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@@ -21,11 +21,11 @@
/*
* Copyright 2007 Sun Microsystems, Inc.
* All rights reserved. Use is subject to license terms.
*/
/*
- * Copyright 2016 Joyent, Inc.
+ * Copyright 2015 Joyent, Inc.
*/
#ifndef _SYS_FS_TMP_H
#define _SYS_FS_TMP_H
@@ -41,14 +41,12 @@
*/
struct tmount {
struct vfs *tm_vfsp; /* filesystem's vfs struct */
struct tmpnode *tm_rootnode; /* root tmpnode */
char *tm_mntpath; /* name of tmpfs mount point */
- size_t tm_anonmax; /* file system max anon reservation */
- size_t tm_anonmem; /* bytes of reserved anon memory */
- /* and allocated kmem for the fs */
- size_t tm_allocmem; /* bytes alloced from tmp_kmem_ funcs */
+ ulong_t tm_anonmax; /* file system max anon reservation */
+ pgcnt_t tm_anonmem; /* pages of reserved anon memory */
dev_t tm_dev; /* unique dev # of mounted `device' */
uint_t tm_gen; /* pseudo generation number for files */
kmutex_t tm_contents; /* lock for tmount structure */
kmutex_t tm_renamelck; /* rename lock for this mount */
};
@@ -58,11 +56,10 @@
*/
#define VFSTOTM(vfsp) ((struct tmount *)(vfsp)->vfs_data)
#define VTOTM(vp) ((struct tmount *)(vp)->v_vfsp->vfs_data)
#define VTOTN(vp) ((struct tmpnode *)(vp)->v_data)
#define TNTOV(tp) ((tp)->tn_vnode)
-#define TNTOTM(tp) (VTOTM(TNTOV(tp)))
#define tmpnode_hold(tp) VN_HOLD(TNTOV(tp))
#define tmpnode_rele(tp) VN_RELE(TNTOV(tp))
/*
* enums
@@ -70,56 +67,55 @@
enum de_op { DE_CREATE, DE_MKDIR, DE_LINK, DE_RENAME }; /* direnter ops */
enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */
/*
* tmpfs_minfree is the amount (in pages) of anonymous memory that tmpfs
- * leaves free for the rest of the system. In antiquity, this number could be
- * relevant on a system-wide basis, as physical DRAM was routinely exhausted;
- * however, in more modern times, the relative growth of DRAM with respect to
- * application footprint means that this number is only likely to become
- * factor in a virtualized OS environment (e.g., a zone) -- and even then only
- * when DRAM and swap have both been capped low to allow for maximum tenancy.
- * TMPMINFREE -- the value from which tmpfs_minfree is derived -- should
- * therefore be configured to a value that is roughly the smallest practical
- * value for memory + swap minus the largest reasonable size for tmpfs in such
- * a configuration. As of this writing, the smallest practical memory + swap
- * configuration is 128MB, and it seems reasonable to allow tmpfs to consume
- * no more than seven-eighths of this, yielding a TMPMINFREE of 16MB. Care
- * should be exercised in changing this: tuning this value too high will
- * result in spurious ENOSPC errors in tmpfs in small zones (a problem that
- * can induce cascading failure surprisingly often); tuning this value too low
- * will result in tmpfs consumption alone to alone induce application-level
- * memory allocation failure.
+ * leaves free for the rest of the system. E.g. in a system with 32MB of
+ * configured swap space, if 16MB were reserved (leaving 16MB free),
+ * tmpfs could allocate up to 16MB - tmpfs_minfree. The default value
+ * for tmpfs_minfree is btopr(TMPMINFREE) but it can cautiously patched
+ * to a different number of pages.
+ * NB: If tmpfs allocates too much swap space, other processes will be
+ * unable to execute.
*/
-#define TMPMINFREE 16 * 1024 * 1024 /* 16 Megabytes */
+#define TMPMINFREE 2 * 1024 * 1024 /* 2 Megabytes */
extern size_t tmpfs_minfree; /* Anonymous memory in pages */
+/*
+ * tmpfs can allocate only a certain percentage of kernel memory,
+ * which is used for tmpnodes, directories, file names, etc.
+ * This is statically set as TMPMAXFRACKMEM of physical memory.
+ * The actual number of allocatable bytes can be patched in tmpfs_maxkmem.
+ */
+#define TMPMAXFRACKMEM 25 /* 1/25 of physical memory */
+
+extern size_t tmp_kmemspace;
+extern size_t tmpfs_maxkmem; /* Allocatable kernel memory in bytes */
+
extern void tmpnode_init(struct tmount *, struct tmpnode *,
struct vattr *, struct cred *);
-extern void tmpnode_cleanup(struct tmpnode *tp);
extern int tmpnode_trunc(struct tmount *, struct tmpnode *, ulong_t);
extern void tmpnode_growmap(struct tmpnode *, ulong_t);
extern int tdirlookup(struct tmpnode *, char *, struct tmpnode **,
struct cred *);
extern int tdirdelete(struct tmpnode *, struct tmpnode *, char *,
enum dr_op, struct cred *);
-extern int tdirinit(struct tmpnode *, struct tmpnode *);
+extern void tdirinit(struct tmpnode *, struct tmpnode *);
extern void tdirtrunc(struct tmpnode *);
+extern void *tmp_memalloc(size_t, int);
+extern void tmp_memfree(void *, size_t);
extern int tmp_resv(struct tmount *, struct tmpnode *, size_t, int);
extern int tmp_taccess(void *, int, struct cred *);
extern int tmp_sticky_remove_access(struct tmpnode *, struct tmpnode *,
struct cred *);
-extern int tmp_convnum(char *, size_t *);
+extern int tmp_convnum(char *, pgcnt_t *);
extern int tmp_convmode(char *, mode_t *);
extern int tdirenter(struct tmount *, struct tmpnode *, char *,
enum de_op, struct tmpnode *, struct tmpnode *, struct vattr *,
struct tmpnode **, struct cred *, caller_context_t *);
-extern void *tmp_kmem_zalloc(struct tmount *, size_t, int);
-extern void tmp_kmem_free(struct tmount *, void *, size_t);
-
#define TMP_MUSTHAVE 0x01
#ifdef __cplusplus
}
#endif