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Linux 4.11 compat: statx support

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Linux 4.11 added a new statx system call that allows us to expose crtime
as btime. We do this by caching crtime in the znode to match how atime,
ctime and mtime are cached in the inode.

statx also introduced a new way of reporting whether the immutable,
append and nodump bits have been set. It adds support for reporting
compression and encryption, but the semantics on other filesystems is
not just to report compression/encryption, but to allow it to be turned
on/off at the file level. We do not support that.

We could implement semantics where we refuse to allow user modification
of the bit, but we would need to do a dnode_hold() in zfs_znode_alloc()
to find out encryption/compression information. That would introduce
locking that will have a minor (although unmeasured) performance cost.
It also would be inferior to zdb, which reports far more detailed
information. We therefore omit reporting of encryption/compression
through statx in favor of recommending that users interested in such
information use zdb.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Closes #8507
This commit is contained in:
Richard Yao 2019-03-16 20:43:13 -04:00 committed by Brian Behlendorf
parent 0f402668f9
commit abbf0bd4eb
3 changed files with 41 additions and 9 deletions
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4
include/os/linux/zfs/sys/zfs_znode_impl.h
View File

@ -36,21 +36,21 @@
#include <sys/list.h>
#include <sys/dmu.h>
#include <sys/sa.h>
#include <sys/time.h>
#include <sys/zfs_vfsops.h>
#include <sys/rrwlock.h>
#include <sys/zfs_sa.h>
#include <sys/zfs_stat.h>
#include <sys/zfs_rlock.h>
#ifdef __cplusplus
extern "C" {
#endif
#define ZNODE_OS_FIELDS \
inode_timespec_t z_btime; /* creation/birth time (cached) */ \
struct inode z_inode;
/*
* Convert between znode pointers and inode pointers
*/

12
module/os/linux/zfs/zfs_znode.c
View File

@ -525,9 +525,9 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
uint64_t tmp_gen;
uint64_t links;
uint64_t z_uid, z_gid;
uint64_t atime[2], mtime[2], ctime[2];
uint64_t atime[2], mtime[2], ctime[2], btime[2];
uint64_t projid = ZFS_DEFAULT_PROJID;
sa_bulk_attr_t bulk[11];
sa_bulk_attr_t bulk[12];
int count = 0;
ASSERT(zfsvfs != NULL);
@ -569,6 +569,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || tmp_gen == 0 ||
(dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
@ -596,6 +597,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
ZFS_TIME_DECODE(&ip->i_atime, atime);
ZFS_TIME_DECODE(&ip->i_mtime, mtime);
ZFS_TIME_DECODE(&ip->i_ctime, ctime);
ZFS_TIME_DECODE(&zp->z_btime, btime);
ip->i_ino = zp->z_id;
zfs_znode_update_vfs(zp);
@ -1169,12 +1171,12 @@ zfs_rezget(znode_t *zp)
uint64_t obj_num = zp->z_id;
uint64_t mode;
uint64_t links;
sa_bulk_attr_t bulk[10];
sa_bulk_attr_t bulk[11];
int err;
int count = 0;
uint64_t gen;
uint64_t z_uid, z_gid;
uint64_t atime[2], mtime[2], ctime[2];
uint64_t atime[2], mtime[2], ctime[2], btime[2];
uint64_t projid = ZFS_DEFAULT_PROJID;
znode_hold_t *zh;
@ -1244,6 +1246,7 @@ zfs_rezget(znode_t *zp)
&mtime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
&ctime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
zfs_znode_dmu_fini(zp);
@ -1269,6 +1272,7 @@ zfs_rezget(znode_t *zp)
ZFS_TIME_DECODE(&ZTOI(zp)->i_atime, atime);
ZFS_TIME_DECODE(&ZTOI(zp)->i_mtime, mtime);
ZFS_TIME_DECODE(&ZTOI(zp)->i_ctime, ctime);
ZFS_TIME_DECODE(&zp->z_btime, btime);
if ((uint32_t)gen != ZTOI(zp)->i_generation) {
zfs_znode_dmu_fini(zp);

34
module/os/linux/zfs/zpl_inode.c
View File

@ -378,18 +378,46 @@ zpl_getattr_impl(const struct path *path, struct kstat *stat, u32 request_mask,
{
int error;
fstrans_cookie_t cookie;
struct inode *ip = path->dentry->d_inode;
znode_t *zp __maybe_unused = ITOZ(ip);
cookie = spl_fstrans_mark();
/*
* XXX request_mask and query_flags currently ignored.
* XXX query_flags currently ignored.
*/
#ifdef HAVE_USERNS_IOPS_GETATTR
error = -zfs_getattr_fast(user_ns, path->dentry->d_inode, stat);
error = -zfs_getattr_fast(user_ns, ip, stat);
#else
error = -zfs_getattr_fast(kcred->user_ns, path->dentry->d_inode, stat);
error = -zfs_getattr_fast(kcred->user_ns, ip, stat);
#endif
#ifdef STATX_BTIME
if (request_mask & STATX_BTIME) {
stat->btime = zp->z_btime;
stat->result_mask |= STATX_BTIME;
}
#endif
#ifdef STATX_ATTR_IMMUTABLE
if (zp->z_pflags & ZFS_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
#endif
#ifdef STATX_ATTR_APPEND
if (zp->z_pflags & ZFS_APPENDONLY)
stat->attributes |= STATX_ATTR_APPEND;
stat->attributes_mask |= STATX_ATTR_APPEND;
#endif
#ifdef STATX_ATTR_NODUMP
if (zp->z_pflags & ZFS_NODUMP)
stat->attributes |= STATX_ATTR_NODUMP;
stat->attributes_mask |= STATX_ATTR_NODUMP;
#endif
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);