NFS: Prevent another deadlock in nfs_release_page()

[safe/jmp/linux-2.6] / fs / nfs / nfs3xdr.c

diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 11cddde..5fe5492 100644 (file)
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -10,7 +10,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
@@ -82,26 +81,24 @@
 #define NFS3_commitres_sz      (1+NFS3_wcc_data_sz+2)
 
 #define ACL3_getaclargs_sz     (NFS3_fh_sz+1)
-#define ACL3_setaclargs_sz     (NFS3_fh_sz+1+2*(2+5*3))
-#define ACL3_getaclres_sz      (1+NFS3_post_op_attr_sz+1+2*(2+5*3))
+#define ACL3_setaclargs_sz     (NFS3_fh_sz+1+ \
+                               XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
+#define ACL3_getaclres_sz      (1+NFS3_post_op_attr_sz+1+ \
+                               XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 #define ACL3_setaclres_sz      (1+NFS3_post_op_attr_sz)
 
 /*
  * Map file type to S_IFMT bits
  */
-static struct {
-       unsigned int    mode;
-       unsigned int    nfs2type;
-} nfs_type2fmt[] = {
-      { 0,             NFNON   },
-      { S_IFREG,       NFREG   },
-      { S_IFDIR,       NFDIR   },
-      { S_IFBLK,       NFBLK   },
-      { S_IFCHR,       NFCHR   },
-      { S_IFLNK,       NFLNK   },
-      { S_IFSOCK,      NFSOCK  },
-      { S_IFIFO,       NFFIFO  },
-      { 0,             NFBAD   }
+static const umode_t nfs_type2fmt[] = {
+       [NF3BAD] = 0,
+       [NF3REG] = S_IFREG,
+       [NF3DIR] = S_IFDIR,
+       [NF3BLK] = S_IFBLK,
+       [NF3CHR] = S_IFCHR,
+       [NF3LNK] = S_IFLNK,
+       [NF3SOCK] = S_IFSOCK,
+       [NF3FIFO] = S_IFIFO,
 };
 
 /*
@@ -146,13 +143,12 @@ static __be32 *
 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
 {
        unsigned int    type, major, minor;
-       int             fmode;
+       umode_t         fmode;
 
        type = ntohl(*p++);
-       if (type >= NF3BAD)
-               type = NF3BAD;
-       fmode = nfs_type2fmt[type].mode;
-       fattr->type = nfs_type2fmt[type].nfs2type;
+       if (type > NF3FIFO)
+               type = NF3NON;
+       fmode = nfs_type2fmt[type];
        fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
        fattr->nlink = ntohl(*p++);
        fattr->uid = ntohl(*p++);
@@ -175,7 +171,7 @@ xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
        p = xdr_decode_time3(p, &fattr->ctime);
 
        /* Update the mode bits */
-       fattr->valid |= (NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3);
+       fattr->valid |= NFS_ATTR_FATTR_V3;
        return p;
 }
 
@@ -231,7 +227,9 @@ xdr_decode_wcc_attr(__be32 *p, struct nfs_fattr *fattr)
        p = xdr_decode_hyper(p, &fattr->pre_size);
        p = xdr_decode_time3(p, &fattr->pre_mtime);
        p = xdr_decode_time3(p, &fattr->pre_ctime);
-       fattr->valid |= NFS_ATTR_WCC;
+       fattr->valid |= NFS_ATTR_FATTR_PRESIZE
+               | NFS_ATTR_FATTR_PREMTIME
+               | NFS_ATTR_FATTR_PRECTIME;
        return p;
 }
 
@@ -703,28 +701,19 @@ nfs3_xdr_setaclargs(struct rpc_rqst *req, __be32 *p,
                    struct nfs3_setaclargs *args)
 {
        struct xdr_buf *buf = &req->rq_snd_buf;
-       unsigned int base, len_in_head, len = nfsacl_size(
-               (args->mask & NFS_ACL)   ? args->acl_access  : NULL,
-               (args->mask & NFS_DFACL) ? args->acl_default : NULL);
-       int count, err;
+       unsigned int base;
+       int err;
 
        p = xdr_encode_fhandle(p, NFS_FH(args->inode));
        *p++ = htonl(args->mask);
-       base = (char *)p - (char *)buf->head->iov_base;
-       /* put as much of the acls into head as possible. */
-       len_in_head = min_t(unsigned int, buf->head->iov_len - base, len);
-       len -= len_in_head;
-       req->rq_slen = xdr_adjust_iovec(req->rq_svec, p + (len_in_head >> 2));
-
-       for (count = 0; (count << PAGE_SHIFT) < len; count++) {
-               args->pages[count] = alloc_page(GFP_KERNEL);
-               if (!args->pages[count]) {
-                       while (count)
-                               __free_page(args->pages[--count]);
-                       return -ENOMEM;
-               }
-       }
-       xdr_encode_pages(buf, args->pages, 0, len);
+       req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+       base = req->rq_slen;
+
+       if (args->npages != 0)
+               xdr_encode_pages(buf, args->pages, 0, args->len);
+       else
+               req->rq_slen = xdr_adjust_iovec(req->rq_svec,
+                               p + XDR_QUADLEN(args->len));
 
        err = nfsacl_encode(buf, base, args->inode,
                            (args->mask & NFS_ACL) ?