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ext4: rename: create ext4_renament structure for local vars
Need to split up ext4_rename() into helpers but there are too many local variables involved, so create a new structure. This also, apparently, makes the generated code size slightly smaller. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Miklos Szeredi
parent
da1ce0670c
commit
c0d268c366
211
fs/ext4/namei.c
211
fs/ext4/namei.c
@ -3000,6 +3000,22 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
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return ext4_get_first_inline_block(inode, parent_de, retval);
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}
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struct ext4_renament {
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struct inode *dir;
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struct dentry *dentry;
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struct inode *inode;
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/* entry for "dentry" */
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struct buffer_head *bh;
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struct ext4_dir_entry_2 *de;
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int inlined;
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/* entry for ".." in inode if it's a directory */
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struct buffer_head *dir_bh;
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struct ext4_dir_entry_2 *parent_de;
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int dir_inlined;
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};
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/*
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* Anybody can rename anything with this: the permission checks are left to the
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* higher-level routines.
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@ -3012,193 +3028,194 @@ static int ext4_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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handle_t *handle = NULL;
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struct inode *old_inode, *new_inode;
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struct buffer_head *old_bh, *new_bh, *dir_bh;
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struct ext4_dir_entry_2 *old_de, *new_de;
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struct ext4_renament old = {
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.dir = old_dir,
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.dentry = old_dentry,
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.inode = old_dentry->d_inode,
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};
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struct ext4_renament new = {
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.dir = new_dir,
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.dentry = new_dentry,
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.inode = new_dentry->d_inode,
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};
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int retval;
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int inlined = 0, new_inlined = 0;
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struct ext4_dir_entry_2 *parent_de;
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dquot_initialize(old_dir);
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dquot_initialize(new_dir);
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old_bh = new_bh = dir_bh = NULL;
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dquot_initialize(old.dir);
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dquot_initialize(new.dir);
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/* Initialize quotas before so that eventual writes go
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* in separate transaction */
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if (new_dentry->d_inode)
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dquot_initialize(new_dentry->d_inode);
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if (new.inode)
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dquot_initialize(new.inode);
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old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de, NULL);
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old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
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/*
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* Check for inode number is _not_ due to possible IO errors.
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* We might rmdir the source, keep it as pwd of some process
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* and merrily kill the link to whatever was created under the
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* same name. Goodbye sticky bit ;-<
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*/
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old_inode = old_dentry->d_inode;
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retval = -ENOENT;
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if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
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if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
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goto end_rename;
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new_inode = new_dentry->d_inode;
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new_bh = ext4_find_entry(new_dir, &new_dentry->d_name,
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&new_de, &new_inlined);
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if (new_bh) {
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if (!new_inode) {
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brelse(new_bh);
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new_bh = NULL;
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new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
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&new.de, &new.inlined);
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if (new.bh) {
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if (!new.inode) {
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brelse(new.bh);
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new.bh = NULL;
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}
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}
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if (new_inode && !test_opt(new_dir->i_sb, NO_AUTO_DA_ALLOC))
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ext4_alloc_da_blocks(old_inode);
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if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
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ext4_alloc_da_blocks(old.inode);
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handle = ext4_journal_start(old_dir, EXT4_HT_DIR,
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(2 * EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) +
