Differential D27488 Diff 80553 sys/fs/tmpfs/tmpfs_vnops.c

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sys/fs/tmpfs/tmpfs_vnops.c

Show First 20 Lines • Show All 1,437 Lines • ▼ Show 20 Lines	tmpfs_readlink(struct vop_readlink_args *v)
int error;		int error;
struct tmpfs_node *node;		struct tmpfs_node *node;

MPASS(uio->uio_offset == 0);		MPASS(uio->uio_offset == 0);
MPASS(vp->v_type == VLNK);		MPASS(vp->v_type == VLNK);

node = VP_TO_TMPFS_NODE(vp);		node = VP_TO_TMPFS_NODE(vp);

error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),		error = uiomove(node->tn_link_target, MIN(node->tn_size, uio->uio_resid),
uio);		uio);
tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);		tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);

return (error);		return (error);
}		}

		/*
		* VOP_FPLOOKUP_SYMLINK routines are subject to special circumstances, see
		* the comment above cache_fplookup for details.
		*
		* Check tmpfs_alloc_node for tmpfs-specific synchronisation notes.
		*/
static int		static int
		tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v)
		{
		struct vnode *vp;
		struct tmpfs_node *node;
		char *symlink;

		vp = v->a_vp;
		kibUnsubmitted Not Done Inline Actions ... but then this load should be acquire and testing of tn_link_smr done only after load provided non-NULL value. kib: ... but then this load should be acquire and testing of tn_link_smr done only after load…
		mjgAuthorUnsubmitted Done Inline Actions tn_link_smr only goes one way (false -> true), so possible pairs are: smr buffer + flag false ; fine transient failure smr buffer + flag true; normal stable state past creation non-smr buffer + flag false; normal stable state past creation non-smr buffer + flag true can't happen. Thus I don't think fences are needed here, but extra commentary probably would not hurt. I'm going to convert tn_link_smr accesses to use atomic_* though. mjg: tn_link_smr only goes one way (false -> true), so possible pairs are: smr buffer + flag false…
		node = VP_TO_TMPFS_NODE_SMR(vp);
		if (__predict_false(node == NULL))
		return (EAGAIN);
		if (!atomic_load_char(&node->tn_link_smr))
		return (EAGAIN);
		symlink = atomic_load_ptr(&node->tn_link_target);
		if (symlink == NULL)
		return (EAGAIN);

		return (cache_symlink_resolve(v->a_fpl, symlink, node->tn_size));
		}

		static int
tmpfs_inactive(struct vop_inactive_args *v)		tmpfs_inactive(struct vop_inactive_args *v)
{		{
struct vnode *vp;		struct vnode *vp;
struct tmpfs_node *node;		struct tmpfs_node *node;

vp = v->a_vp;		vp = v->a_vp;
node = VP_TO_TMPFS_NODE(vp);		node = VP_TO_TMPFS_NODE(vp);
if (node->tn_links == 0)		if (node->tn_links == 0)
▲ Show 20 Lines • Show All 314 Lines • ▼ Show 20 Lines	struct vop_vector tmpfs_vnodeop_entries = {
.vop_default = &default_vnodeops,		.vop_default = &default_vnodeops,
.vop_lookup = vfs_cache_lookup,		.vop_lookup = vfs_cache_lookup,
.vop_cachedlookup = tmpfs_cached_lookup,		.vop_cachedlookup = tmpfs_cached_lookup,
.vop_create = tmpfs_create,		.vop_create = tmpfs_create,
.vop_mknod = tmpfs_mknod,		.vop_mknod = tmpfs_mknod,
.vop_open = tmpfs_open,		.vop_open = tmpfs_open,
.vop_close = tmpfs_close,		.vop_close = tmpfs_close,
.vop_fplookup_vexec = tmpfs_fplookup_vexec,		.vop_fplookup_vexec = tmpfs_fplookup_vexec,
		.vop_fplookup_symlink = tmpfs_fplookup_symlink,
.vop_access = tmpfs_access,		.vop_access = tmpfs_access,
.vop_stat = tmpfs_stat,		.vop_stat = tmpfs_stat,
.vop_getattr = tmpfs_getattr,		.vop_getattr = tmpfs_getattr,
.vop_setattr = tmpfs_setattr,		.vop_setattr = tmpfs_setattr,
.vop_read = tmpfs_read,		.vop_read = tmpfs_read,
.vop_read_pgcache = tmpfs_read_pgcache,		.vop_read_pgcache = tmpfs_read_pgcache,
.vop_write = tmpfs_write,		.vop_write = tmpfs_write,
.vop_fsync = tmpfs_fsync,		.vop_fsync = tmpfs_fsync,
Show All 31 Lines