diff options
Diffstat (limited to 'usr/src/uts/common/sys/fs')
| -rw-r--r-- | usr/src/uts/common/sys/fs/fifonode.h | 16 | ||||
| -rw-r--r-- | usr/src/uts/common/sys/fs/hyprlofs.h | 91 | ||||
| -rw-r--r-- | usr/src/uts/common/sys/fs/hyprlofs_info.h | 174 | ||||
| -rw-r--r-- | usr/src/uts/common/sys/fs/sdev_impl.h | 61 | ||||
| -rw-r--r-- | usr/src/uts/common/sys/fs/sdev_plugin.h | 106 | ||||
| -rw-r--r-- | usr/src/uts/common/sys/fs/tmp.h | 54 |
6 files changed, 447 insertions, 55 deletions
diff --git a/usr/src/uts/common/sys/fs/fifonode.h b/usr/src/uts/common/sys/fs/fifonode.h index d8b158ce3c..1ea8563e1c 100644 --- a/usr/src/uts/common/sys/fs/fifonode.h +++ b/usr/src/uts/common/sys/fs/fifonode.h @@ -21,6 +21,7 @@ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. + * Copyright 2017 Joyent, Inc. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ @@ -83,6 +84,7 @@ struct fifonode { struct msgb *fn_tail; /* last message to read */ fifolock_t *fn_lock; /* pointer to per fifo lock */ uint_t fn_count; /* Number of bytes on fn_mp */ + uint_t fn_hiwat; /* pipe (fifofast) high water */ kcondvar_t fn_wait_cv; /* fifo conditional variable */ ushort_t fn_wcnt; /* number of writers */ ushort_t fn_rcnt; /* number of readers */ @@ -135,6 +137,8 @@ typedef struct fifodata { #define FIFOPOLLRBAND 0x20000 #define FIFOSTAYFAST 0x40000 /* don't turn into stream mode */ #define FIFOWAITMODE 0x80000 /* waiting for the possibility to change mode */ +/* Data on loan, block reads. Use in conjunction with FIFOSTAYFAST. */ +#define FIFORDBLOCK 0x100000 #define FIFOHIWAT (16 * 1024) #define FIFOLOWAT (0) @@ -147,16 +151,6 @@ typedef struct fifodata { #if defined(_KERNEL) -/* - * Fifohiwat defined as a variable is to allow tuning of the high - * water mark if needed. It is not meant to be released. - */ -#if FIFODEBUG -extern int Fifohiwat; -#else /* FIFODEBUG */ -#define Fifohiwat FIFOHIWAT -#endif /* FIFODEBUG */ - extern struct vnodeops *fifo_vnodeops; extern const struct fs_operation_def fifo_vnodeops_template[]; extern struct kmem_cache *fnode_cache; @@ -181,6 +175,8 @@ extern void fifo_fastoff(fifonode_t *); extern struct streamtab *fifo_getinfo(); extern void fifo_wakereader(fifonode_t *, fifolock_t *); extern void fifo_wakewriter(fifonode_t *, fifolock_t *); +extern boolean_t fifo_stayfast_enter(fifonode_t *); +extern void fifo_stayfast_exit(fifonode_t *); #endif /* _KERNEL */ diff --git a/usr/src/uts/common/sys/fs/hyprlofs.h b/usr/src/uts/common/sys/fs/hyprlofs.h new file mode 100644 index 0000000000..b8c4149df2 --- /dev/null +++ b/usr/src/uts/common/sys/fs/hyprlofs.h @@ -0,0 +1,91 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2012, Joyent, Inc. All rights reserved. + */ + +#ifndef _SYS_FS_HYPRLOFS_H +#define _SYS_FS_HYPRLOFS_H + +#include <sys/param.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * hyprlofs ioctl numbers. + */ +#define HYPRLOFS_IOC ('H' << 8) + +#define HYPRLOFS_ADD_ENTRIES (HYPRLOFS_IOC | 1) +#define HYPRLOFS_RM_ENTRIES (HYPRLOFS_IOC | 2) +#define HYPRLOFS_RM_ALL (HYPRLOFS_IOC | 3) +#define HYPRLOFS_GET_ENTRIES (HYPRLOFS_IOC | 4) + +typedef struct { + char *hle_path; + uint_t hle_plen; + char *hle_name; + uint_t hle_nlen; +} hyprlofs_entry_t; + +typedef struct { + hyprlofs_entry_t *hle_entries; + uint_t hle_len; +} hyprlofs_entries_t; + +typedef struct { + char hce_path[MAXPATHLEN]; + char hce_name[MAXPATHLEN]; +} hyprlofs_curr_entry_t; + +typedef struct { + hyprlofs_curr_entry_t *hce_entries; + uint_t hce_cnt; +} hyprlofs_curr_entries_t; + +#ifdef _KERNEL +typedef struct { + caddr32_t hle_path; + uint_t