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ceph: fix request max size

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ceph_check_caps() requests new max size only when there is Fw cap.
If we call check_max_size() while there is no Fw cap. It updates
i_wanted_max_size and calls ceph_check_caps(), but ceph_check_caps()
does nothing. Later when Fw cap is issued, we call check_max_size()
again. But i_wanted_max_size is equal to 'endoff' at this time, so
check_max_size() doesn't call ceph_check_caps() and we end up with
waiting for the new max size forever.

The fix is duplicate ceph_check_caps()'s "request max size" code in
check_max_size(), and make try_get_cap_refs() wait for the Fw cap
before retry requesting new max size.

This patch also removes the "endoff > (inode->i_size << 1)" check
in check_max_size(). It's useless because there is no corresponding
logic in ceph_check_caps().

Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2013-08-05 14:10:29 +08:00 committed by Sage Weil
parent b0d7c22310
commit 3871cbb9a4
1 changed files with 11 additions and 7 deletions
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18
fs/ceph/caps.c
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@ -2076,11 +2076,13 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
spin_lock(&ci->i_ceph_lock);
}
if (need & CEPH_CAP_FILE_WR) {
have = __ceph_caps_issued(ci, &implemented);
if (have & need & CEPH_CAP_FILE_WR) {
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
inode, endoff, ci->i_max_size);
if (endoff > ci->i_wanted_max_size) {
if (endoff > ci->i_requested_max_size) {
*check_max = 1;
ret = 1;
}
@ -2095,7 +2097,6 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
goto out;
}
}
have = __ceph_caps_issued(ci, &implemented);
if ((have & need) == need) {
/*
@ -2137,14 +2138,17 @@ static void check_max_size(struct inode *inode, loff_t endoff)
/* do we need to explicitly request a larger max_size? */
spin_lock(&ci->i_ceph_lock);
if ((endoff >= ci->i_max_size ||
endoff > (inode->i_size << 1)) &&
endoff > ci->i_wanted_max_size) {
if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
dout("write %p at large endoff %llu, req max_size\n",
inode, endoff);
ci->i_wanted_max_size = endoff;
check = 1;
}
/* duplicate ceph_check_caps()'s logic */
if (ci->i_auth_cap &&
(ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
ci->i_wanted_max_size > ci->i_max_size &&
ci->i_wanted_max_size > ci->i_requested_max_size)
check = 1;
spin_unlock(&ci->i_ceph_lock);
if (check)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);