From c0d268c3661efdfc76dde90ff2bc12806410cd0a Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 1 Apr 2014 17:08:43 +0200 Subject: [PATCH] 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 Reviewed-by: Jan Kara --- fs/ext4/namei.c | 211 ++++++++++++++++++++++++++---------------------- 1 file changed, 114 insertions(+), 97 deletions(-) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 5f19171b3e1f..7193cea805ff 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -3000,6 +3000,22 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, return ext4_get_first_inline_block(inode, parent_de, retval); } +struct ext4_renament { + struct inode *dir; + struct dentry *dentry; + struct inode *inode; + + /* entry for "dentry" */ + struct buffer_head *bh; + struct ext4_dir_entry_2 *de; + int inlined; + + /* entry for ".." in inode if it's a directory */ + struct buffer_head *dir_bh; + struct ext4_dir_entry_2 *parent_de; + int dir_inlined; +}; + /* * Anybody can rename anything with this: the permission checks are left to the * higher-level routines. @@ -3012,193 +3028,194 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { handle_t *handle = NULL; - struct inode *old_inode, *new_inode; - struct buffer_head *old_bh, *new_bh, *dir_bh; - struct ext4_dir_entry_2 *old_de, *new_de; + struct ext4_renament old = { + .dir = old_dir, + .dentry = old_dentry, + .inode = old_dentry->d_inode, + }; + struct ext4_renament new = { + .dir = new_dir, + .dentry = new_dentry, + .inode = new_dentry->d_inode, + }; int retval; - int inlined = 0, new_inlined = 0; - struct ext4_dir_entry_2 *parent_de; - - dquot_initialize(old_dir); - dquot_initialize(new_dir); - old_bh = new_bh = dir_bh = NULL; + dquot_initialize(old.dir); + dquot_initialize(new.dir); /* Initialize quotas before so that eventual writes go * in separate transaction */ - if (new_dentry->d_inode) - dquot_initialize(new_dentry->d_inode); + if (new.inode) + dquot_initialize(new.inode); - old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de, NULL); + old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL); /* * Check for inode number is _not_ due to possible IO errors. * We might rmdir the source, keep it as pwd of some process * and merrily kill the link to whatever was created under the * same name. Goodbye sticky bit ;-< */ - old_inode = old_dentry->d_inode; retval = -ENOENT; - if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino) + if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) goto end_rename; - new_inode = new_dentry->d_inode; - new_bh = ext4_find_entry(new_dir, &new_dentry->d_name, - &new_de, &new_inlined); - if (new_bh) { - if (!new_inode) { - brelse(new_bh); - new_bh = NULL; + new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, + &new.de, &new.inlined); + if (new.bh) { + if (!new.inode) { + brelse(new.bh); + new.bh = NULL; } } - if (new_inode && !test_opt(new_dir->i_sb, NO_AUTO_DA_ALLOC)) - ext4_alloc_da_blocks(old_inode); + if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) + ext4_alloc_da_blocks(old.inode); - handle = ext4_journal_start(old_dir, EXT4_HT_DIR, - (2 * EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) + + handle = ext4_journal_start(old.dir, EXT4_HT_DIR, + (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); if (IS_ERR(handle)) return PTR_ERR(handle); - if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) + if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) ext4_handle_sync(handle); - if (S_ISDIR(old_inode->i_mode)) { - if (new_inode) { + if (S_ISDIR(old.inode->i_mode)) { + if (new.inode) { retval = -ENOTEMPTY; - if (!empty_dir(new_inode)) + if (!empty_dir(new.inode)) goto end_rename; } retval = -EIO; - dir_bh = ext4_get_first_dir_block(handle, old_inode, - &retval, &parent_de, - &inlined); - if (!dir_bh) + old.dir_bh = ext4_get_first_dir_block(handle, old.inode, + &retval, &old.parent_de, + &old.dir_inlined); + if (!old.dir_bh) goto end_rename; - if (le32_to_cpu(parent_de->inode) != old_dir->i_ino) + if (le32_to_cpu(old.parent_de->inode) != old.dir->i_ino) goto end_rename; retval = -EMLINK; - if (!new_inode && new_dir != old_dir && - EXT4_DIR_LINK_MAX(new_dir)) + if (!new.inode && new.dir != old.dir && + EXT4_DIR_LINK_MAX(new.dir)) goto end_rename; - BUFFER_TRACE(dir_bh, "get_write_access"); - retval = ext4_journal_get_write_access(handle, dir_bh); + BUFFER_TRACE(old.dir_bh, "get_write_access"); + retval = ext4_journal_get_write_access(handle, old.dir_bh); if (retval) goto end_rename; } - if (!new_bh) { - retval = ext4_add_entry(handle, new_dentry, old_inode); + if (!new.bh) { + retval = ext4_add_entry(handle, new.dentry, old.inode); if (retval) goto end_rename; } else { - BUFFER_TRACE(new_bh, "get write access"); - retval = ext4_journal_get_write_access(handle, new_bh); + BUFFER_TRACE(new.bh, "get write access"); + retval = ext4_journal_get_write_access(handle, new.bh); if (retval) goto end_rename; - new_de->inode = cpu_to_le32(old_inode->i_ino); - if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb, + new.de->inode = cpu_to_le32(old.inode->i_ino); + if (EXT4_HAS_INCOMPAT_FEATURE(new.dir->i_sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) - new_de->file_type = old_de->file_type; - new_dir->i_version++; - new_dir->i_ctime = new_dir->i_mtime = - ext4_current_time(new_dir); - ext4_mark_inode_dirty(handle, new_dir); - BUFFER_TRACE(new_bh, "call ext4_handle_dirty_metadata"); - if (!new_inlined) { + new.de->file_type = old.de->file_type; + new.dir->i_version++; + new.dir->i_ctime = new.dir->i_mtime = + ext4_current_time(new.dir); + ext4_mark_inode_dirty(handle, new.dir); + BUFFER_TRACE(new.bh, "call ext4_handle_dirty_metadata"); + if (!new.inlined) { retval = ext4_handle_dirty_dirent_node(handle, - new_dir, new_bh); + new.dir, new.bh); if (unlikely(retval)) { - ext4_std_error(new_dir->i_sb, retval); + ext4_std_error(new.dir->i_sb, retval); goto end_rename; } } - brelse(new_bh); - new_bh = NULL; + brelse(new.bh); + new.bh = NULL; } /* * Like most other Unix systems, set the ctime for inodes on a * rename. */ - old_inode->i_ctime = ext4_current_time(old_inode); - ext4_mark_inode_dirty(handle, old_inode); + old.inode->i_ctime = ext4_current_time(old.inode); + ext4_mark_inode_dirty(handle, old.inode); /* * ok, that's it */ - if (le32_to_cpu(old_de->inode) != old_inode->i_ino || - old_de->name_len != old_dentry->d_name.len || - strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) || - (retval = ext4_delete_entry(handle, old_dir, - old_de, old_bh)) == -ENOENT) { - /* old_de could have moved from under us during htree split, so + if (le32_to_cpu(old.de->inode) != old.inode->i_ino || + old.de->name_len != old.dentry->d_name.len || + strncmp(old.de->name, old.dentry->d_name.name, old.de->name_len) || + (retval = ext4_delete_entry(handle, old.dir, + old.de, old.bh)) == -ENOENT) { + /* old.de could have moved from under us during htree split, so * make sure that we are deleting the right entry. We might * also be pointing to a stale entry in the unused part of - * old_bh so just checking inum and the name isn't enough. */ + * old.bh so just checking inum and the name isn't enough. */ struct buffer_head *old_bh2; struct ext4_dir_entry_2 *old_de2; - old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name, + old_bh2 = ext4_find_entry(old.dir, &old.dentry->d_name, &old_de2, NULL); if (old_bh2) { - retval = ext4_delete_entry(handle, old_dir, + retval = ext4_delete_entry(handle, old.dir, old_de2, old_bh2); brelse(old_bh2); } } if (retval) { - ext4_warning(old_dir->i_sb, + ext4_warning(old.dir->i_sb, "Deleting old file (%lu), %d, error=%d", - old_dir->i_ino, old_dir->i_nlink, retval); + old.dir->i_ino, old.dir->i_nlink, retval); } - if (new_inode) { - ext4_dec_count(handle, new_inode); - new_inode->i_ctime = ext4_current_time(new_inode); + if (new.inode) { + ext4_dec_count(handle, new.inode); + new.inode->i_ctime = ext4_current_time(new.inode); } - old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir); - ext4_update_dx_flag(old_dir); - if (dir_bh) { - parent_de->inode = cpu_to_le32(new_dir->i_ino); - BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata"); - if (!inlined) { - if (is_dx(old_inode)) { + old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir); + ext4_update_dx_flag(old.dir); + if (old.dir_bh) { + old.parent_de->inode = cpu_to_le32(new.dir->i_ino); + BUFFER_TRACE(old.dir_bh, "call ext4_handle_dirty_metadata"); + if (!old.dir_inlined) { + if (is_dx(old.inode)) { retval = ext4_handle_dirty_dx_node(handle, - old_inode, - dir_bh); + old.inode, + old.dir_bh); } else { retval = ext4_handle_dirty_dirent_node(handle, - old_inode, dir_bh); + old.inode, old.dir_bh); } } else { - retval = ext4_mark_inode_dirty(handle, old_inode); + retval = ext4_mark_inode_dirty(handle, old.inode); } if (retval) { - ext4_std_error(old_dir->i_sb, retval); + ext4_std_error(old.dir->i_sb, retval); goto end_rename; } - ext4_dec_count(handle, old_dir); - if (new_inode) { + ext4_dec_count(handle, old.dir); + if (new.inode) { /* checked empty_dir above, can't have another parent, * ext4_dec_count() won't work for many-linked dirs */ - clear_nlink(new_inode); + clear_nlink(new.inode); } else { - ext4_inc_count(handle, new_dir); - ext4_update_dx_flag(new_dir); - ext4_mark_inode_dirty(handle, new_dir); + ext4_inc_count(handle, new.dir); + ext4_update_dx_flag(new.dir); + ext4_mark_inode_dirty(handle, new.dir); } } - ext4_mark_inode_dirty(handle, old_dir); - if (new_inode) { - ext4_mark_inode_dirty(handle, new_inode); - if (!new_inode->i_nlink) - ext4_orphan_add(handle, new_inode); + ext4_mark_inode_dirty(handle, old.dir); + if (new.inode) { + ext4_mark_inode_dirty(handle, new.inode); + if (!new.inode->i_nlink) + ext4_orphan_add(handle, new.inode); } retval = 0; end_rename: - brelse(dir_bh); - brelse(old_bh); - brelse(new_bh); + brelse(old.dir_bh); + brelse(old.bh); + brelse(new.bh); if (handle) ext4_journal_stop(handle); return retval; -- GitLab