ceph: use pagelist to present MDS request data

Current code uses page array to present MDS request data. Pages in the
array are allocated/freed by caller of ceph_mdsc_do_request(). If request
is interrupted, the pages can be freed while they are still being used by
the request message.

The fix is use pagelist to present MDS request data. Pagelist is
reference counted.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

3 files changed, 28 insertions, 39 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index b4430ce1b3f6..f8f774e6f868 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -543,6 +543,8 @@ void ceph_mdsc_release_request(struct kref *kref)
         }
         kfree(req->r_path1);
         kfree(req->r_path2);
+        if (req->r_pagelist)
+                ceph_pagelist_release(req->r_pagelist);
         put_request_session(req);
         ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
         kfree(req);
@@ -1916,13 +1918,15 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
         msg->front.iov_len = p - msg->front.iov_base;
         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
 
-        if (req->r_data_len) {
-                /* outbound data set only by ceph_sync_setxattr() */
-                BUG_ON(!req->r_pages);
-                ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
+        if (req->r_pagelist) {
+                struct ceph_pagelist *pagelist = req->r_pagelist;
+                atomic_inc(&pagelist->refcnt);
+                ceph_msg_data_add_pagelist(msg, pagelist);
+                msg->hdr.data_len = cpu_to_le32(pagelist->length);
+        } else {
+                msg->hdr.data_len = 0;
         }
 
-        msg->hdr.data_len = cpu_to_le32(req->r_data_len);
         msg->hdr.data_off = cpu_to_le16(0);
 
 out_free2:
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index e00737cf523c..23015f747061 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -202,9 +202,7 @@ struct ceph_mds_request {
         bool r_direct_is_hash;  /* true if r_direct_hash is valid */
 
         /* data payload is used for xattr ops */
-        struct page **r_pages;
-        int r_num_pages;
-        int r_data_len;
+        struct ceph_pagelist *r_pagelist;
 
         /* what caps shall we drop? */
         int r_inode_drop, r_inode_unless;
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 19da5026c38f..678b0d2bbbc4 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1,4 +1,5 @@
 #include <linux/ceph/ceph_debug.h>
+#include <linux/ceph/pagelist.h>
 
 #include "super.h"
 #include "mds_client.h"
@@ -850,35 +851,25 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
         struct ceph_inode_info *ci = ceph_inode(inode);
         struct ceph_mds_request *req;
         struct ceph_mds_client *mdsc = fsc->mdsc;
+        struct ceph_pagelist *pagelist = NULL;
         int err;
-        int i, nr_pages;
-        struct page **pages = NULL;
-        void *kaddr;
-
-        /* copy value into some pages */
-        nr_pages = calc_pages_for(0, size);
-        if (nr_pages) {
-                pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
-                if (!pages)
+
+        if (value) {
+                /* copy value into pagelist */
+                pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
+                if (!pagelist)
                         return -ENOMEM;
-                err = -ENOMEM;
-                for (i = 0; i < nr_pages; i++) {
-                        pages[i] = __page_cache_alloc(GFP_NOFS);
-                        if (!pages[i]) {
-                                nr_pages = i;
-                                goto out;
-                        }
-                        kaddr = kmap(pages[i]);
-                        memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
-                               min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
-                }
+
+                ceph_pagelist_init(pagelist);
+                err = ceph_pagelist_append(pagelist, value, size);
+                if (err)
+                        goto out;
+        } else {
+                flags |= CEPH_XATTR_REMOVE;
         }
 
         dout("setxattr value=%.*s\n", (int)size, value);
 
-        if (!value)
-                flags |= CEPH_XATTR_REMOVE;
-
         /* do request */
         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
                                        USE_AUTH_MDS);
@@ -893,9 +884,8 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
         req->r_args.setxattr.flags = cpu_to_le32(flags);
         req->r_path2 = kstrdup(name, GFP_NOFS);
 
-        req->r_pages = pages;
-        req->r_num_pages = nr_pages;
-        req->r_data_len = size;
+        req->r_pagelist = pagelist;
+        pagelist = NULL;
 
         dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
         err = ceph_mdsc_do_request(mdsc, NULL, req);
@@ -903,11 +893,8 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
         dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
 
 out:
-        if (pages) {
-                for (i = 0; i < nr_pages; i++)
-                        __free_page(pages[i]);
-                kfree(pages);
-        }
+        if (pagelist)
+                ceph_pagelist_release(pagelist);
         return err;
 }