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Diffstat (limited to 'services/nfsclient/nfs.c')
| -rw-r--r-- | services/nfsclient/nfs.c | 3051 |
1 files changed, 3051 insertions, 0 deletions
diff --git a/services/nfsclient/nfs.c b/services/nfsclient/nfs.c new file mode 100644 index 00000000..bbec6b80 --- /dev/null +++ b/services/nfsclient/nfs.c @@ -0,0 +1,3051 @@ +/* NFS client implementation for RTEMS; hooks into the RTEMS filesystem */ + +/* Author: Till Straumann <strauman@slac.stanford.edu> 2002 */ + +/* + * Hacked on by others. + * + * Modifications to support reference counting in the file system are + * Copyright (c) 2012 embedded brains GmbH. + */ + +/* + * Authorship + * ---------- + * This software (NFS-2 client implementation for RTEMS) was created by + * Till Straumann <strauman@slac.stanford.edu>, 2002-2007, + * Stanford Linear Accelerator Center, Stanford University. + * + * Acknowledgement of sponsorship + * ------------------------------ + * The NFS-2 client implementation for RTEMS was produced by + * the Stanford Linear Accelerator Center, Stanford University, + * under Contract DE-AC03-76SFO0515 with the Department of Energy. + * + * Government disclaimer of liability + * ---------------------------------- + * Neither the United States nor the United States Department of Energy, + * nor any of their employees, makes any warranty, express or implied, or + * assumes any legal liability or responsibility for the accuracy, + * completeness, or usefulness of any data, apparatus, product, or process + * disclosed, or represents that its use would not infringe privately owned + * rights. + * + * Stanford disclaimer of liability + * -------------------------------- + * Stanford University makes no representations or warranties, express or + * implied, nor assumes any liability for the use of this software. + * + * Stanford disclaimer of copyright + * -------------------------------- + * Stanford University, owner of the copyright, hereby disclaims its + * copyright and all other rights in this software. Hence, anyone may + * freely use it for any purpose without restriction. + * + * Maintenance of notices + * ---------------------- + * In the interest of clarity regarding the origin and status of this + * SLAC software, this and all the preceding Stanford University notices + * are to remain affixed to any copy or derivative of this software made + * or distributed by the recipient and are to be affixed to any copy of + * software made or distributed by the recipient that contains a copy or + * derivative of this software. + * + * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <rtems.h> +#include <rtems/libio.h> +#include <rtems/libio_.h> +#include <rtems/seterr.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <assert.h> +#include <sys/stat.h> +#include <dirent.h> +#include <netdb.h> +#include <ctype.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <nfs_prot.h> +#include <mount_prot.h> + +#include "rpcio.h" +#include "librtemsNfs.h" + +/* Configurable parameters */ + +/* Estimated average length of a filename (including terminating 0). + * This was calculated by doing + * + * find <some root> -print -exec basename '{}' \; > feil + * wc feil + * + * AVG_NAMLEN = (num_chars + num_lines)/num_lines + */ +#define CONFIG_AVG_NAMLEN 10 + +#define CONFIG_NFS_SMALL_XACT_SIZE 800 /* size of RPC arguments for non-write ops */ +/* lifetime of NFS attributes in a NfsNode; + * the time is in seconds and the lifetime is + * infinite if the symbol is #undef + */ +#define CONFIG_ATTR_LIFETIME 10/*secs*/ + +/* + * The 'st_blksize' (stat(2)) value this nfs + * client should report. If set to zero then the server's fattr data + * is passed throught which is not necessary optimal. + * Newlib's stdio uses 'st_blksize' (if built with HAVE_BLKSIZE defined) + * to size the default buffer. + * Due to the overhead of NFS it is probably better to use the maximum + * size of an NFS read request (8k) rather than the optimal block + * size on the server. + * This value can be overridden at run-time by setting the global + * variable 'nfsStBlksize'. + * Thanks to Steven Johnson <sjohnson@sakuraindustries.com> for helping + * working on this issue. + */ +#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA + +/* dont change this without changing the maximal write size */ +#define CONFIG_NFS_BIG_XACT_SIZE UDPMSGSIZE /* dont change this */ + +/* The real values for these are specified further down */ +#define NFSCALL_TIMEOUT (&_nfscalltimeout) +#define MNTCALL_TIMEOUT (&_nfscalltimeout) +static struct timeval _nfscalltimeout = { 10, 0 }; /* {secs, us } */ + +/* More or less fixed constants; in particular, NFS3 is not supported */ +#define DELIM '/' +#define HOSTDELIM ':' +#define UPDIR ".." +#define UIDSEP '@' +#define NFS_VERSION_2 NFS_VERSION + +/* we use a dynamically assigned major number */ +#define NFS_MAJOR (nfsGlob.nfs_major) + + +/* NOTE: RTEMS (ss-20020301) uses a 'short st_ino' type :-( but the + * NFS fileid is 32 bit. [Later versions of RTEMS have fixed this; + * nfsInit() issues a warning if you run a version with 'short st_ino'.] + * + * As a workarount, we merge the upper 16bits of the fileid into the + * minor device no. Hence, it is still possible to uniquely identify + * a file by looking at its device number (major = nfs, minor = part + * of the fileid + our 'nfs-id' identifier). + * + * This has an impact on performance, as e.g. getcwd() stats() all + * directory entries when it believes it has crossed a mount point + * (a.st_dev != b.st_dev). + * + * OTOH, it also might cause node comparison failure! E.g. 'getcwd()' + * assumes that two nodes residing in the same directory must be located + * on the same device and hence compares 'st_ino' only. + * If two files in the same directory have the same inode number + * modulo 2^16, they will be considered equal (although their device + * number doesn't match - getcwd doesn't look at it). + * + * Other software might or might not be affected. + * + * The only clean solution to this problem is bumping up the size of + * 'ino_t' at least to 'long'. + * Note that this requires _all_ software (libraries etc.) to be + * recompiled. + */ + +#define NFS_MAKE_DEV_T_INO_HACK(node) \ + rtems_filesystem_make_dev_t( NFS_MAJOR, \ + (((rtems_device_minor_number)((node)->nfs->id))<<16) | (((rtems_device_minor_number)SERP_ATTR((node)).fileid) >> 16) ) + +/* use our 'nfs id' and the server's fsid for the minor device number + * this should be fairly unique + */ +#define NFS_MAKE_DEV_T(node) \ + rtems_filesystem_make_dev_t( NFS_MAJOR, \ + (((rtems_device_minor_number)((node)->nfs->id))<<16) | (SERP_ATTR((node)).fsid & (((rtems_device_minor_number)1<<16)-1)) ) + +#define DIRENT_HEADER_SIZE ( sizeof(struct dirent) - \ + sizeof( ((struct dirent *)0)->d_name ) ) + + +/* debugging flags */ +#define DEBUG_COUNT_NODES (1<<0) +#define DEBUG_TRACK_NODES (1<<1) +#define DEBUG_EVALPATH (1<<2) +#define DEBUG_READDIR (1<<3) +#define DEBUG_SYSCALLS (1<<4) + +/* #define DEBUG ( DEBUG_SYSCALLS | DEBUG_COUNT_NODES ) */ + +#ifdef DEBUG +#define STATIC +#else +#define STATIC static +#endif + +#define MUTEX_ATTRIBUTES (RTEMS_LOCAL | \ + RTEMS_PRIORITY | \ + RTEMS_INHERIT_PRIORITY | \ + RTEMS_BINARY_SEMAPHORE) + +#define LOCK(s) do { \ + rtems_semaphore_obtain((s), \ + RTEMS_WAIT, \ + RTEMS_NO_TIMEOUT); \ + } while (0) + +#define UNLOCK(s) do { rtems_semaphore_release((s)); \ + } while (0) + +static inline char * +nfs_dupname(const char *name, size_t namelen) +{ + char *dupname = malloc(namelen + 1); + + if (dupname != NULL) { + memcpy(dupname, name, namelen); + dupname [namelen] = '\0'; + } else { + errno = ENOMEM; + } + + return dupname; +} + +/***************************************** + Types with Associated XDR Routines + *****************************************/ + +/* a string buffer with a maximal length. + * If the buffer pointer is NULL, it is updated + * with an appropriately allocated area. + */ +typedef struct strbuf { + char *buf; + u_int max; +} strbuf; + +/* Read 'readlink' results into a 'strbuf'. + * This is convenient as it avoids + * one extra step of copying / lenght + * checking. + */ +typedef struct readlinkres_strbuf { + nfsstat status; + strbuf strbuf; +} readlinkres_strbuf; + +static bool_t +xdr_readlinkres_strbuf(XDR *xdrs, readlinkres_strbuf *objp) +{ + if ( !xdr_nfsstat(xdrs, &objp->status) ) + return FALSE; + + if ( NFS_OK == objp->status ) { + if ( !xdr_string(xdrs, &objp->strbuf.buf, objp->strbuf.max) ) + return FALSE; + } + return TRUE; +} + + +/* DirInfoRec is used instead of dirresargs + * to convert recursion into iteration. The + * 'rpcgen'erated xdr_dirresargs ends up + * doing nested calls when unpacking the + * 