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  * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
    9  * 2005 program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _FS_TMPFS_TMPFS_H_
   36 #define _FS_TMPFS_TMPFS_H_
   37 
   38 #include <sys/dirent.h>
   39 #include <sys/mount.h>
   40 #include <sys/queue.h>
   41 #include <sys/vnode.h>
   42 #include <sys/file.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 
   46 #include <sys/malloc.h>
   47 #include <sys/systm.h>
   48 #include <sys/tree.h>
   49 #include <sys/vmmeter.h>
   50 #include <vm/swap_pager.h>
   51 
   52 MALLOC_DECLARE(M_TMPFSMNT);
   53 MALLOC_DECLARE(M_TMPFSNAME);
   54 
   55 /*
   56  * Internal representation of a tmpfs directory entry.
   57  */
   58 
   59 LIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent);
   60 
   61 struct tmpfs_dirent {
   62         /*
   63          * Depending on td_cookie flag entry can be of 3 types:
   64          * - regular -- no hash collisions, stored in RB-Tree
   65          * - duphead -- synthetic linked list head for dup entries
   66          * - dup -- stored in linked list instead of RB-Tree
   67          */
   68         union {
   69                 /* regular and duphead entry types */
   70                 RB_ENTRY(tmpfs_dirent)          td_entries;
   71 
   72                 /* dup entry type */
   73                 struct {
   74                         LIST_ENTRY(tmpfs_dirent) entries;
   75                         LIST_ENTRY(tmpfs_dirent) index_entries;
   76                 } td_dup;
   77         } uh;
   78 
   79         uint32_t                        td_cookie;
   80         uint32_t                        td_hash;
   81         u_int                           td_namelen;
   82 
   83         /*
   84          * Pointer to the node this entry refers to.  In case this field
   85          * is NULL, the node is a whiteout.
   86          */
   87         struct tmpfs_node *             td_node;
   88 
   89         union {
   90                 /*
   91                  * The name of the entry, allocated from a string pool.  This
   92                  * string is not required to be zero-terminated.
   93                  */
   94                 char *                  td_name;        /* regular, dup */
   95                 struct tmpfs_dir_duphead td_duphead;    /* duphead */
   96         } ud;
   97 };
   98 
   99 /*
  100  * A directory in tmpfs holds a collection of directory entries, which
  101  * in turn point to other files (which can be directories themselves).
  102  *
  103  * In tmpfs, this collection is managed by a RB-Tree, whose head is
  104  * defined by the struct tmpfs_dir type.
  105  *
  106  * It is important to notice that directories do not have entries for . and
  107  * .. as other file systems do.  These can be generated when requested
  108  * based on information available by other means, such as the pointer to
  109  * the node itself in the former case or the pointer to the parent directory
  110  * in the latter case.  This is done to simplify tmpfs's code and, more
  111  * importantly, to remove redundancy.
  112  */
  113 RB_HEAD(tmpfs_dir, tmpfs_dirent);
  114 
  115 /*
  116  * Each entry in a directory has a cookie that identifies it.  Cookies
  117  * supersede offsets within directories because, given how tmpfs stores
  118  * directories in memory, there is no such thing as an offset.
  119  *
  120  * The '.', '..' and the end of directory markers have fixed cookies which
  121  * cannot collide with the cookies generated by other entries.  The cookies
  122  * for the other entries are generated based on the file name hash value or
  123  * unique number in case of name hash collision.
  124  *
  125  * To preserve compatibility cookies are limited to 31 bits.
  126  */
  127 
  128 #define TMPFS_DIRCOOKIE_DOT             0
  129 #define TMPFS_DIRCOOKIE_DOTDOT          1
  130 #define TMPFS_DIRCOOKIE_EOF             2
  131 #define TMPFS_DIRCOOKIE_MASK            ((off_t)0x3fffffffU)
  132 #define TMPFS_DIRCOOKIE_MIN             ((off_t)0x00000004U)
  133 #define TMPFS_DIRCOOKIE_DUP             ((off_t)0x40000000U)
  134 #define TMPFS_DIRCOOKIE_DUPHEAD         ((off_t)0x80000000U)
  135 #define TMPFS_DIRCOOKIE_DUP_MIN         TMPFS_DIRCOOKIE_DUP
  136 #define TMPFS_DIRCOOKIE_DUP_MAX         \
  137         (TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK)
  138 
  139 /*
  140  * Internal representation of a tmpfs file system node.
