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Linux: use filemap_range_has_page()

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As of the 4.13 kernel filemap_range_has_page() can be used to
check if there is a page mapped in a given file range.  When
available this interface should be used which eliminates the
need for the zp->z_is_mapped boolean.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #14493
This commit is contained in:
Brian Behlendorf 2023-02-14 11:04:34 -08:00 committed by GitHub
parent ab672133a9
commit 3fc92adc40
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 65 additions and 17 deletions
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26
config/kernel-filemap.m4 Normal file
View File

@ -0,0 +1,26 @@
dnl #
dnl # filemap_range_has_page was not available till 4.13
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_FILEMAP], [
ZFS_LINUX_TEST_SRC([filemap_range_has_page], [
#include <linux/fs.h>
],[
struct address_space *mapping = NULL;
loff_t lstart = 0;
loff_t lend = 0;
bool ret __attribute__ ((unused));
ret = filemap_range_has_page(mapping, lstart, lend);
])
])
AC_DEFUN([ZFS_AC_KERNEL_FILEMAP], [
AC_MSG_CHECKING([whether filemap_range_has_page() is available])
ZFS_LINUX_TEST_RESULT([filemap_range_has_page], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FILEMAP_RANGE_HAS_PAGE, 1,
[filemap_range_has_page() is available])
],[
AC_MSG_RESULT(no)
])
])

2
config/kernel.m4
View File

@ -150,6 +150,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
ZFS_AC_KERNEL_SRC_IATTR_VFSID
ZFS_AC_KERNEL_SRC_FILEMAP
AC_MSG_CHECKING([for available kernel interfaces])
ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@ -273,6 +274,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_IDMAP_MNT_API
ZFS_AC_KERNEL_IATTR_VFSID
ZFS_AC_KERNEL_FILEMAP
])
dnl #

3
include/os/freebsd/zfs/sys/zfs_znode_impl.h
View File

@ -116,7 +116,8 @@ typedef struct zfs_soft_state {
#define Z_ISLNK(type) ((type) == VLNK)
#define Z_ISDIR(type) ((type) == VDIR)
#define zn_has_cached_data(zp) vn_has_cached_data(ZTOV(zp))
#define zn_has_cached_data(zp, start, end) \
vn_has_cached_data(ZTOV(zp))
#define zn_flush_cached_data(zp, sync) vn_flush_cached_data(ZTOV(zp), sync)
#define zn_rlimit_fsize(zp, uio) \
vn_rlimit_fsize(ZTOV(zp), GET_UIO_STRUCT(uio), zfs_uio_td(uio))

9
include/os/linux/zfs/sys/trace_acl.h
View File

@ -62,7 +62,6 @@ DECLARE_EVENT_CLASS(zfs_ace_class,
__field(uint32_t, z_async_writes_cnt)
__field(mode_t, z_mode)
__field(boolean_t, z_is_sa)
__field(boolean_t, z_is_mapped)
__field(boolean_t, z_is_ctldir)
__field(uint32_t, i_uid)
@ -96,7 +95,6 @@ DECLARE_EVENT_CLASS(zfs_ace_class,
__entry->z_async_writes_cnt = zn->z_async_writes_cnt;
__entry->z_mode = zn->z_mode;
__entry->z_is_sa = zn->z_is_sa;
__entry->z_is_mapped = zn->z_is_mapped;
__entry->z_is_ctldir = zn->z_is_ctldir;
__entry->i_uid = KUID_TO_SUID(ZTOI(zn)->i_uid);
@ -119,7 +117,7 @@ DECLARE_EVENT_CLASS(zfs_ace_class,
"zn_prefetch %u blksz %u seq %u "
"mapcnt %llu size %llu pflags %llu "
"sync_cnt %u sync_writes_cnt %u async_writes_cnt %u "
"mode 0x%x is_sa %d is_mapped %d is_ctldir %d "
"mode 0x%x is_sa %d is_ctldir %d "
"inode { uid %u gid %u ino %lu nlink %u size %lli "
"blkbits %u bytes %u mode 0x%x generation %x } } "
"ace { type %u flags %u access_mask %u } mask_matched %u",
@ -128,9 +126,8 @@ DECLARE_EVENT_CLASS(zfs_ace_class,
__entry->z_seq, __entry->z_mapcnt, __entry->z_size,
__entry->z_pflags, __entry->z_sync_cnt,
__entry->z_sync_writes_cnt, __entry->z_async_writes_cnt,
__entry->z_mode, __entry->z_is_sa, __entry->z_is_mapped,
__entry->z_is_ctldir, __entry->i_uid,
__entry->i_gid, __entry->i_ino, __entry->i_nlink,
__entry->z_mode, __entry->z_is_sa, __entry->z_is_ctldir,
__entry->i_uid, __entry->i_gid, __entry->i_ino, __entry->i_nlink,
__entry->i_size, __entry->i_blkbits,
__entry->i_bytes, __entry->i_mode, __entry->i_generation,
__entry->z_type, __entry->z_flags, __entry->z_access_mask,

16
include/os/linux/zfs/sys/zfs_znode_impl.h
View File

@ -47,9 +47,16 @@
extern "C" {
#endif
#if defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
#define ZNODE_OS_FIELDS \
inode_timespec_t z_btime; /* creation/birth time (cached) */ \
struct inode z_inode;
#else
#define ZNODE_OS_FIELDS \
inode_timespec_t z_btime; /* creation/birth time (cached) */ \
struct inode z_inode; \
boolean_t z_is_mapped; /* we are mmap'ed */
#endif
/*
* Convert between znode pointers and inode pointers
@ -70,7 +77,14 @@ extern "C" {
#define Z_ISDEV(type) (S_ISCHR(type) || S_ISBLK(type) || S_ISFIFO(type))
#define Z_ISDIR(type) S_ISDIR(type)
#define zn_has_cached_data(zp) ((zp)->z_is_mapped)
#if defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
#define zn_has_cached_data(zp, start, end) \
filemap_range_has_page(ZTOI(zp)->i_mapping, start, end)
#else
#define zn_has_cached_data(zp, start, end) \
((zp)->z_is_mapped)
#endif
#define zn_flush_cached_data(zp, sync) write_inode_now(ZTOI(zp), sync)
#define zn_rlimit_fsize(zp, uio) (0)