hle_plen; + caddr32_t hle_name; + uint_t hle_nlen; +} hyprlofs_entry32_t; + +typedef struct { + caddr32_t hle_entries; + uint_t hle_len; +} hyprlofs_entries32_t; + +typedef struct { + caddr32_t hce_entries; + uint_t hce_cnt; +} hyprlofs_curr_entries32_t; + +#endif /* _KERNEL */ + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_FS_HYPRLOFS_H */ diff --git a/usr/src/uts/common/sys/fs/hyprlofs_info.h b/usr/src/uts/common/sys/fs/hyprlofs_info.h new file mode 100644 index 0000000000..38389f77d9 --- /dev/null +++ b/usr/src/uts/common/sys/fs/hyprlofs_info.h @@ -0,0 +1,174 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2012, Joyent, Inc. All rights reserved. + */ + +#ifndef _SYS_FS_HYPRLOFS_INFO_H +#define _SYS_FS_HYPRLOFS_INFO_H + +#include <sys/t_lock.h> +#include <vm/seg.h> +#include <vm/seg_vn.h> +#include <sys/vfs_opreg.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * hlnode is the file system dependent node for hyprlofs. + * It is modeled on the tmpfs tmpnode. + * + * hln_rwlock protects access of the directory list at hln_dir + * as well as syncronizing read/writes to directory hlnodes. + * hln_tlock protects updates to hln_mode and hln_nlink. + * hln_tlock doesn't require any hlnode locks. + */ +typedef struct hlnode { + struct hlnode *hln_back; /* linked list of hlnodes */ + struct hlnode *hln_forw; /* linked list of hlnodes */ + union { + struct { + struct hldirent *un_dirlist; /* dirent list */ + uint_t un_dirents; /* number of dirents */ + } un_dirstruct; + vnode_t *un_realvp; /* real vnode */ + } un_hlnode; + vnode_t *hln_vnode; /* vnode for this hlnode */ + int hln_gen; /* pseudo gen num for hlfid */ + int hln_looped; /* flag indicating loopback */ + vattr_t hln_attr; /* attributes */ + krwlock_t hln_rwlock; /* rw - serialize mods and */ + /* directory updates */ + kmutex_t hln_tlock; /* time, flag, and nlink lock */ +} hlnode_t; + +/* + * hyprlofs per-mount data structure. + * All fields are protected by hlm_contents. + */ +typedef struct { + vfs_t *hlm_vfsp; /* filesystem's vfs struct */ + hlnode_t *hlm_rootnode; /* root hlnode */ + char *hlm_mntpath; /* name of hyprlofs mount point */ + dev_t hlm_dev; /* unique dev # of mounted `device' */ + uint_t hlm_gen; /* pseudo generation number for files */ + kmutex_t hlm_contents; /* lock for hlfsmount structure */ +} hlfsmount_t; + +/* + * hyprlofs directories are made up of a linked list of hldirent structures + * hanging off directory hlnodes. File names are not fixed length, + * but are null terminated. + */ +typedef struct hldirent { + hlnode_t *hld_hlnode; /* hlnode for this file */ + struct hldirent *hld_next; /* next directory entry */ + struct hldirent *hld_prev; /* prev directory entry */ + uint_t hld_offset; /* "offset" of dir entry */ + uint_t hld_hash; /* a hash of td_name */ + struct hldirent *hld_link; /* linked via the hash table */ + hlnode_t *hld_parent; /* parent, dir we are in */ + char *hld_name; /* must be null terminated */ + /* max length is MAXNAMELEN */ +} hldirent_t; + +/* + * hlfid overlays the fid structure (for VFS_VGET) + */ +typedef struct { + uint16_t hlfid_len; + ino32_t hlfid_ino; + int32_t hlfid_gen; +} hlfid_t; + +/* + * File system independent to hyprlofs conversion macros + */ +#define VFSTOHLM(vfsp) ((hlfsmount_t *)(vfsp)->vfs_data) +#define VTOHLM(vp) ((hlfsmount_t *)(vp)->v_vfsp->vfs_data) +#define VTOHLN(vp) ((hlnode_t *)(vp)->v_data) +#define HLNTOV(tp) ((tp)->hln_vnode) +#define REALVP(vp) ((vnode_t *)VTOHLN(vp)->hln_realvp) +#define hlnode_hold(tp) VN_HOLD(HLNTOV(tp)) +#define hlnode_rele(tp) VN_RELE(HLNTOV(tp)) + +#define