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Subject[PATCH v2 1/3] fat: add a vfat_rename2() and make existing .rename callback a helper
Date
Currently vfat only supports the RENAME_NOREPLACE flag which is handled by
the virtual file system layer but doesn't support the RENAME_EXCHANGE flag.

Add a vfat_rename2() function to be used as the .rename callback and move
the current vfat_rename() handler to a helper. This is in preparation for
implementing the RENAME_NOREPLACE flag using a different helper function.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

(no changes since v1)

fs/fat/namei_vfat.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index c573314806cf..88ccb2ee3537 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -889,9 +889,8 @@ static int vfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
return err;
}

-static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
- struct dentry *old_dentry, struct inode *new_dir,
- struct dentry *new_dentry, unsigned int flags)
+static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
{
struct buffer_head *dotdot_bh;
struct msdos_dir_entry *dotdot_de;
@@ -902,9 +901,6 @@ static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
int err, is_dir, update_dotdot, corrupt = 0;
struct super_block *sb = old_dir->i_sb;

- if (flags & ~RENAME_NOREPLACE)
- return -EINVAL;
-
old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
old_inode = d_inode(old_dentry);
new_inode = d_inode(new_dentry);
@@ -1021,13 +1017,24 @@ static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
goto out;
}

+static int vfat_rename2(struct user_namespace *mnt_userns, struct inode *old_dir,
+ struct dentry *old_dentry, struct inode *new_dir,
+ struct dentry *new_dentry, unsigned int flags)
+{
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
+ /* VFS already handled RENAME_NOREPLACE, handle it as a normal rename */
+ return vfat_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
static const struct inode_operations vfat_dir_inode_operations = {
.create = vfat_create,
.lookup = vfat_lookup,
.unlink = vfat_unlink,
.mkdir = vfat_mkdir,
.rmdir = vfat_rmdir,
- .rename = vfat_rename,
+ .rename = vfat_rename2,
.setattr = fat_setattr,
.getattr = fat_getattr,
.update_time = fat_update_time,
--
2.36.1
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