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gfs2: Support negative atimes 

When inodes are read from disk, GFS2 will only update in-memory atimes
older than the on-disk atimes; this prevents atimes from going
backwards.  The atimes of newly allocated inodes are initialized to 0.
This means that when an atime is explicitly set to a negative value,
this value will not persist.

Fix by setting the atime of newly allocated inodes to the lowest
possible value instead of 0.

Fixes xfstest generic/258.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2017-09-22 08:34:46 -05:00 committed by Bob Peterson
parent 9b7c2ddb45
commit 38eedf2841
1 changed files with 2 additions and 1 deletions
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3
fs/gfs2/inode.c
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@ -189,7 +189,8 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
gfs2_set_iop(inode);
inode->i_atime.tv_sec = 0;
/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
inode->i_atime.tv_nsec = 0;
unlock_new_inode(inode);