From: Markus Rechberger Taken from http://bugzilla.kernel.org/show_bug.cgi?id=5079 signed long ranges from -2.147.483.648 to 2.147.483.647 on x86 32bit 10000011110110100100111110111101 .. -2,082,844,739 10000011110110100100111110111101 .. 2,212,122,557 <- this currently gets stored on the disk but when converting it to a 64bit signed long value it loses its sign and becomes positive. Cc: Andreas Dilger Cc: Signed-off-by: Andrew Morton --- fs/ext2/inode.c | 6 +++--- fs/ext3/inode.c | 6 +++--- fs/ext4/inode.c | 6 +++--- 3 files changed, 9 insertions(+), 9 deletions(-) diff -puN fs/ext2/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems fs/ext2/inode.c --- a/fs/ext2/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems +++ a/fs/ext2/inode.c @@ -1077,9 +1077,9 @@ void ext2_read_inode (struct inode * ino } inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); inode->i_size = le32_to_cpu(raw_inode->i_size); - inode->i_atime.tv_sec = le32_to_cpu(raw_inode->i_atime); - inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->i_ctime); - inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->i_mtime); + inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); + inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); + inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0; ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); /* We now have enough fields to check if the inode was active or not. diff -puN fs/ext3/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems fs/ext3/inode.c --- a/fs/ext3/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems +++ a/fs/ext3/inode.c @@ -2670,9 +2670,9 @@ void ext3_read_inode(struct inode * inod } inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); inode->i_size = le32_to_cpu(raw_inode->i_size); - inode->i_atime.tv_sec = le32_to_cpu(raw_inode->i_atime); - inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->i_ctime); - inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->i_mtime); + inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); + inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); + inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0; ei->i_state = 0; diff -puN fs/ext4/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems fs/ext4/inode.c --- a/fs/ext4/inode.c~ext2-3-4-fix-file-date-underflow-on-ext2-3-filesystems-on-64-bit-systems +++ a/fs/ext4/inode.c @@ -2673,9 +2673,9 @@ void ext4_read_inode(struct inode * inod } inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); inode->i_size = le32_to_cpu(raw_inode->i_size); - inode->i_atime.tv_sec = le32_to_cpu(raw_inode->i_atime); - inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->i_ctime); - inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->i_mtime); + inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); + inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); + inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0; ei->i_state = 0; _