The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/tmpfs/tmpfs.h

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    1 /*      $NetBSD: tmpfs.h,v 1.26 2007/02/22 06:37:00 thorpej Exp $       */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
    5  *
    6  * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to The NetBSD Foundation
   10  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
   11  * 2005 program.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32  * POSSIBILITY OF SUCH DAMAGE.
   33  *
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _FS_TMPFS_TMPFS_H_
   38 #define _FS_TMPFS_TMPFS_H_
   39 
   40 #include <sys/cdefs.h>
   41 #include <sys/queue.h>
   42 #include <sys/tree.h>
   43 
   44 #ifdef  _SYS_MALLOC_H_
   45 MALLOC_DECLARE(M_TMPFSNAME);
   46 #endif
   47 
   48 /*
   49  * Internal representation of a tmpfs directory entry.
   50  */
   51 
   52 LIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent);
   53 
   54 struct tmpfs_dirent {
   55         /*
   56          * Depending on td_cookie flag entry can be of 3 types:
   57          * - regular -- no hash collisions, stored in RB-Tree
   58          * - duphead -- synthetic linked list head for dup entries
   59          * - dup -- stored in linked list instead of RB-Tree
   60          */
   61         union {
   62                 /* regular and duphead entry types */
   63                 RB_ENTRY(tmpfs_dirent)          td_entries;
   64 
   65                 /* dup entry type */
   66                 struct {
   67                         LIST_ENTRY(tmpfs_dirent) entries;
   68                         LIST_ENTRY(tmpfs_dirent) index_entries;
   69                 } td_dup;
   70         } uh;
   71 
   72         uint32_t                        td_cookie;
   73         uint32_t                        td_hash;
   74         u_int                           td_namelen;
   75 
   76         /*
   77          * Pointer to the node this entry refers to.  In case this field
   78          * is NULL, the node is a whiteout.
   79          */
   80         struct tmpfs_node *             td_node;
   81 
   82         union {
   83                 /*
   84                  * The name of the entry, allocated from a string pool.  This
   85                  * string is not required to be zero-terminated.
   86                  */
   87                 char *                  td_name;        /* regular, dup */
   88                 struct tmpfs_dir_duphead td_duphead;    /* duphead */
   89         } ud;
   90 };
   91 
   92 /*
   93  * A directory in tmpfs holds a collection of directory entries, which
   94  * in turn point to other files (which can be directories themselves).
   95  *
   96  * In tmpfs, this collection is managed by a RB-Tree, whose head is
   97  * defined by the struct tmpfs_dir type.
   98  *
   99  * It is important to notice that directories do not have entries for . and
  100  * .. as other file systems do.  These can be generated when requested
  101  * based on information available by other means, such as the pointer to
  102  * the node itself in the former case or the pointer to the parent directory
  103  * in the latter case.  This is done to simplify tmpfs's code and, more
  104  * importantly, to remove redundancy.
  105  */
  106 RB_HEAD(tmpfs_dir, tmpfs_dirent);
  107 
  108 /*
  109  * Each entry in a directory has a cookie that identifies it.  Cookies
  110  * supersede offsets within directories because, given how tmpfs stores
  111  * directories in memory, there is no such thing as an offset.
  112  *
  113  * The '.', '..' and the end of directory markers have fixed cookies which
  114  * cannot collide with the cookies generated by other entries.  The cookies
  115  * for the other entries are generated based on the file name hash value or
  116  * unique number in case of name hash collision.
  117  *
  118  * To preserve compatibility cookies are limited to 31 bits.
  119  */
  120 
  121 #define TMPFS_DIRCOOKIE_DOT             0
  122 #define TMPFS_DIRCOOKIE_DOTDOT          1
  123 #define TMPFS_DIRCOOKIE_EOF             2
  124 #define TMPFS_DIRCOOKIE_MASK            ((off_t)0x3fffffffU)
  125 #define TMPFS_DIRCOOKIE_MIN             ((off_t)0x00000004U)
  126 #define TMPFS_DIRCOOKIE_DUP             ((off_t)0x40000000U)
  127 #define TMPFS_DIRCOOKIE_DUPHEAD         ((off_t)0x80000000U)
  128 #define TMPFS_DIRCOOKIE_DUP_MIN         TMPFS_DIRCOOKIE_DUP
  129 #define TMPFS_DIRCOOKIE_DUP_MAX         \
  130         (TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK)
  131 
  132 /*
  133  * Internal representation of a tmpfs file system node.