'next' pointers. + */ + +typedef struct DirInfoRec_ { + readdirargs readdirargs; + /* clone of the 'readdirres' fields; + * the cookie is put into the readdirargs above + */ + nfsstat status; + char *buf, *ptr; + int len; + bool_t eofreached; +} DirInfoRec, *DirInfo; + +/* this deals with one entry / record */ +static bool_t +xdr_dir_info_entry(XDR *xdrs, DirInfo di) +{ +union { + char nambuf[NFS_MAXNAMLEN+1]; + nfscookie cookie; +} dummy; +struct dirent *pde = (struct dirent *)di->ptr; +u_int fileid; +char *name; +register int nlen = 0,len,naligned = 0; +nfscookie *pcookie; + + len = di->len; + + if ( !xdr_u_int(xdrs, &fileid) ) + return FALSE; + + /* we must pass the address of a char* */ + name = (len > NFS_MAXNAMLEN) ? pde->d_name : dummy.nambuf; + + if ( !xdr_filename(xdrs, &name) ) { + return FALSE; + } + + if (len >= 0) { + nlen = strlen(name); + naligned = nlen + 1 /* string delimiter */ + 3 /* alignment */; + naligned &= ~3; + len -= naligned; + } + + /* if the cookie goes into the DirInfo, we hope this doesn't fail + * - the caller ends up with an invalid readdirargs cookie otherwise... + */ + pcookie = (len >= 0) ? &di->readdirargs.cookie : &dummy.cookie; + if ( !xdr_nfscookie(xdrs, pcookie) ) { + return FALSE; + } + + di->len = len; + /* adjust the buffer pointer */ + if (len >= 0) { + pde->d_ino = fileid; + pde->d_namlen = nlen; + pde->d_off = di->ptr - di->buf; + if (name == dummy.nambuf) { + memcpy(pde->d_name, dummy.nambuf, nlen + 1); + } + pde->d_reclen = DIRENT_HEADER_SIZE + naligned; + di->ptr += pde->d_reclen; + } + + return TRUE; +} + +/* this routine loops over all entries */ +static bool_t +xdr_dir_info(XDR *xdrs, DirInfo di) +{ +DirInfo dip; + + if ( !xdr_nfsstat(xdrs, &di->status) ) + return FALSE; + + if ( NFS_OK != di->status ) + return TRUE; + + dip = di; + + while (dip) { + /* reserve space for the dirent 'header' - we assume it's word aligned! */ +#ifdef DEBUG + assert( DIRENT_HEADER_SIZE % 4 == 0 ); +#endif + dip->len -= DIRENT_HEADER_SIZE; + + /* we pass a 0 size - size is unused since + * we always pass a non-NULL pointer + */ + if ( !xdr_pointer(xdrs, (void*)&dip, 0 /* size */, (xdrproc_t)xdr_dir_info_entry) ) + return FALSE; + } + + if ( ! xdr_bool(xdrs, &di->eofreached) ) + return FALSE; + + /* if everything fits into the XDR buffer but not the user's buffer, + * they must resume reading from where xdr_dir_info_entry() started + * skipping and 'eofreached' needs to be adjusted + */ + if ( di->len < 0 && di->eofreached ) + di->eofreached = FALSE; + + return TRUE; +} + + +/* a type better suited for node operations + * than diropres. + * fattr and fhs are swapped so parts of this + * structure may be used as a diroparg which + * is practical when looking up paths. + */ + +/* Macro for accessing serporid fields + */ +#define SERP_ARGS(node) ((node)->serporid.serporid_u.serporid.arg_u) +#define SERP_ATTR(node) ((node)->serporid.serporid_u.serporid.attributes) +#define SERP_FILE(node) ((node)->serporid.serporid_u.serporid.file) + + +typedef struct serporidok { + fattr attributes; + nfs_fh file; + union { + struct { + filename name; + } diroparg; + struct { + sattr attributes; + } sattrarg; + struct { + uint32_t offset; + uint32_t count; + uint32_t totalcount; + } readarg; + struct { + uint32_t beginoffset; + uint32_t offset; + uint32_t totalcount; + struct { + uint32_t data_len; + char* data_val; + } data; + } writearg; + struct { + filename name; + sattr attributes; + } createarg; + struct { + filename name; + diropargs to; + } renamearg; + struct { + diropargs to; + } linkarg; + struct { + filename name; + nfspath to; + sattr attributes; + } symlinkarg; + struct { + nfscookie cookie; + uint32_t count; + } readdirarg; + } arg_u; +} serporidok; + +typedef struct serporid { + nfsstat status; + union { + serporidok serporid; + } serporid_u; +} serporid; + +/* an XDR routine to encode/decode the inverted diropres + * into an nfsnodestat; + * + * NOTE: this routine only acts on + * - 'serporid.status' + * - 'serporid.file' + * - 'serporid.attributes' + * and leaves the 'arg_u' alone. + * + * The idea is that a 'diropres' is read into 'serporid' + * which can then be used as an argument to subsequent + * NFS-RPCs (after filling in the node's arg_u). + */ +static bool_t +xdr_serporidok(XDR *xdrs, serporidok *objp) +{ + if (!xdr_nfs_fh (xdrs, &objp->file)) + return FALSE; + if (!xdr_fattr (xdrs, &objp->attributes)) + return FALSE; + return TRUE; +} + +static bool_t +xdr_serporid(XDR *xdrs, serporid *objp) +{ + if (!xdr_nfsstat (xdrs, &objp->status)) + return FALSE; + switch (objp->status) { + case NFS_OK: + if (!xdr_serporidok(xdrs, &objp->serporid_u.serporid)) + return FALSE; + break; + default: + break; + } + return TRUE; +} + +/***************************************** + Data Structures and Types + *****************************************/ + +/* 'time()' hack with less overhead; */ + +/* assume reading a long word is atomic */ +#define READ_LONG_IS_ATOMIC + +typedef uint32_t TimeStamp; + +static inline TimeStamp +nowSeconds(void) +{ + rtems_interval rval; + rtems_clock_get_seconds_since_epoch( &rval ); + return rval; +} + + +/* Per mounted FS structure */ +typedef struct NfsRec_ { + /* the NFS server we're talking to. + */ + RpcUdpServer server; + /* statistics; how many NfsNodes are + * currently alive. + */ + volatile int nodesInUse; +#if DEBUG & DEBUG_COUNT_NODES + /* statistics; how many 'NfsNode.str' + * strings are currently allocated. + */ + volatile int stringsInUse; +#endif + /* A small number who uniquely + * identifies a mounted NFS within + * this driver (i.e. this NfsRec). + * Each time a NFS is mounted, the + * global ID counter is incremented + * and its value is assigned to the + * newly created NfsRec. + */ + u_short id; + /* Our RTEMS filesystem mt_entry + */ + rtems_filesystem_mount_table_entry_t *mt_entry; + /* Next NfsRec on a linked list who + * is anchored at nfsGlob + */ + struct NfsRec_ *next; + /* Who we pretend we are + */ + u_long uid,gid; +} NfsRec, *Nfs; + +typedef struct NfsNodeRec_ { + /* This holds this node's attributes + * (stats) and its nfs filehandle. + * It also contains room for nfs rpc + * arguments. + */ + serporid serporid; + /* The arguments we used when doing + * the 'lookup' call for this node. + * We need this information (especially + * the directory FH) for performing + * certain operations on this + * node (in particular: for unlinking + * it from a parent directory) + */ + diropargs args; + /* FS this node belongs to + */ + Nfs nfs; + /* A buffer for the string the + * args.name points to. + * We need this because args.name might + * temporarily point to strings on the + * stack. Duplicates are allocated from + * the heap and attached to 'str' so + * they can be released as appropriate. + */ + char *str; + /* A timestamp for the stats + */ + TimeStamp age; +} NfsNodeRec, *NfsNode; + +/***************************************** + Forward Declarations + *****************************************/ + +static ssize_t nfs_readlink_with_node( + NfsNode node, + char *buf, + size_t len +); + +static int updateAttr(NfsNode node, int force); + +/* Mask bits when setting attributes. + * Only the 'arg' fields with their + * corresponding bit set in the mask + * will be used. The others are left + * unchanged. + * The 'TOUCH' bits instruct nfs_sattr() + * to update the respective time + * fields to the current time + */ +#define SATTR_MODE (1<<0) +#define SATTR_UID (1<<1) +#define SATTR_GID (1<<2) +#define SATTR_SIZE (1<<3) +#define SATTR_ATIME (1<<4) +#define SATTR_TOUCHA (1<<5) +#define SATTR_MTIME (1<<6) +#define SATTR_TOUCHM (1<<7) +#define SATTR_TOUCH (SATTR_TOUCHM | SATTR_TOUCHA) + +static int +nfs_sattr(NfsNode node, sattr *arg, u_long mask); + +extern const struct _rtems_filesystem_operations_table nfs_fs_ops; +static const struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers; +static const struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers; +static const struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers; +static rtems_driver_address_table drvNfs; + +int +nfsMountsShow(FILE*); + +rtems_status_code +rtems_filesystem_resolve_location(char *buf, int len, rtems_filesystem_location_info_t *loc); + +/***************************************** + Global Variables + *****************************************/ + +/* These are (except for MAXNAMLEN/MAXPATHLEN) copied from IMFS */ + +static const rtems_filesystem_limits_and_options_t +nfs_limits_and_options = { + 5, /* link_max */ + 6, /* max_canon */ + 7, /* max_input */ + NFS_MAXNAMLEN, /* name_max */ + NFS_MAXPATHLEN, /* path_max */ + 2, /* pipe_buf */ + 1, /* posix_async_io */ + 2, /* posix_chown_restrictions */ + 3, /* posix_no_trunc */ + 4, /* posix_prio_io */ + 5, /* posix_sync_io */ + 6 /* posix_vdisable */ +}; + +/* size of an encoded 'entry' object */ +static int dirres_entry_size; + +/* Global stuff and statistics */ +static struct nfsstats { + /* A lock for protecting the + * linked ist of mounted NFS + * and the num_mounted_fs field + */ + rtems_id llock; + /* A lock for protecting misc + * stuff within the driver. + * The lock must only be held + * for short periods of time. + */ + rtems_id lock; + /* Our major number as assigned + * by RTEMS + */ + rtems_device_major_number nfs_major; + /* The number of currently + * mounted NFS + */ + int num_mounted_fs; + /* A list of the currently + * mounted NFS + */ + struct NfsRec_ *mounted_fs; + /* A counter for allocating + * unique IDs to each mounted + * NFS. + * Assume we are not going to + * do more than 16k mounts + * during the system lifetime + */ + u_short fs_ids; +} nfsGlob = {0, 0, 0, 0, 0, 0}; + +/* + * Global variable to tune the 'st_blksize' (stat(2)) value this nfs + * client should report. + * size on the server. + */ +#ifndef DEFAULT_NFS_ST_BLKSIZE +#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA +#endif +int nfsStBlksize = DEFAULT_NFS_ST_BLKSIZE; + +/* Two pools of RPC transactions; + * One with small send buffers + * the other with a big one. + * The actual size of the small + * buffer is configurable (see top). + * + * Note: The RX buffers are always + * big + */ +static RpcUdpXactPool smallPool = 0; +static RpcUdpXactPool bigPool = 0; + + +/***************************************** + Implementation + *****************************************/ + +/* Create a Nfs object. This is + * per-mounted NFS information. + * + * ARGS: The Nfs server handle. + * + * RETURNS: Nfs on success, + * NULL on failure with + * errno set + * + * NOTE: The submitted server + * object is 'owned' by + * this Nfs and will be + * destroyed by nfsDestroy() + */ +static Nfs +nfsCreate(RpcUdpServer server) +{ +Nfs rval = calloc(1,sizeof(*rval)); + + if (rval) { + rval->server = server; + LOCK(nfsGlob.llock); + rval->next = nfsGlob.mounted_fs; + nfsGlob.mounted_fs = rval; + UNLOCK(nfsGlob.llock); + } else { + errno = ENOMEM; + } + return rval; +} + +/* Destroy an Nfs object and + * its associated server + */ +static void +nfsDestroy(Nfs nfs) +{ +register Nfs prev; + if (!nfs) + return; + + LOCK(nfsGlob.llock); + if (nfs == nfsGlob.mounted_fs) + nfsGlob.mounted_fs = nfs->next; + else { + for (prev = nfsGlob.mounted_fs; + prev && prev->next != nfs; + prev = prev->next) + /* nothing else to do */; + assert( prev ); + prev->next = nfs->next; + } + UNLOCK(nfsGlob.llock); + + nfs->next = 0; /* paranoia */ + rpcUdpServerDestroy(nfs->server); + free(nfs); +} + +/* + * Create a Node. The node will + * be associated with a particular + * mounted NFS identified by 'nfs' + * Optionally, a NFS file handle + * may be copied into this node. + * + * ARGS: nfs of the NFS this node + * belongs to. + * NFS file handle identifying + * this node. + * RETURNS: node on success, + * NULL on failure with errno + * set. + * + * NOTE: The caller of this routine + * is responsible for copying + * a NFS file handle if she + * choses to pass a NULL fh. + * + * The driver code assumes the + * a node always has a valid + * NFS filehandle and file + * attributes (unless the latter + * are aged). + */ +static NfsNode +nfsNodeCreate(Nfs nfs, fhandle *fh) +{ +NfsNode rval = malloc(sizeof(*rval)); +unsigned long flags; + +#if DEBUG & DEBUG_TRACK_NODES + fprintf(stderr,"NFS: creating a node\n"); +#endif + + if (rval) { + if (fh) + memcpy( &SERP_FILE(rval), fh, sizeof(*fh) ); + rtems_interrupt_disable(flags); + nfs->nodesInUse++; + rtems_interrupt_enable(flags); + rval->nfs = nfs; + rval->str = 0; + } else { + errno = ENOMEM; + } + + return rval; +} + +/* destroy a node */ +static void +nfsNodeDestroy(NfsNode node) +{ +unsigned long flags; + +#if DEBUG & DEBUG_TRACK_NODES + fprintf(stderr,"NFS: destroying a node\n"); +#endif +#if 0 + if (!node) + return; + /* this probably does nothing... */ + xdr_free(xdr_serporid, &node->serporid); +#endif + + rtems_interrupt_disable(flags); + node->nfs->nodesInUse--; +#if DEBUG & DEBUG_COUNT_NODES + if (node->str) + node->nfs->stringsInUse--; +#endif + rtems_interrupt_enable(flags); + + if (node->str) + free(node->str); + + free(node); +} + +/* Clone a given node (AKA copy constructor), + * i.e. create an exact copy. + * + * ARGS: node to clone + * RETURNS: new node on success + * NULL on failure with errno set. + * + * NOTE: a string attached to 'str' + * is cloned as well. Outdated + * attributes (of the new copy + * only) will be refreshed + * (if unsuccessful, this could + * be a reason for failure to + * clone a node). + */ +static NfsNode +nfsNodeClone(NfsNode node) +{ +NfsNode rval = nfsNodeCreate(node->nfs, 0); + + if (rval) { + *rval = *node; + + /* must clone the string also */ + if (node->str) { + rval->args.name = rval->str = strdup(node->str); + if (!rval->str) { + errno = ENOMEM; + nfsNodeDestroy(rval); + return 0; + } +#if DEBUG & DEBUG_COUNT_NODES + { unsigned long flags; + rtems_interrupt_disable(flags); + node->nfs->stringsInUse++; + rtems_interrupt_enable(flags); + } +#endif + } + + /* possibly update the stats */ + if (updateAttr(rval, 0 /* only if necessary */)) { + nfsNodeDestroy(rval); + return 0; + } + } + return rval; +} + +/* Initialize the driver. + * + * ARGS: depth of the small and big + * transaction pools, i.e. how + * many transactions (buffers) + * should always be kept around. + * + * (If more transactions are needed, + * they are created and destroyed + * on the fly). + */ +void +nfsInit(int smallPoolDepth, int bigPoolDepth) +{ +static int initialised = 0; +entry dummy; +rtems_status_code status; + + if (initialised) + return; + + initialised = 1; + + fprintf(stderr, + "RTEMS-NFS $Release$, " \ + "Till Straumann, Stanford/SLAC/SSRL 2002, " \ + "See LICENSE file for licensing info.\n"); + + /* Get a major number */ + + if (RTEMS_SUCCESSFUL != rtems_io_register_driver(0, &drvNfs, &nfsGlob.nfs_major)) { + fprintf(stderr,"Registering NFS driver failed - %s\n", strerror(errno)); + return; + } + + if (0==smallPoolDepth) + smallPoolDepth = 20; + if (0==bigPoolDepth) + bigPoolDepth = 10; + + /* it's crucial to zero out the 'next' pointer + * because it terminates the xdr_entry recursion + * + * we also must make the filename some non-zero + * char pointer! + */ + + memset(&dummy, 0, sizeof(dummy)); + + dummy.nextentry = 0; + dummy.name = "somename"; /* guess average length of a filename */ + dirres_entry_size = xdr_sizeof((xdrproc_t)xdr_entry, &dummy); + + smallPool = rpcUdpXactPoolCreate( + NFS_PROGRAM, + NFS_VERSION_2, + CONFIG_NFS_SMALL_XACT_SIZE, + smallPoolDepth); + assert( smallPool ); + + bigPool = rpcUdpXactPoolCreate( + NFS_PROGRAM, + NFS_VERSION_2, + CONFIG_NFS_BIG_XACT_SIZE, + bigPoolDepth); + assert( bigPool ); + + status = rtems_semaphore_create( + rtems_build_name('N','F','S','l'), + 1, + MUTEX_ATTRIBUTES, + 0, + &nfsGlob.llock); + assert( status == RTEMS_SUCCESSFUL ); + status = rtems_semaphore_create( + rtems_build_name('N','F','S','m'), + 1, + MUTEX_ATTRIBUTES, + 0, + &nfsGlob.lock); + assert( status == RTEMS_SUCCESSFUL ); + + if (sizeof(ino_t) < sizeof(u_int)) { + fprintf(stderr, + "WARNING: Using 'short st_ino' hits performance and may fail to access/find correct files\n"); + fprintf(stderr, + "you should fix newlib's sys/stat.h - for now I'll enable a hack...\n"); + + } +} + +/* Driver cleanup code + */ +int +nfsCleanup(void) +{ +rtems_id l; +int refuse; + + if (!nfsGlob.llock) { + /* registering the driver failed - let them still cleanup */ + return 0; + } + + LOCK(nfsGlob.llock); + if ( (refuse = nfsGlob.num_mounted_fs) ) { + fprintf(stderr,"Refuse to unload NFS; %i filesystems still mounted.