[PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[Jeff Layton]

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca610d42176..84fdaf399fbe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1517,23 +1517,23 @@ 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.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1547,23 +1547,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }
 
-- 
2.41.0

[f2fs-dev] [PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[Jeff Layton]

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca610d42176..84fdaf399fbe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1517,23 +1517,23 @@ 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.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1547,23 +1547,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }
 
-- 
2.41.0



_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

[PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[Jeff Layton]

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca610d42176..84fdaf399fbe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1517,23 +1517,23 @@ 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.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1547,23 +1547,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }
 
-- 
2.41.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[Jeff Layton]

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca610d42176..84fdaf399fbe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1517,23 +1517,23 @@ 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.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1547,23 +1547,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }
 
-- 
2.41.0


_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um

[PATCH v2 87/89] fs: rename inode i_atime and i_mtime fields

[Jeff Layton]

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ca610d42176..84fdaf399fbe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1517,23 +1517,23 @@ 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.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1547,23 +1547,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }
 
-- 
2.41.0

[PATCH v2 88/89] fs: switch timespec64 fields in inode to discrete integers

[Jeff Layton]

This shaves 8 bytes off struct inode with a garden-variety Fedora
Kconfig.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 53 ++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84fdaf399fbe..485b5e21c8e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,9 +671,12 @@ 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;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -1517,23 +1520,27 @@ 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;
 }
 
@@ -1542,28 +1549,32 @@ 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;
 }
 
@@ -1577,34 +1588,30 @@ 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;
 }
 
-/**
- * inode_set_ctime - set the ctime in the inode
- * @inode: inode in which to set the ctime
- * @sec: tv_sec value to set
- * @nsec: tv_nsec value to set
- *
- * Set the ctime in @inode to { @sec, @nsec }
- */
 static inline struct timespec64 inode_set_ctime(struct inode *inode,
 						time64_t sec, long nsec)
 {
-- 
2.41.0

[f2fs-dev] [PATCH v2 88/89] fs: switch timespec64 fields in inode to discrete integers

[Jeff Layton]

This shaves 8 bytes off struct inode with a garden-variety Fedora
Kconfig.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 53 ++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84fdaf399fbe..485b5e21c8e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,9 +671,12 @@ 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;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -1517,23 +1520,27 @@ 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;
 }
 
@@ -1542,28 +1549,32 @@ 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;
 }
 
@@ -1577,34 +1588,30 @@ 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;
 }
 
-/**
- * inode_set_ctime - set the ctime in the inode
- * @inode: inode in which to set the ctime
- * @sec: tv_sec value to set
- * @nsec: tv_nsec value to set
- *
- * Set the ctime in @inode to { @sec, @nsec }
- */
 static inline struct timespec64 inode_set_ctime(struct inode *inode,
 						time64_t sec, long nsec)
 {
-- 
2.41.0



_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

[PATCH v2 88/89] fs: switch timespec64 fields in inode to discrete integers

[Jeff Layton]

This shaves 8 bytes off struct inode with a garden-variety Fedora
Kconfig.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 53 ++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84fdaf399fbe..485b5e21c8e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,9 +671,12 @@ 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;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -1517,23 +1520,27 @@ 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;
 }
 
@@ -1542,28 +1549,32 @@ 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;
 }
 
@@ -1577,34 +1588,30 @@ 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;
 }
 
-/**
- * inode_set_ctime - set the ctime in the inode
- * @inode: inode in which to set the ctime
- * @sec: tv_sec value to set
- * @nsec: tv_nsec value to set
- *
- * Set the ctime in @inode to { @sec, @nsec }
- */
 static inline struct timespec64 inode_set_ctime(struct inode *inode,
 						time64_t sec, long nsec)
 {
-- 
2.41.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 88/89] fs: switch timespec64 fields in inode to discrete integers

[Jeff Layton]

This shaves 8 bytes off struct inode with a garden-variety Fedora
Kconfig.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 53 ++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84fdaf399fbe..485b5e21c8e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,9 +671,12 @@ 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;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -1517,23 +1520,27 @@ 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;
 }
 
@@ -1542,28 +1549,32 @@ 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;
 }
 
@@ -1577,34 +1588,30 @@ 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;
 }
 