  141  *
  142  * This structure is splitted in two parts: one holds attributes common
  143  * to all file types and the other holds data that is only applicable to
  144  * a particular type.  The code must be careful to only access those
  145  * attributes that are actually allowed by the node's type.
  146  *
  147  * Below is the key of locks used to protected the fields in the following
  148  * structures.
  149  * (v)  vnode lock in exclusive mode
  150  * (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and
  151  *      tn_interlock
  152  * (i)  tn_interlock
  153  * (m)  tmpfs_mount tm_allnode_lock
  154  * (c)  stable after creation
  155  */
  156 struct tmpfs_node {
  157         /*
  158          * Doubly-linked list entry which links all existing nodes for
  159          * a single file system.  This is provided to ease the removal
  160          * of all nodes during the unmount operation, and to support
  161          * the implementation of VOP_VNTOCNP().  tn_attached is false
  162          * when the node is removed from list and unlocked.
  163          */
  164         LIST_ENTRY(tmpfs_node)  tn_entries;     /* (m) */
  165         bool                    tn_attached;    /* (m) */
  166 
  167         /*
  168          * The node's type.  Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO',
  169          * 'VLNK', 'VREG' and 'VSOCK' is allowed.  The usage of vnode
  170          * types instead of a custom enumeration is to make things simpler
  171          * and faster, as we do not need to convert between two types.
  172          */
  173         enum vtype              tn_type;        /* (c) */
  174 
  175         /* Node identifier. */
  176         ino_t                   tn_id;          /* (c) */
  177 
  178         /*
  179          * Node's internal status.  This is used by several file system
  180          * operations to do modifications to the node in a delayed
  181          * fashion.
  182          */
  183         int                     tn_status;      /* (vi) */
  184 #define TMPFS_NODE_ACCESSED     (1 << 1)
  185 #define TMPFS_NODE_MODIFIED     (1 << 2)
  186 #define TMPFS_NODE_CHANGED      (1 << 3)
  187 
  188         /*
  189          * The node size.  It does not necessarily match the real amount
  190          * of memory consumed by it.
  191          */
  192         off_t                   tn_size;        /* (v) */
  193 
  194         /* Generic node attributes. */
  195         uid_t                   tn_uid;         /* (v) */
  196         gid_t                   tn_gid;         /* (v) */
  197         mode_t                  tn_mode;        /* (v) */
  198         u_long                  tn_flags;       /* (v) */
  199         nlink_t                 tn_links;       /* (v) */
  200         struct timespec         tn_atime;       /* (vi) */
  201         struct timespec         tn_mtime;       /* (vi) */
  202         struct timespec         tn_ctime;       /* (vi) */
  203         struct timespec         tn_birthtime;   /* (v) */
  204         unsigned long           tn_gen;         /* (c) */
  205 
  206         /*
  207          * As there is a single vnode for each active file within the
  208          * system, care has to be taken to avoid allocating more than one
  209          * vnode per file.  In order to do this, a bidirectional association
  210          * is kept between vnodes and nodes.
  211          *
  212          * Whenever a vnode is allocated, its v_data field is updated to
  213          * point to the node it references.  At the same time, the node's
  214          * tn_vnode field is modified to point to the new vnode representing
  215          * it.  Further attempts to allocate a vnode for this same node will
  216          * result in returning a new reference to the value stored in
  217          * tn_vnode.
  218          *
  219          * May be NULL when the node is unused (that is, no vnode has been
  220          * allocated for it or it has been reclaimed).
  221          */
  222         struct vnode *          tn_vnode;       /* (i) */
  223 
  224         /*
  225          * Interlock to protect tn_vpstate, and tn_status under shared
  226          * vnode lock.
  227          */
  228         struct mtx      tn_interlock;
  229 
  230         /*
  231          * Identify if current node has vnode assiocate with
  232          * or allocating vnode.
  233          */
  234         int             tn_vpstate;             /* (i) */
  235 
  236         /* Transient refcounter on this node. */
  237         u_int           tn_refcount;            /* (m) + (i) */
  238 
  239         /* misc data field for different tn_type node */
  240         union {
  241                 /* Valid when tn_type == VBLK || tn_type == VCHR. */
  242                 dev_t                   tn_rdev;        /* (c) */
  243 
  244                 /* Valid when tn_type == VDIR. */
  245                 struct tn_dir {
  246                         /*
  247                          * Pointer to the parent directory.  The root
  248                          * directory has a pointer to itself in this field;
  249                          * this property identifies the root node.
