1 files changed, 81 insertions, 35 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0283cf366c2a..fd34b5755c0b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -125,8 +125,10 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 #define FMODE_EXEC		((__force fmode_t)(1 << 5))
 /* File writes are restricted (block device specific) */
 #define FMODE_WRITE_RESTRICTED	((__force fmode_t)(1 << 6))
+/* File supports atomic writes */
+#define FMODE_CAN_ATOMIC_WRITE	((__force fmode_t)(1 << 7))
 
-/* FMODE_* bits 7 to 8 */
+/* FMODE_* bit 8 */
 
 /* 32bit hashes as llseek() offset (for directories) */
 #define FMODE_32BITHASH         ((__force fmode_t)(1 << 9))
@@ -317,6 +319,7 @@ struct readahead_control;
 #define IOCB_SYNC		(__force int) RWF_SYNC
 #define IOCB_NOWAIT		(__force int) RWF_NOWAIT
 #define IOCB_APPEND		(__force int) RWF_APPEND
+#define IOCB_ATOMIC		(__force int) RWF_ATOMIC
 
 /* non-RWF related bits - start at 16 */
 #define IOCB_EVENTFD		(1 << 16)
@@ -351,6 +354,7 @@ struct readahead_control;
 	{ IOCB_SYNC,		"SYNC" }, \
 	{ IOCB_NOWAIT,		"NOWAIT" }, \
 	{ IOCB_APPEND,		"APPEND" }, \
+	{ IOCB_ATOMIC,		"ATOMIC"}, \
 	{ IOCB_EVENTFD,		"EVENTFD"}, \
 	{ IOCB_DIRECT,		"DIRECT" }, \
 	{ IOCB_WRITE,		"WRITE" }, \
@@ -660,9 +664,13 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	__i_atime;
-	struct timespec64	__i_mtime;
-	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
+	time64_t		i_atime_sec;
+	time64_t		i_mtime_sec;
+	time64_t		i_ctime_sec;
+	u32			i_atime_nsec;
+	u32			i_mtime_nsec;
+	u32			i_ctime_nsec;
+	u32			i_generation;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -719,10 +727,10 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
+	/* 32-bit hole reserved for expanding i_fsnotify_mask */
 	struct fsnotify_mark_connector __rcu	*i_fsnotify_marks;
 #endif
 
@@ -1538,23 +1546,27 @@ struct timespec64 inode_set_ctime_current(struct inode *inode);
 
 static inline time64_t inode_get_atime_sec(const struct inode *inode)
 {
-	return inode->__i_atime.tv_sec;
+	return inode->i_atime_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->__i_atime.tv_nsec;
+	return inode->i_atime_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->__i_atime;
+	struct timespec64 ts = { .tv_sec  = inode_get_atime_sec(inode),
+				 .tv_nsec = inode_get_atime_nsec(inode) };
+
+	return ts;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->__i_atime = ts;
+	inode->i_atime_sec = ts.tv_sec;
+	inode->i_atime_nsec = ts.tv_nsec;
 	return ts;
 }
 
@@ -1563,28 +1575,32 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 {
 	struct timespec64 ts = { .tv_sec  = sec,
 				 .tv_nsec = nsec };
+
 	return inode_set_atime_to_ts(inode, ts);
 }
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->__i_mtime.tv_sec;
+	return inode->i_mtime_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->__i_mtime.tv_nsec;
+	return inode->i_mtime_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->__i_mtime;
+	struct timespec64 ts = { .tv_sec  = inode_get_mtime_sec(inode),
+				 .tv_nsec = inode_get_mtime_nsec(inode) };
+	return ts;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->__i_mtime = ts;
+	inode->i_mtime_sec = ts.tv_sec;
+	inode->i_mtime_nsec = ts.tv_nsec;
 	return ts;
 }
 
@@ -1598,23 +1614,27 @@ static inline struct timespec64 inode_set_mtime(struct inode *inode,
 
 static inline time64_t inode_get_ctime_sec(const struct inode *inode)
 {
-	return inode->__i_ctime.tv_sec;
+	return inode->i_ctime_sec;
 }
 
 static inline long inode_get_ctime_nsec(const struct inode *inode)
 {
-	return inode->__i_ctime.tv_nsec;
+	return inode->i_ctime_nsec;
 }
 
 static inline struct timespec64 inode_get_ctime(const struct inode *inode)
 {
-	return inode->__i_ctime;
+	struct timespec64 ts = { .tv_sec  = inode_get_ctime_sec(inode),
+				 .tv_nsec = inode_get_ctime_nsec(inode) };
+
+	return ts;
 }
 
 static inline struct timespec64 inode_set_ctime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->__i_ctime = ts;
+	inode->i_ctime_sec = ts.tv_sec;
+	inode->i_ctime_nsec = ts.tv_nsec;
 	return ts;
 }
 
