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3dbcf27334
The logic to open a path currently sits between local_open_nofollow() and the relative_openat_nofollow() helper, which has no other user. For the sake of clarity, this patch moves all the code of the helper into its unique caller. While here we also: - drop the code to skip leading "/" because the backend isn't supposed to pass anything but relative paths without consecutive slashes. The assert() is kept because we really don't want a buggy backend to pass an absolute path to openat(). - use strchrnul() to get a simpler code. This is ok since virtfs is for linux+glibc hosts only. - don't dup() the initial directory and add an assert() to ensure we don't return the global mountfd to the caller. BTW, this would mean that the caller passed an empty path, which isn't supposed to happen either. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Eric Blake <eblake@redhat.com> [groug: fixed typos in changelog]
27 lines
626 B
C
27 lines
626 B
C
/*
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* 9p utilities
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*
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* Copyright IBM, Corp. 2017
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*
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* Authors:
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* Greg Kurz <groug@kaod.org>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/xattr.h"
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#include "9p-util.h"
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ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
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void *value, size_t size)
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{
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char *proc_path = g_strdup_printf("/proc/self/fd/%d/%s", dirfd, filename);
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int ret;
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ret = lgetxattr(proc_path, name, value, size);
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g_free(proc_path);
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return ret;
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}
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