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ceph: clean up handle_cap_grant, handle_caps wrt session mutex 

Drop session mutex unconditionally in handle_cap_grant, and do the
check_caps from the handle_cap_grant helper.  This avoids using a magic
return value.

Also avoid using a flag variable in the IMPORT case and call
check_caps at the appropriate point.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-16 13:42:00 -07:00
parent cdc2ce056a
commit 15637c8b12
1 changed files with 25 additions and 32 deletions
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57
fs/ceph/caps.c
View File

@ -2195,18 +2195,19 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
* Handle a cap GRANT message from the MDS. (Note that a GRANT may
* actually be a revocation if it specifies a smaller cap set.)
*
* caller holds s_mutex.
* caller holds s_mutex and i_lock, we drop both.
*
* return value:
* 0 - ok
* 1 - check_caps on auth cap only (writeback)
* 2 - check_caps (ack revoke)
*/
static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
struct ceph_mds_session *session,
struct ceph_cap *cap,
struct ceph_buffer *xattr_buf)
static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
struct ceph_mds_session *session,
struct ceph_cap *cap,
struct ceph_buffer *xattr_buf)
__releases(inode->i_lock)
__releases(session->s_mutex)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int mds = session->s_mds;
@ -2216,7 +2217,7 @@ static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
u64 size = le64_to_cpu(grant->size);
u64 max_size = le64_to_cpu(grant->max_size);
struct timespec mtime, atime, ctime;
int reply = 0;
int check_caps = 0;
int wake = 0;
int writeback = 0;
int revoked_rdcache = 0;
@ -2329,10 +2330,10 @@ static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
if ((used & ~newcaps) & CEPH_CAP_FILE_BUFFER)
writeback = 1; /* will delay ack */
else if (dirty & ~newcaps)
reply = 1; /* initiate writeback in check_caps */
check_caps = 1; /* initiate writeback in check_caps */
else if (((used & ~newcaps) & CEPH_CAP_FILE_CACHE) == 0 ||
revoked_rdcache)
reply = 2; /* send revoke ack in check_caps */
check_caps = 2; /* send revoke ack in check_caps */
cap->issued = newcaps;
cap->implemented |= newcaps;
} else if (cap->issued == newcaps) {
@ -2361,7 +2362,14 @@ static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ceph_queue_invalidate(inode);
if (wake)
wake_up(&ci->i_cap_wq);
return reply;
if (check_caps == 1)
ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
session);
else if (check_caps == 2)
ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
else
mutex_unlock(&session->s_mutex);
}
/*
@ -2622,9 +2630,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
u64 cap_id;
u64 size, max_size;
u64 tid;
int check_caps = 0;
void *snaptrace;
int r;
dout("handle_caps from mds%d\n", mds);
@ -2669,8 +2675,9 @@ void ceph_handle_caps(struct ceph_mds_session *session,
case CEPH_CAP_OP_IMPORT:
handle_cap_import(mdsc, inode, h, session,
snaptrace, le32_to_cpu(h->snap_trace_len));
check_caps = 1; /* we may have sent a RELEASE to the old auth */
goto done;
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_NODELAY,
session);
goto done_unlocked;
}
/* the rest require a cap */
@ -2687,19 +2694,8 @@ void ceph_handle_caps(struct ceph_mds_session *session,
switch (op) {
case CEPH_CAP_OP_REVOKE:
case CEPH_CAP_OP_GRANT:
r = handle_cap_grant(inode, h, session, cap, msg->middle);
if (r == 1) {
ceph_check_caps(ceph_inode(inode),
CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
session);
session = NULL;
} else if (r == 2) {
ceph_check_caps(ceph_inode(inode),
CHECK_CAPS_NODELAY,
session);
session = NULL;
}
break;
handle_cap_grant(inode, h, session, cap, msg->middle);
goto done_unlocked;
case CEPH_CAP_OP_FLUSH_ACK:
handle_cap_flush_ack(inode, tid, h, session, cap);
@ -2716,11 +2712,8 @@ void ceph_handle_caps(struct ceph_mds_session *session,
}
done:
if (session)
mutex_unlock(&session->s_mutex);
if (check_caps)
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_NODELAY, NULL);
mutex_unlock(&session->s_mutex);
done_unlocked:
if (inode)
iput(inode);
return;