\n", + refuse); + nfsMountsShow(stderr); + /* yes, printing is slow - but since you try to unload the driver, + * you assume nobody is using NFS, so what if they have to wait? + */ + UNLOCK(nfsGlob.llock); + return -1; + } + + rtems_semaphore_delete(nfsGlob.lock); + nfsGlob.lock = 0; + + /* hold the lock while cleaning up... */ + + rpcUdpXactPoolDestroy(smallPool); + rpcUdpXactPoolDestroy(bigPool); + l = nfsGlob.llock; + rtems_io_unregister_driver(nfsGlob.nfs_major); + + rtems_semaphore_delete(l); + nfsGlob.llock = 0; + return 0; +} + +/* NFS RPC wrapper. + * + * ARGS: srvr the NFS server we want to call + * proc the NFSPROC_xx we want to invoke + * xargs xdr routine to wrap the arguments + * pargs pointer to the argument object + * xres xdr routine to unwrap the results + * pres pointer to the result object + * + * RETURNS: 0 on success, -1 on error with errno set. + * + * NOTE: the caller assumes that errno is set to + * a nonzero value if this routine returns + * an error (nonzero return value). + * + * This routine prints RPC error messages to + * stderr. + */ +STATIC int +nfscall( + RpcUdpServer srvr, + int proc, + xdrproc_t xargs, + void * pargs, + xdrproc_t xres, + void * pres) +{ +RpcUdpXact xact; +enum clnt_stat stat; +RpcUdpXactPool pool; +int rval = -1; + + + switch (proc) { + case NFSPROC_SYMLINK: + case NFSPROC_WRITE: + pool = bigPool; break; + default: pool = smallPool; break; + } + + xact = rpcUdpXactPoolGet(pool, XactGetCreate); + + if ( !xact ) { + errno = ENOMEM; + return -1; + } + + if ( RPC_SUCCESS != (stat=rpcUdpSend( + xact, + srvr, + NFSCALL_TIMEOUT, + proc, + xres, + pres, + xargs, + pargs, + 0)) || + RPC_SUCCESS != (stat=rpcUdpRcv(xact)) ) { + + fprintf(stderr, + "NFS (proc %i) - %s\n", + proc, + clnt_sperrno(stat)); + + switch (stat) { + /* TODO: this is probably not complete and/or fully accurate */ + case RPC_CANTENCODEARGS : errno = EINVAL; break; + case RPC_AUTHERROR : errno = EPERM; break; + + case RPC_CANTSEND : + case RPC_CANTRECV : /* hope they have errno set */ + case RPC_SYSTEMERROR : break; + + default : errno = EIO; break; + } + } else { + rval = 0; + } + + /* release the transaction back into the pool */ + rpcUdpXactPoolPut(xact); + + if (rval && !errno) + errno = EIO; + + return rval; +} + +/* Check the 'age' of a node's stats + * and read the attributes from the server + * if necessary. + * + * ARGS: node node to update + * force enforce updating ignoring + * the timestamp/age + * + * RETURNS: 0 on success, + * -1 on failure with errno set + */ + +static int +updateAttr(NfsNode node, int force) +{ + + if (force +#ifdef CONFIG_ATTR_LIFETIME + || (nowSeconds() - node->age > CONFIG_ATTR_LIFETIME) +#endif + ) { + if ( nfscall(node->nfs->server, + NFSPROC_GETATTR, + (xdrproc_t)xdr_nfs_fh, &SERP_FILE(node), + (xdrproc_t)xdr_attrstat, &node->serporid) ) + return -1; + + if ( NFS_OK != node->serporid.status ) { + errno = node->serporid.status; + return -1; + } + + node->age = nowSeconds(); + } + + return 0; +} + +/* + * IP address helper. + * + * initialize a sockaddr_in from a + * [<uid>'.'<gid>'@']<host>':'<path>" string and let + * pPath point to the <path> part; retrieve the optional + * uid/gids + * + * ARGS: see description above + * + * RETURNS: 0 on success, + * -1 on failure with errno set + */ +static int +buildIpAddr(u_long *puid, u_long *pgid, + char **pHost, struct sockaddr_in *psa, + char **pPath) +{ +struct hostent *h; +char host[64]; +char *chpt = *pPath; +char *path; +int len; + + if ( !chpt ) { + errno = EINVAL; + return -1; + } + + /* look for the optional uid/gid */ + if ( (chpt = strchr(chpt, UIDSEP)) ) { + if ( 2 != sscanf(*pPath,"%li.%li",puid,pgid) ) { + errno = EINVAL; + return -1; + } + chpt++; + } else { + *puid = geteuid(); + *pgid = getegid(); + chpt = *pPath; + } + if ( pHost ) + *pHost = chpt; + + /* split the device name which is in the form + * + * <host> ':' <path> + * + * into its components using a local buffer + */ + + if ( !(path = strchr(chpt, HOSTDELIM)) || + (len = path - chpt) >= sizeof(host) - 1 ) { + errno = EINVAL; + return -1; + } + /* point to path beyond ':' */ + path++; + + strncpy(host, chpt, len); + host[len]=0; + + /* BEGIN OF NON-THREAD SAFE REGION */ + + h = gethostbyname(host); + + if ( !h ) { + errno = EINVAL; + return -1; + } + + memcpy(&psa->sin_addr, h->h_addr, sizeof (struct in_addr)); + + /* END OF NON-THREAD SAFE REGION */ + + psa->sin_family = AF_INET; + psa->sin_port = 0; + *pPath = path; + return 0; +} + +/* wrapper similar to nfscall. + * However, since it is not used + * very often, the simpler and less + * efficient rpcUdpCallRp API is used. + * + * ARGS: see 'nfscall()' above + * + * RETURNS: RPC status + */ +static enum clnt_stat +mntcall( + struct sockaddr_in *psrvr, + int proc, + xdrproc_t xargs, + void * pargs, + xdrproc_t xres, + void * pres, + u_long uid, + u_long gid) +{ +#ifdef MOUNT_V1_PORT +int retry; +#endif +enum clnt_stat stat = RPC_FAILED; + +#ifdef MOUNT_V1_PORT + /* if the portmapper fails, retry a fixed port */ + for (retry = 1, psrvr->sin_port = 0, stat = RPC_FAILED; + retry >= 0 && stat; + stat && (psrvr->sin_port = htons(MOUNT_V1_PORT)), retry-- ) +#endif + stat = rpcUdpCallRp( + psrvr, + MOUNTPROG, + MOUNTVERS, + proc, + xargs, + pargs, + xres, + pres, + uid, + gid, + MNTCALL_TIMEOUT + ); + return stat; +} + +/***************************************** + RTEMS File System Operations for NFS + *****************************************/ + +static bool nfs_is_directory( + rtems_filesystem_eval_path_context_t *ctx, + void *arg +) +{ + bool is_dir = false; + rtems_filesystem_location_info_t *currentloc = + rtems_filesystem_eval_path_get_currentloc(ctx); + NfsNode node = currentloc->node_access; + int force_update = 0; + + if (updateAttr(node, force_update) == 0) { + is_dir = SERP_ATTR(node).type == NFDIR; + } + + return is_dir; +} + +static int nfs_search_in_directory( + Nfs nfs, + const NfsNode dir, + char *part, + NfsNode entry +) +{ + int rv; + + entry->nfs = nfs; + + /* lookup one element */ + SERP_ATTR(entry) = SERP_ATTR(dir); + SERP_FILE(entry) = SERP_FILE(dir); + SERP_ARGS(entry).diroparg.name = part; + + /* remember args / directory fh */ + memcpy(&entry->args, &SERP_FILE(dir), sizeof(dir->args)); + +#if DEBUG & DEBUG_EVALPATH + fprintf(stderr,"Looking up '%s'\n",part); +#endif + + rv = nfscall( + nfs->server, + NFSPROC_LOOKUP, + (xdrproc_t) xdr_diropargs, &SERP_FILE(entry), + (xdrproc_t) xdr_serporid, &entry->serporid + ); + + if (rv == 0 && entry->serporid.status == NFS_OK) { + int force_update = 1; + + rv = updateAttr(entry, force_update); + } else { + rv = -1; + } + + return rv; +} + +static void nfs_eval_follow_link( + rtems_filesystem_eval_path_context_t *ctx, + NfsNode link +) +{ + const size_t len = NFS_MAXPATHLEN + 1; + char *buf = malloc(len); + + if (buf != NULL) { + ssize_t rv = nfs_readlink_with_node(link, buf, len); + + if (rv >= 0) { + rtems_filesystem_eval_path_recursive(ctx, buf, (size_t) rv); + } else { + rtems_filesystem_eval_path_error(ctx, 0); + } + + free(buf); + } else { + rtems_filesystem_eval_path_error(ctx, ENOMEM); + } +} + +static void nfs_eval_set_handlers( + rtems_filesystem_eval_path_context_t *ctx, + ftype type +) +{ + rtems_filesystem_location_info_t *currentloc = + rtems_filesystem_eval_path_get_currentloc(ctx); + + switch (type) { + case NFDIR: + currentloc->handlers = &nfs_dir_file_handlers; + break; + case NFREG: + currentloc->handlers = &nfs_file_file_handlers; + break; + case NFLNK: + currentloc->handlers = &nfs_link_file_handlers; + break; + default: + currentloc->handlers = &rtems_filesystem_handlers_default; + break; + } +} + +static int nfs_move_node(NfsNode dst, const NfsNode src) +{ + int rv = 0; + + if (dst->str != NULL) { +#if DEBUG & DEBUG_COUNT_NODES + rtems_interrupt_level flags; + rtems_interrupt_disable(flags); + dst->nfs->stringsInUse--; + rtems_interrupt_enable(flags); +#endif + free(dst->str); + } + + *dst = *src; + dst->str = NULL; + + if (src->args.name != NULL) { + dst->str = dst->args.name = strdup(src->args.name); + if (dst->str != NULL) { +#if DEBUG & DEBUG_COUNT_NODES + rtems_interrupt_level flags; + rtems_interrupt_disable(flags); + dst->nfs->stringsInUse++; + rtems_interrupt_enable(flags); +#endif + } else { + rv = -1; + } + } + + return rv; +} + +static rtems_filesystem_eval_path_generic_status nfs_eval_part( + rtems_filesystem_eval_path_context_t *ctx, + char *part +) +{ + rtems_filesystem_eval_path_generic_status status = + RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE; + rtems_filesystem_location_info_t *currentloc = + rtems_filesystem_eval_path_get_currentloc(ctx); + Nfs nfs = currentloc->mt_entry->fs_info; + NfsNode dir = currentloc->node_access; + NfsNodeRec entry; + int rv = nfs_search_in_directory(nfs, dir, part, &entry); + + if (rv == 0) { + bool terminal = !rtems_filesystem_eval_path_has_path(ctx); + int eval_flags = rtems_filesystem_eval_path_get_flags(ctx); + bool follow_sym_link = (eval_flags & RTEMS_FS_FOLLOW_SYM_LINK) != 0; + ftype type = SERP_ATTR(&entry).type; + + rtems_filesystem_eval_path_clear_token(ctx); + + if (type == NFLNK && (follow_sym_link || !terminal)) { + nfs_eval_follow_link(ctx, &entry); + } else { + rv = nfs_move_node(dir, &entry); + if (rv == 0) { + nfs_eval_set_handlers(ctx, type); + if (!terminal) { + status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE; + } + } else { + rtems_filesystem_eval_path_error(ctx, ENOMEM); + } + } + } else { + status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY; + } + + return status; +} + +static rtems_filesystem_eval_path_generic_status nfs_eval_token( + rtems_filesystem_eval_path_context_t *ctx, + void *arg, + const char *token, + size_t