  134  *
  135  * This structure is splitted in two parts: one holds attributes common
  136  * to all file types and the other holds data that is only applicable to
  137  * a particular type.  The code must be careful to only access those
  138  * attributes that are actually allowed by the node's type.
  139  *
  140  * Below is the key of locks used to protected the fields in the following
  141  * structures.
  142  * (v)  vnode lock in exclusive mode
  143  * (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and
  144  *      tn_interlock
  145  * (i)  tn_interlock
  146  * (m)  tmpfs_mount tm_allnode_lock
  147  * (c)  stable after creation
  148  */
  149 struct tmpfs_node {
  150         /*
  151          * Doubly-linked list entry which links all existing nodes for
  152          * a single file system.  This is provided to ease the removal
  153          * of all nodes during the unmount operation, and to support
  154          * the implementation of VOP_VNTOCNP().  tn_attached is false
  155          * when the node is removed from list and unlocked.
  156          */
  157         LIST_ENTRY(tmpfs_node)  tn_entries;     /* (m) */
  158         bool                    tn_attached;    /* (m) */
  159 
  160         /*
  161          * The node's type.  Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO',
  162          * 'VLNK', 'VREG' and 'VSOCK' is allowed.  The usage of vnode
  163          * types instead of a custom enumeration is to make things simpler
  164          * and faster, as we do not need to convert between two types.
  165          */
  166         enum vtype              tn_type;        /* (c) */
  167 
  168         /* Node identifier. */
  169         ino_t                   tn_id;          /* (c) */
  170 
  171         /*
  172          * Node's internal status.  This is used by several file system
  173          * operations to do modifications to the node in a delayed
  174          * fashion.
  175          */
  176         int                     tn_status;      /* (vi) */
  177 #define TMPFS_NODE_ACCESSED     (1 << 1)
  178 #define TMPFS_NODE_MODIFIED     (1 << 2)
  179 #define TMPFS_NODE_CHANGED      (1 << 3)
  180 
  181         /*
  182          * The node size.  It does not necessarily match the real amount
  183          * of memory consumed by it.
  184          */
  185         off_t                   tn_size;        /* (v) */
  186 
  187         /* Generic node attributes. */
  188         uid_t                   tn_uid;         /* (v) */
  189         gid_t                   tn_gid;         /* (v) */
  190         mode_t                  tn_mode;        /* (v) */
  191         int                     tn_links;       /* (v) */
  192         u_long                  tn_flags;       /* (v) */
  193         struct timespec         tn_atime;       /* (vi) */
  194         struct timespec         tn_mtime;       /* (vi) */
  195         struct timespec         tn_ctime;       /* (vi) */
  196         struct timespec         tn_birthtime;   /* (v) */
  197         unsigned long           tn_gen;         /* (c) */
  198 
  199         /*
  200          * As there is a single vnode for each active file within the
  201          * system, care has to be taken to avoid allocating more than one
  202          * vnode per file.  In order to do this, a bidirectional association
  203          * is kept between vnodes and nodes.
  204          *
  205          * Whenever a vnode is allocated, its v_data field is updated to
  206          * point to the node it references.  At the same time, the node's
  207          * tn_vnode field is modified to point to the new vnode representing
  208          * it.  Further attempts to allocate a vnode for this same node will
  209          * result in returning a new reference to the value stored in
  210          * tn_vnode.
  211          *
  212          * May be NULL when the node is unused (that is, no vnode has been
  213          * allocated for it or it has been reclaimed).
  214          */
  215         struct vnode *          tn_vnode;       /* (i) */
  216 
  217         /*
  218          * Interlock to protect tn_vpstate, and tn_status under shared
  219          * vnode lock.
