mirror of https://gitee.com/openkylin/qemu.git
287 lines
7.0 KiB
C
287 lines
7.0 KiB
C
/*
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* 9p xattr callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "9p.h"
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#include "fsdev/file-op-9p.h"
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#include "9p-xattr.h"
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#include "9p-util.h"
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#include "9p-local.h"
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static XattrOperations *get_xattr_operations(XattrOperations **h,
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const char *name)
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{
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XattrOperations *xops;
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for (xops = *(h)++; xops != NULL; xops = *(h)++) {
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if (!strncmp(name, xops->name, strlen(xops->name))) {
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return xops;
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}
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}
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return NULL;
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}
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ssize_t v9fs_get_xattr(FsContext *ctx, const char *path,
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const char *name, void *value, size_t size)
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{
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XattrOperations *xops = get_xattr_operations(ctx->xops, name);
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if (xops) {
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return xops->getxattr(ctx, path, name, value, size);
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}
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errno = EOPNOTSUPP;
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return -1;
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}
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ssize_t pt_listxattr(FsContext *ctx, const char *path,
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char *name, void *value, size_t size)
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{
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int name_size = strlen(name) + 1;
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if (!value) {
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return name_size;
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}
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if (size < name_size) {
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errno = ERANGE;
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return -1;
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}
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/* no need for strncpy: name_size is strlen(name)+1 */
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memcpy(value, name, name_size);
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return name_size;
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}
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/*
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* Get the list and pass to each layer to find out whether
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* to send the data or not
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*/
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ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
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void *value, size_t vsize)
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{
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ssize_t size = 0;
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void *ovalue = value;
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XattrOperations *xops;
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char *orig_value, *orig_value_start;
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ssize_t xattr_len, parsed_len = 0, attr_len;
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char *dirpath, *name;
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int dirfd;
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/* Get the actual len */
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dirpath = g_path_get_dirname(path);
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dirfd = local_opendir_nofollow(ctx, dirpath);
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g_free(dirpath);
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if (dirfd == -1) {
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return -1;
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}
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name = g_path_get_basename(path);
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xattr_len = flistxattrat_nofollow(dirfd, name, value, 0);
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if (xattr_len <= 0) {
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g_free(name);
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close_preserve_errno(dirfd);
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return xattr_len;
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}
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/* Now fetch the xattr and find the actual size */
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orig_value = g_malloc(xattr_len);
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xattr_len = flistxattrat_nofollow(dirfd, name, orig_value, xattr_len);
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g_free(name);
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close_preserve_errno(dirfd);
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if (xattr_len < 0) {
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g_free(orig_value);
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return -1;
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}
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/* store the orig pointer */
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orig_value_start = orig_value;
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while (xattr_len > parsed_len) {
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xops = get_xattr_operations(ctx->xops, orig_value);
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if (!xops) {
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goto next_entry;
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}
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if (!value) {
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size += xops->listxattr(ctx, path, orig_value, value, vsize);
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} else {
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size = xops->listxattr(ctx, path, orig_value, value, vsize);
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if (size < 0) {
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goto err_out;
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}
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value += size;
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vsize -= size;
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}
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next_entry:
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/* Got the next entry */
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attr_len = strlen(orig_value) + 1;
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parsed_len += attr_len;
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orig_value += attr_len;
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}
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if (value) {
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size = value - ovalue;
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}
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err_out:
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g_free(orig_value_start);
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return size;
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}
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int v9fs_set_xattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size, int flags)
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{
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XattrOperations *xops = get_xattr_operations(ctx->xops, name);
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if (xops) {
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return xops->setxattr(ctx, path, name, value, size, flags);
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}
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errno = EOPNOTSUPP;
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return -1;
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}
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int v9fs_remove_xattr(FsContext *ctx,
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const char *path, const char *name)
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{
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XattrOperations *xops = get_xattr_operations(ctx->xops, name);
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if (xops) {
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return xops->removexattr(ctx, path, name);
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}
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errno = EOPNOTSUPP;
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return -1;
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}
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ssize_t local_getxattr_nofollow(FsContext *ctx, const char *path,
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const char *name, void *value, size_t size)
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{
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char *dirpath = g_path_get_dirname(path);
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char *filename = g_path_get_basename(path);
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int dirfd;
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ssize_t ret = -1;
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dirfd = local_opendir_nofollow(ctx, dirpath);
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if (dirfd == -1) {
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goto out;
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}
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ret = fgetxattrat_nofollow(dirfd, filename, name, value, size);
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close_preserve_errno(dirfd);
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out:
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g_free(dirpath);
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g_free(filename);
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return ret;
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}
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ssize_t pt_getxattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size)
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{
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return local_getxattr_nofollow(ctx, path, name, value, size);
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}
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ssize_t local_setxattr_nofollow(FsContext *ctx, const char *path,
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const char *name, void *value, size_t size,
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int flags)
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{
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char *dirpath = g_path_get_dirname(path);
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char *filename = g_path_get_basename(path);
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int dirfd;
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ssize_t ret = -1;
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dirfd = local_opendir_nofollow(ctx, dirpath);
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if (dirfd == -1) {
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goto out;
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}
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ret = fsetxattrat_nofollow(dirfd, filename, name, value, size, flags);
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close_preserve_errno(dirfd);
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out:
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g_free(dirpath);
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g_free(filename);
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return ret;
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}
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int pt_setxattr(FsContext *ctx, const char *path, const char *name, void *value,
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size_t size, int flags)
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{
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return local_setxattr_nofollow(ctx, path, name, value, size, flags);
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}
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ssize_t local_removexattr_nofollow(FsContext *ctx, const char *path,
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const char *name)
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{
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char *dirpath = g_path_get_dirname(path);
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char *filename = g_path_get_basename(path);
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int dirfd;
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ssize_t ret = -1;
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dirfd = local_opendir_nofollow(ctx, dirpath);
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if (dirfd == -1) {
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goto out;
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}
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ret = fremovexattrat_nofollow(dirfd, filename, name);
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close_preserve_errno(dirfd);
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out:
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g_free(dirpath);
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g_free(filename);
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return ret;
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}
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int pt_removexattr(FsContext *ctx, const char *path, const char *name)
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{
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return local_removexattr_nofollow(ctx, path, name);
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}
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ssize_t notsup_getxattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size)
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{
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errno = ENOTSUP;
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return -1;
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}
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int notsup_setxattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size, int flags)
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{
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errno = ENOTSUP;
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return -1;
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}
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ssize_t notsup_listxattr(FsContext *ctx, const char *path, char *name,
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void *value, size_t size)
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{
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return 0;
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}
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int notsup_removexattr(FsContext *ctx, const char *path, const char *name)
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{
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errno = ENOTSUP;
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return -1;
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}
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XattrOperations *mapped_xattr_ops[] = {
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&mapped_user_xattr,
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&mapped_pacl_xattr,
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&mapped_dacl_xattr,
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NULL,
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};
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XattrOperations *passthrough_xattr_ops[] = {
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&passthrough_user_xattr,
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&passthrough_acl_xattr,
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NULL,
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};
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/* for .user none model should be same as passthrough */
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XattrOperations *none_xattr_ops[] = {
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&passthrough_user_xattr,
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&none_acl_xattr,
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NULL,
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};
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