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fusefs: allow the server to specify st_blksize

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If the server sets fuse_attr.blksize to a nonzero value in the response to
FUSE_GETATTR, then the client should use that as the value for
stat.st_blksize .

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Alan Somers 2019-05-16 22:50:04 +00:00
parent 16bd2d47c7
commit e7f73af118
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/fuse2/; revision=347897
2 changed files with 41 additions and 1 deletions
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7
sys/fs/fuse/fuse_internal.c
View File

@ -198,10 +198,12 @@ fuse_internal_cache_attrs(struct vnode *vp, struct fuse_attr *attr,
{
struct mount *mp;
struct fuse_vnode_data *fvdat;
struct fuse_data *data;
struct vattr *vp_cache_at;
mp = vnode_mount(vp);
fvdat = VTOFUD(vp);
data = fuse_get_mpdata(mp);
fuse_validity_2_bintime(attr_valid, attr_valid_nsec,
&fvdat->attr_cache_timeout);
@ -231,7 +233,10 @@ fuse_internal_cache_attrs(struct vnode *vp, struct fuse_attr *attr,
vap->va_mtime.tv_nsec = attr->mtimensec;
vap->va_ctime.tv_sec = attr->ctime;
vap->va_ctime.tv_nsec = attr->ctimensec;
vap->va_blocksize = PAGE_SIZE;
if (fuse_libabi_geq(data, 7, 9) && attr->blksize > 0)
vap->va_blocksize = attr->blksize;
else
vap->va_blocksize = PAGE_SIZE;
vap->va_type = IFTOVT(attr->mode);
vap->va_bytes = attr->blocks * S_BLKSIZE;
vap->va_flags = 0;

35
tests/sys/fs/fusefs/getattr.cc
View File

@ -28,6 +28,10 @@
* SUCH DAMAGE.
*/
extern "C" {
#include <sys/param.h>
}
#include "mockfs.hh"
#include "utils.hh"
@ -130,6 +134,35 @@ TEST_F(Getattr, attr_cache_timeout)
EXPECT_EQ(0, stat(FULLPATH, &sb));
}
/*
* If attr.blksize is zero, then the kernel should use a default value for
* st_blksize
*/
TEST_F(Getattr, blksize_zero)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
struct stat sb;
expect_lookup(RELPATH, ino, S_IFREG | 0644, 1, 1, 0, 0);
EXPECT_CALL(*m_mock, process(
ResultOf([](auto in) {
return (in->header.opcode == FUSE_GETATTR &&
in->header.nodeid == ino);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([](auto i __unused, auto out) {
SET_OUT_HEADER_LEN(out, attr);
out->body.attr.attr.mode = S_IFREG | 0644;
out->body.attr.attr.ino = ino; // Must match nodeid
out->body.attr.attr.blksize = 0;
})));
ASSERT_EQ(0, stat(FULLPATH, &sb)) << strerror(errno);
EXPECT_EQ((blksize_t)PAGE_SIZE, sb.st_blksize);
}
TEST_F(Getattr, enoent)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
@ -179,6 +212,7 @@ TEST_F(Getattr, ok)
out->body.attr.attr.uid = 10;
out->body.attr.attr.gid = 11;
out->body.attr.attr.rdev = 12;
out->body.attr.attr.blksize = 12345;
})));
ASSERT_EQ(0, stat(FULLPATH, &sb)) << strerror(errno);
@ -194,6 +228,7 @@ TEST_F(Getattr, ok)
EXPECT_EQ(10ul, sb.st_uid);
EXPECT_EQ(11ul, sb.st_gid);
EXPECT_EQ(12ul, sb.st_rdev);
EXPECT_EQ((blksize_t)12345, sb.st_blksize);
EXPECT_EQ(ino, sb.st_ino);
EXPECT_EQ(S_IFREG | 0644, sb.st_mode);