1
include/sys/zfs_znode.h
View File

@ -188,7 +188,6 @@ typedef struct znode {
boolean_t z_atime_dirty; /* atime needs to be synced */
boolean_t z_zn_prefetch; /* Prefetch znodes? */
boolean_t z_is_sa; /* are we native sa? */
boolean_t z_is_mapped; /* are we mmap'ed */
boolean_t z_is_ctldir; /* are we .zfs entry */
boolean_t z_suspended; /* extra ref from a suspend? */
uint_t z_blksz; /* block size in bytes */

2
module/os/linux/zfs/zfs_ctldir.c
View File

@ -498,7 +498,9 @@ zfsctl_inode_alloc(zfsvfs_t *zfsvfs, uint64_t id,
zp->z_atime_dirty = B_FALSE;
zp->z_zn_prefetch = B_FALSE;
zp->z_is_sa = B_FALSE;
#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
zp->z_is_mapped = B_FALSE;
#endif
zp->z_is_ctldir = B_TRUE;
zp->z_sa_hdl = NULL;
zp->z_blksz = 0;

5
module/os/linux/zfs/zfs_vnops_os.c
View File

@ -987,7 +987,7 @@ top:
mutex_enter(&zp->z_lock);
may_delete_now = atomic_read(&ZTOI(zp)->i_count) == 1 &&
!(zp->z_is_mapped);
!zn_has_cached_data(zp, 0, LLONG_MAX);
mutex_exit(&zp->z_lock);
/*
@ -1075,7 +1075,8 @@ top:
&xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
delete_now = may_delete_now && !toobig &&
atomic_read(&ZTOI(zp)->i_count) == 1 &&
!(zp->z_is_mapped) && xattr_obj == xattr_obj_unlinked &&
!zn_has_cached_data(zp, 0, LLONG_MAX) &&
xattr_obj == xattr_obj_unlinked &&
zfs_external_acl(zp) == acl_obj;
}

4
module/os/linux/zfs/zfs_znode.c
View File

@ -551,7 +551,9 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
ASSERT3P(zp->z_xattr_cached, ==, NULL);
zp->z_unlinked = B_FALSE;
zp->z_atime_dirty = B_FALSE;
#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
zp->z_is_mapped = B_FALSE;
#endif
zp->z_is_ctldir = B_FALSE;
zp->z_suspended = B_FALSE;
zp->z_sa_hdl = NULL;
@ -1641,7 +1643,7 @@ zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
* Zero partial page cache entries. This must be done under a
* range lock in order to keep the ARC and page cache in sync.
*/
if (zp->z_is_mapped) {
if (zn_has_cached_data(zp, off, off + len - 1)) {
loff_t first_page, last_page, page_len;
loff_t first_page_offset, last_page_offset;

6
module/os/linux/zfs/zpl_file.c
View File

@ -625,7 +625,6 @@ static int
zpl_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct inode *ip = filp->f_mapping->host;
znode_t *zp = ITOZ(ip);
int error;
fstrans_cookie_t cookie;
@ -640,9 +639,12 @@ zpl_mmap(struct file *filp, struct vm_area_struct *vma)
if (error)
return (error);
#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
znode_t *zp = ITOZ(ip);
mutex_enter(&zp->z_lock);
zp->z_is_mapped = B_TRUE;
mutex_exit(&zp->z_lock);
#endif
return (error);
}
@ -937,7 +939,7 @@ zpl_fadvise(struct file *filp, loff_t offset, loff_t len, int advice)
case POSIX_FADV_SEQUENTIAL:
case POSIX_FADV_WILLNEED:
#ifdef HAVE_GENERIC_FADVISE
if (zn_has_cached_data(zp))
if (zn_has_cached_data(zp, offset, offset + len - 1))
error = generic_fadvise(filp, offset, len, advice);
#endif
/*

8
module/zfs/zfs_vnops.c
View File

@ -106,7 +106,7 @@ zfs_holey_common(znode_t *zp, ulong_t cmd, loff_t *off)
hole = B_FALSE;
/* Flush any mmap()'d data to disk */
if (zn_has_cached_data(zp))
if (zn_has_cached_data(zp, 0, file_sz - 1))
zn_flush_cached_data(zp, B_FALSE);
lr = zfs_rangelock_enter(&zp->z_rangelock, 0, file_sz, RL_READER);
@ -288,7 +288,8 @@ zfs_read(struct znode *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
error = mappedread_sf(zp, nbytes, uio);
else
#endif
if (zn_has_cached_data(zp) && !(ioflag & O_DIRECT)) {
if (zn_has_cached_data(zp, zfs_uio_offset(uio),
zfs_uio_offset(uio) + nbytes - 1) && !(ioflag & O_DIRECT)) {
error = mappedread(zp, nbytes, uio);
} else {
error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
@ -696,7 +697,8 @@ zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
zfs_uioskip(uio, nbytes);
tx_bytes = nbytes;
}
if (tx_bytes && zn_has_cached_data(zp) &&
if (tx_bytes &&
zn_has_cached_data(zp, woff, woff + tx_bytes - 1) &&
!(ioflag & O_DIRECT)) {
update_pages(zp, woff, tx_bytes, zfsvfs->z_os);
}