  250                          */
  251                         struct tmpfs_node *     tn_parent;
  252 
  253                         /*
  254                          * Head of a tree that links the contents of
  255                          * the directory together.
  256                          */
  257                         struct tmpfs_dir        tn_dirhead;
  258 
  259                         /*
  260                          * Head of a list the contains fake directory entries
  261                          * heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD
  262                          * flag.
  263                          */
  264                         struct tmpfs_dir_duphead tn_dupindex;
  265 
  266                         /*
  267                          * Number and pointer of the first directory entry
  268                          * returned by the readdir operation if it were
  269                          * called again to continue reading data from the
  270                          * same directory as before.  This is used to speed
  271                          * up reads of long directories, assuming that no
  272                          * more than one read is in progress at a given time.
  273                          * Otherwise, these values are discarded.
  274                          */
  275                         off_t                   tn_readdir_lastn;
  276                         struct tmpfs_dirent *   tn_readdir_lastp;
  277                 } tn_dir;
  278 
  279                 /* Valid when tn_type == VLNK. */
  280                 /* The link's target, allocated from a string pool. */
  281                 char *                  tn_link;        /* (c) */
  282 
  283                 /* Valid when tn_type == VREG. */
  284                 struct tn_reg {
  285                         /*
  286                          * The contents of regular files stored in a
  287                          * tmpfs file system are represented by a
  288                          * single anonymous memory object (aobj, for
  289                          * short).  The aobj provides direct access to
  290                          * any position within the file.  It is a task
  291                          * of the memory management subsystem to issue
  292                          * the required page ins or page outs whenever
  293                          * a position within the file is accessed.
  294                          */
  295                         vm_object_t             tn_aobj;        /* (c) */
  296                 } tn_reg;
  297         } tn_spec;      /* (v) */
  298 };
  299 LIST_HEAD(tmpfs_node_list, tmpfs_node);
  300 
  301 #define tn_rdev tn_spec.tn_rdev
  302 #define tn_dir tn_spec.tn_dir
  303 #define tn_link tn_spec.tn_link
  304 #define tn_reg tn_spec.tn_reg
  305 #define tn_fifo tn_spec.tn_fifo
  306 
  307 #define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock)
  308 #define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock)
  309 #define TMPFS_NODE_MTX(node) (&(node)->tn_interlock)
  310 #define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \
  311     MA_OWNED)
  312 
  313 #ifdef INVARIANTS
  314 #define TMPFS_ASSERT_LOCKED(node) do {                                  \
  315                 MPASS((node) != NULL);                                  \
  316                 MPASS((node)->tn_vnode != NULL);                        \
  317                 ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert");    \
  318         } while (0)
  319 #else
  320 #define TMPFS_ASSERT_LOCKED(node) (void)0
  321 #endif
  322 
  323 #define TMPFS_VNODE_ALLOCATING  1
  324 #define TMPFS_VNODE_WANT        2
  325 #define TMPFS_VNODE_DOOMED      4
  326 #define TMPFS_VNODE_WRECLAIM    8
  327 
  328 /*
  329  * Internal representation of a tmpfs mount point.
  330  */
  331 struct tmpfs_mount {
  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 unrhdr *         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         /* Zones used to store file system meta data, per tmpfs mount. */
  382         uma_zone_t              tm_dirent_pool;
  383         uma_zone_t              tm_node_pool;
  384 
  385         /* Read-only status. */
  386         bool                    tm_ronly;
  387         /* Do not use namecache. */
  388         bool                    tm_nonc;
  389 };
  390 #define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock)
  391 #define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock)
  392 #define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED)
  393 
  394 /*
  395  * This structure maps a file identifier to a tmpfs node.  Used by the
  396  * NFS code.
  397  */
  398 struct tmpfs_fid {
  399         uint16_t                tf_len;
  400         uint16_t                tf_pad;
  401         ino_t                   tf_id;
  402         unsigned long           tf_gen;
  403 };
  404 
  405 struct tmpfs_dir_cursor {
  406         struct tmpfs_dirent     *tdc_current;
  407         struct tmpfs_dirent     *tdc_tree;
  408 };
  409 
  410 #ifdef _KERNEL
  411 /*
  412  * Prototypes for tmpfs_subr.c.