-/**
- * inode_set_ctime - set the ctime in the inode
- * @inode: inode in which to set the ctime
- * @sec: tv_sec value to set
- * @nsec: tv_nsec value to set
- *
- * Set the ctime in @inode to { @sec, @nsec }
- */
 static inline struct timespec64 inode_set_ctime(struct inode *inode,
 						time64_t sec, long nsec)
 {
-- 
2.41.0


_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um

[PATCH v2 88/89] fs: switch timespec64 fields in inode to discrete integers

[Jeff Layton]

This shaves 8 bytes off struct inode with a garden-variety Fedora
Kconfig.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 53 ++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84fdaf399fbe..485b5e21c8e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -671,9 +671,12 @@ 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;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
 	u8			i_blkbits;
@@ -1517,23 +1520,27 @@ 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;
 }
 
@@ -1542,28 +1549,32 @@ 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;
 }
 
@@ -1577,34 +1588,30 @@ 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;
 }
 
-/**
- * inode_set_ctime - set the ctime in the inode
- * @inode: inode in which to set the ctime
- * @sec: tv_sec value to set
- * @nsec: tv_nsec value to set
- *
- * Set the ctime in @inode to { @sec, @nsec }
- */
 static inline struct timespec64 inode_set_ctime(struct inode *inode,
 						time64_t sec, long nsec)
 {
-- 
2.41.0

[PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

The recent change to use discrete integers instead of struct timespec64
shaved 8 bytes off of struct inode, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.

Move i_generation above the i_lock, which moves the new 4 byte hole to
just after the i_fsnotify_mask in my setup.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 485b5e21c8e5..686c9f33e725 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,7 @@ struct inode {
 	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;
@@ -733,7 +734,6 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
-- 
2.41.0

[f2fs-dev] [PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

The recent change to use discrete integers instead of struct timespec64
shaved 8 bytes off of struct inode, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.

Move i_generation above the i_lock, which moves the new 4 byte hole to
just after the i_fsnotify_mask in my setup.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 485b5e21c8e5..686c9f33e725 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,7 @@ struct inode {
 	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;
@@ -733,7 +734,6 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
-- 
2.41.0



_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

[PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

The recent change to use discrete integers instead of struct timespec64
shaved 8 bytes off of struct inode, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.

Move i_generation above the i_lock, which moves the new 4 byte hole to
just after the i_fsnotify_mask in my setup.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 485b5e21c8e5..686c9f33e725 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,7 @@ struct inode {
 	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;
@@ -733,7 +734,6 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
-- 
2.41.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

The recent change to use discrete integers instead of struct timespec64
shaved 8 bytes off of struct inode, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.

Move i_generation above the i_lock, which moves the new 4 byte hole to
just after the i_fsnotify_mask in my setup.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 485b5e21c8e5..686c9f33e725 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,7 @@ struct inode {
 	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;
@@ -733,7 +734,6 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
-- 
2.41.0


_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um

[PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

The recent change to use discrete integers instead of struct timespec64
shaved 8 bytes off of struct inode, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.

Move i_generation above the i_lock, which moves the new 4 byte hole to
just after the i_fsnotify_mask in my setup.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 485b5e21c8e5..686c9f33e725 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,7 @@ struct inode {
 	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;
@@ -733,7 +734,6 @@ struct inode {
 		unsigned		i_dir_seq;
 	};
 
-	__u32			i_generation;
 
 #ifdef CONFIG_FSNOTIFY
 	__u32			i_fsnotify_mask; /* all events this inode cares about */
-- 
2.41.0

Re: [PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Amir Goldstein]

On Wed, Oct 4, 2023 at 9:56 PM Jeff Layton <jlayton@kernel.org> wrote:
>
> The recent change to use discrete integers instead of struct timespec64
> shaved 8 bytes off of struct inode, but it also moves the i_lock
> into the previous cacheline, away from the fields that it protects.
>
> Move i_generation above the i_lock, which moves the new 4 byte hole to
> just after the i_fsnotify_mask in my setup.

Might be good to mention that this hole has a purpose...

