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ceph: voluntarily drop Ax cap for requests that create new inode 

MDS need to rdlock directory inode's authlock when handling these
requests. Voluntarily dropping CEPH_CAP_AUTH_EXCL avoids a cap revoke
message.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2017-11-23 17:47:15 +08:00 committed by Ilya Dryomov
parent e573427a44
commit 222b7f90ba
3 changed files with 19 additions and 10 deletions
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21
fs/ceph/caps.c
View File

@ -3939,11 +3939,20 @@ int ceph_encode_inode_release(void **p, struct inode *inode,
cap = __get_cap_for_mds(ci, mds);
if (cap && __cap_is_valid(cap)) {
if (force ||
((cap->issued & drop) &&
(cap->issued & unless) == 0)) {
if ((cap->issued & drop) &&
(cap->issued & unless) == 0) {
unless &= cap->issued;
if (unless) {
if (unless & CEPH_CAP_AUTH_EXCL)
drop &= ~CEPH_CAP_AUTH_SHARED;
if (unless & CEPH_CAP_LINK_EXCL)
drop &= ~CEPH_CAP_LINK_SHARED;
if (unless & CEPH_CAP_XATTR_EXCL)
drop &= ~CEPH_CAP_XATTR_SHARED;
if (unless & CEPH_CAP_FILE_EXCL)
drop &= ~CEPH_CAP_FILE_SHARED;
}
if (force || (cap->issued & drop)) {
if (cap->issued & drop) {
int wanted = __ceph_caps_wanted(ci);
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
wanted |= cap->mds_wanted;
@ -3975,7 +3984,7 @@ int ceph_encode_inode_release(void **p, struct inode *inode,
*p += sizeof(*rel);
ret = 1;
} else {
dout("encode_inode_release %p cap %p %s\n",
dout("encode_inode_release %p cap %p %s (noop)\n",
inode, cap, ceph_cap_string(cap->issued));
}
}

6
fs/ceph/dir.c
View File

@ -835,7 +835,7 @@ static int ceph_mknod(struct inode *dir, struct dentry *dentry,
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
req->r_args.mknod.mode = cpu_to_le32(mode);
req->r_args.mknod.rdev = cpu_to_le32(rdev);
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
if (acls.pagelist) {
req->r_pagelist = acls.pagelist;
@ -887,7 +887,7 @@ static int ceph_symlink(struct inode *dir, struct dentry *dentry,
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
err = ceph_mdsc_do_request(mdsc, dir, req);
if (!err && !req->r_reply_info.head->is_dentry)
@ -936,7 +936,7 @@ static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
req->r_parent = dir;
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
req->r_args.mkdir.mode = cpu_to_le32(mode);
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
if (acls.pagelist) {
req->r_pagelist = acls.pagelist;

2
fs/ceph/file.c
View File

@ -396,7 +396,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
if (flags & O_CREAT) {
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
if (acls.pagelist) {
req->r_pagelist = acls.pagelist;