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authorJeff Layton <jlayton@kernel.org>2019-04-02 15:35:56 -0400
committerIlya Dryomov <idryomov@gmail.com>2020-03-30 12:42:42 +0200
commit2ccb45462aeaf0831397b90d31d3d50a7704fa1f (patch)
treea2a9cb929402d939a9db386c7d0958985a685bbe /fs/ceph/super.c
parent173e70e8ac0f1e7e3eb98f1ffb953e80a5cc8a5f (diff)
downloadlinux-2ccb45462aeaf0831397b90d31d3d50a7704fa1f.tar.bz2
ceph: perform asynchronous unlink if we have sufficient caps
The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/super.c')
-rw-r--r--fs/ceph/super.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index b1329cd5388a..c9784eb1159a 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -155,6 +155,7 @@ enum {
Opt_acl,
Opt_quotadf,
Opt_copyfrom,
+ Opt_wsync,
};
enum ceph_recover_session_mode {
@@ -194,6 +195,7 @@ static const struct fs_parameter_spec ceph_mount_parameters[] = {
fsparam_string ("snapdirname", Opt_snapdirname),
fsparam_string ("source", Opt_source),
fsparam_u32 ("wsize", Opt_wsize),
+ fsparam_flag_no ("wsync", Opt_wsync),
{}
};
@@ -444,6 +446,12 @@ static int ceph_parse_mount_param(struct fs_context *fc,
fc->sb_flags &= ~SB_POSIXACL;
}
break;
+ case Opt_wsync:
+ if (!result.negated)
+ fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
+ else
+ fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
+ break;
default:
BUG();
}
@@ -567,6 +575,9 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
seq_show_option(m, "recover_session", "clean");
+ if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
+ seq_puts(m, ",nowsync");
+
if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
seq_printf(m, ",wsize=%u", fsopt->wsize);
if (fsopt->rsize != CEPH_MAX_READ_SIZE)
@@ -1115,6 +1126,15 @@ static void ceph_free_fc(struct fs_context *fc)
static int ceph_reconfigure_fc(struct fs_context *fc)
{
+ struct ceph_parse_opts_ctx *pctx = fc->fs_private;
+ struct ceph_mount_options *fsopt = pctx->opts;
+ struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb);
+
+ if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
+ ceph_set_mount_opt(fsc, ASYNC_DIROPS);
+ else
+ ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
+
sync_filesystem(fc->root->d_sb);
return 0;
}