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| author | Ilya Dryomov <idryomov@gmail.com> | 2015-05-15 11:02:17 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2015-06-25 10:49:29 +0200 |
| commit | a319bf56a617354e62cf5f774d2ca4e1a8a3bff3 (patch) | |
| tree | cf54ed20b02c8488a342f54fd573eb57df964a3c /fs/ceph/dir.c | |
| parent | libceph: nuke time_sub() (diff) | |
| download | linux-a319bf56a617354e62cf5f774d2ca4e1a8a3bff3.tar.xz linux-a319bf56a617354e62cf5f774d2ca4e1a8a3bff3.zip | |
libceph: store timeouts in jiffies, verify user input
There are currently three libceph-level timeouts that the user can
specify on mount: mount_timeout, osd_idle_ttl and osdkeepalive. All of
these are in seconds and no checking is done on user input: negative
values are accepted, we multiply them all by HZ which may or may not
overflow, arbitrarily large jiffies then get added together, etc.
There is also a bug in the way mount_timeout=0 is handled. It's
supposed to mean "infinite timeout", but that's not how wait.h APIs
treat it and so __ceph_open_session() for example will busy loop
without much chance of being interrupted if none of ceph-mons are
there.
Fix all this by verifying user input, storing timeouts capped by
msecs_to_jiffies() in jiffies and using the new ceph_timeout_jiffies()
helper for all user-specified waits to handle infinite timeouts
correctly.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Diffstat (limited to 'fs/ceph/dir.c')
| -rw-r--r-- | fs/ceph/dir.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 4248307fea90..173dd4b58c71 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1259,8 +1259,8 @@ static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, inode, req->r_tid, last_tid); if (req->r_timeout) { unsigned long time_left = wait_for_completion_timeout( - &req->r_safe_completion, - req->r_timeout); + &req->r_safe_completion, + ceph_timeout_jiffies(req->r_timeout)); if (time_left > 0) ret = 0; else |