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ANDROID: fuse-bpf: Ignore readaheads unless they go to the daemon

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readpages will be triggered on the fuse fs in passthrough mode though
system calls like fadvise. If the daemon isn't aware of the file, this
will likely cause a hang.

For the moment, simply ignore fadvise in this situation

Bug: 301201239
Test: fuse_test, atest ScopedStorageDeviceTest both pass
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I524a84aeeb1b1593e51264fcc37f7cfa66757168
This commit is contained in:
Paul Lawrence 2023-11-15 14:29:23 -08:00 • committed by Treehugger Robot
parent 354b1b716c
commit cfdfc17a46
2 changed files with 46 additions and 0 deletions
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10
fs/fuse/file.c
View file

@ -1026,6 +1026,16 @@ static void fuse_readahead(struct readahead_control *rac)
struct fuse_conn *fc = get_fuse_conn(inode);
unsigned int i, max_pages, nr_pages = 0;
#ifdef CONFIG_FUSE_BPF
/*
* Currently no meaningful readahead is possible with fuse-bpf within
* the kernel, so unless the daemon is aware of this file, ignore this
* call.
*/
if (!get_fuse_inode(inode)->nodeid)
return;
#endif
if (fuse_is_bad(inode))
return;

36
tools/testing/selftests/filesystems/fuse/fuse_test.c
View file

@ -2079,6 +2079,41 @@ out:
return result;
}
static int bpf_test_readahead(const char *mount_dir)
{
const char *file_name = "file";
int result = TEST_FAILURE;
int file_fd = -1;
int src_fd = -1;
int fuse_dev = -1;
TEST(file_fd = s_creat(s_path(s(ft_src), s(file_name)), 0777),
file_fd != -1);
TESTSYSCALL(fallocate(file_fd, 0, 0, 4096));
TESTSYSCALL(close(file_fd));
file_fd = -1;
TEST(src_fd = open(ft_src, O_DIRECTORY | O_RDONLY | O_CLOEXEC),
src_fd != -1);
TEST(fuse_dev = open("/dev/fuse", O_RDWR | O_CLOEXEC), fuse_dev != -1);
TESTEQUAL(mount_fuse(mount_dir, -1, src_fd, &fuse_dev), 0);
TEST(file_fd = s_open(s_path(s(mount_dir), s(file_name)), O_RDONLY),
file_fd != -1);
TESTSYSCALL(posix_fadvise(file_fd, 0, 4096, POSIX_FADV_WILLNEED));
usleep(1000);
TESTSYSCALL(close(file_fd));
file_fd = -1;
result = TEST_SUCCESS;
out:
umount(mount_dir);
close(fuse_dev);
close(src_fd);
close(file_fd);
return result;
}
static void parse_range(const char *ranges, bool *run_test, size_t tests)
{
size_t i;
@ -2208,6 +2243,7 @@ int main(int argc, char *argv[])
MAKE_TEST(flock_test),
MAKE_TEST(bpf_test_create_and_remove_bpf),
MAKE_TEST(bpf_test_mkdir_and_remove_bpf),
MAKE_TEST(bpf_test_readahead),
};
#undef MAKE_TEST