hln_dir un_hlnode.un_dirstruct.un_dirlist +#define hln_dirents un_hlnode.un_dirstruct.un_dirents +#define hln_realvp un_hlnode.un_realvp + +/* + * Attributes + */ +#define hln_mask hln_attr.va_mask +#define hln_type hln_attr.va_type +#define hln_mode hln_attr.va_mode +#define hln_uid hln_attr.va_uid +#define hln_gid hln_attr.va_gid +#define hln_fsid hln_attr.va_fsid +#define hln_nodeid hln_attr.va_nodeid +#define hln_nlink hln_attr.va_nlink +#define hln_size hln_attr.va_size +#define hln_atime hln_attr.va_atime +#define hln_mtime hln_attr.va_mtime +#define hln_ctime hln_attr.va_ctime +#define hln_rdev hln_attr.va_rdev +#define hln_blksize hln_attr.va_blksize +#define hln_nblocks hln_attr.va_nblocks +#define hln_seq hln_attr.va_seq + +/* + * enums + */ +enum de_op { DE_CREATE, DE_MKDIR }; /* direnter ops */ +enum dr_op { DR_REMOVE, DR_RMDIR }; /* dirremove ops */ + +/* + * hyprlofs_minfree is the amount (in pages) of anonymous memory that hyprlofs + * leaves free for the rest of the system. The default value for + * hyprlofs_minfree is btopr(HYPRLOFSMINFREE) but it can be patched to a + * different number of pages. Since hyprlofs doesn't actually use much + * memory, its unlikely this ever needs to be patched. + */ +#define HYPRLOFSMINFREE 8 * 1024 * 1024 /* 8 Megabytes */ + +extern size_t hyprlofs_minfree; /* Anonymous memory in pages */ + +extern void hyprlofs_node_init(hlfsmount_t *, hlnode_t *, vattr_t *, + cred_t *); +extern int hyprlofs_dirlookup(hlnode_t *, char *, hlnode_t **, cred_t *); +extern int hyprlofs_dirdelete(hlnode_t *, hlnode_t *, char *, enum dr_op, + cred_t *); +extern void hyprlofs_dirinit(hlnode_t *, hlnode_t *); +extern void hyprlofs_dirtrunc(hlnode_t *); +extern int hyprlofs_taccess(void *, int, cred_t *); +extern int hyprlofs_direnter(hlfsmount_t *, hlnode_t *, char *, enum de_op, + vnode_t *, vattr_t *, hlnode_t **, cred_t *); + +extern struct vnodeops *hyprlofs_vnodeops; +extern const struct fs_operation_def hyprlofs_vnodeops_template[]; + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_FS_HYPRLOFS_INFO_H */ diff --git a/usr/src/uts/common/sys/fs/sdev_impl.h b/usr/src/uts/common/sys/fs/sdev_impl.h index 9f9ce5c8c1..d1c5f674f1 100644 --- a/usr/src/uts/common/sys/fs/sdev_impl.h +++ b/usr/src/uts/common/sys/fs/sdev_impl.h @@ -37,6 +37,7 @@ extern "C" { #include <sys/vfs_opreg.h> #include <sys/list.h> #include <sys/nvpair.h> +#include <sys/fs/sdev_plugin.h> #include <sys/sunddi.h> /* @@ -129,6 +130,21 @@ typedef struct sdev_local_data { struct sdev_dprof sdev_lprof; /* profile for multi-inst */ } sdev_local_data_t; +/* sdev_flags */ +typedef enum sdev_flags { + SDEV_BUILD = 0x0001, /* directory cache out-of-date */ + SDEV_GLOBAL = 0x0002, /* global /dev nodes */ + SDEV_PERSIST = 0x0004, /* backing store persisted node */ + SDEV_NO_NCACHE = 0x0008, /* do not include in neg. cache */ + SDEV_DYNAMIC = 0x0010, /* special-purpose vnode ops */ + /* (ex: pts) */ + SDEV_VTOR = 0x0020, /* validate sdev_nodes during search */ + SDEV_ATTR_INVALID = 0x0040, /* invalid node attributes, */ + /* need update */ + SDEV_SUBDIR = 0x0080, /* match all subdirs under here */ + SDEV_ZONED = 0x0100 /* zoned subdir */ +} sdev_flags_t; + /* * /dev filesystem sdev_node defines */ @@ -151,7 +167,7 @@ typedef struct sdev_node { ino64_t sdev_ino; /* inode */ uint_t sdev_nlink; /* link count */ int sdev_state; /* state of this node */ - int sdev_flags; /* flags bit */ + sdev_flags_t sdev_flags; /* flags bit */ kmutex_t sdev_lookup_lock; /* node creation synch lock */ kcondvar_t sdev_lookup_cv; /* node