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tmpfs: add a knob to enable pgcache read for mount

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Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D41334
This commit is contained in:
Konstantin Belousov 2023-08-06 04:35:36 +03:00
parent 821dec4d56
commit 0f613ab85e
3 changed files with 8 additions and 2 deletions
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3
sys/fs/tmpfs/tmpfs.h
View File

@ -428,6 +428,9 @@ struct tmpfs_mount {
bool tm_nonc;
/* Do not update mtime on writes through mmaped areas. */
bool tm_nomtime;
/* Read from page cache directly. */
bool tm_pgread;
};
#define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock)
#define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock)

3
sys/fs/tmpfs/tmpfs_subr.c
View File

@ -1061,7 +1061,8 @@ tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
VI_LOCK(vp);
KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs"));
vp->v_object = object;
vn_irflag_set_locked(vp, VIRF_PGREAD | VIRF_TEXT_REF);
vn_irflag_set_locked(vp, (tm->tm_pgread ? VIRF_PGREAD : 0) |
VIRF_TEXT_REF);
VI_UNLOCK(vp);
VM_OBJECT_WUNLOCK(object);
break;

4
sys/fs/tmpfs/tmpfs_vfsops.c
View File

@ -329,7 +329,7 @@ tmpfs_mount(struct mount *mp)
struct tmpfs_mount *tmp;
struct tmpfs_node *root;
int error;
bool nomtime, nonc;
bool nomtime, nonc, pgread;
/* Size counters. */
u_quad_t pages;
off_t nodes_max, size_max, maxfilesize, ea_max_size;
@ -412,6 +412,7 @@ tmpfs_mount(struct mount *mp)
ea_max_size = 0;
nonc = vfs_getopt(mp->mnt_optnew, "nonc", NULL, NULL) == 0;
nomtime = vfs_getopt(mp->mnt_optnew, "nomtime", NULL, NULL) == 0;
pgread = vfs_getopt(mp->mnt_optnew, "pgread", NULL, NULL) == 0;
/* Do not allow mounts if we do not have enough memory to preserve
* the minimum reserved pages. */
@ -462,6 +463,7 @@ tmpfs_mount(struct mount *mp)
tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
tmp->tm_nonc = nonc;
tmp->tm_nomtime = nomtime;
tmp->tm_pgread = pgread;
/* Allocate the root node. */
error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid, root_gid,