#include <linux/fs.h> #include <linux/gfp.h> #include <linux/nfs.h> #include <linux/nfs3.h> #include <linux/nfs_fs.h> #include <linux/posix_acl_xattr.h> #include <linux/nfsacl.h> #include "internal.h" #define NFSDBG_FACILITY NFSDBG_PROC ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size) { struct inode *inode = dentry->d_inode; struct posix_acl *acl; int pos=0, len=0; # define output(s) do { \ if (pos + sizeof(s) <= size) { \ memcpy(buffer + pos, s, sizeof(s)); \ pos += sizeof(s); \ } \ len += sizeof(s); \ } while(0) acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { output("system.posix_acl_access"); posix_acl_release(acl); } if (S_ISDIR(inode->i_mode)) { acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { output("system.posix_acl_default"); posix_acl_release(acl); } } # undef output if (!buffer || len <= size) return len; return -ERANGE; } ssize_t nfs3_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size) { struct inode *inode = dentry->d_inode; struct posix_acl *acl; int type, error = 0; if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) type = ACL_TYPE_ACCESS; else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) type = ACL_TYPE_DEFAULT; else return -EOPNOTSUPP; acl = nfs3_proc_getacl(inode, type); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { if (type == ACL_TYPE_ACCESS && acl->a_count == 0) error = -ENODATA; else error = posix_acl_to_xattr(acl, buffer, size); posix_acl_release(acl); } else error = -ENODATA; return error; } int nfs3_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct inode *inode = dentry->d_inode; struct posix_acl *acl; int type, error; if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) type = ACL_TYPE_ACCESS; else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) type = ACL_TYPE_DEFAULT; else return -EOPNOTSUPP; acl = posix_acl_from_xattr(value, size); if (IS_ERR(acl)) return PTR_ERR(acl); error = nfs3_proc_setacl(inode, type, acl); posix_acl_release(acl); return error; } int nfs3_removexattr(struct dentry *dentry, const char *name) { struct inode *inode = dentry->d_inode; int type; if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) type = ACL_TYPE_ACCESS; else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) type = ACL_TYPE_DEFAULT; else return -EOPNOTSUPP; return nfs3_proc_setacl(inode, type, NULL); } static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi) { if (!IS_ERR(nfsi->acl_access)) { posix_acl_release(nfsi->acl_access); nfsi->acl_access = ERR_PTR(-EAGAIN); } if (!IS_ERR(nfsi->acl_default)) { posix_acl_release(nfsi->acl_default); nfsi->acl_default = ERR_PTR(-EAGAIN); } } void nfs3_forget_cached_acls(struct inode *inode) { dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); spin_lock(&inode->i_lock); __nfs3_forget_cached_acls(NFS_I(inode)); spin_unlock(&inode->i_lock); } static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type) { struct nfs_inode *nfsi = NFS_I(inode); struct posix_acl *acl = ERR_PTR(-EINVAL); spin_lock(&inode->i_lock); switch(type) { case ACL_TYPE_ACCESS: acl = nfsi->acl_access; break; case ACL_TYPE_DEFAULT: acl = nfsi->acl_default; break; default: goto out; } if (IS_ERR(acl)) acl = ERR_PTR(-EAGAIN); else acl = posix_acl_dup(acl); out: spin_unlock(&inode->i_lock); dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id, inode->i_ino, type, acl); return acl; } static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl, struct posix_acl *dfacl) { struct nfs_inode *nfsi = NFS_I(inode); dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id, inode->i_ino, acl, dfacl); spin_lock(&inode->i_lock); __nfs3_forget_cached_acls(NFS_I(inode)); if (!IS_ERR(acl)) nfsi->acl_access = posix_acl_dup(acl); if (!IS_ERR(dfacl)) nfsi->acl_default = posix_acl_dup(dfacl); spin_unlock(&inode->i_lock); } struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type) { struct nfs_server *server = NFS_SERVER(inode); struct page *pages[NFSACL_MAXPAGES] = { }; struct nfs3_getaclargs args = { .fh = NFS_FH(inode), /* The xdr layer may allocate pages here. */ .pages = pages, }; struct nfs3_getaclres res = { 0 }; struct rpc_message msg = { .rpc_argp = &args, .rpc_resp = &res, }; struct posix_acl *acl; int status, count; if (!nfs_server_capable(inode, NFS_CAP_ACLS)) return ERR_PTR(-EOPNOTSUPP); status = nfs_revalidate_inode(server, inode); if (status < 0) return ERR_PTR(status); acl = nfs3_get_cached_acl(inode, type); if (acl != ERR_PTR(-EAGAIN)) return acl; acl = NULL; /* * Only get the access acl when explicitly requested: We don't * need it for access decisions, and only some applications use * it. Applications which request the access acl first are not * penalized from this optimization. */ if (type == ACL_TYPE_ACCESS) args.mask |= NFS_ACLCNT|NFS_ACL; if (S_ISDIR(inode->i_mode)) args.mask |= NFS_DFACLCNT|NFS_DFACL; if (args.mask == 0) return NULL; dprintk("NFS call getacl\n"); msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; res.fattr = nfs_alloc_fattr(); if (res.fattr == NULL) return ERR_PTR(-ENOMEM); status = rpc_call_sync(server->client_acl, &msg, 0); dprintk("NFS reply getacl: %d\n", status); /* pages may have been allocated at the xdr layer. */ for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) __free_page(args.pages[count]); switch (status) { case 0: status = nfs_refresh_inode(inode, res.fattr); break; case -EPFNOSUPPORT: case -EPROTONOSUPPORT: dprintk("NFS_V3_ACL extension not supported; disabling\n"); server->caps &= ~NFS_CAP_ACLS; case -ENOTSUPP: status = -EOPNOTSUPP; default: goto getout; } if ((args.mask & res.mask) != args.mask) { status = -EIO; goto getout; } if (res.acl_access != NULL) { if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) { posix_acl_release(res.acl_access); res.acl_access = NULL; } } nfs3_cache_acls(inode, (res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL), (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL)); switch(type) { case ACL_TYPE_ACCESS: acl = res.acl_access; res.acl_access = NULL; break; case ACL_TYPE_DEFAULT: acl = res.acl_default; res.acl_default = NULL; } getout: posix_acl_release(res.acl_access); posix_acl_release(res.acl_default); nfs_free_fattr(res.fattr); if (status != 0) { posix_acl_release(acl); acl = ERR_PTR(status); } return acl; } static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, struct posix_acl *dfacl) { struct nfs_server *server = NFS_SERVER(inode); struct nfs_fattr *fattr; struct page *pages[NFSACL_MAXPAGES]; struct nfs3_setaclargs args = { .inode = inode, .mask = NFS_ACL, .acl_access = acl, .pages = pages, }; struct rpc_message msg = { .rpc_argp = &args, .rpc_resp = &fattr, }; int status; status = -EOPNOTSUPP; if (!nfs_server_capable(inode, NFS_CAP_ACLS)) goto out; /* We are doing this here, because XDR marshalling can only return -ENOMEM. */ status = -ENOSPC; if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) goto out; if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) goto out; if (S_ISDIR(inode->i_mode)) { args.mask |= NFS_DFACL; args.acl_default = dfacl; args.len = nfsacl_size(acl, dfacl); } else args.len = nfsacl_size(acl, NULL); if (args.len > NFS_ACL_INLINE_BUFSIZE) { unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT); status = -ENOMEM; do { args.pages[args.npages] = alloc_page(GFP_KERNEL); if (args.pages[args.npages] == NULL) goto out_freepages; args.npages++; } while (args.npages < npages); } dprintk("NFS call setacl\n"); status = -ENOMEM; fattr = nfs_alloc_fattr(); if (fattr == NULL) goto out_freepages; msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; msg.rpc_resp = fattr; status = rpc_call_sync(server->client_acl, &msg, 0); nfs_access_zap_cache(inode); nfs_zap_acl_cache(inode); dprintk("NFS reply setacl: %d\n", status); switch (status) { case 0: status = nfs_refresh_inode(inode, fattr); nfs3_cache_acls(inode, acl, dfacl); break; case -EPFNOSUPPORT: case -EPROTONOSUPPORT: dprintk("NFS_V3_ACL SETACL RPC not supported" "(will not retry)\n"); server->caps &= ~NFS_CAP_ACLS; case -ENOTSUPP: status = -EOPNOTSUPP; } nfs_free_fattr(fattr); out_freepages: while (args.npages != 0) { args.npages--; __free_page(args.pages[args.npages]); } out: return status; } int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl) { struct posix_acl *alloc = NULL, *dfacl = NULL; int status; if (S_ISDIR(inode->i_mode)) { switch(type) { case ACL_TYPE_ACCESS: alloc = dfacl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(alloc)) goto fail; break; case ACL_TYPE_DEFAULT: dfacl = acl; alloc = acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS); if (IS_ERR(alloc)) goto fail; break; default: return -EINVAL; } } else if (type != ACL_TYPE_ACCESS) return -EINVAL; if (acl == NULL) { alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); if (IS_ERR(alloc)) goto fail; } status = nfs3_proc_setacls(inode, acl, dfacl); posix_acl_release(alloc); return status; fail: return PTR_ERR(alloc); } int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, mode_t mode) { struct posix_acl *dfacl, *acl; int error = 0; dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT); if (IS_ERR(dfacl)) { error = PTR_ERR(dfacl); return (error == -EOPNOTSUPP) ? 0 : error; } if (!dfacl) return 0; acl = posix_acl_clone(dfacl, GFP_KERNEL); error = -ENOMEM; if (!acl) goto out_release_dfacl; error = posix_acl_create_masq(acl, &mode); if (error < 0) goto out_release_acl; error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ? dfacl : NULL); out_release_acl: posix_acl_release(acl); out_release_dfacl: posix_acl_release(dfacl); return error; }