@@ -1926,6 +1946,8 @@ void inode_init_owner(struct mnt_idmap *idmap, struct inode *inode,
 extern bool may_open_dev(const struct path *path);
 umode_t mode_strip_sgid(struct mnt_idmap *idmap,
 			const struct inode *dir, umode_t mode);
+bool in_group_or_capable(struct mnt_idmap *idmap,
+			 const struct inode *inode, vfsgid_t vfsgid);
 
 /*
  * This is the "filldir" function type, used by readdir() to let
@@ -2685,7 +2707,7 @@ static inline struct file *file_clone_open(struct file *file)
 }
 extern int filp_close(struct file *, fl_owner_t id);
 
-extern struct filename *getname_flags(const char __user *, int, int *);
+extern struct filename *getname_flags(const char __user *, int);
 extern struct filename *getname_uflags(const char __user *, int);
 extern struct filename *getname(const char __user *);
 extern struct filename *getname_kernel(const char *);
@@ -3029,7 +3051,12 @@ extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval,
 		int (*test)(struct inode *, void *),
 		int (*set)(struct inode *, void *),
 		void *data);
-extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+struct inode *iget5_locked(struct super_block *, unsigned long,
+			   int (*test)(struct inode *, void *),
+			   int (*set)(struct inode *, void *), void *);
+struct inode *iget5_locked_rcu(struct super_block *, unsigned long,
+			       int (*test)(struct inode *, void *),
+			       int (*set)(struct inode *, void *), void *);
 extern struct inode * iget_locked(struct super_block *, unsigned long);
 extern struct inode *find_inode_nowait(struct super_block *,
 				       unsigned long,
@@ -3231,6 +3258,9 @@ extern const struct inode_operations page_symlink_inode_operations;
 extern void kfree_link(void *);
 void generic_fillattr(struct mnt_idmap *, u32, struct inode *, struct kstat *);
 void generic_fill_statx_attr(struct inode *inode, struct kstat *stat);
+void generic_fill_statx_atomic_writes(struct kstat *stat,
+				      unsigned int unit_min,
+				      unsigned int unit_max);
 extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int);
 extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
 void __inode_add_bytes(struct inode *inode, loff_t bytes);
@@ -3351,6 +3381,10 @@ extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
 extern int generic_check_addressable(unsigned, u64);
 
 extern void generic_set_sb_d_ops(struct super_block *sb);
+extern int generic_ci_match(const struct inode *parent,
+			    const struct qstr *name,
+			    const struct qstr *folded_name,
+			    const u8 *de_name, u32 de_name_len);
 
 static inline bool sb_has_encoding(const struct super_block *sb)
 {
@@ -3403,7 +3437,8 @@ static inline int iocb_flags(struct file *file)
 	return res;
 }
 
-static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
+static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags,
+				     int rw_type)
 {
 	int kiocb_flags = 0;
 
@@ -3422,6 +3457,12 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
 			return -EOPNOTSUPP;
 		kiocb_flags |= IOCB_NOIO;
 	}
+	if (flags & RWF_ATOMIC) {
+		if (rw_type != WRITE)
+			return -EOPNOTSUPP;
+		if (!(ki->ki_filp->f_mode & FMODE_CAN_ATOMIC_WRITE))
+			return -EOPNOTSUPP;
+	}
 	kiocb_flags |= (__force int) (flags & RWF_SUPPORTED);
 	if (flags & RWF_SYNC)
 		kiocb_flags |= IOCB_DSYNC;
@@ -3436,20 +3477,6 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
 	return 0;
 }
 
-static inline ino_t parent_ino(struct dentry *dentry)
-{
-	ino_t res;
-
-	/*
-	 * Don't strictly need d_lock here? If the parent ino could change
-	 * then surely we'd have a deeper race in the caller?
-	 */
-	spin_lock(&dentry->d_lock);
-	res = dentry->d_parent->d_inode->i_ino;
-	spin_unlock(&dentry->d_lock);
-	return res;
-}
-
 /* Transaction based IO helpers */
 
 /*
@@ -3574,7 +3601,7 @@ static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
 static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
 {
 	return ctx->actor(ctx, "..", 2, ctx->pos,
-			  parent_ino(file->f_path.dentry), DT_DIR);
+			  d_parent_ino(file->f_path.dentry), DT_DIR);
 }
 static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
 {
@@ -3613,4 +3640,23 @@ extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
 extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
 			   int advice);
 
+static inline bool vfs_empty_path(int dfd, const char __user *path)
+{
+	char c;
+
+	if (dfd < 0)
+		return false;
+
+	/* We now allow NULL to be used for empty path. */
+	if (!path)
+		return true;
+
+	if (unlikely(get_user(c, path)))
+		return false;
+
+	return !c;
+}
+
+bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos);
+
 #endif /* _LINUX_FS_H */