b7fa0554cf
This adds acl support fo nfs clients via the NFSACL protocol extension, by implementing the getxattr, listxattr, setxattr, and removexattr iops for the system.posix_acl_access and system.posix_acl_default attributes. This patch implements a dumb version that uses no caching (and thus adds some overhead). (Another patch in this patchset adds caching as well.) Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Olaf Kirch <okir@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
304 lines
6.7 KiB
C
304 lines
6.7 KiB
C
#include <linux/fs.h>
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#include <linux/nfs.h>
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#include <linux/nfs3.h>
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#include <linux/nfs_fs.h>
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#include <linux/xattr_acl.h>
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#include <linux/nfsacl.h>
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#define NFSDBG_FACILITY NFSDBG_PROC
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ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
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{
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struct inode *inode = dentry->d_inode;
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struct posix_acl *acl;
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int pos=0, len=0;
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# define output(s) do { \
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if (pos + sizeof(s) <= size) { \
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memcpy(buffer + pos, s, sizeof(s)); \
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pos += sizeof(s); \
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} \
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len += sizeof(s); \
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} while(0)
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acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl) {
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output("system.posix_acl_access");
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posix_acl_release(acl);
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}
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if (S_ISDIR(inode->i_mode)) {
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acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl) {
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output("system.posix_acl_default");
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posix_acl_release(acl);
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}
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}
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# undef output
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if (!buffer || len <= size)
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return len;
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return -ERANGE;
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}
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ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
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void *buffer, size_t size)
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{
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struct inode *inode = dentry->d_inode;
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struct posix_acl *acl;
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int type, error = 0;
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if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
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type = ACL_TYPE_ACCESS;
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else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
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type = ACL_TYPE_DEFAULT;
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else
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return -EOPNOTSUPP;
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acl = nfs3_proc_getacl(inode, type);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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else if (acl) {
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if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
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error = -ENODATA;
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else
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error = posix_acl_to_xattr(acl, buffer, size);
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posix_acl_release(acl);
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} else
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error = -ENODATA;
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return error;
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}
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int nfs3_setxattr(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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struct inode *inode = dentry->d_inode;
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struct posix_acl *acl;
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int type, error;
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if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
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type = ACL_TYPE_ACCESS;
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else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
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type = ACL_TYPE_DEFAULT;
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else
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return -EOPNOTSUPP;
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acl = posix_acl_from_xattr(value, size);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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error = nfs3_proc_setacl(inode, type, acl);
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posix_acl_release(acl);
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return error;
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}
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int nfs3_removexattr(struct dentry *dentry, const char *name)
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{
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struct inode *inode = dentry->d_inode;
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int type;
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if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
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type = ACL_TYPE_ACCESS;
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else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
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type = ACL_TYPE_DEFAULT;
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else
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return -EOPNOTSUPP;
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return nfs3_proc_setacl(inode, type, NULL);
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}
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struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_fattr fattr;
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struct page *pages[NFSACL_MAXPAGES] = { };
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struct nfs3_getaclargs args = {
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.fh = NFS_FH(inode),
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/* The xdr layer may allocate pages here. */
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.pages = pages,
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};
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struct nfs3_getaclres res = {
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.fattr = &fattr,
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};
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struct posix_acl *acl = NULL;
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int status, count;
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if (!nfs_server_capable(inode, NFS_CAP_ACLS))
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return ERR_PTR(-EOPNOTSUPP);
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switch (type) {
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case ACL_TYPE_ACCESS:
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args.mask = NFS_ACLCNT|NFS_ACL;
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode))
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return NULL;
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args.mask = NFS_DFACLCNT|NFS_DFACL;
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break;
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default:
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return ERR_PTR(-EINVAL);
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}
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dprintk("NFS call getacl\n");
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status = rpc_call(server->client_acl, ACLPROC3_GETACL,
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&args, &res, 0);
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dprintk("NFS reply getacl: %d\n", status);
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/* pages may have been allocated at the xdr layer. */
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for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