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handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
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(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
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EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
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if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
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ext4_handle_sync(handle);
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if (S_ISDIR(old_inode->i_mode)) {
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if (new_inode) {
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if (S_ISDIR(old.inode->i_mode)) {
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if (new.inode) {
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retval = -ENOTEMPTY;
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if (!empty_dir(new_inode))
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if (!empty_dir(new.inode))
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goto end_rename;
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}
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retval = -EIO;
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dir_bh = ext4_get_first_dir_block(handle, old_inode,
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&retval, &parent_de,
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&inlined);
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if (!dir_bh)
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old.dir_bh = ext4_get_first_dir_block(handle, old.inode,
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&retval, &old.parent_de,
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&old.dir_inlined);
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if (!old.dir_bh)
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goto end_rename;
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if (le32_to_cpu(parent_de->inode) != old_dir->i_ino)
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if (le32_to_cpu(old.parent_de->inode) != old.dir->i_ino)
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goto end_rename;
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retval = -EMLINK;
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if (!new_inode && new_dir != old_dir &&
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EXT4_DIR_LINK_MAX(new_dir))
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if (!new.inode && new.dir != old.dir &&
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EXT4_DIR_LINK_MAX(new.dir))
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goto end_rename;
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BUFFER_TRACE(dir_bh, "get_write_access");
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retval = ext4_journal_get_write_access(handle, dir_bh);
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BUFFER_TRACE(old.dir_bh, "get_write_access");
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retval = ext4_journal_get_write_access(handle, old.dir_bh);
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if (retval)
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goto end_rename;
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}
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if (!new_bh) {
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retval = ext4_add_entry(handle, new_dentry, old_inode);
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if (!new.bh) {
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retval = ext4_add_entry(handle, new.dentry, old.inode);
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if (retval)
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goto end_rename;
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} else {
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BUFFER_TRACE(new_bh, "get write access");
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retval = ext4_journal_get_write_access(handle, new_bh);
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BUFFER_TRACE(new.bh, "get write access");
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retval = ext4_journal_get_write_access(handle, new.bh);
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if (retval)
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goto end_rename;
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new_de->inode = cpu_to_le32(old_inode->i_ino);
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if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
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new.de->inode = cpu_to_le32(old.inode->i_ino);
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if (EXT4_HAS_INCOMPAT_FEATURE(new.dir->i_sb,
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EXT4_FEATURE_INCOMPAT_FILETYPE))
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new_de->file_type = old_de->file_type;
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new_dir->i_version++;
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new_dir->i_ctime = new_dir->i_mtime =
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ext4_current_time(new_dir);
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ext4_mark_inode_dirty(handle, new_dir);
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BUFFER_TRACE(new_bh, "call ext4_handle_dirty_metadata");
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if (!new_inlined) {
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new.de->file_type = old.de->file_type;
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new.dir->i_version++;
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new.dir->i_ctime = new.dir->i_mtime =
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ext4_current_time(new.dir);
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ext4_mark_inode_dirty(handle, new.dir);
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BUFFER_TRACE(new.bh, "call ext4_handle_dirty_metadata");
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if (!new.inlined) {
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retval = ext4_handle_dirty_dirent_node(handle,
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new_dir, new_bh);
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new.dir, new.bh);
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if (unlikely(retval)) {
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ext4_std_error(new_dir->i_sb, retval);
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ext4_std_error(new.dir->i_sb, retval);
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goto end_rename;
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}
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}
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brelse(new_bh);
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new_bh = NULL;
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brelse(new.bh);
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new.bh = NULL;
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}
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/*
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* Like most other Unix systems, set the ctime for inodes on a
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* rename.
