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ceph: enable/disable dentry complete flags via mount option

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Enable/disable use of the dentry dir 'complete' flag via a mount option.
This lets the admin control whether ceph uses the dcache to satisfy
negative lookups or readdir when it has the entire directory contents in
its cache.

This is purely a performance optimization; correctness is guaranteed
whether it is enabled or not.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
2012-01-10 09:12:55 -08:00
parent 46f72b3492
commit a40dc6cc2e
4 changed files with 50 additions and 8 deletions
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14
fs/ceph/super.c
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@@ -131,6 +131,8 @@ enum {
Opt_rbytes,
Opt_norbytes,
Opt_noasyncreaddir,
Opt_dcache,
Opt_nodcache,
Opt_ino32,
};
@@ -152,6 +154,8 @@ static match_table_t fsopt_tokens = {
{Opt_rbytes, "rbytes"},
{Opt_norbytes, "norbytes"},
{Opt_noasyncreaddir, "noasyncreaddir"},
{Opt_dcache, "dcache"},
{Opt_nodcache, "nodcache"},
{Opt_ino32, "ino32"},
{-1, NULL}
};
@@ -231,6 +235,12 @@ static int parse_fsopt_token(char *c, void *private)
case Opt_noasyncreaddir:
fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
break;
case Opt_dcache:
fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
break;
case Opt_nodcache:
fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
break;
case Opt_ino32:
fsopt->flags |= CEPH_MOUNT_OPT_INO32;
break;
@@ -377,6 +387,10 @@ static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_puts(m, ",norbytes");
if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
seq_puts(m, ",noasyncreaddir");
if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
seq_puts(m, ",dcache");
else
seq_puts(m, ",nodcache");
if (fsopt->wsize)
seq_printf(m, ",wsize=%d", fsopt->wsize);