f2fs: add inode operations for special inodes

This adds inode operations for directory, symlink, and special inodes.

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
new file mode 100644 (file)
index 0000000..aec362f
--- /dev/null
+++ b/fs/f2fs/namei.c
@@ -0,0 +1,504 @@
+/**
+ * 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 "xattr.h"
+#include "acl.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;
+
+       inode = new_inode(sb);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+
+       mutex_lock_op(sbi, NODE_NEW);
+       if (!alloc_nid(sbi, &ino)) {
+               mutex_unlock_op(sbi, NODE_NEW);
+               err = -ENOSPC;
+               goto fail;
+       }
+       mutex_unlock_op(sbi, NODE_NEW);
+
+       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;
+       }
+
+       mark_inode_dirty(inode);
+       return inode;
+
+out:
+       clear_nlink(inode);
+       unlock_new_inode(inode);
+fail:
+       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)
+{
+       int slen = strlen(s);
+       int sublen = strlen(sub);
+       int ret;
+
+       if (sublen > slen)
+               return 1;
+
+       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_file(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])) {
+                       F2FS_I(inode)->i_advise |= FADVISE_COLD_BIT;
+                       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;
+
+       inode = f2fs_new_inode(dir, mode);
+       if (IS_ERR(inode))
+               return PTR_ERR(inode);
+
+       if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
+               set_cold_file(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;
+
+       err = f2fs_add_link(dentry, inode);
+       if (err)
+               goto out;
+
+       alloc_nid_done(sbi, ino);
+
+       if (!sbi->por_doing)
+               d_instantiate(dentry, inode);
+       unlock_new_inode(inode);
+
+       f2fs_balance_fs(sbi);
+       return 0;
+out:
+       clear_nlink(inode);
+       unlock_new_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;
+
+       inode->i_ctime = CURRENT_TIME;
+       atomic_inc(&inode->i_count);
+
+       set_inode_flag(F2FS_I(inode), FI_INC_LINK);
+       err = f2fs_add_link(dentry, inode);
+       if (err)
+               goto out;
+
+       d_instantiate(dentry, inode);
+
+       f2fs_balance_fs(sbi);
+       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_MAX_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;
+
+       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;
+       }
+
+       f2fs_delete_entry(de, page, inode);
+
+       /* In order to evict this inode,  we set it dirty */
+       mark_inode_dirty(inode);
+       f2fs_balance_fs(sbi);
+fail:
+       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;
+       unsigned symlen = strlen(symname) + 1;
+       int err;
+
+       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;
+
+       err = f2fs_add_link(dentry, inode);
+       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);
+
+       f2fs_balance_fs(sbi);
+
+       return err;
+out:
+       clear_nlink(inode);
+       unlock_new_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;
+
+       inode = f2fs_new_inode(dir, S_IFDIR | mode);
+       err = PTR_ERR(inode);
+       if (IS_ERR(inode))
+               return err;
+
+       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_NOFS | __GFP_ZERO);
+
+       set_inode_flag(F2FS_I(inode), FI_INC_LINK);
+       err = f2fs_add_link(dentry, inode);
+       if (err)
+               goto out_fail;
+
+       alloc_nid_done(sbi, inode->i_ino);
+
+       d_instantiate(dentry, inode);
+       unlock_new_inode(inode);
+
+       f2fs_balance_fs(sbi);
+       return 0;
+
+out_fail:
+       clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
+       clear_nlink(inode);
+       unlock_new_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;
+
+       if (!new_valid_dev(rdev))
+               return -EINVAL;
+
+       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;
+
+       err = f2fs_add_link(dentry, inode);
+       if (err)
+               goto out;
+
+       alloc_nid_done(sbi, inode->i_ino);
+       d_instantiate(dentry, inode);
+       unlock_new_inode(inode);
+
+       f2fs_balance_fs(sbi);
+
+       return 0;
+out:
+       clear_nlink(inode);
+       unlock_new_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;
+
+       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;
+       }
+
+       mutex_lock_op(sbi, RENAME);
+
+       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);
+               f2fs_write_inode(new_inode, NULL);
+       } else {
+               err = f2fs_add_link(new_dentry, old_inode);
+               if (err)
+                       goto out_dir;
+
+               if (old_dir_entry) {
+                       inc_nlink(new_dir);
+                       f2fs_write_inode(new_dir, NULL);
+               }
+       }
+
+       old_inode->i_ctime = CURRENT_TIME;
+       set_inode_flag(F2FS_I(old_inode), FI_NEED_CP);
+       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);
+               f2fs_write_inode(old_dir, NULL);
+       }
+
+       mutex_unlock_op(sbi, RENAME);
+
+       f2fs_balance_fs(sbi);
+       return 0;
+
+out_dir:
+       if (old_dir_entry) {
+               kunmap(old_dir_page);
+               f2fs_put_page(old_dir_page, 0);
+       }
+       mutex_unlock_op(sbi, RENAME);
+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,
+       .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,
+       .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 = {
+       .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
+};