NFS: Allow the "nfs" file system type to support NFSv4

[pandora-kernel.git] / fs / nfs / inode.c

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index bd7938e..060022b 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -46,6 +46,7 @@
 #include "iostat.h"
 #include "internal.h"
 #include "fscache.h"
+#include "dns_resolve.h"
 
 #define NFSDBG_FACILITY                NFSDBG_VFS
 
@@ -286,6 +287,11 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
                /* We can't support update_atime(), since the server will reset it */
                inode->i_flags |= S_NOATIME|S_NOCMTIME;
                inode->i_mode = fattr->mode;
+               if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
+                               && nfs_server_capable(inode, NFS_CAP_MODE))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL;
                /* Why so? Because we want revalidate for devices/FIFOs, and
                 * that's precisely what we have in nfs_file_inode_operations.
                 */
@@ -330,20 +336,46 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
                nfsi->attr_gencount = fattr->gencount;
                if (fattr->valid & NFS_ATTR_FATTR_ATIME)
                        inode->i_atime = fattr->atime;
+               else if (nfs_server_capable(inode, NFS_CAP_ATIME))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
                if (fattr->valid & NFS_ATTR_FATTR_MTIME)
                        inode->i_mtime = fattr->mtime;
+               else if (nfs_server_capable(inode, NFS_CAP_MTIME))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_DATA;
                if (fattr->valid & NFS_ATTR_FATTR_CTIME)
                        inode->i_ctime = fattr->ctime;
+               else if (nfs_server_capable(inode, NFS_CAP_CTIME))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL;
                if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
                        nfsi->change_attr = fattr->change_attr;
+               else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_DATA;
                if (fattr->valid & NFS_ATTR_FATTR_SIZE)
                        inode->i_size = nfs_size_to_loff_t(fattr->size);
+               else
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_DATA
+                               | NFS_INO_REVAL_PAGECACHE;
                if (fattr->valid & NFS_ATTR_FATTR_NLINK)
                        inode->i_nlink = fattr->nlink;
+               else if (nfs_server_capable(inode, NFS_CAP_NLINK))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
                if (fattr->valid & NFS_ATTR_FATTR_OWNER)
                        inode->i_uid = fattr->uid;
+               else if (nfs_server_capable(inode, NFS_CAP_OWNER))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL;
                if (fattr->valid & NFS_ATTR_FATTR_GROUP)
                        inode->i_gid = fattr->gid;
+               else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
+                       nfsi->cache_validity |= NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL;
                if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
                        inode->i_blocks = fattr->du.nfs2.blocks;
                if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
@@ -1145,6 +1177,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        loff_t cur_isize, new_isize;
        unsigned long invalid = 0;
        unsigned long now = jiffies;
+       unsigned long save_cache_validity;
 
        dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
                        __func__, inode->i_sb->s_id, inode->i_ino,
@@ -1171,10 +1204,11 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
         */
        nfsi->read_cache_jiffies = fattr->time_start;
 
-       if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) || (fattr->valid & (NFS_ATTR_FATTR_MTIME|NFS_ATTR_FATTR_CTIME)))
-           nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
-                   | NFS_INO_INVALID_ATIME
-                   | NFS_INO_REVAL_PAGECACHE);
+       save_cache_validity = nfsi->cache_validity;
+       nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
+                       | NFS_INO_INVALID_ATIME
+                       | NFS_INO_REVAL_FORCED
+                       | NFS_INO_REVAL_PAGECACHE);
 
        /* Do atomic weak cache consistency updates */
        nfs_wcc_update_inode(inode, fattr);
@@ -1189,7 +1223,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                nfs_force_lookup_revalidate(inode);
                        nfsi->change_attr = fattr->change_attr;
                }
-       }
+       } else if (server->caps & NFS_CAP_CHANGE_ATTR)
+               invalid |= save_cache_validity;
 
        if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
                /* NFSv2/v3: Check if the mtime agrees */
@@ -1201,7 +1236,12 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                nfs_force_lookup_revalidate(inode);
                        memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
                }
-       }
+       } else if (server->caps & NFS_CAP_MTIME)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_DATA
+                               | NFS_INO_REVAL_PAGECACHE
+                               | NFS_INO_REVAL_FORCED);
+
        if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
                /* If ctime has changed we should definitely clear access+acl caches */
                if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
@@ -1215,7 +1255,11 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                        }
                        memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
                }
-       }
+       } else if (server->caps & NFS_CAP_CTIME)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL
+                               | NFS_INO_REVAL_FORCED);
 
        /* Check if our cached file size is stale */
        if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
@@ -1231,30 +1275,50 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                        dprintk("NFS: isize change on server for file %s/%ld\n",
                                        inode->i_sb->s_id, inode->i_ino);
                }
-       }
+       } else
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_REVAL_PAGECACHE
+                               | NFS_INO_REVAL_FORCED);
 
 
        if (fattr->valid & NFS_ATTR_FATTR_ATIME)
                memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
+       else if (server->caps & NFS_CAP_ATIME)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
+                               | NFS_INO_REVAL_FORCED);
 
        if (fattr->valid & NFS_ATTR_FATTR_MODE) {
                if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
                        invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
                        inode->i_mode = fattr->mode;
                }
-       }
+       } else if (server->caps & NFS_CAP_MODE)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL
+                               | NFS_INO_REVAL_FORCED);
+
        if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
                if (inode->i_uid != fattr->uid) {
                        invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
                        inode->i_uid = fattr->uid;
                }
-       }
+       } else if (server->caps & NFS_CAP_OWNER)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL
+                               | NFS_INO_REVAL_FORCED);
+
        if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
                if (inode->i_gid != fattr->gid) {
                        invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
                        inode->i_gid = fattr->gid;
                }
-       }
+       } else if (server->caps & NFS_CAP_OWNER_GROUP)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_INVALID_ACCESS
+                               | NFS_INO_INVALID_ACL
+                               | NFS_INO_REVAL_FORCED);
 
        if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
                if (inode->i_nlink != fattr->nlink) {
@@ -1263,7 +1327,9 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                invalid |= NFS_INO_INVALID_DATA;
                        inode->i_nlink = fattr->nlink;
                }
-       }
+       } else if (server->caps & NFS_CAP_NLINK)
+               invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
+                               | NFS_INO_REVAL_FORCED);
 
        if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
                /*
@@ -1293,9 +1359,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                || S_ISLNK(inode->i_mode)))
                invalid &= ~NFS_INO_INVALID_DATA;
        if (!nfs_have_delegation(inode, FMODE_READ) ||
-                       (nfsi->cache_validity & NFS_INO_REVAL_FORCED))
+                       (save_cache_validity & NFS_INO_REVAL_FORCED))
                nfsi->cache_validity |= invalid;
-       nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
 
        return 0;
  out_changed:
@@ -1442,6 +1507,10 @@ static int __init init_nfs_fs(void)
 {
        int err;
 
+       err = nfs_dns_resolver_init();
+       if (err < 0)
+               goto out8;
+
        err = nfs_fscache_register();
        if (err < 0)
                goto out7;
@@ -1500,6 +1569,8 @@ out5:
 out6:
        nfs_fscache_unregister();
 out7:
+       nfs_dns_resolver_destroy();
+out8:
        return err;
 }
 
@@ -1511,6 +1582,7 @@ static void __exit exit_nfs_fs(void)
        nfs_destroy_inodecache();
        nfs_destroy_nfspagecache();
        nfs_fscache_unregister();
+       nfs_dns_resolver_destroy();
 #ifdef CONFIG_PROC_FS
        rpc_proc_unregister("nfs");
 #endif