tokenlen +) +{ + rtems_filesystem_eval_path_generic_status status = + RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE; + + if (rtems_filesystem_is_current_directory(token, tokenlen)) { + rtems_filesystem_eval_path_clear_token(ctx); + if (rtems_filesystem_eval_path_has_path(ctx)) { + status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE; + } + } else { + char *part = nfs_dupname(token, tokenlen); + + if (part != NULL) { + status = nfs_eval_part(ctx, part); + free(part); + } else { + rtems_filesystem_eval_path_error(ctx, ENOMEM); + } + } + + return status; +} + +static const rtems_filesystem_eval_path_generic_config nfs_eval_config = { + .is_directory = nfs_is_directory, + .eval_token = nfs_eval_token +}; + +static void nfs_eval_path(rtems_filesystem_eval_path_context_t *ctx) +{ + rtems_filesystem_eval_path_generic(ctx, NULL, &nfs_eval_config); +} + +/* create a hard link */ + +static int nfs_link( + const rtems_filesystem_location_info_t *parentloc, + const rtems_filesystem_location_info_t *targetloc, + const char *name, + size_t namelen +) +{ +int rv = 0; +NfsNode pNode = parentloc->node_access; +nfsstat status; +NfsNode tNode = targetloc->node_access; +char *dupname; + + dupname = nfs_dupname(name, namelen); + if (dupname == NULL) + return -1; + +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr,"Creating link '%s'\n",dupname); +#endif + + memcpy(&SERP_ARGS(tNode).linkarg.to.dir, + &SERP_FILE(pNode), + sizeof(SERP_FILE(pNode))); + + SERP_ARGS(tNode).linkarg.to.name = dupname; + + if ( nfscall(tNode->nfs->server, + NFSPROC_LINK, + (xdrproc_t)xdr_linkargs, &SERP_FILE(tNode), + (xdrproc_t)xdr_nfsstat, &status) + || (NFS_OK != (errno = status)) + ) { +#if DEBUG & DEBUG_SYSCALLS + perror("nfs_link"); +#endif + rv = -1; + } + + free(dupname); + + return rv; + +} + +static int nfs_do_unlink( + const rtems_filesystem_location_info_t *parentloc, + const rtems_filesystem_location_info_t *loc, + int proc +) +{ +nfsstat status; +NfsNode node = loc->node_access; +Nfs nfs = node->nfs; +#if DEBUG & DEBUG_SYSCALLS +char *name = NFSPROC_REMOVE == proc ? + "nfs_unlink" : "nfs_rmdir"; +#endif + + /* The FS generics have determined that pathloc is _not_ + * a directory. Hence we may assume that the parent + * is in our NFS. + */ + +#if DEBUG & DEBUG_SYSCALLS + assert( node->args.name == node->str && node->str ); + + fprintf(stderr,"%s '%s'\n", name, node->args.name); +#endif + + if ( nfscall(nfs->server, + proc, + (xdrproc_t)xdr_diropargs, &node->args, + (xdrproc_t)xdr_nfsstat, &status) + || (NFS_OK != (errno = status)) + ) { +#if DEBUG & DEBUG_SYSCALLS + perror(name); +#endif + return -1; + } + + return 0; +} + +static int nfs_chown( + const rtems_filesystem_location_info_t *pathloc, /* IN */ + uid_t owner, /* IN */ + gid_t group /* IN */ +) +{ +sattr arg; + + arg.uid = owner; + arg.gid = group; + + return nfs_sattr(pathloc->node_access, &arg, SATTR_UID | SATTR_GID); + +} + +static int nfs_clonenode(rtems_filesystem_location_info_t *loc) +{ + NfsNode node = loc->node_access; + + LOCK(nfsGlob.lock); + node = nfsNodeClone(node); + UNLOCK(nfsGlob.lock); + + loc->node_access = node; + + return node != NULL ? 0 : -1; +} + +/* Cleanup the FS private info attached to pathloc->node_access */ +static void nfs_freenode( + const rtems_filesystem_location_info_t *pathloc /* IN */ +) +{ +#if DEBUG & DEBUG_COUNT_NODES +Nfs nfs = ((NfsNode)pathloc->node_access)->nfs; + + /* print counts at entry where they are > 0 so 'nfs' is safe from being destroyed + * and there's no race condition + */ + fprintf(stderr, + "entering freenode, in use count is %i nodes, %i strings\n", + nfs->nodesInUse, + nfs->stringsInUse); +#endif + + nfsNodeDestroy(pathloc->node_access); +} + +/* NOTE/TODO: mounting on top of NFS is not currently supported + * + * Challenge: stateless protocol. It would be possible to + * delete mount points on the server. We would need some sort + * of a 'garbage collector' looking for dead/unreachable + * mount points and unmounting them. + * Also, the path evaluation routine would have to check + * for crossing mount points. Crossing over from one NFS + * into another NFS could probably handled iteratively + * rather than by recursion. + */ + +int rtems_nfs_initialize( + rtems_filesystem_mount_table_entry_t *mt_entry, + const void *data +) +{ +char *host; +struct sockaddr_in saddr; +enum clnt_stat stat; +fhstatus fhstat; +u_long uid,gid; +#ifdef NFS_V2_PORT +int retry; +#endif +Nfs nfs = 0; +NfsNode rootNode = 0; +RpcUdpServer nfsServer = 0; +int e = -1; +char *path = mt_entry->dev; + + if (rpcUdpInit () < 0) { + fprintf (stderr, "error: initialising RPC\n"); + return -1; + } + + nfsInit(0, 0); + +#if 0 + printf("Trying to mount %s on %s\n",path,mntpoint); +#endif + + if ( buildIpAddr(&uid, &gid, &host, &saddr, &path) ) + return -1; + +#ifdef NFS_V2_PORT + /* if the portmapper fails, retry a fixed port */ + for (retry = 1, saddr.sin_port = 0, stat = RPC_FAILED; + retry >= 0 && stat; + stat && (saddr.sin_port = htons(NFS_V2_PORT)), retry-- ) +#endif + stat = rpcUdpServerCreate( + &saddr, + NFS_PROGRAM, + NFS_VERSION_2, + uid, + gid, + &nfsServer + ); + + if ( RPC_SUCCESS != stat ) { + fprintf(stderr, + "Unable to contact NFS server - invalid port? (%s)\n", + clnt_sperrno(stat)); + e = EPROTONOSUPPORT; + goto cleanup; + } + + + /* first, try to ping the NFS server by + * calling the NULL proc. + */ + if ( nfscall(nfsServer, + NFSPROC_NULL, + (xdrproc_t)xdr_void, 0, + (xdrproc_t)xdr_void, 0) ) { + + fputs("NFS Ping ",stderr); + fwrite(host, 1, path-host-1, stderr); + fprintf(stderr," failed: %s\n", strerror(errno)); + + e = errno ? errno : EIO; + goto cleanup; + } + + /* that seemed to work - we now try the + * actual mount + */ + + /* reuse server address but let the mntcall() + * search for the mountd's port + */ + saddr.sin_port = 0; + + stat = mntcall( &saddr, + MOUNTPROC_MNT, + (xdrproc_t)xdr_dirpath, + &path, + (xdrproc_t)xdr_fhstatus, + &fhstat, + uid, + gid ); + + if (stat) { + fprintf(stderr,"MOUNT -- %s\n",clnt_sperrno(stat)); + if ( e<=0 ) + e = EIO; + goto cleanup; + } else if (NFS_OK != (e=fhstat.fhs_status)) { + fprintf(stderr,"MOUNT: %s\n",strerror(e)); + goto cleanup; + } + + nfs = nfsCreate(nfsServer); + assert( nfs ); + nfsServer = 0; + + nfs->uid = uid; + nfs->gid = gid; + + /* that seemed to work - we now create the root node + * and we also must obtain the root node attributes + */ + rootNode = nfsNodeCreate(nfs, &fhstat.fhstatus_u.fhs_fhandle); + assert( rootNode ); + + if ( updateAttr(rootNode, 1 /* force */) ) { + e = errno; + goto cleanup; + } + + /* looks good so far */ + + mt_entry->mt_fs_root->location.node_access = rootNode; + + rootNode = 0; + + mt_entry->ops = &nfs_fs_ops; + mt_entry->mt_fs_root->location.handlers = &nfs_dir_file_handlers; + mt_entry->pathconf_limits_and_options = &nfs_limits_and_options; + + LOCK(nfsGlob.llock); + nfsGlob.num_mounted_fs++; + /* allocate a new ID for this FS */ + nfs->id = nfsGlob.fs_ids++; + UNLOCK(nfsGlob.llock); + + mt_entry->fs_info = nfs; + nfs->mt_entry = mt_entry; + nfs = 0; + + e = 0; + +cleanup: + if (nfs) + nfsDestroy(nfs); + if (nfsServer) + rpcUdpServerDestroy(nfsServer); + if (rootNode) + nfsNodeDestroy(rootNode); + if (e) + rtems_set_errno_and_return_minus_one(e); + else + return 0; +} + +/* This op is called when they try to unmount THIS fs */ +STATIC void nfs_fsunmount_me( + rtems_filesystem_mount_table_entry_t *mt_entry /* in */ +) +{ +enum clnt_stat stat; +struct sockaddr_in saddr; +char *path = mt_entry->dev; +int nodesInUse; +u_long uid,gid; +int status; + +LOCK(nfsGlob.llock); + nodesInUse = ((Nfs)mt_entry->fs_info)->nodesInUse; + + if (nodesInUse > 1 /* one ref to the root node used by us */) { + UNLOCK(nfsGlob.llock); + fprintf(stderr, + "Refuse to unmount; there are still %i nodes in use (1 used by us)\n", + nodesInUse); + rtems_fatal_error_occurred(0xdeadbeef); + return; + } + + status = buildIpAddr(&uid, &gid, 0, &saddr, &path); + assert( !status ); + + stat = mntcall( &saddr, + MOUNTPROC_UMNT, + (xdrproc_t)xdr_dirpath, &path, + (xdrproc_t)xdr_void, 0, + uid, + gid + ); + + if (stat) { + UNLOCK(nfsGlob.llock); + fprintf(stderr,"NFS UMOUNT -- %s\n", clnt_sperrno(stat)); + return; + } + + nfsNodeDestroy(mt_entry->mt_fs_root->location.node_access); + mt_entry->mt_fs_root->location.node_access = 0; + + nfsDestroy(mt_entry->fs_info); + mt_entry->fs_info = 0; + + nfsGlob.num_mounted_fs--; +UNLOCK(nfsGlob.llock); +} + +/* OPTIONAL; may be NULL - BUT: CAUTION; mount() doesn't check + * for this handler to be present - a fs bug + * //NOTE: (10/25/2002) patch submitted and probably applied + */ +static rtems_filesystem_node_types_t nfs_node_type( + const rtems_filesystem_location_info_t *loc +) +{ +NfsNode node = loc->node_access; + + if (updateAttr(node, 0 /* only if old */)) + return -1; + + switch( SERP_ATTR(node).type ) { + default: + /* rtems has no value for 'unknown'; + */ + case NFNON: + case NFSOCK: + case NFBAD: + case NFFIFO: + break; + + + case NFREG: return RTEMS_FILESYSTEM_MEMORY_FILE; + case NFDIR: return RTEMS_FILESYSTEM_DIRECTORY; + + case NFBLK: + case NFCHR: return RTEMS_FILESYSTEM_DEVICE; + + case NFLNK: return RTEMS_FILESYSTEM_SYM_LINK; + } + return -1; +} + +static int nfs_mknod( + const rtems_filesystem_location_info_t *parentloc, + const char *name, + size_t namelen, + mode_t mode, + dev_t dev +) +{ + +int rv = 0; +struct timeval now; +diropres res; +NfsNode node = parentloc->node_access; +Nfs nfs = node->nfs; +mode_t type = S_IFMT & mode; +char *dupname; + + if (type != S_IFDIR && type != S_IFREG) + rtems_set_errno_and_return_minus_one(ENOTSUP); + + dupname = nfs_dupname(name, namelen); + if (dupname == NULL) + return -1; + +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr,"nfs_mknod: creating %s\n", dupname); +#endif + + rtems_clock_get_tod_timeval(&now); + + SERP_ARGS(node).createarg.name = dupname; + SERP_ARGS(node).createarg.attributes.mode = mode; + SERP_ARGS(node).createarg.attributes.uid = nfs->uid; + SERP_ARGS(node).createarg.attributes.gid = nfs->gid; + SERP_ARGS(node).createarg.attributes.size = 0; + SERP_ARGS(node).createarg.attributes.atime.seconds = now.tv_sec; + SERP_ARGS(node).createarg.attributes.atime.useconds = now.tv_usec; + SERP_ARGS(node).createarg.attributes.mtime.seconds = now.tv_sec; + SERP_ARGS(node).createarg.attributes.mtime.useconds = now.tv_usec; + + if ( nfscall( nfs->server, + (type == S_IFDIR) ? NFSPROC_MKDIR : NFSPROC_CREATE, + (xdrproc_t)xdr_createargs, &SERP_FILE(node), + (xdrproc_t)xdr_diropres, &res) + || (NFS_OK != (errno = res.status)) ) { +#if DEBUG & DEBUG_SYSCALLS + perror("nfs_mknod"); +#endif + rv = -1; + } + + free(dupname); + + return rv; +} + +static int nfs_rmnod( + const rtems_filesystem_location_info_t *parentloc, + const rtems_filesystem_location_info_t *loc +) +{ + int rv = 0; + NfsNode node = loc->node_access; + int force_update = 0; + + if (updateAttr(node, force_update) == 0) { + int proc = SERP_ATTR(node).type == NFDIR + ? NFSPROC_RMDIR + : NFSPROC_REMOVE; + + rv = nfs_do_unlink(parentloc, loc, proc); + } else { + rv = -1; + } + + return rv; +} + +static int nfs_utime( + const rtems_filesystem_location_info_t *pathloc, /* IN */ + time_t actime, /* IN */ + time_t modtime /* IN */ +) +{ +sattr arg; + + /* TODO: add rtems EPOCH - UNIX EPOCH seconds */ + arg.atime.seconds = actime; + arg.atime.useconds = 0; + arg.mtime.seconds = modtime; + arg.mtime.useconds = 0; + + return nfs_sattr(pathloc->node_access, &arg, SATTR_ATIME | SATTR_MTIME); +} + +static int nfs_symlink( + const rtems_filesystem_location_info_t *parentloc, + const char *name, + size_t namelen, + const char *target +) +{ +int rv = 0; +struct timeval now; +nfsstat status; +NfsNode node = parentloc->node_access; +Nfs nfs = node->nfs; +char *dupname; + + dupname = nfs_dupname(name, namelen); + if (dupname == NULL) + return -1; + +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr,"nfs_symlink: creating %s -> %s\n", dupname, target); +#endif + + rtems_clock_get_tod_timeval(&now); + + SERP_ARGS(node).symlinkarg.name = dupname; + SERP_ARGS(node).symlinkarg.to = (nfspath) target; + + SERP_ARGS(node).symlinkarg.attributes.mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; + SERP_ARGS(node).symlinkarg.attributes.uid = nfs->uid; + SERP_ARGS(node).symlinkarg.attributes.gid = nfs->gid; + SERP_ARGS(node).symlinkarg.attributes.size = 0; + SERP_ARGS(node).symlinkarg.attributes.atime.seconds = now.tv_sec; + SERP_ARGS(node).symlinkarg.attributes.atime.useconds = now.tv_usec; + SERP_ARGS(node).symlinkarg.attributes.mtime.seconds = now.tv_sec; + SERP_ARGS(node).symlinkarg.attributes.mtime.useconds = now.tv_usec; + + if ( nfscall( nfs->server, + NFSPROC_SYMLINK, + (xdrproc_t)xdr_symlinkargs, &SERP_FILE(node), + (xdrproc_t)xdr_nfsstat, &status) + || (NFS_OK != (errno = status)) ) { +#if DEBUG & DEBUG_SYSCALLS + perror("nfs_symlink"); +#endif + rv = -1; + } + + free(dupname); + + return rv; +} + +static ssize_t nfs_readlink_with_node( + NfsNode node, + char *buf, + size_t len +) +{ + Nfs nfs = node->nfs; + readlinkres_strbuf rr; + + rr.strbuf.buf = buf; + rr.strbuf.max = len - 1; + + if ( nfscall(nfs->server, + NFSPROC_READLINK, + (xdrproc_t)xdr_nfs_fh, &SERP_FILE(node), + (xdrproc_t)xdr_readlinkres_strbuf, &rr) + || (NFS_OK != (errno = rr.status)) ) { +#if DEBUG & DEBUG_SYSCALLS + perror("nfs_readlink_with_node"); +#endif + return -1; + } + + return (ssize_t) strlen(rr.strbuf.buf); +} + +static ssize_t nfs_readlink( + const rtems_filesystem_location_info_t *loc, + char *buf, + size_t len +) +{ + NfsNode node = loc->node_access; + + return nfs_readlink_with_node(node, buf, len); +} + +static int nfs_rename( + const rtems_filesystem_location_info_t *oldparentloc, + const rtems_filesystem_location_info_t *oldloc, + const rtems_filesystem_location_info_t *newparentloc, + const char *name, + size_t namelen +) +{ + int rv = 0; + char *dupname = nfs_dupname(name, namelen); + + if (dupname != NULL) { + NfsNode oldParentNode = oldparentloc->node_access; + NfsNode oldNode = oldloc->node_access; + NfsNode newParentNode = newparentloc->node_access; + Nfs nfs = oldParentNode->nfs; + const nfs_fh *toDirSrc = &SERP_FILE(newParentNode); + nfs_fh *toDirDst = &SERP_ARGS(oldParentNode).renamearg.to.dir; + nfsstat status; + + SERP_ARGS(oldParentNode).renamearg.name = oldNode->str; + SERP_ARGS(oldParentNode).renamearg.to.name = dupname; + memcpy(toDirDst, toDirSrc, sizeof(*toDirDst)); + + rv = nfscall( + nfs->server, + NFSPROC_RENAME, + (xdrproc_t) xdr_renameargs, + &SERP_FILE(oldParentNode), + (xdrproc_t) xdr_nfsstat, + &status + ); + if (rv == 0 && (errno = status) != NFS_OK) { + rv = -1; + } + + free(dupname); + } else { + rv = -1; + } + + return rv; +} + +static void nfs_lock(const rtems_filesystem_mount_table_entry_t *mt_entry) +{ +} + +static void nfs_unlock(const rtems_filesystem_mount_table_entry_t *mt_entry) +{ +} + +static bool nfs_are_nodes_equal( + const rtems_filesystem_location_info_t *a, + const rtems_filesystem_location_info_t *b +) +{ + bool equal = false; + NfsNode na = a->node_access; + + if (updateAttr(na, 0) == 0) { + NfsNode nb = b->node_access; + + if (updateAttr(nb, 0) == 0) { + equal = SERP_ATTR(na).fileid == SERP_ATTR(nb).fileid + && SERP_ATTR(na).fsid == SERP_ATTR(nb).fsid; + } + } + + return equal; +} + +static int nfs_fchmod( + const rtems_filesystem_location_info_t *loc, + mode_t mode +) +{ +sattr arg; + + arg.mode = mode; + return nfs_sattr(loc->node_access, &arg, SATTR_MODE); + +} + +const struct _rtems_filesystem_operations_table nfs_fs_ops = { + .lock_h = nfs_lock, + .unlock_h = nfs_unlock, + .eval_path_h = nfs_eval_path, + .link_h = nfs_link, + .are_nodes_equal_h = nfs_are_nodes_equal, + .node_type_h = nfs_node_type, + .mknod_h = nfs_mknod, + .rmnod_h = nfs_rmnod, + .fchmod_h = nfs_fchmod, + .chown_h = nfs_chown, + .clonenod_h = nfs_clonenode, + .freenod_h = nfs_freenode, + .mount_h = rtems_filesystem_default_mount, + .fsmount_me_h = rtems_nfs_initialize, + .unmount_h = rtems_filesystem_default_unmount, + .fsunmount_me_h = nfs_fsunmount_me, + .utime_h = nfs_utime, + .symlink_h = nfs_symlink, + .readlink_h = nfs_readlink, + .rename_h = nfs_rename, + .statvfs_h = rtems_filesystem_default_statvfs +}; + +/***************************************** + File Handlers + + NOTE: the FS generics expect a FS' + evalpath_h() to switch the + pathloc->handlers according + to the pathloc/node's file + type. + We currently have 'file' and + 'directory' handlers and very + few 'symlink' handlers. + + The handlers for each type are + implemented or #defined ZERO + in a 'nfs_file_xxx', + 'nfs_dir_xxx', 'nfs_link_xxx' + sequence below this point. + + In some cases, a common handler, + can be used for all file types. + It is then simply called + 'nfs_xxx'. + *****************************************/ + +/* stateless NFS protocol makes this trivial */ +static int nfs_file_open( + rtems_libio_t *iop, + const char *pathname, + int oflag, + mode_t mode +) +{ + return 0; +} + +/* reading directories is not stateless; we must + * remember the last 'read' position, i.e. + * the server 'cookie'. We do manage this information + * attached to the pathinfo.node_access_2. + */ +static int nfs_dir_open( + rtems_libio_t *iop, + const char *pathname, + int oflag, + mode_t mode +) +{ +NfsNode node = iop->pathinfo.node_access; +DirInfo di; + + /* create a readdirargs object and copy the file handle; + * attach to the pathinfo.node_access_2 + */ + + di = (DirInfo) malloc(sizeof(*di)); + iop->pathinfo.node_access_2 = di; + + if ( !di ) { + errno = ENOMEM; + return -1; + } + + memcpy( &di->readdirargs.dir, + &SERP_FILE(node), + sizeof(di->readdirargs.dir) ); + + /* rewind cookie */ + memset( &di->readdirargs.cookie, + 0, + sizeof(di->readdirargs.cookie) ); + + di->eofreached = FALSE; + + return 0; +} + +static int nfs_file_close( + rtems_libio_t *iop +) +{ + return 0; +} + +static int nfs_dir_close( + rtems_libio_t *iop +) +{ + free(iop->pathinfo.node_access_2); + iop->pathinfo.node_access_2 = 0; + return 0; +} + +static ssize_t nfs_file_read_chunk( + NfsNode node, + uint32_t offset, + void *buffer, + size_t count +) +{ +readres rr; +Nfs nfs = node->nfs; + + SERP_ARGS(node).readarg.offset = offset; + SERP_ARGS(node).readarg.count = count; + SERP_ARGS(node).readarg.totalcount = UINT32_C(0xdeadbeef); + + rr.readres_u.reply.data.data_val = buffer; + + if ( nfscall( nfs->server, + NFSPROC_READ, + (xdrproc_t)xdr_readargs, &SERP_FILE(node), + (xdrproc_t)xdr_readres, &rr) ) { + return -1; + } + + + if (NFS_OK != rr.status) { + rtems_set_errno_and_return_minus_one(rr.status); + } + +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr, + "Read %i (asked for %i) bytes from offset %i to 0x%08x\n", + rr.readres_u.reply.data.data_len, + count, + iop->offset, + rr.readres_u.reply.data.data_val); +#endif + + + return rr.readres_u.reply.data.data_len; +} + +static ssize_t nfs_file_read( + rtems_libio_t *iop, + void *buffer, + size_t count +) +{ + ssize_t rv = 0; + NfsNode node = iop->pathinfo.node_access; + uint32_t offset = iop->offset; + char *in = buffer; + + do { + size_t chunk = count <= NFS_MAXDATA ? count : NFS_MAXDATA; + ssize_t done = nfs_file_read_chunk(node, offset, in, chunk); + + if (done > 0) { + offset += (uint32_t) done; + in += done; + count -= (size_t) done; + rv += done; + } else { + count = 0; + if (done < 0) { + rv = -1; + } + } + } while (count > 0); + + if (rv > 0) { + iop->offset = offset; + } + + return rv; +} + +/* this is called by readdir() / getdents() */ +static ssize_t nfs_dir_read( + rtems_libio_t *iop, + void *buffer, + size_t count +) +{ +DirInfo di = iop->pathinfo.node_access_2; +RpcUdpServer server = ((Nfs)iop->pathinfo.mt_entry->fs_info)->server; + + if ( di->eofreached ) + return 0; + + di->ptr = di->buf = buffer; + + /* align + round down the buffer */ + count &= ~ (DIRENT_HEADER_SIZE - 1); + di->len = count; + +#if 0 + /* now estimate the number of entries we should ask for */ + count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN; + + /* estimate the encoded size that might take up */ + count *= dirres_entry_size + CONFIG_AVG_NAMLEN; +#else + /* integer arithmetics are better done the other way round */ + count *= dirres_entry_size + CONFIG_AVG_NAMLEN; + count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN; +#endif + + if (count > NFS_MAXDATA) + count = NFS_MAXDATA; + + di->readdirargs.count = count; + +#if DEBUG & DEBUG_READDIR + fprintf(stderr, + "Readdir: asking for %i XDR bytes, buffer is %i\n", + count, di->len); +#endif + + if ( nfscall( + server, + NFSPROC_READDIR, + (xdrproc_t)xdr_readdirargs, &di->readdirargs, + (xdrproc_t)xdr_dir_info, di) ) { + return -1; + } + + + if (NFS_OK != di->status) { + rtems_set_errno_and_return_minus_one(di->status); + } + + return (char*)di->ptr - (char*)buffer; +} + +static ssize_t nfs_file_write( + rtems_libio_t *iop, + const void *buffer, + size_t count +) +{ +NfsNode node = iop->pathinfo.node_access; +Nfs nfs = node->nfs; +int e; + + if (count > NFS_MAXDATA) + count = NFS_MAXDATA; + + + SERP_ARGS(node).writearg.beginoffset = UINT32_C(0xdeadbeef); + if ( LIBIO_FLAGS_APPEND & iop->flags ) { + if ( updateAttr(node, 0) ) { + return -1; + } + SERP_ARGS(node).writearg.offset = SERP_ATTR(node).size; + } else { + SERP_ARGS(node).writearg.offset = iop->offset; + } + SERP_ARGS(node).writearg.totalcount = UINT32_C(0xdeadbeef); + SERP_ARGS(node).writearg.data.data_len = count; + SERP_ARGS(node).writearg.data.data_val = (void*)buffer; + + /* write XDR buffer size will be chosen by nfscall based + * on the PROC specifier + */ + + if ( nfscall( nfs->server, + NFSPROC_WRITE, + (xdrproc_t)xdr_writeargs, &SERP_FILE(node), + (xdrproc_t)xdr_attrstat, &node->serporid) ) { + return -1; + } + + + if (NFS_OK != (e=node->serporid.status) ) { + /* try at least to recover the current attributes */ + updateAttr(node, 1 /* force */); + rtems_set_errno_and_return_minus_one(e); + } + + node->age = nowSeconds(); + + iop->offset += count; + + return count; +} + +static off_t nfs_dir_lseek( + rtems_libio_t *iop, + off_t length, + int whence +) +{ + off_t rv = rtems_filesystem_default_lseek_directory(iop, length, whence); + + if (rv == 0) { + DirInfo di = iop->pathinfo.node_access_2; + nfscookie *cookie = &di->readdirargs.cookie; + + di->eofreached = FALSE; + + /* rewind cookie */ + memset(cookie, 0, sizeof(*cookie)); + } + + return rv; +} + +#if 0 /* structure types for reference */ +struct fattr { + ftype type; + u_int mode; + u_int nlink; + u_int uid; + u_int gid; + u_int size; + u_int blocksize; + u_int rdev; + u_int blocks; + u_int fsid; + u_int fileid; + nfstime atime; + nfstime mtime; + nfstime ctime; +}; + +struct stat +{ + dev_t st_dev; + ino_t st_ino; + mode_t st_mode; + nlink_t st_nlink; + uid_t st_uid; + gid_t st_gid; + dev_t st_rdev; + off_t st_size; + /* SysV/sco doesn't have the rest... But Solaris, eabi does. */ +#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__) + time_t st_atime; + time_t st_mtime; + time_t st_ctime; +#else + time_t st_atime; + long st_spare1; + time_t st_mtime; + long st_spare2; + time_t st_ctime; + long st_spare3; + long st_blksize; + long st_blocks; + long st_spare4[2]; +#endif +}; +#endif + +/* common for file/dir/link */ +static int nfs_fstat( + const rtems_filesystem_location_info_t *loc, + struct stat *buf +) +{ +NfsNode node = loc->node_access; +fattr *fa = &SERP_ATTR(node); + + if (updateAttr(node, 0 /* only if old */)) { + return -1; + } + +/* done by caller + memset(buf, 0, sizeof(*buf)); + */ + + /* translate */ + + /* one of the branches hopefully is optimized away */ + if (sizeof(ino_t) < sizeof(u_int)) { + buf->st_dev = NFS_MAKE_DEV_T_INO_HACK((NfsNode)loc->node_access); + } else { + buf->st_dev = NFS_MAKE_DEV_T((NfsNode)loc->node_access); + } + buf->st_mode = fa->mode; + buf->st_nlink = fa->nlink; + buf->st_uid = fa->uid; + buf->st_gid = fa->gid; + buf->st_size = fa->size; + /* Set to "preferred size" of this NFS client implementation */ + buf->st_blksize = nfsStBlksize ? nfsStBlksize : fa->blocksize; + buf->st_rdev = fa->rdev; + buf->st_blocks = fa->blocks; + buf->st_ino = fa->fileid; + buf->st_atime = fa->atime.seconds; + buf->st_mtime = fa->mtime.seconds; + buf->st_ctime = fa->ctime.seconds; + +#if 0 /* NFS should return the modes */ + switch(fa->type) { + default: + case NFNON: + case NFBAD: + break; + + case NFSOCK: buf->st_mode |= S_IFSOCK; break; + case NFFIFO: buf->st_mode |= S_IFIFO; break; + case NFREG : buf->st_mode |= S_IFREG; break; + case NFDIR : buf->st_mode |= S_IFDIR; break; + case NFBLK : buf->st_mode |= S_IFBLK; break; + case NFCHR : buf->st_mode |= S_IFCHR; break; + case NFLNK : buf->st_mode |= S_IFLNK; break; + } +#endif + + return 0; +} + +/* a helper which does the real work for + * a couple of handlers (such as chmod, + * ftruncate or utime) + */ +static int +nfs_sattr(NfsNode node, sattr *arg, u_long mask) +{ + +struct timeval now; +nfstime nfsnow, t; +int e; +u_int mode; + + if (updateAttr(node, 0 /* only if old */)) + return -1; + + rtems_clock_get_tod_timeval(&now); + + /* TODO: add rtems EPOCH - UNIX EPOCH seconds */ + nfsnow.seconds = now.tv_sec; + nfsnow.useconds = now.tv_usec; + + /* merge permission bits into existing type bits */ + mode = SERP_ATTR(node).mode; + if (mask & SATTR_MODE) { + mode &= S_IFMT; + mode |= arg->mode & ~S_IFMT; + } else { + mode = -1; + } + SERP_ARGS(node).sattrarg.attributes.mode = mode; + + SERP_ARGS(node).sattrarg.attributes.uid = + (mask & SATTR_UID) ? arg->uid : -1; + + SERP_ARGS(node).sattrarg.attributes.gid = + (mask & SATTR_GID) ? arg->gid : -1; + + SERP_ARGS(node).sattrarg.attributes.size = + (mask & SATTR_SIZE) ? arg->size : -1; + + if (mask & SATTR_ATIME) + t = arg->atime; + else if (mask & SATTR_TOUCHA) + t = nfsnow; + else + t.seconds = t.useconds = -1; + SERP_ARGS(node).sattrarg.attributes.atime = t; + + if (mask & SATTR_ATIME) + t = arg->mtime; + else if (mask & SATTR_TOUCHA) + t = nfsnow; + else + t.seconds = t.useconds = -1; + SERP_ARGS(node).sattrarg.attributes.mtime = t; + + node->serporid.status = NFS_OK; + + if ( nfscall( node->nfs->server, + NFSPROC_SETATTR, + (xdrproc_t)xdr_sattrargs, &SERP_FILE(node), + (xdrproc_t)xdr_attrstat, &node->serporid) ) { +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr, + "nfs_sattr (mask 0x%08x): %s", + mask, + strerror(errno)); +#endif + return -1; + } + + if (NFS_OK != (e=node->serporid.status) ) { +#if DEBUG & DEBUG_SYSCALLS + fprintf(stderr,"nfs_sattr: %s\n",strerror(e)); +#endif + /* try at least to recover the current attributes */ + updateAttr(node, 1 /* force */); + rtems_set_errno_and_return_minus_one(e); + } + + node->age = nowSeconds(); + + return 0; +} + +/* just set the size attribute to 'length' + * the server will take care of the rest :-) + */ +static int nfs_file_ftruncate( + rtems_libio_t *iop, + off_t length +) +{ +sattr arg; + + arg.size = length; + /* must not modify any other attribute; if we are not the owner + * of the file or directory but only have write access changing + * any attribute besides 'size' will fail... + */ + return nfs_sattr(iop->pathinfo.node_access, + &arg, + SATTR_SIZE); +} + +/* the file handlers table */ +static const +struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers = { + .open_h = nfs_file_open, + .close_h = nfs_file_close, + .read_h = nfs_file_read, + .write_h = nfs_file_write, + .ioctl_h = rtems_filesystem_default_ioctl, + .lseek_h = rtems_filesystem_default_lseek_file, + .fstat_h = nfs_fstat, + .ftruncate_h = nfs_file_ftruncate, + .