f2fs_unlock_op(sbi);
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if (err)
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goto out;
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err = page_symlink(inode, symname, symlen);
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alloc_nid_done(sbi, inode->i_ino);
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d_instantiate(dentry, inode);
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unlock_new_inode(inode);
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return err;
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out:
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clear_nlink(inode);
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unlock_new_inode(inode);
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make_bad_inode(inode);
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iput(inode);
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alloc_nid_failed(sbi, inode->i_ino);
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return err;
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}
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static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
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struct inode *inode;
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int err;
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f2fs_balance_fs(sbi);
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inode = f2fs_new_inode(dir, S_IFDIR | mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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inode->i_op = &f2fs_dir_inode_operations;
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inode->i_fop = &f2fs_dir_operations;
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inode->i_mapping->a_ops = &f2fs_dblock_aops;
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mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
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set_inode_flag(F2FS_I(inode), FI_INC_LINK);
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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f2fs_unlock_op(sbi);
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if (err)
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goto out_fail;
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alloc_nid_done(sbi, inode->i_ino);
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d_instantiate(dentry, inode);
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unlock_new_inode(inode);
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return 0;
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out_fail:
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clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
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clear_nlink(inode);
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unlock_new_inode(inode);
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make_bad_inode(inode);
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iput(inode);
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alloc_nid_failed(sbi, inode->i_ino);
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return err;
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}
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static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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if (f2fs_empty_dir(inode))
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return f2fs_unlink(dir, dentry);
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return -ENOTEMPTY;
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}
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static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
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umode_t mode, dev_t rdev)
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{
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struct super_block *sb = dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *inode;
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int err = 0;
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if (!new_valid_dev(rdev))
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return -EINVAL;
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f2fs_balance_fs(sbi);
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inode = f2fs_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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init_special_inode(inode, inode->i_mode, rdev);
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inode->i_op = &f2fs_special_inode_operations;
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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f2fs_unlock_op(sbi);
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if (err)
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goto out;
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alloc_nid_done(sbi, inode->i_ino);
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d_instantiate(dentry, inode);
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unlock_new_inode(inode);
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return 0;
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out:
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clear_nlink(inode);
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unlock_new_inode(inode);
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make_bad_inode(inode);
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iput(inode);
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alloc_nid_failed(sbi, inode->i_ino);
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return err;
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}
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static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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struct super_block *sb = old_dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *old_inode = old_dentry->d_inode;
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struct inode *new_inode = new_dentry->d_inode;
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struct page *old_dir_page;
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struct page *old_page, *new_page;
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struct f2fs_dir_entry *old_dir_entry = NULL;
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struct f2fs_dir_entry *old_entry;
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struct f2fs_dir_entry *new_entry;
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int err = -ENOENT;
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f2fs_balance_fs(sbi);
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old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
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if (!old_entry)
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goto out;
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if (S_ISDIR(old_inode->i_mode)) {
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err = -EIO;
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old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
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if (!old_dir_entry)
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goto out_old;
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}
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f2fs_lock_op(sbi);
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if (new_inode) {
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err = -ENOTEMPTY;
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if (old_dir_entry && !f2fs_empty_dir(new_inode))
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goto out_dir;
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err = -ENOENT;
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new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
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&new_page);
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if (!new_entry)
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goto out_dir;
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err = acquire_orphan_inode(sbi);
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if (err)
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goto put_out_dir;
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if (update_dent_inode(old_inode, &new_dentry->d_name)) {
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release_orphan_inode(sbi);
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goto put_out_dir;
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}
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f2fs_set_link(new_dir, new_entry, new_page, old_inode);
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new_inode->i_ctime = CURRENT_TIME;
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if (old_dir_entry)
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drop_nlink(new_inode);
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drop_nlink(new_inode);
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if (!new_inode->i_nlink)
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add_orphan_inode(sbi, new_inode->i_ino);
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else
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release_orphan_inode(sbi);
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update_inode_page(old_inode);
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update_inode_page(new_inode);
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} else {
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err = f2fs_add_link(new_dentry, old_inode);
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if (err)
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goto out_dir;
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if (old_dir_entry) {
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inc_nlink(new_dir);
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update_inode_page(new_dir);
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}
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}
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old_inode->i_ctime = CURRENT_TIME;
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mark_inode_dirty(old_inode);
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f2fs_delete_entry(old_entry, old_page, NULL);
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if (old_dir_entry) {
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if (old_dir != new_dir) {
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f2fs_set_link(old_inode, old_dir_entry,
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old_dir_page, new_dir);
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} else {
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kunmap(old_dir_page);
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f2fs_put_page(old_dir_page, 0);
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}
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drop_nlink(old_dir);
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update_inode_page(old_dir);
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}
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f2fs_unlock_op(sbi);
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return 0;
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put_out_dir:
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f2fs_put_page(new_page, 1);
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out_dir:
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if (old_dir_entry) {
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kunmap(old_dir_page);
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f2fs_put_page(old_dir_page, 0);
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}
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f2fs_unlock_op(sbi);
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out_old:
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kunmap(old_page);
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f2fs_put_page(old_page, 0);
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out:
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return err;
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}
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const struct inode_operations f2fs_dir_inode_operations = {
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.create = f2fs_create,
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.lookup = f2fs_lookup,
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.link = f2fs_link,
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.unlink = f2fs_unlink,
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.symlink = f2fs_symlink,
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.mkdir = f2fs_mkdir,
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.rmdir = f2fs_rmdir,
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.mknod = f2fs_mknod,
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.rename = f2fs_rename,
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.getattr = f2fs_getattr,
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.setattr = f2fs_setattr,
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.get_acl = f2fs_get_acl,
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#ifdef CONFIG_F2FS_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = f2fs_listxattr,
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.removexattr = generic_removexattr,
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#endif
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};
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const struct inode_operations f2fs_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.getattr = f2fs_getattr,
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.setattr = f2fs_setattr,
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#ifdef CONFIG_F2FS_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.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
|
|
};
|