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export/fuse: Pass default_permissions for mount

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We do not do any permission checks in fuse_open(), so let the kernel do
them.  We already let fuse_getattr() report the proper UNIX permissions,
so this should work the way we want.

This causes a change in 308's reference output, because now opening a
non-writable export with O_RDWR fails already, instead of only actually
attempting to write to it.  (That is an improvement.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210625142317.271673-2-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2021-06-25 16:23:12 +02:00 • committed by Kevin Wolf
parent c2615bdfbd
commit 2c7dd057aa
3 changed files with 9 additions and 4 deletions
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8
block/export/fuse.c
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@ -153,8 +153,12 @@ static int setup_fuse_export(FuseExport *exp, const char *mountpoint,
struct fuse_args fuse_args;
int ret;
/* Needs to match what fuse_init() sets. Only max_read must be supplied. */
mount_opts = g_strdup_printf("max_read=%zu", FUSE_MAX_BOUNCE_BYTES);
/*
* max_read needs to match what fuse_init() sets.
* max_write need not be supplied.
*/
mount_opts = g_strdup_printf("max_read=%zu,default_permissions",
FUSE_MAX_BOUNCE_BYTES);
fuse_argv[0] = ""; /* Dummy program name */
fuse_argv[1] = "-o";