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Subject[PATCH] ext4: Convert ext4_extent.ee_start to ext4_extent.ee_start_lo
Date
From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

Convert ext4_extent.ee_start to ext4_extent.ee_start_lo
This helps in finding BUGs due to direct partial access of
these split 48 bit values

Also fix direct partial access in ext4 code

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/ext4/extents.c | 8 +++-----
include/linux/ext4_fs_extents.h | 2 +-
2 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 2be404f..c03056a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -52,7 +52,7 @@ static ext4_fsblk_t ext_pblock(struct ext4_extent *ex)
{
ext4_fsblk_t block;

- block = le32_to_cpu(ex->ee_start);
+ block = le32_to_cpu(ex->ee_start_lo);
block |= ((ext4_fsblk_t) le16_to_cpu(ex->ee_start_hi) << 31) << 1;
return block;
}
@@ -77,7 +77,7 @@ static ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
*/
static void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
{
- ex->ee_start = cpu_to_le32((unsigned long) (pb & 0xffffffff));
+ ex->ee_start_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
}

@@ -1409,8 +1409,7 @@ has_space:
eh->eh_entries = cpu_to_le16(le16_to_cpu(eh->eh_entries)+1);
nearex = path[depth].p_ext;
nearex->ee_block = newext->ee_block;
- nearex->ee_start = newext->ee_start;
- nearex->ee_start_hi = newext->ee_start_hi;
+ ext4_ext_store_pblock(nearex, ext_pblock(newext));
nearex->ee_len = newext->ee_len;

merge:
@@ -2177,7 +2176,6 @@ int ext4_ext_convert_to_initialized(handle_t *handle, struct inode *inode,
}
/* ex2: iblock to iblock + maxblocks-1 : initialised */
ex2->ee_block = cpu_to_le32(iblock);
- ex2->ee_start = cpu_to_le32(newblock);
ext4_ext_store_pblock(ex2, newblock);
ex2->ee_len = cpu_to_le16(allocated);
if (ex2 != ex)
diff --git a/include/linux/ext4_fs_extents.h b/include/linux/ext4_fs_extents.h
index 81406f3..cb2dfbb 100644
--- a/include/linux/ext4_fs_extents.h
+++ b/include/linux/ext4_fs_extents.h
@@ -74,7 +74,7 @@ struct ext4_extent {
__le32 ee_block; /* first logical block extent covers */
__le16 ee_len; /* number of blocks covered by extent */
__le16 ee_start_hi; /* high 16 bits of physical block */
- __le32 ee_start; /* low 32 bits of physical block */
+ __le32 ee_start_lo; /* low 32 bits of physical block */
};

/*
--
1.5.3.2.81.g17ed
-
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