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btrfs: pass the dentry to btrfs_log_new_name() instead of the inode 

[ Upstream commit d5f5bd5465 ]

In the next patch in the series, there will be the need to access the old
name, and its length, of an inode when logging the inode during a rename.
So instead of passing the inode to btrfs_log_new_name() pass the dentry,
because from the dentry we can get the inode, the name and its length.

This will avoid passing 3 new parameters to btrfs_log_new_name() in the
next patch - the name, its length and an index number. This way we end
up passing only 1 new parameter, the index number.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Filipe Manana 2022-01-20 11:00:07 +00:00 committed by Greg Kroah-Hartman
parent 90b9e48927
commit da7ad2ec58
3 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/btrfs/inode.c
View File

@ -6952,7 +6952,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
goto fail;
}
d_instantiate(dentry, inode);
btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent);
btrfs_log_new_name(trans, old_dentry, NULL, parent);
}
fail:
@ -9621,13 +9621,13 @@ static int btrfs_rename_exchange(struct inode *old_dir,
BTRFS_I(new_inode)->dir_index = new_idx;
if (root_log_pinned) {
btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
btrfs_log_new_name(trans, old_dentry, BTRFS_I(old_dir),
new_dentry->d_parent);
btrfs_end_log_trans(root);
root_log_pinned = false;
}
if (dest_log_pinned) {
btrfs_log_new_name(trans, BTRFS_I(new_inode), BTRFS_I(new_dir),
btrfs_log_new_name(trans, new_dentry, BTRFS_I(new_dir),
old_dentry->d_parent);
btrfs_end_log_trans(dest);
dest_log_pinned = false;
@ -9908,7 +9908,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
BTRFS_I(old_inode)->dir_index = index;
if (log_pinned) {
btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
btrfs_log_new_name(trans, old_dentry, BTRFS_I(old_dir),
new_dentry->d_parent);
btrfs_end_log_trans(root);
log_pinned = false;

19
fs/btrfs/tree-log.c
View File

@ -6628,14 +6628,25 @@ void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
mutex_unlock(&dir->log_mutex);
}
/*
* Call this after adding a new name for a file and it will properly
* update the log to reflect the new name.
/**
* Update the log after adding a new name for an inode.
*
* @trans: Transaction handle.
* @old_dentry: The dentry associated with the old name and the old
* parent directory.
* @old_dir: The inode of the previous parent directory for the case
* of a rename. For a link operation, it must be NULL.
* @parent: The dentry associated with the directory under which the
* new name is located.
*
* Call this after adding a new name for an inode, as a result of a link or
* rename operation, and it will properly update the log to reflect the new name.
*/
void btrfs_log_new_name(struct btrfs_trans_handle *trans,
struct btrfs_inode *inode, struct btrfs_inode *old_dir,
struct dentry *old_dentry, struct btrfs_inode *old_dir,
struct dentry *parent)
{
struct btrfs_inode *inode = BTRFS_I(d_inode(old_dentry));
struct btrfs_log_ctx ctx;
/*

2
fs/btrfs/tree-log.h
View File

@ -84,7 +84,7 @@ void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
struct btrfs_inode *dir);
void btrfs_log_new_name(struct btrfs_trans_handle *trans,
struct btrfs_inode *inode, struct btrfs_inode *old_dir,
struct dentry *old_dentry, struct btrfs_inode *old_dir,
struct dentry *parent);
#endif