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cifs: clarify comment about timestamp granularity for old servers

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It could be confusing why we set granularity to 1 seconds rather
than 2 seconds (1 second is the max the VFS allows) for these
mounts to very old servers ...

Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2019-10-11 17:36:13 -07:00
parent d532cc7efd
commit 553292a634
1 changed files with 7 additions and 1 deletions
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8
fs/cifs/cifsfs.c
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@ -169,7 +169,13 @@ cifs_read_super(struct super_block *sb)
else
sb->s_maxbytes = MAX_NON_LFS;
/* Some very old servers like DOS and OS/2 used 2 second granularity */
/*
* Some very old servers like DOS and OS/2 used 2 second granularity
* (while all current servers use 100ns granularity - see MS-DTYP)
* but 1 second is the maximum allowed granularity for the VFS
* so for old servers set time granularity to 1 second while for
* everything else (current servers) set it to 100ns.
*/
if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
((tcon->ses->capabilities &
tcon->ses->server->vals->cap_nt_find) == 0) &&