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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-04 14:03:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-04 14:03:05 -0700
commit7df934526c0b3775613502dcd19ab6d2da8cce1e (patch)
tree01e6a4ea20c676228f4acefc6ae776d2e52072db /include
parent3c83e61e67256e0bb08c46cc2db43b58fd617251 (diff)
parentbd42998a6bcb9b1708dac9ca9876e3d304c16f3d (diff)
Merge branch 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull renameat2 system call from Miklos Szeredi: "This adds a new syscall, renameat2(), which is the same as renameat() but with a flags argument. The purpose of extending rename is to add cross-rename, a symmetric variant of rename, which exchanges the two files. This allows interesting things, which were not possible before, for example atomically replacing a directory tree with a symlink, etc... This also allows overlayfs and friends to operate on whiteouts atomically. Andy Lutomirski also suggested a "noreplace" flag, which disables the overwriting behavior of rename. These two flags, RENAME_EXCHANGE and RENAME_NOREPLACE are only implemented for ext4 as an example and for testing" * 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ext4: add cross rename support ext4: rename: split out helper functions ext4: rename: move EMLINK check up ext4: rename: create ext4_renament structure for local vars vfs: add cross-rename vfs: lock_two_nondirectories: allow directory args security: add flags to rename hooks vfs: add RENAME_NOREPLACE flag vfs: add renameat2 syscall vfs: rename: use common code for dir and non-dir vfs: rename: move d_move() up vfs: add d_is_dir()
Diffstat (limited to 'include')
-rw-r--r--include/linux/dcache.h8
-rw-r--r--include/linux/fs.h4
-rw-r--r--include/linux/security.h12
-rw-r--r--include/uapi/linux/fs.h3
4 files changed, 21 insertions, 6 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index bf72e9ac6de0..3b9bfdb83ba6 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -308,6 +308,7 @@ extern void dentry_update_name_case(struct dentry *, struct qstr *);
/* used for rename() and baskets */
extern void d_move(struct dentry *, struct dentry *);
+extern void d_exchange(struct dentry *, struct dentry *);
extern struct dentry *d_ancestor(struct dentry *, struct dentry *);
/* appendix may either be NULL or be used for transname suffixes */
@@ -429,7 +430,7 @@ static inline unsigned __d_entry_type(const struct dentry *dentry)
return dentry->d_flags & DCACHE_ENTRY_TYPE;
}
-static inline bool d_is_directory(const struct dentry *dentry)
+static inline bool d_can_lookup(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;
}
@@ -439,6 +440,11 @@ static inline bool d_is_autodir(const struct dentry *dentry)
return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE;
}
+static inline bool d_is_dir(const struct dentry *dentry)
+{
+ return d_can_lookup(dentry) || d_is_autodir(dentry);
+}
+
static inline bool d_is_symlink(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca9420f627e..215cb1b09f47 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1461,7 +1461,7 @@ extern int vfs_symlink(struct inode *, struct dentry *, const char *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
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 *, struct inode **);
+extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
/*
* VFS dentry helper functions.
@@ -1572,6 +1572,8 @@ struct inode_operations {
int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *);
+ int (*rename2) (struct inode *, struct dentry *,
+ struct inode *, struct dentry *, unsigned int);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
diff --git a/include/linux/security.h b/include/linux/security.h
index 2fc42d191f79..6478ce3252c7 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1793,7 +1793,8 @@ int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
int security_inode_rmdir(struct inode *dir, struct dentry *dentry);
int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev);
int security_inode_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,
+ unsigned int flags);
int security_inode_readlink(struct dentry *dentry);
int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);
int security_inode_permission(struct inode *inode, int mask);
@@ -2161,7 +2162,8 @@ static inline int security_inode_mknod(struct inode *dir,
static inline int security_inode_rename(struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
- struct dentry *new_dentry)
+ struct dentry *new_dentry,
+ unsigned int flags)
{
return 0;
}
@@ -2955,7 +2957,8 @@ int security_path_symlink(struct path *dir, struct dentry *dentry,
int security_path_link(struct dentry *old_dentry, struct path *new_dir,
struct dentry *new_dentry);
int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
- struct path *new_dir, struct dentry *new_dentry);
+ struct path *new_dir, struct dentry *new_dentry,
+ unsigned int flags);
int security_path_chmod(struct path *path, umode_t mode);
int security_path_chown(struct path *path, kuid_t uid, kgid_t gid);
int security_path_chroot(struct path *path);
@@ -3003,7 +3006,8 @@ static inline int security_path_link(struct dentry *old_dentry,
static inline int security_path_rename(struct path *old_dir,
struct dentry *old_dentry,
struct path *new_dir,
- struct dentry *new_dentry)
+ struct dentry *new_dentry,
+ unsigned int flags)
{
return 0;
}
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 6c28b61bb690..ca1a11bb4443 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -35,6 +35,9 @@
#define SEEK_HOLE 4 /* seek to the next hole */
#define SEEK_MAX SEEK_HOLE
+#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
+#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
+
struct fstrim_range {
__u64 start;
__u64 len;