  220          */
  221         struct mtx      tn_interlock;
  222 
  223         /*
  224          * Identify if current node has vnode assiocate with
  225          * or allocating vnode.
  226          */
  227         int             tn_vpstate;             /* (i) */
  228 
  229         /* Transient refcounter on this node. */
  230         u_int           tn_refcount;            /* (m) + (i) */
  231 
  232         /* misc data field for different tn_type node */
  233         union {
  234                 /* Valid when tn_type == VBLK || tn_type == VCHR. */
  235                 dev_t                   tn_rdev;        /* (c) */
  236 
  237                 /* Valid when tn_type == VDIR. */
  238                 struct tn_dir {
  239                         /*
  240                          * Pointer to the parent directory.  The root
  241                          * directory has a pointer to itself in this field;
  242                          * this property identifies the root node.
  243                          */
  244                         struct tmpfs_node *     tn_parent;
  245 
  246                         /*
  247                          * Head of a tree that links the contents of
  248                          * the directory together.
  249                          */
  250                         struct tmpfs_dir        tn_dirhead;
  251 
  252                         /*
  253                          * Head of a list the contains fake directory entries
  254                          * heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD
  255                          * flag.
  256                          */
  257                         struct tmpfs_dir_duphead tn_dupindex;
  258 
  259                         /*
  260                          * Number and pointer of the first directory entry
  261                          * returned by the readdir operation if it were
  262                          * called again to continue reading data from the
  263                          * same directory as before.  This is used to speed
  264                          * up reads of long directories, assuming that no
  265                          * more than one read is in progress at a given time.
  266                          * Otherwise, these values are discarded.
  267                          */
  268                         off_t                   tn_readdir_lastn;
  269                         struct tmpfs_dirent *   tn_readdir_lastp;
  270                 } tn_dir;
  271 
  272                 /* Valid when tn_type == VLNK. */
  273                 /* The link's target, allocated from a string pool. */
  274                 char *                  tn_link;        /* (c) */
  275 
  276                 /* Valid when tn_type == VREG. */
  277                 struct tn_reg {
  278                         /*
  279                          * The contents of regular files stored in a
  280                          * tmpfs file system are represented by a
  281                          * single anonymous memory object (aobj, for
  282                          * short).  The aobj provides direct access to
  283                          * any position within the file.  It is a task
  284                          * of the memory management subsystem to issue
  285                          * the required page ins or page outs whenever
  286                          * a position within the file is accessed.
  287                          */
  288                         vm_object_t             tn_aobj;        /* (c) */
  289                 } tn_reg;
  290         } tn_spec;      /* (v) */
  291 };
  292 LIST_HEAD(tmpfs_node_list, tmpfs_node);
  293 
  294 #define tn_rdev tn_spec.tn_rdev
  295 #define tn_dir tn_spec.tn_dir
  296 #define tn_link tn_spec.tn_link
  297 #define tn_reg tn_spec.tn_reg
  298 #define tn_fifo tn_spec.tn_fifo
  299 
  300 #define TMPFS_LINK_MAX INT_MAX
  301 
  302 #define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock)
  303 #define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock)
  304 #define TMPFS_NODE_MTX(node) (&(node)->tn_interlock)
  305 #define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \
  306     MA_OWNED)
  307 
  308 #ifdef INVARIANTS
  309 #define TMPFS_ASSERT_LOCKED(node) do {                                  \
  310                 MPASS((node) != NULL);                                  \
  311                 MPASS((node)->tn_vnode != NULL);                        \
  312                 ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert");    \
  313         } while (0)
  314 #else
  315 #define TMPFS_ASSERT_LOCKED(node) (void)0
  316 #endif
  317 
  318 #define TMPFS_VNODE_ALLOCATING  1
  319 #define TMPFS_VNODE_WANT        2
  320 #define TMPFS_VNODE_DOOMED      4
  321 #define TMPFS_VNODE_WRECLAIM    8
  322 
  323 /*
  324  * Internal representation of a tmpfs mount point.
