/* * v9fs_xattr_set() * * Create, replace or remove an extended attribute for this inode. Buffer * is NULL to remove an existing extended attribute, and non-NULL to * either replace an existing extended attribute, or create a new extended * attribute. The flags XATTR_REPLACE and XATTR_CREATE * specify that an extended attribute must exist and must not exist * previous to the call, respectively. * * Returns 0, or a negative error number on failure. */ int v9fs_xattr_set(struct dentry *dentry, const char *name, const void *value, size_t value_len, int flags) { u64 offset = 0; int retval, msize, write_count; struct p9_fid *fid = NULL; P9_DPRINTK(P9_DEBUG_VFS, "%s: name = %s value_len = %zu flags = %d\n", __func__, name, value_len, flags); fid = v9fs_fid_clone(dentry); if (IS_ERR(fid)) { retval = PTR_ERR(fid); fid = NULL; goto error; } /* * On success fid points to xattr */ retval = p9_client_xattrcreate(fid, name, value_len, flags); if (retval < 0) { P9_DPRINTK(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n", retval); goto error; } msize = fid->clnt->msize;; while (value_len) { if (value_len > (msize - P9_IOHDRSZ)) write_count = msize - P9_IOHDRSZ; else write_count = value_len; write_count = p9_client_write(fid, ((char *)value)+offset, NULL, offset, write_count); if (write_count < 0) { /* error in xattr write */ retval = write_count; goto error; } offset += write_count; value_len -= write_count; } /* Total read xattr bytes */ retval = offset; error: if (fid) retval = p9_client_clunk(fid); return retval; }
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name, const void *value, size_t value_len, int flags) { struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len}; struct iov_iter from; int retval; iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len); p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n", name, value_len, flags); /* Clone it */ fid = p9_client_walk(fid, 0, NULL, 1); if (IS_ERR(fid)) return PTR_ERR(fid); /* * On success fid points to xattr */ retval = p9_client_xattrcreate(fid, name, value_len, flags); if (retval < 0) p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n", retval); else p9_client_write(fid, 0, &from, &retval); p9_client_clunk(fid); return retval; } ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) { return v9fs_xattr_get(dentry, NULL, buffer, buffer_size); } const struct xattr_handler *v9fs_xattr_handlers[] = { &v9fs_xattr_user_handler, &v9fs_xattr_trusted_handler, #ifdef CONFIG_9P_FS_POSIX_ACL &v9fs_xattr_acl_access_handler, &v9fs_xattr_acl_default_handler, #endif #ifdef CONFIG_9P_FS_SECURITY &v9fs_xattr_security_handler, #endif NULL };
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name, const void *value, size_t value_len, int flags) { u64 offset = 0; int retval, msize, write_count; p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n", name, value_len, flags); /* Clone it */ fid = p9_client_walk(fid, 0, NULL, 1); if (IS_ERR(fid)) return PTR_ERR(fid); /* * On success fid points to xattr */ retval = p9_client_xattrcreate(fid, name, value_len, flags); if (retval < 0) { p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n", retval); goto err; } msize = fid->clnt->msize; while (value_len) { if (value_len > (msize - P9_IOHDRSZ)) write_count = msize - P9_IOHDRSZ; else write_count = value_len; write_count = p9_client_write(fid, ((char *)value)+offset, NULL, offset, write_count); if (write_count < 0) { /* error in xattr write */ retval = write_count; goto err; } offset += write_count; value_len -= write_count; } retval = 0; err: p9_client_clunk(fid); return retval; }