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*/
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old_inode->i_ctime = ext4_current_time(old_inode);
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ext4_mark_inode_dirty(handle, old_inode);
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old.inode->i_ctime = ext4_current_time(old.inode);
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ext4_mark_inode_dirty(handle, old.inode);
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/*
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* ok, that's it
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*/
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if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
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old_de->name_len != old_dentry->d_name.len ||
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strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
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(retval = ext4_delete_entry(handle, old_dir,
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old_de, old_bh)) == -ENOENT) {
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/* old_de could have moved from under us during htree split, so
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if (le32_to_cpu(old.de->inode) != old.inode->i_ino ||
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old.de->name_len != old.dentry->d_name.len ||
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strncmp(old.de->name, old.dentry->d_name.name, old.de->name_len) ||
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(retval = ext4_delete_entry(handle, old.dir,
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old.de, old.bh)) == -ENOENT) {
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/* old.de could have moved from under us during htree split, so
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* make sure that we are deleting the right entry. We might
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* also be pointing to a stale entry in the unused part of
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* old_bh so just checking inum and the name isn't enough. */
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* old.bh so just checking inum and the name isn't enough. */
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struct buffer_head *old_bh2;
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struct ext4_dir_entry_2 *old_de2;
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old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name,
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old_bh2 = ext4_find_entry(old.dir, &old.dentry->d_name,
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&old_de2, NULL);
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if (old_bh2) {
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retval = ext4_delete_entry(handle, old_dir,
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retval = ext4_delete_entry(handle, old.dir,
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old_de2, old_bh2);
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brelse(old_bh2);
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}
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}
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if (retval) {
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ext4_warning(old_dir->i_sb,
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ext4_warning(old.dir->i_sb,
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"Deleting old file (%lu), %d, error=%d",
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old_dir->i_ino, old_dir->i_nlink, retval);
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old.dir->i_ino, old.dir->i_nlink, retval);
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}
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if (new_inode) {
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ext4_dec_count(handle, new_inode);
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new_inode->i_ctime = ext4_current_time(new_inode);
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if (new.inode) {
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ext4_dec_count(handle, new.inode);
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new.inode->i_ctime = ext4_current_time(new.inode);
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}
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old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
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ext4_update_dx_flag(old_dir);
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if (dir_bh) {
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parent_de->inode = cpu_to_le32(new_dir->i_ino);
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BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
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if (!inlined) {
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if (is_dx(old_inode)) {
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old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir);
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ext4_update_dx_flag(old.dir);
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if (old.dir_bh) {
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old.parent_de->inode = cpu_to_le32(new.dir->i_ino);
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BUFFER_TRACE(old.dir_bh, "call ext4_handle_dirty_metadata");
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if (!old.dir_inlined) {
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if (is_dx(old.inode)) {
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retval = ext4_handle_dirty_dx_node(handle,
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old_inode,
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dir_bh);
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old.inode,
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old.dir_bh);
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} else {
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retval = ext4_handle_dirty_dirent_node(handle,
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old_inode, dir_bh);
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old.inode, old.dir_bh);
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}
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} else {
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retval = ext4_mark_inode_dirty(handle, old_inode);
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retval = ext4_mark_inode_dirty(handle, old.inode);
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}
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if (retval) {
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ext4_std_error(old_dir->i_sb, retval);
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ext4_std_error(old.dir->i_sb, retval);
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goto end_rename;
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}
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ext4_dec_count(handle, old_dir);
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if (new_inode) {
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ext4_dec_count(handle, old.dir);
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if (new.inode) {
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/* checked empty_dir above, can't have another parent,
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* ext4_dec_count() won't work for many-linked dirs */
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clear_nlink(new_inode);
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clear_nlink(new.inode);
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} else {
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ext4_inc_count(handle, new_dir);
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ext4_update_dx_flag(new_dir);
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ext4_mark_inode_dirty(handle, new_dir);
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ext4_inc_count(handle, new.dir);
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ext4_update_dx_flag(new.dir);
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ext4_mark_inode_dirty(handle, new.dir);
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}
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}
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ext4_mark_inode_dirty(handle, old_dir);
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if (new_inode) {
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ext4_mark_inode_dirty(handle, new_inode);
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if (!new_inode->i_nlink)
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ext4_orphan_add(handle, new_inode);
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ext4_mark_inode_dirty(handle, old.dir);
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if (new.inode) {
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ext4_mark_inode_dirty(handle, new.inode);
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if (!new.inode->i_nlink)
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ext4_orphan_add(handle, new.inode);
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}
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retval = 0;
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end_rename:
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brelse(dir_bh);
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brelse(old_bh);
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brelse(new_bh);
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brelse(old.dir_bh);
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brelse(old.bh);
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brelse(new.bh);
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if (handle)
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ext4_journal_stop(handle);
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return retval;
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