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Date: Tue, 20 May 2014 11:22:47 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Al Viro <viro@...IV.linux.org.uk>,
Christoph Hellwig <hch@...radead.org>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH] vfs: call rename2 if exists
Linus,
Please consider applying this patch to 3.15, so we can move forward with adding
RENAME_NOREPLACE support to filesystems during the next cycle.
Thanks,
Miklos
---
From: Miklos Szeredi <mszeredi@...e.cz>
Christoph Hellwig suggests:
1) make vfs_rename call ->rename2 if it exists instead of ->rename
2) switch all filesystems that you're adding NOREPLACE support for to
use ->rename2
3) see how many ->rename instances we'll have left after a few
iterations of 2.
Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
Acked-by: Christoph Hellwig <hch@....de>
---
fs/ext4/namei.c | 1 -
fs/fuse/dir.c | 26 +++++++++++---------------
fs/namei.c | 5 +++--
3 files changed, 14 insertions(+), 18 deletions(-)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -814,13 +814,6 @@ static int fuse_rename_common(struct ino
return err;
}
-static int fuse_rename(struct inode *olddir, struct dentry *oldent,
- struct inode *newdir, struct dentry *newent)
-{
- return fuse_rename_common(olddir, oldent, newdir, newent, 0,
- FUSE_RENAME, sizeof(struct fuse_rename_in));
-}
-
static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
struct inode *newdir, struct dentry *newent,
unsigned int flags)
@@ -831,17 +824,21 @@ static int fuse_rename2(struct inode *ol
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
return -EINVAL;
- if (fc->no_rename2 || fc->minor < 23)
- return -EINVAL;
+ if (flags) {
+ if (fc->no_rename2 || fc->minor < 23)
+ return -EINVAL;
- err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
+ err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
FUSE_RENAME2, sizeof(struct fuse_rename2_in));
- if (err == -ENOSYS) {
- fc->no_rename2 = 1;
- err = -EINVAL;
+ if (err == -ENOSYS) {
+ fc->no_rename2 = 1;
+ err = -EINVAL;
+ }
+ } else {
+ err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
+ FUSE_RENAME, sizeof(struct fuse_rename_in));
}
return err;
-
}
static int fuse_link(struct dentry *entry, struct inode *newdir,
@@ -2017,7 +2014,6 @@ static const struct inode_operations fus
.symlink = fuse_symlink,
.unlink = fuse_unlink,
.rmdir = fuse_rmdir,
- .rename = fuse_rename,
.rename2 = fuse_rename2,
.link = fuse_link,
.setattr = fuse_setattr,
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4073,7 +4073,7 @@ int vfs_rename(struct inode *old_dir, st
if (error)
return error;
- if (!old_dir->i_op->rename)
+ if (!old_dir->i_op->rename && !old_dir->i_op->rename2)
return -EPERM;
if (flags && !old_dir->i_op->rename2)
@@ -4132,10 +4132,11 @@ int vfs_rename(struct inode *old_dir, st
if (error)
goto out;
}
- if (!flags) {
+ if (!old_dir->i_op->rename2) {
error = old_dir->i_op->rename(old_dir, old_dentry,
new_dir, new_dentry);
} else {
+ WARN_ON(old_dir->i_op->rename != NULL);
error = old_dir->i_op->rename2(old_dir, old_dentry,
new_dir, new_dentry, flags);
}
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3434,7 +3434,6 @@ const struct inode_operations ext4_dir_i
.rmdir = ext4_rmdir,
.mknod = ext4_mknod,
.tmpfile = ext4_tmpfile,
- .rename = ext4_rename,
.rename2 = ext4_rename2,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
--
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