  325  */
  326 struct tmpfs_mount {
  327         /*
  328          * Original value of the "size" parameter, for reference purposes,
  329          * mostly.
  330          */
  331         off_t                   tm_size_max;
  332         /*
  333          * Maximum number of memory pages available for use by the file
  334          * system, set during mount time.  This variable must never be
  335          * used directly as it may be bigger than the current amount of
  336          * free memory; in the extreme case, it will hold the ULONG_MAX
  337          * value.
  338          */
  339         u_long                  tm_pages_max;
  340 
  341         /* Number of pages in use by the file system. */
  342         u_long                  tm_pages_used;
  343 
  344         /*
  345          * Pointer to the node representing the root directory of this
  346          * file system.
  347          */
  348         struct tmpfs_node *     tm_root;
  349 
  350         /*
  351          * Maximum number of possible nodes for this file system; set
  352          * during mount time.  We need a hard limit on the maximum number
  353          * of nodes to avoid allocating too much of them; their objects
  354          * cannot be released until the file system is unmounted.
  355          * Otherwise, we could easily run out of memory by creating lots
  356          * of empty files and then simply removing them.
  357          */
  358         ino_t                   tm_nodes_max;
  359 
  360         /* unrhdr used to allocate inode numbers */
  361         struct unrhdr64         tm_ino_unr;
  362 
  363         /* Number of nodes currently that are in use. */
  364         ino_t                   tm_nodes_inuse;
  365 
  366         /* Refcounter on this struct tmpfs_mount. */
  367         uint64_t                tm_refcount;
  368 
  369         /* maximum representable file size */
  370         u_int64_t               tm_maxfilesize;
  371 
  372         /*
  373          * The used list contains all nodes that are currently used by
  374          * the file system; i.e., they refer to existing files.
  375          */
  376         struct tmpfs_node_list  tm_nodes_used;
  377 
  378         /* All node lock to protect the node list and tmp_pages_used. */
  379         struct mtx              tm_allnode_lock;
  380 
  381         /* Read-only status. */
  382         bool                    tm_ronly;
  383         /* Do not use namecache. */
  384         bool                    tm_nonc;
  385 };
  386 #define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock)
  387 #define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock)
  388 #define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED)
  389 
  390 /*
  391  * This structure maps a file identifier to a tmpfs node.  Used by the
  392  * NFS code.
  393  */
  394 struct tmpfs_fid_data {
  395         ino_t                   tfd_id;
  396         unsigned long           tfd_gen;
  397 };
  398 _Static_assert(sizeof(struct tmpfs_fid_data) <= MAXFIDSZ,
  399     "(struct tmpfs_fid_data) is larger than (struct fid).fid_data");
  400 
  401 struct tmpfs_dir_cursor {
  402         struct tmpfs_dirent     *tdc_current;
  403         struct tmpfs_dirent     *tdc_tree;
  404 };
  405 
  406 #ifdef _KERNEL
  407 /*
  408  * Prototypes for tmpfs_subr.c.
