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268 lines
6.3 KiB
268 lines
6.3 KiB
/* |
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* FUSE: Filesystem in Userspace |
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* Copyright (C) 2001-2016 Miklos Szeredi <[email protected]> |
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* |
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* This program can be distributed under the terms of the GNU GPL. |
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* See the file COPYING. |
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*/ |
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#include "fuse_i.h" |
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#include <linux/xattr.h> |
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#include <linux/posix_acl_xattr.h> |
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int fuse_setxattr(struct inode *inode, const char *name, const void *value, |
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size_t size, int flags, unsigned int extra_flags) |
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{ |
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struct fuse_mount *fm = get_fuse_mount(inode); |
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FUSE_ARGS(args); |
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struct fuse_setxattr_in inarg; |
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int err; |
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if (fm->fc->no_setxattr) |
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return -EOPNOTSUPP; |
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memset(&inarg, 0, sizeof(inarg)); |
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inarg.size = size; |
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inarg.flags = flags; |
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inarg.setxattr_flags = extra_flags; |
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args.opcode = FUSE_SETXATTR; |
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args.nodeid = get_node_id(inode); |
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args.in_numargs = 3; |
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args.in_args[0].size = fm->fc->setxattr_ext ? |
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sizeof(inarg) : FUSE_COMPAT_SETXATTR_IN_SIZE; |
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args.in_args[0].value = &inarg; |
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args.in_args[1].size = strlen(name) + 1; |
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args.in_args[1].value = name; |
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args.in_args[2].size = size; |
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args.in_args[2].value = value; |
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err = fuse_simple_request(fm, &args); |
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if (err == -ENOSYS) { |
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fm->fc->no_setxattr = 1; |
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err = -EOPNOTSUPP; |
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} |
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if (!err) { |
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fuse_invalidate_attr(inode); |
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fuse_update_ctime(inode); |
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} |
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return err; |
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} |
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ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value, |
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size_t size) |
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{ |
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struct fuse_mount *fm = get_fuse_mount(inode); |
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FUSE_ARGS(args); |
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struct fuse_getxattr_in inarg; |
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struct fuse_getxattr_out outarg; |
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ssize_t ret; |
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if (fm->fc->no_getxattr) |
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return -EOPNOTSUPP; |
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memset(&inarg, 0, sizeof(inarg)); |
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inarg.size = size; |
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args.opcode = FUSE_GETXATTR; |
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args.nodeid = get_node_id(inode); |
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args.in_numargs = 2; |
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args.in_args[0].size = sizeof(inarg); |
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args.in_args[0].value = &inarg; |
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args.in_args[1].size = strlen(name) + 1; |
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args.in_args[1].value = name; |
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/* This is really two different operations rolled into one */ |
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args.out_numargs = 1; |
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if (size) { |
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args.out_argvar = true; |
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args.out_args[0].size = size; |
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args.out_args[0].value = value; |
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} else { |
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args.out_args[0].size = sizeof(outarg); |
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args.out_args[0].value = &outarg; |
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} |
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ret = fuse_simple_request(fm, &args); |
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if (!ret && !size) |
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ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX); |
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if (ret == -ENOSYS) { |
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fm->fc->no_getxattr = 1; |
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ret = -EOPNOTSUPP; |
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} |
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return ret; |
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} |
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static int fuse_verify_xattr_list(char *list, size_t size) |
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{ |
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size_t origsize = size; |
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while (size) { |
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size_t thislen = strnlen(list, size); |
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if (!thislen || thislen == size) |
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return -EIO; |
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size -= thislen + 1; |
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list += thislen + 1; |
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} |
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return origsize; |
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} |
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ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) |
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{ |
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struct inode *inode = d_inode(entry); |
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struct fuse_mount *fm = get_fuse_mount(inode); |
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FUSE_ARGS(args); |
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struct fuse_getxattr_in inarg; |
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struct fuse_getxattr_out outarg; |
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ssize_t ret; |
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if (fuse_is_bad(inode)) |
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return -EIO; |
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if (!fuse_allow_current_process(fm->fc)) |
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return -EACCES; |
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if (fm->fc->no_listxattr) |
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return -EOPNOTSUPP; |
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memset(&inarg, 0, sizeof(inarg)); |
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inarg.size = size; |
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args.opcode = FUSE_LISTXATTR; |
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args.nodeid = get_node_id(inode); |
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args.in_numargs = 1; |
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args.in_args[0].size = sizeof(inarg); |