creation sync cv */ @@ -162,7 +178,7 @@ typedef struct sdev_node { struct sdev_global_data sdev_globaldata; struct sdev_local_data sdev_localdata; } sdev_instance_data; - + list_node_t sdev_plist; /* link on plugin list */ void *sdev_private; } sdev_node_t; @@ -193,29 +209,11 @@ typedef enum { SDEV_READY } sdev_node_state_t; -/* sdev_flags */ -#define SDEV_BUILD 0x0001 /* directory cache out-of-date */ -#define SDEV_GLOBAL 0x0002 /* global /dev nodes */ -#define SDEV_PERSIST 0x0004 /* backing store persisted node */ -#define SDEV_NO_NCACHE 0x0008 /* do not include in neg. cache */ -#define SDEV_DYNAMIC 0x0010 /* special-purpose vnode ops */ - /* (ex: pts) */ -#define SDEV_VTOR 0x0020 /* validate sdev_nodes during search */ -#define SDEV_ATTR_INVALID 0x0040 /* invalid node attributes, */ - /* need update */ -#define SDEV_SUBDIR 0x0080 /* match all subdirs under here */ -#define SDEV_ZONED 0x0100 /* zoned subdir */ - /* sdev_lookup_flags */ #define SDEV_LOOKUP 0x0001 /* node creation in progress */ #define SDEV_READDIR 0x0002 /* VDIR readdir in progress */ #define SDEV_LGWAITING 0x0004 /* waiting for devfsadm completion */ -#define SDEV_VTOR_INVALID -1 -#define SDEV_VTOR_SKIP 0 -#define SDEV_VTOR_VALID 1 -#define SDEV_VTOR_STALE 2 - /* convenient macros */ #define SDEV_IS_GLOBAL(dv) \ (dv->sdev_flags & SDEV_GLOBAL) @@ -368,8 +366,13 @@ extern void sdev_devfsadmd_thread(struct sdev_node *, struct sdev_node *, extern int devname_profile_update(char *, size_t); extern struct sdev_data *sdev_find_mntinfo(char *); void sdev_mntinfo_rele(struct sdev_data *); +typedef void (*sdev_mnt_walk_f)(struct sdev_node *, void *); +void sdev_mnt_walk(sdev_mnt_walk_f, void *); extern struct vnodeops *devpts_getvnodeops(void); extern struct vnodeops *devvt_getvnodeops(void); +extern void sdev_plugin_nodeready(struct sdev_node *); +extern int sdev_plugin_init(void); +extern int sdev_plugin_fini(void); /* * boot states - warning, the ordering here is significant @@ -515,6 +518,23 @@ extern void sdev_nc_path_exists(sdev_nc_list_t *, char *); extern void sdev_modctl_dump_files(void); /* + * plugin and legacy vtab stuff + */ +/* directory dependent vop table */ +typedef struct sdev_vop_table { + char *vt_name; /* subdirectory name */ + const fs_operation_def_t *vt_service; /* vnodeops table */ + struct vnodeops **vt_global_vops; /* global container for vop */ + int (*vt_vtor)(struct sdev_node *); /* validate sdev_node */ + int vt_flags; +} sdev_vop_table_t; + +extern struct sdev_vop_table vtab[]; +extern struct vnodeops *sdev_get_vop(struct sdev_node *); +extern void sdev_set_no_negcache(struct sdev_node *); +extern void *sdev_get_vtor(struct sdev_node *dv); + +/* * globals */ extern kmutex_t sdev_lock; @@ -527,6 +547,7 @@ extern struct vnodeops *devipnet_vnodeops; extern struct vnodeops *devvt_vnodeops; extern struct sdev_data *sdev_origins; /* mount info for global /dev instance */ extern struct vnodeops *devzvol_vnodeops; +extern int sdev_vnodeops_tbl_size; extern const fs_operation_def_t sdev_vnodeops_tbl[]; extern const fs_operation_def_t devpts_vnodeops_tbl[]; diff --git a/usr/src/uts/common/sys/fs/sdev_plugin.h b/usr/src/uts/common/sys/fs/sdev_plugin.h new file mode 100644 index 0000000000..f4ed813c1e --- /dev/null +++ b/usr/src/uts/common/sys/fs/sdev_plugin.h @@ -0,0 +1,106 @@ +/* + * This file and its contents are supplied under the terms of the + * Common Development and Distribution License ("CDDL"), version 1.0. + * You may only use this file in accordance with the terms of version + * 1.0 of the CDDL. + * + * A full copy of the