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__free_page(args.pages[count]);
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switch (status) {
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case 0:
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status = nfs_refresh_inode(inode, &fattr);
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break;
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case -EPFNOSUPPORT:
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case -EPROTONOSUPPORT:
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dprintk("NFS_V3_ACL extension not supported; disabling\n");
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server->caps &= ~NFS_CAP_ACLS;
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case -ENOTSUPP:
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status = -EOPNOTSUPP;
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default:
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goto getout;
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}
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if ((args.mask & res.mask) != args.mask) {
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status = -EIO;
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goto getout;
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}
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if (res.acl_access != NULL) {
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if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
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posix_acl_release(res.acl_access);
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res.acl_access = NULL;
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}
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}
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switch(type) {
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case ACL_TYPE_ACCESS:
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acl = res.acl_access;
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res.acl_access = NULL;
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break;
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case ACL_TYPE_DEFAULT:
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acl = res.acl_default;
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res.acl_default = NULL;
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}
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getout:
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posix_acl_release(res.acl_access);
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posix_acl_release(res.acl_default);
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if (status != 0) {
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posix_acl_release(acl);
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acl = ERR_PTR(status);
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}
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return acl;
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}
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static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
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struct posix_acl *dfacl)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_fattr fattr;
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struct page *pages[NFSACL_MAXPAGES] = { };
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struct nfs3_setaclargs args = {
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.inode = inode,
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.mask = NFS_ACL,
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.acl_access = acl,
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.pages = pages,
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};
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int status, count;
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status = -EOPNOTSUPP;
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if (!nfs_server_capable(inode, NFS_CAP_ACLS))
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goto out;
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/* We are doing this here, because XDR marshalling can only
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return -ENOMEM. */
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status = -ENOSPC;
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if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
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goto out;
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if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
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goto out;
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if (S_ISDIR(inode->i_mode)) {
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args.mask |= NFS_DFACL;
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args.acl_default = dfacl;
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}
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dprintk("NFS call setacl\n");
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nfs_begin_data_update(inode);
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status = rpc_call(server->client_acl, ACLPROC3_SETACL,
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&args, &fattr, 0);
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NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
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nfs_end_data_update(inode);
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dprintk("NFS reply setacl: %d\n", status);
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/* pages may have been allocated at the xdr layer. */
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for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
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__free_page(args.pages[count]);
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switch (status) {
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case 0:
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status = nfs_refresh_inode(inode, &fattr);
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break;
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case -EPFNOSUPPORT:
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case -EPROTONOSUPPORT:
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dprintk("NFS_V3_ACL SETACL RPC not supported"
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"(will not retry)\n");
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server->caps &= ~NFS_CAP_ACLS;
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case -ENOTSUPP:
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status = -EOPNOTSUPP;
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}
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out:
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return status;
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}
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int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
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{
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struct posix_acl *alloc = NULL, *dfacl = NULL;
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int status;
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if (S_ISDIR(inode->i_mode)) {
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switch(type) {
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case ACL_TYPE_ACCESS:
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alloc = dfacl = nfs3_proc_getacl(inode,
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ACL_TYPE_DEFAULT);
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if (IS_ERR(alloc))
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goto fail;
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break;
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case ACL_TYPE_DEFAULT:
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dfacl = acl;
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alloc = acl = nfs3_proc_getacl(inode,
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ACL_TYPE_ACCESS);
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if (IS_ERR(alloc))
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goto fail;
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break;
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default:
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return -EINVAL;
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}
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} else if (type != ACL_TYPE_ACCESS)
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return -EINVAL;
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if (acl == NULL) {
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alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
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if (IS_ERR(alloc))
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goto fail;
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}
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status = nfs3_proc_setacls(inode, acl, dfacl);
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posix_acl_release(alloc);
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return status;
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fail:
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return PTR_ERR(alloc);
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}
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