Commit 85a2ad15 authored by Dinu-Razvan Chis-Serban's avatar Dinu-Razvan Chis-Serban Committed by Greg Kroah-Hartman

9p locks: add mount option for lock retry interval

[ Upstream commit 5e172f75 ]

The default P9_LOCK_TIMEOUT can be too long for some users exporting
a local file system to a guest VM (30s), make this configurable at
mount time.

Link: http://lkml.kernel.org/r/1536295827-3181-1-git-send-email-asmadeus@codewreck.org
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195727Signed-off-by: default avatarDinu-Razvan Chis-Serban <justcsdr@gmail.com>
Signed-off-by: default avatarDominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent fdf0c593
......@@ -61,6 +61,8 @@ enum {
Opt_cache_loose, Opt_fscache, Opt_mmap,
/* Access options */
Opt_access, Opt_posixacl,
/* Lock timeout option */
Opt_locktimeout,
/* Error token */
Opt_err
};
......@@ -80,6 +82,7 @@ static const match_table_t tokens = {
{Opt_cachetag, "cachetag=%s"},
{Opt_access, "access=%s"},
{Opt_posixacl, "posixacl"},
{Opt_locktimeout, "locktimeout=%u"},
{Opt_err, NULL}
};
......@@ -187,6 +190,7 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
#ifdef CONFIG_9P_FSCACHE
v9ses->cachetag = NULL;
#endif
v9ses->session_lock_timeout = P9_LOCK_TIMEOUT;
if (!opts)
return 0;
......@@ -360,6 +364,23 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
#endif
break;
case Opt_locktimeout:
r = match_int(&args[0], &option);
if (r < 0) {
p9_debug(P9_DEBUG_ERROR,
"integer field, but no integer?\n");
ret = r;
continue;
}
if (option < 1) {
p9_debug(P9_DEBUG_ERROR,
"locktimeout must be a greater than zero integer.\n");
ret = -EINVAL;
continue;
}
v9ses->session_lock_timeout = (long)option * HZ;
break;
default:
continue;
}
......
......@@ -116,6 +116,7 @@ struct v9fs_session_info {
struct p9_client *clnt; /* 9p client */
struct list_head slist; /* list of sessions registered with v9fs */
struct rw_semaphore rename_sem;
long session_lock_timeout; /* retry interval for blocking locks */
};
/* cache_validity flags */
......
......@@ -154,6 +154,7 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
uint8_t status = P9_LOCK_ERROR;
int res = 0;
unsigned char fl_type;
struct v9fs_session_info *v9ses;
fid = filp->private_data;
BUG_ON(fid == NULL);
......@@ -189,6 +190,8 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
if (IS_SETLKW(cmd))
flock.flags = P9_LOCK_FLAGS_BLOCK;
v9ses = v9fs_inode2v9ses(file_inode(filp));
/*
* if its a blocked request and we get P9_LOCK_BLOCKED as the status
* for lock request, keep on trying
......@@ -202,7 +205,8 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
break;
if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
break;
if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
!= 0)
break;
/*
* p9_client_lock_dotl overwrites flock.client_id with the
......
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