>
> Suggested-by: Amir Goldstein <amir73il@gmail.com>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
>  include/linux/fs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 485b5e21c8e5..686c9f33e725 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -677,6 +677,7 @@ struct inode {
>         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;
> @@ -733,7 +734,6 @@ struct inode {
>                 unsigned                i_dir_seq;
>         };
>
> -       __u32                   i_generation;
>
>  #ifdef CONFIG_FSNOTIFY
>         __u32                   i_fsnotify_mask; /* all events this inode cares about */

If you post another version, please leave a comment here

+         /* 32bit hole reserved for expanding i_fsnotify_mask to 64bit */

Thanks,
Amir.

Re: [PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Jeff Layton]

On Thu, 2023-10-05 at 08:08 +0300, Amir Goldstein wrote:
> On Wed, Oct 4, 2023 at 9:56 PM Jeff Layton <jlayton@kernel.org> wrote:
> > 
> > The recent change to use discrete integers instead of struct timespec64
> > shaved 8 bytes off of struct inode, but it also moves the i_lock
> > into the previous cacheline, away from the fields that it protects.
> > 
> > Move i_generation above the i_lock, which moves the new 4 byte hole to
> > just after the i_fsnotify_mask in my setup.
> 
> Might be good to mention that this hole has a purpose...
> 
> > 
> > Suggested-by: Amir Goldstein <amir73il@gmail.com>
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > ---
> >  include/linux/fs.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index 485b5e21c8e5..686c9f33e725 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -677,6 +677,7 @@ struct inode {
> >         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;
> > @@ -733,7 +734,6 @@ struct inode {
> >                 unsigned                i_dir_seq;
> >         };
> > 
> > -       __u32                   i_generation;
> > 
> >  #ifdef CONFIG_FSNOTIFY
> >         __u32                   i_fsnotify_mask; /* all events this inode cares about */
> 
> If you post another version, please leave a comment here
> 
> +         /* 32bit hole reserved for expanding i_fsnotify_mask to 64bit */
> 

Sure.

I suppose we could create a union there too if you really want to
reserve it:

	union {
		__u32		i_fsnotify_mask;
		__u64		__i_fsnotify_mask_ext;
	};

-- 
Jeff Layton <jlayton@kernel.org>

Re: [PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion

[Amir Goldstein]

On Thu, Oct 5, 2023 at 3:45 PM Jeff Layton <jlayton@kernel.org> wrote:
>
> On Thu, 2023-10-05 at 08:08 +0300, Amir Goldstein wrote:
> > On Wed, Oct 4, 2023 at 9:56 PM Jeff Layton <jlayton@kernel.org> wrote:
> > >
> > > The recent change to use discrete integers instead of struct timespec64
> > > shaved 8 bytes off of struct inode, but it also moves the i_lock
> > > into the previous cacheline, away from the fields that it protects.
> > >
> > > Move i_generation above the i_lock, which moves the new 4 byte hole to
> > > just after the i_fsnotify_mask in my setup.
> >
> > Might be good to mention that this hole has a purpose...
> >
> > >
> > > Suggested-by: Amir Goldstein <amir73il@gmail.com>
> > > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > > ---
> > >  include/linux/fs.h | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > > index 485b5e21c8e5..686c9f33e725 100644
> > > --- a/include/linux/fs.h
> > > +++ b/include/linux/fs.h
> > > @@ -677,6 +677,7 @@ struct inode {
> > >         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;
> > > @@ -733,7 +734,6 @@ struct inode {
> > >                 unsigned                i_dir_seq;
> > >         };
> > >
> > > -       __u32                   i_generation;
> > >
> > >  #ifdef CONFIG_FSNOTIFY
> > >         __u32                   i_fsnotify_mask; /* all events this inode cares about */
> >
> > If you post another version, please leave a comment here
> >
> > +         /* 32bit hole reserved for expanding i_fsnotify_mask to 64bit */
> >
>
> Sure.
>
> I suppose we could create a union there too if you really want to
> reserve it:
>
>         union {
>                 __u32           i_fsnotify_mask;
>                 __u64           __i_fsnotify_mask_ext;
>         };
>

No need.
I was thinking it is going to be
      unsigned long i_fsnotify_mask;

on 32bit arch, we either not support the high bitmask events
or we fold them with the lower 32bit in the inode mask,
because i_fsnotify_mask is an optimization to avoid going
into inode marks iteration.

Thanks,
Amir.