linux-kernel - [PATCH] ext4: Convert s_r_blocks_count and s_free_blocks

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Date:	Thu,  4 Oct 2007 01:50:56 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	linux-kernel@...r.kernel.org
Cc:	linux-ext4@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH] ext4: Convert s_r_blocks_count and s_free_blocks_count

From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Convert s_r_blocks_count and s_free_blocks_count to
s_r_blocks_count_lo and s_free_blocks_count_lo

This helps in finding BUGs due to direct partial access of
these split 64 bit values

Also fix direct partial access in ext4 code

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/ext4/super.c         |    2 +-
 include/linux/ext4_fs.h |   12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dc7fe4c..dbd114c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2635,7 +2635,7 @@ static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
 	buf->f_bsize = sb->s_blocksize;
 	buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
 	buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
-	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
+	ext4_free_blocks_count_set(es, buf->f_bfree);
 	buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
 	if (buf->f_bfree < ext4_r_blocks_count(es))
 		buf->f_bavail = 0;
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 339412d..fb31c1a 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -502,8 +502,8 @@ do {									       \
 struct ext4_super_block {
 /*00*/	__le32	s_inodes_count;		/* Inodes count */
 	__le32	s_blocks_count_lo;	/* Blocks count */
-	__le32	s_r_blocks_count;	/* Reserved blocks count */
-	__le32	s_free_blocks_count;	/* Free blocks count */
+	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
+	__le32	s_free_blocks_count_lo;	/* Free blocks count */
 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
 	__le32	s_first_data_block;	/* First Data Block */
 	__le32	s_log_block_size;	/* Block size */
@@ -1007,13 +1007,13 @@ static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
 {
 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
-		le32_to_cpu(es->s_r_blocks_count);
+		le32_to_cpu(es->s_r_blocks_count_lo);
 }
 
 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
 {
 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
-		le32_to_cpu(es->s_free_blocks_count);
+		le32_to_cpu(es->s_free_blocks_count_lo);
 }
 
 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
@@ -1026,14 +1026,14 @@ static inline void ext4_blocks_count_set(struct ext4_super_block *es,
 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
 					      ext4_fsblk_t blk)
 {
-	es->s_free_blocks_count = cpu_to_le32((u32)blk);
+	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
 }
 
 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
 					   ext4_fsblk_t blk)
 {
-	es->s_r_blocks_count = cpu_to_le32((u32)blk);
+	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
 }
 
-- 
1.5.3.2.81.g17ed

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