  409  */
  410 
  411 void    tmpfs_ref_node(struct tmpfs_node *node);
  412 void    tmpfs_ref_node_locked(struct tmpfs_node *node);
  413 int     tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, enum vtype,
  414             uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *,
  415             char *, dev_t, struct tmpfs_node **);
  416 void    tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *);
  417 bool    tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool);
  418 void    tmpfs_free_tmp(struct tmpfs_mount *);
  419 int     tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *,
  420             const char *, u_int, struct tmpfs_dirent **);
  421 void    tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *);
  422 void    tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int);
  423 void    tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj);
  424 int     tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int,
  425             struct vnode **);
  426 void    tmpfs_free_vp(struct vnode *);
  427 int     tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *,
  428             struct componentname *, char *);
  429 void    tmpfs_check_mtime(struct vnode *);
  430 void    tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *);
  431 void    tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *);
  432 void    tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *);
  433 struct tmpfs_dirent *   tmpfs_dir_lookup(struct tmpfs_node *node,
  434                             struct tmpfs_node *f,
  435                             struct componentname *cnp);
  436 int     tmpfs_dir_getdents(struct tmpfs_mount *, struct tmpfs_node *,
  437             struct uio *, int, u_long *, int *);
  438 int     tmpfs_dir_whiteout_add(struct vnode *, struct componentname *);
  439 void    tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *);
  440 int     tmpfs_reg_resize(struct vnode *, off_t, boolean_t);
  441 int     tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *);
  442 int     tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *);
  443 int     tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *,
  444             struct thread *);
  445 int     tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *);
  446 int     tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred,
  447             struct thread *);
  448 void    tmpfs_itimes(struct vnode *, const struct timespec *,
  449             const struct timespec *);
  450 
  451 void    tmpfs_set_status(struct tmpfs_mount *tm, struct tmpfs_node *node,
  452             int status);
  453 void    tmpfs_update(struct vnode *);
  454 int     tmpfs_truncate(struct vnode *, off_t);
  455 struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode,
  456             struct tmpfs_dir_cursor *dc);
  457 struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode,
  458             struct tmpfs_dir_cursor *dc);
  459 
  460 /*
  461  * Convenience macros to simplify some logical expressions.
  462  */
  463 #define IMPLIES(a, b) (!(a) || (b))
  464 #define IFF(a, b) (IMPLIES(a, b) && IMPLIES(b, a))
  465 
  466 /*
  467  * Checks that the directory entry pointed by 'de' matches the name 'name'
  468  * with a length of 'len'.
  469  */
  470 #define TMPFS_DIRENT_MATCHES(de, name, len) \
  471     (de->td_namelen == len && \
  472     bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0)
  473 
  474 /*
  475  * Ensures that the node pointed by 'node' is a directory and that its
  476  * contents are consistent with respect to directories.
  477  */
  478 #define TMPFS_VALIDATE_DIR(node) do { \
  479         MPASS((node)->tn_type == VDIR); \
  480         MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \
  481 } while (0)
  482 
  483 /*
  484  * Amount of memory pages to reserve for the system (e.g., to not use by
  485  * tmpfs).
  486  */
  487 #define TMPFS_PAGES_MINRESERVED         (4 * 1024 * 1024 / PAGE_SIZE)
  488 
  489 size_t tmpfs_mem_avail(void);
  490 size_t tmpfs_pages_used(struct tmpfs_mount *tmp);
  491 void tmpfs_subr_init(void);
  492 void tmpfs_subr_uninit(void);
  493 
  494 /*
  495  * Macros/functions to convert from generic data structures to tmpfs
  496  * specific ones.
  497  */
  498 
  499 static inline struct tmpfs_mount *
  500 VFS_TO_TMPFS(struct mount *mp)
  501 {
  502         struct tmpfs_mount *tmp;
  503 
  504         MPASS(mp != NULL && mp->mnt_data != NULL);
  505         tmp = (struct tmpfs_mount *)mp->mnt_data;
  506         return (tmp);
  507 }
  508 
  509 static inline struct tmpfs_node *
  510 VP_TO_TMPFS_NODE(struct vnode *vp)
  511 {
  512         struct tmpfs_node *node;
  513 
  514         MPASS(vp != NULL && vp->v_data != NULL);
  515         node = (struct tmpfs_node *)vp->v_data;
  516         return (node);
  517 }
  518 
  519 static inline struct tmpfs_node *
  520 VP_TO_TMPFS_DIR(struct vnode *vp)
  521 {
  522         struct tmpfs_node *node;
  523 
  524         node = VP_TO_TMPFS_NODE(vp);
  525         TMPFS_VALIDATE_DIR(node);
  526         return (node);
  527 }
  528 
  529 static inline bool
  530 tmpfs_use_nc(struct vnode *vp)
  531 {
  532 
  533         return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc));
  534 }
  535 #endif /* _KERNEL */
  536 
  537 #endif /* _FS_TMPFS_TMPFS_H_ */

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