Aneesh Kumar K.V wrote:
Mingming Cao wrote:
On Tue, 2007-07-03 at 15:58 +0530, Kalpak Shah wrote:
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.
Missed this one.
Thanks. Will update ext4 patch queue tonight with this fix.
IIRC in the conference call it was decided to not to apply this patch.
Andreas may be able to update better.
Looking at the git log i understand the core patch got applied to ext4 tree with the comment
from Andreas. So may be we can apply this patch also.
commit 4d7bf11d649c72621ca31b8ea12b9c94af380e63
Andreas says:
This patch is now treating timestamps with the high bit set as negative
times (before Jan 1, 1970). This means we lose 1/2 of the possible range
of timestamps (lopping off 68 years before unix timestamp overflow -
now only 30 years away :-) to handle the extremely rare case of setting
timestamps into the distant past.
If we are only interested in fixing the underflow case, we could just
limit the values to 0 instead of storing negative values. At worst this
will skew the timestamp by a few hours for timezones in the far east
(files would still show Jan 1, 1970 in "ls -l" output).
That said, it seems 32-bit systems (mine at least) allow files to be set
into the past (01/01/1907 works fine) so it seems this patch is bringing
the x86_64 behaviour into sync with other kernels.
On the plus side, we have a patch that is ready to add nanosecond timestamps
to ext3 and as an added bonus adds 2 high bits to the on-disk timestamp so
this extends the maximum date to 2242.
NOTE: The conference call i mentioned above is http://ext4.wiki.kernel.org/index.php/Ext4_Developer%27s_Conference_Call
-aneesh
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