From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/cachefiles/namei.c | 2 +-
fs/namei.c | 30 ++++++++++++++++++++++++------
fs/nfsd/vfs.c | 2 +-
include/linux/fs.h | 2 +-
4 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 10cf5c6..ef23d2a 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -397,7 +397,7 @@ try_again:
cachefiles_io_error(cache, "Rename security error %d", ret);
} else {
ret = vfs_rename(dir->d_inode, rep,
- cache->graveyard->d_inode, grave);
+ cache->graveyard->d_inode, grave, NULL);
if (ret != 0 && ret != -ENOMEM)
cachefiles_io_error(cache,
"Rename failed with error %d", ret);
diff --git a/fs/namei.c b/fs/namei.c
index 66228a8..4d0982b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3735,7 +3735,8 @@ out:
}
static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+ struct inode *new_dir, struct dentry *new_dentry,
+ struct inode **delegated_inode)
{
struct inode *target = new_dentry->d_inode;
struct inode *source = old_dentry->d_inode;
@@ -3755,6 +3756,14 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
goto out;
+ error = try_break_deleg(source, delegated_inode);
+ if (error)
+ goto out;
+ if (target) {
+ error = try_break_deleg(target, delegated_inode);
+ if (error)
+ goto out;
+ }
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
goto out;
@@ -3773,7 +3782,8 @@ out:
}
int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+ struct inode *new_dir, struct dentry *new_dentry,
+ struct inode **delegated_inode)
{
int error;
int is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
@@ -3801,7 +3811,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (is_dir)
error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry);
else
- error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry);
+ error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry,delegated_inode);
if (!error)
fsnotify_move(old_dir, new_dir, old_name, is_dir,
new_dentry->d_inode, old_dentry);
@@ -3817,8 +3827,9 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
struct dentry *old_dentry, *new_dentry;
struct dentry *trap;
struct nameidata oldnd, newnd;
- struct filename *from;
- struct filename *to;
+ struct inode *delegated_inode = NULL;
+ char *from;
+ char *to;
int error;
from = user_path_parent(olddfd, oldname, &oldnd);
@@ -3854,6 +3865,7 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
newnd.flags &= ~LOOKUP_PARENT;
newnd.flags |= LOOKUP_RENAME_TARGET;
+retry_deleg:
trap = lock_rename(new_dir, old_dir);
old_dentry = lookup_hash(&oldnd);
@@ -3890,13 +3902,19 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
if (error)
goto exit5;
error = vfs_rename(old_dir->d_inode, old_dentry,
- new_dir->d_inode, new_dentry);
+ new_dir->d_inode, new_dentry,
+ &delegated_inode);
exit5:
dput(new_dentry);
exit4:
dput(old_dentry);
exit3:
unlock_rename(new_dir, old_dir);
+ if (delegated_inode) {
+ error = break_deleg_wait(&delegated_inode);
+ if (!error)
+ goto retry_deleg;
+ }
mnt_drop_write(oldnd.path.mnt);
exit2:
path_put(&newnd.path);
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index c51f4c9..903fae1 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1820,7 +1820,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
if (host_err)
goto out_dput_new;
}
- host_err = vfs_rename(fdir, odentry, tdir, ndentry);
+ host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL);
if (!host_err) {
host_err = commit_metadata(tfhp);
if (!host_err)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0e761e7..84183db 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1400,7 +1400,7 @@ extern int vfs_symlink(struct inode *, struct dentry *, const char *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
-extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
+extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **);
/*
* VFS dentry helper functions.
--
1.7.9.5
--
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