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SubjectRe: [EXT4 set 3][PATCH 1/1] ext4 nanosecond timestamp
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On Sun, 2007-07-01 at 03:36 -0400, Mingming Cao wrote:
> +
> +#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
> +do { \
> + (inode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime); \
> + if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
> + ext4_decode_extra_time(&(inode)->xtime, \
> + raw_inode->xtime ## _extra); \
> +} while (0)
> +
> +#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
> +do { \
> + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
> + (einode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime); \
> + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
> + ext4_decode_extra_time(&(einode)->xtime, \
> + raw_inode->xtime ## _extra); \
> +} while (0)
> +

This nanosecond patch seems to be missing the fix below which is required for http://bugzilla.kernel.org/show_bug.cgi?id=5079

If the timestamp is set to before epoch i.e. a negative timestamp then the file may have its date set into the future on 64-bit systems. So when the timestamp is read it must be cast as signed.

Index: linux-2.6.21/include/linux/ext4_fs.h
===================================================================
--- linux-2.6.21.orig/include/linux/ext4_fs.h
+++ linux-2.6.21/include/linux/ext4_fs.h
@@ -390,7 +390,7 @@ do { \

#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
do { \
- (inode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime); \
+ (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
ext4_decode_extra_time(&(inode)->xtime, \
raw_inode->xtime ## _extra); \
@@ -399,7 +399,8 @@ do { \
#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
do { \
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
- (einode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime); \
+ (einode)->xtime.tv_sec = \
+ (signed)le32_to_cpu((raw_inode)->xtime); \
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
ext4_decode_extra_time(&(einode)->xtime, \
raw_inode->xtime ## _extra); \

Thanks,
Kalpak.

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