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args.in_args[0].value = &inarg; |
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/* This is really two different operations rolled into one */ |
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args.out_numargs = 1; |
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if (size) { |
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args.out_argvar = true; |
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args.out_args[0].size = size; |
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args.out_args[0].value = list; |
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} else { |
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args.out_args[0].size = sizeof(outarg); |
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args.out_args[0].value = &outarg; |
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} |
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ret = fuse_simple_request(fm, &args); |
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if (!ret && !size) |
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ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX); |
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if (ret > 0 && size) |
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ret = fuse_verify_xattr_list(list, ret); |
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if (ret == -ENOSYS) { |
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fm->fc->no_listxattr = 1; |
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ret = -EOPNOTSUPP; |
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} |
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return ret; |
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} |
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int fuse_removexattr(struct inode *inode, const char *name) |
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{ |
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struct fuse_mount *fm = get_fuse_mount(inode); |
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FUSE_ARGS(args); |
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int err; |
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if (fm->fc->no_removexattr) |
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return -EOPNOTSUPP; |
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args.opcode = FUSE_REMOVEXATTR; |
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args.nodeid = get_node_id(inode); |
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args.in_numargs = 1; |
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args.in_args[0].size = strlen(name) + 1; |
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args.in_args[0].value = name; |
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err = fuse_simple_request(fm, &args); |
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if (err == -ENOSYS) { |
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fm->fc->no_removexattr = 1; |
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err = -EOPNOTSUPP; |
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} |
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if (!err) { |
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fuse_invalidate_attr(inode); |
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fuse_update_ctime(inode); |
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} |
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return err; |
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} |
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static int fuse_xattr_get(const struct xattr_handler *handler, |
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struct dentry *dentry, struct inode *inode, |
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const char *name, void *value, size_t size) |
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{ |
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if (fuse_is_bad(inode)) |
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return -EIO; |
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return fuse_getxattr(inode, name, value, size); |
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} |
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static int fuse_xattr_set(const struct xattr_handler *handler, |
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struct user_namespace *mnt_userns, |
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struct dentry *dentry, struct inode *inode, |
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const char *name, const void *value, size_t size, |
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int flags) |
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{ |
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if (fuse_is_bad(inode)) |
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return -EIO; |
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if (!value) |
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return fuse_removexattr(inode, name); |
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return fuse_setxattr(inode, name, value, size, flags, 0); |
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} |
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static bool no_xattr_list(struct dentry *dentry) |
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{ |
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return false; |
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} |
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static int no_xattr_get(const struct xattr_handler *handler, |
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struct dentry *dentry, struct inode *inode, |
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const char *name, void *value, size_t size) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static int no_xattr_set(const struct xattr_handler *handler, |
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struct user_namespace *mnt_userns, |
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struct dentry *dentry, struct inode *nodee, |
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const char *name, const void *value, |
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size_t size, int flags) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static const struct xattr_handler fuse_xattr_handler = { |
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.prefix = "", |
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.get = fuse_xattr_get, |
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.set = fuse_xattr_set, |
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}; |
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const struct xattr_handler *fuse_xattr_handlers[] = { |
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&fuse_xattr_handler, |
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NULL |
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}; |
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const struct xattr_handler *fuse_acl_xattr_handlers[] = { |
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&posix_acl_access_xattr_handler, |
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&posix_acl_default_xattr_handler, |
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&fuse_xattr_handler, |
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NULL |
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}; |
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static const struct xattr_handler fuse_no_acl_access_xattr_handler = { |
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.name = XATTR_NAME_POSIX_ACL_ACCESS, |
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.flags = ACL_TYPE_ACCESS, |
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.list = no_xattr_list, |
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.get = no_xattr_get, |
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.set = no_xattr_set, |
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}; |
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static const struct xattr_handler fuse_no_acl_default_xattr_handler = { |
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.name = XATTR_NAME_POSIX_ACL_DEFAULT, |
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.flags = ACL_TYPE_ACCESS, |
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.list = no_xattr_list, |
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.get = no_xattr_get, |
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.set = no_xattr_set, |
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}; |
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const struct xattr_handler *fuse_no_acl_xattr_handlers[] = { |
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&fuse_no_acl_access_xattr_handler, |
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&fuse_no_acl_default_xattr_handler, |
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&fuse_xattr_handler, |
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NULL |
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};
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