  413  */
  414 
  415 void    tmpfs_ref_node(struct tmpfs_node *node);
  416 void    tmpfs_ref_node_locked(struct tmpfs_node *node);
  417 int     tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, enum vtype,
  418             uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *,
  419             char *, dev_t, struct tmpfs_node **);
  420 void    tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *);
  421 bool    tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool);
  422 void    tmpfs_free_tmp(struct tmpfs_mount *);
  423 int     tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *,
  424             const char *, u_int, struct tmpfs_dirent **);
  425 void    tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *);
  426 void    tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int);
  427 void    tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj);
  428 int     tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int,
  429             struct vnode **);
  430 void    tmpfs_free_vp(struct vnode *);
  431 int     tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *,
  432             struct componentname *, char *);
  433 void    tmpfs_check_mtime(struct vnode *);
  434 void    tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *);
  435 void    tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *);
  436 void    tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *);
  437 struct tmpfs_dirent *   tmpfs_dir_lookup(struct tmpfs_node *node,
  438                             struct tmpfs_node *f,
  439                             struct componentname *cnp);
  440 int     tmpfs_dir_getdents(struct tmpfs_node *, struct uio *, int,
  441             u_long *, int *);
  442 int     tmpfs_dir_whiteout_add(struct vnode *, struct componentname *);
  443 void    tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *);
  444 int     tmpfs_reg_resize(struct vnode *, off_t, boolean_t);
  445 int     tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *);
  446 int     tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *);
  447 int     tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *,
  448             struct thread *);
  449 int     tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *);
  450 int     tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred,
  451             struct thread *);
  452 void    tmpfs_itimes(struct vnode *, const struct timespec *,
  453             const struct timespec *);
  454 
  455 void    tmpfs_set_status(struct tmpfs_node *node, int status);
  456 void    tmpfs_update(struct vnode *);
  457 int     tmpfs_truncate(struct vnode *, off_t);
  458 struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode,
  459             struct tmpfs_dir_cursor *dc);
  460 struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode,
  461             struct tmpfs_dir_cursor *dc);
  462 
  463 /*
  464  * Convenience macros to simplify some logical expressions.
  465  */
  466 #define IMPLIES(a, b) (!(a) || (b))
  467 #define IFF(a, b) (IMPLIES(a, b) && IMPLIES(b, a))
  468 
  469 /*
  470  * Checks that the directory entry pointed by 'de' matches the name 'name'
  471  * with a length of 'len'.
  472  */
  473 #define TMPFS_DIRENT_MATCHES(de, name, len) \
  474     (de->td_namelen == len && \
  475     bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0)
  476 
  477 /*
  478  * Ensures that the node pointed by 'node' is a directory and that its
  479  * contents are consistent with respect to directories.
  480  */
  481 #define TMPFS_VALIDATE_DIR(node) do { \
  482         MPASS((node)->tn_type == VDIR); \
  483         MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \
  484 } while (0)
  485 
  486 /*
  487  * Amount of memory pages to reserve for the system (e.g., to not use by
  488  * tmpfs).
  489  */
  490 #define TMPFS_PAGES_MINRESERVED         (4 * 1024 * 1024 / PAGE_SIZE)
  491 
  492 size_t tmpfs_mem_avail(void);
  493 
  494 size_t tmpfs_pages_used(struct tmpfs_mount *tmp);
  495 
  496 #endif
  497 
  498 /*
  499  * Macros/functions to convert from generic data structures to tmpfs
  500  * specific ones.
  501  */
  502 
  503 static inline struct tmpfs_mount *
  504 VFS_TO_TMPFS(struct mount *mp)
  505 {
  506         struct tmpfs_mount *tmp;
  507 
  508         MPASS(mp != NULL && mp->mnt_data != NULL);
  509         tmp = (struct tmpfs_mount *)mp->mnt_data;
  510         return (tmp);
  511 }
  512 
  513 static inline struct tmpfs_node *
  514 VP_TO_TMPFS_NODE(struct vnode *vp)
  515 {
  516         struct tmpfs_node *node;
  517 
  518         MPASS(vp != NULL && vp->v_data != NULL);
  519         node = (struct tmpfs_node *)vp->v_data;
  520         return (node);
  521 }
  522 
  523 static inline struct tmpfs_node *
  524 VP_TO_TMPFS_DIR(struct vnode *vp)
  525 {
  526         struct tmpfs_node *node;
  527 
  528         node = VP_TO_TMPFS_NODE(vp);
  529         TMPFS_VALIDATE_DIR(node);
  530         return (node);
  531 }
  532 
  533 static inline bool
  534 tmpfs_use_nc(struct vnode *vp)
  535 {
  536 
  537         return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc));
  538 }
  539 
  540 #endif /* _FS_TMPFS_TMPFS_H_ */

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