text of the CDDL should have accompanied this + * source. A copy of the CDDL is also available via the Internet at + * http://www.illumos.org/license/CDDL. + */ + +/* + * Copyright (c) 2018, Joyent, Inc. + */ + +#ifndef _SYS_SDEV_PLUGIN_H +#define _SYS_SDEV_PLUGIN_H + +/* + * Kernel sdev plugin interface + */ + +#ifdef _KERNEL + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/vnode.h> + +#endif /* _KERNEL */ + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef _KERNEL + +typedef uintptr_t sdev_plugin_hdl_t; +typedef uintptr_t sdev_ctx_t; + +/* + * Valid return values for sdev_plugin_validate_t. + */ +typedef enum sdev_plugin_validate { + SDEV_VTOR_INVALID = -1, + SDEV_VTOR_SKIP = 0, + SDEV_VTOR_VALID = 1, + SDEV_VTOR_STALE = 2 +} sdev_plugin_validate_t; + +/* + * Valid flags + */ +typedef enum sdev_plugin_flags { + SDEV_PLUGIN_NO_NCACHE = 0x1, + SDEV_PLUGIN_SUBDIR = 0x2 +} sdev_plugin_flags_t; + +#define SDEV_PLUGIN_FLAGS_MASK 0x3 + +/* + * Functions a module must implement + */ +typedef sdev_plugin_validate_t (*sp_valid_f)(sdev_ctx_t); +typedef int (*sp_filldir_f)(sdev_ctx_t); +typedef void (*sp_inactive_f)(sdev_ctx_t); + +#define SDEV_PLUGIN_VERSION 1 + +typedef struct sdev_plugin_ops { + int spo_version; + sdev_plugin_flags_t spo_flags; + sp_valid_f spo_validate; + sp_filldir_f spo_filldir; + sp_inactive_f spo_inactive; +} sdev_plugin_ops_t; + +extern sdev_plugin_hdl_t sdev_plugin_register(const char *, sdev_plugin_ops_t *, + int *); +extern int sdev_plugin_unregister(sdev_plugin_hdl_t); + +typedef enum sdev_ctx_flags { + SDEV_CTX_GLOBAL = 0x2 /* node belongs to the GZ */ +} sdev_ctx_flags_t; + +/* + * Context helper functions + */ +extern sdev_ctx_flags_t sdev_ctx_flags(sdev_ctx_t); +extern const char *sdev_ctx_name(sdev_ctx_t); +extern const char *sdev_ctx_path(sdev_ctx_t); +extern int sdev_ctx_minor(sdev_ctx_t, minor_t *); +extern enum vtype sdev_ctx_vtype(sdev_ctx_t); + +/* + * Callbacks to manipulate nodes + */ +extern int sdev_plugin_mkdir(sdev_ctx_t, char *); +extern int sdev_plugin_mknod(sdev_ctx_t, char *, mode_t, dev_t); + +#endif /* _KERNEL */ + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_SDEV_PLUGIN_H */ diff --git a/usr/src/uts/common/sys/fs/tmp.h b/usr/src/uts/common/sys/fs/tmp.h index fb07de6588..f4cee09244 100644 --- a/usr/src/uts/common/sys/fs/tmp.h +++ b/usr/src/uts/common/sys/fs/tmp.h @@ -23,7 +23,7 @@ * All rights reserved. Use is subject to license terms. */ /* - * Copyright 2015 Joyent, Inc. + * Copyright 2016 Joyent, Inc. */ #ifndef _SYS_FS_TMP_H @@ -43,8 +43,10 @@ struct tmount { struct vfs *tm_vfsp; /* filesystem's vfs struct */ struct tmpnode *tm_rootnode; /* root tmpnode */ char *tm_mntpath; /* name of tmpfs mount point */ - ulong_t tm_anonmax; /* file system max anon reservation */ - pgcnt_t tm_anonmem; /* pages of reserved anon memory */ + 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 */ 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 */ @@ -58,6 +60,7 @@ struct tmount { #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)) @@ -69,41 +72,39 @@ 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. 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. + * 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. */ -#define TMPMINFREE 2 * 1024 * 1024 /* 2 Megabytes */ +#define TMPMINFREE 16 * 1024 * 1024 /* 16 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 void tdirinit(struct tmpnode *, struct tmpnode *); +extern int 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 *, @@ -114,6 +115,9 @@ 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 |