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fcntl_h = rtems_filesystem_default_fcntl +}; + +/* the directory handlers table */ +static const +struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers = { + .open_h = nfs_dir_open, + .close_h = nfs_dir_close, + .read_h = nfs_dir_read, + .write_h = rtems_filesystem_default_write, + .ioctl_h = rtems_filesystem_default_ioctl, + .lseek_h = nfs_dir_lseek, + .fstat_h = nfs_fstat, + .ftruncate_h = rtems_filesystem_default_ftruncate_directory, + .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fcntl_h = rtems_filesystem_default_fcntl +}; + +/* the link handlers table */ +static const +struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers = { + .open_h = rtems_filesystem_default_open, + .close_h = rtems_filesystem_default_close, + .read_h = rtems_filesystem_default_read, + .write_h = rtems_filesystem_default_write, + .ioctl_h = rtems_filesystem_default_ioctl, + .lseek_h = rtems_filesystem_default_lseek, + .fstat_h = nfs_fstat, + .ftruncate_h = rtems_filesystem_default_ftruncate, + .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, + .fcntl_h = rtems_filesystem_default_fcntl +}; + +/* we need a dummy driver entry table to get a + * major number from the system + */ +static +rtems_device_driver nfs_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg +) +{ + /* we don't really use this routine because + * we cannot supply an argument (contrary + * to what the 'arg' parameter suggests - it + * is always set to 0 by the generics :-() + * and because we don't want the user to + * have to deal with the major number (which + * OTOH is something WE are interested in. The + * only reason for using this API was getting + * a major number, after all). + * + * Something must be present, however, to + * reserve a slot in the driver table. + */ + return RTEMS_SUCCESSFUL; +} + +static rtems_driver_address_table drvNfs = { + nfs_initialize, + 0, /* open */ + 0, /* close */ + 0, /* read */ + 0, /* write */ + 0 /* control */ +}; + +/* Dump a list of the currently mounted NFS to a file */ +int +nfsMountsShow(FILE *f) +{ +char *mntpt = 0; +Nfs nfs; + + if (!f) + f = stdout; + + if ( !(mntpt=malloc(MAXPATHLEN)) ) { + fprintf(stderr,"nfsMountsShow(): no memory\n"); + return -1; + } + + fprintf(f,"Currently Mounted NFS:\n"); + + LOCK(nfsGlob.llock); + + for (nfs = nfsGlob.mounted_fs; nfs; nfs=nfs->next) { + fprintf(f,"%s on ", nfs->mt_entry->dev); + if (rtems_filesystem_resolve_location(mntpt, MAXPATHLEN, &nfs->mt_entry->mt_fs_root->location)) + fprintf(f,"<UNABLE TO LOOKUP MOUNTPOINT>\n"); + else + fprintf(f,"%s\n",mntpt); + } + + UNLOCK(nfsGlob.llock); + + free(mntpt); + return 0; +} + +#if 0 +CCJ_REMOVE_MOUNT +/* convenience wrapper + * + * NOTE: this routine calls NON-REENTRANT + * gethostbyname() if the host is + * not in 'dot' notation. + */ +int +nfsMount(char *uidhost, char *path, char *mntpoint) +{ +struct stat st; +int devl; +char *host; +int rval = -1; +char *dev = 0; + + if (!uidhost || !path || !mntpoint) { + fprintf(stderr,"usage: nfsMount(""[uid.gid@]host"",""path"",""mountpoint"")\n"); + nfsMountsShow(stderr); + return -1; + } + + if ( !(dev = malloc((devl=strlen(uidhost) + 20 + strlen(path)+1))) ) { + fprintf(stderr,"nfsMount: out of memory\n"); + return -1; + } + + /* Try to create the mount point if nonexistent */ + if (stat(mntpoint, &st)) { + if (ENOENT != errno) { + perror("nfsMount trying to create mount point - stat failed"); + goto cleanup; + } else if (mkdir(mntpoint,0777)) { + perror("nfsMount trying to create mount point"); + goto cleanup; + } + } + + if ( !(host=strchr(uidhost,UIDSEP)) ) { + host = uidhost; + } else { + host++; + } + + if (isdigit((unsigned char)*host)) { + /* avoid using gethostbyname */ + sprintf(dev,"%s:%s",uidhost,path); + } else { + struct hostent *h; + + /* copy the uid part (hostname will be + * overwritten) + */ + strcpy(dev, uidhost); + + /* NOTE NOTE NOTE: gethostbyname is NOT + * thread safe. This is UGLY + */ + +/* BEGIN OF NON-THREAD SAFE REGION */ + + h = gethostbyname(host); + + if ( !h || + !inet_ntop( AF_INET, + (struct in_addr*)h->h_addr_list[0], + dev + (host - uidhost), + devl - (host - uidhost) ) + ) { + fprintf(stderr,"nfsMount: host '%s' not found\n",host); + goto cleanup; + } + +/* END OF NON-THREAD SAFE REGION */ + + /* append ':<path>' */ + strcat(dev,":"); + strcat(dev,path); + } + + printf("Trying to mount %s on %s\n",dev,mntpoint); + + if (mount(dev, + mntpoint, + "nfs", + RTEMS_FILESYSTEM_READ_WRITE, + NULL)) { + perror("nfsMount - mount"); + goto cleanup; + } + + rval = 0; + +cleanup: + free(dev); + return rval; +} +#endif + +/* HERE COMES A REALLY UGLY HACK */ + +/* This is stupid; it is _very_ hard to find the path + * leading to a rtems_filesystem_location_info_t node :-( + * The only easy way is making the location the current + * directory and issue a getcwd(). + * However, since we don't want to tamper with the + * current directory, we must create a separate + * task to do the job for us - sigh. + */ + +typedef struct ResolvePathArgRec_ { + rtems_filesystem_location_info_t *loc; /* IN: location to resolve */ + char *buf; /* IN/OUT: buffer where to put the path */ + int len; /* IN: buffer length */ + rtems_id sync; /* IN: synchronization */ + rtems_status_code status; /* OUT: result */ +} ResolvePathArgRec, *ResolvePathArg; + +static void +resolve_path(rtems_task_argument arg) +{ +ResolvePathArg rpa = (ResolvePathArg)arg; +rtems_filesystem_location_info_t old; + + /* IMPORTANT: let the helper task have its own libio environment (i.e. cwd) */ + if (RTEMS_SUCCESSFUL == (rpa->status = rtems_libio_set_private_env())) { + + old = rtems_filesystem_current->location; + + rtems_filesystem_current->location = *(rpa->loc); + + if ( !getcwd(rpa->buf, rpa->len) ) + rpa->status = RTEMS_UNSATISFIED; + + /* must restore the cwd because 'freenode' will be called on it */ + rtems_filesystem_current->location = old; + } + rtems_semaphore_release(rpa->sync); + rtems_task_delete(RTEMS_SELF); +} + + +/* a utility routine to find the path leading to a + * rtems_filesystem_location_info_t node + * + * INPUT: 'loc' and a buffer 'buf' (length 'len') to hold the + * path. + * OUTPUT: path copied into 'buf' + * + * RETURNS: 0 on success, RTEMS error code on error. + */ +rtems_status_code +rtems_filesystem_resolve_location(char *buf, int len, rtems_filesystem_location_info_t *loc) +{ +ResolvePathArgRec arg; +rtems_id tid = 0; +rtems_task_priority pri; +rtems_status_code status; + + arg.loc = loc; + arg.buf = buf; + arg.len = len; + arg.sync = 0; + + status = rtems_semaphore_create( + rtems_build_name('r','e','s','s'), + 0, + RTEMS_SIMPLE_BINARY_SEMAPHORE, + 0, + &arg.sync); + + if (RTEMS_SUCCESSFUL != status) + goto cleanup; + + rtems_task_set_priority(RTEMS_SELF, RTEMS_CURRENT_PRIORITY, &pri); + + status = rtems_task_create( + rtems_build_name('r','e','s','s'), + pri, + RTEMS_MINIMUM_STACK_SIZE + 50000, + RTEMS_DEFAULT_MODES, + RTEMS_DEFAULT_ATTRIBUTES, + &tid); + + if (RTEMS_SUCCESSFUL != status) + goto cleanup; + + status = rtems_task_start(tid, resolve_path, (rtems_task_argument)&arg); + + if (RTEMS_SUCCESSFUL != status) { + rtems_task_delete(tid); + goto cleanup; + } + + + /* synchronize with the helper task */ + rtems_semaphore_obtain(arg.sync, RTEMS_WAIT, RTEMS_NO_TIMEOUT); + + status = arg.status; + +cleanup: + if (arg.sync) + rtems_semaphore_delete(arg.sync); + + return status; +} + +int +nfsSetTimeout(uint32_t timeout_ms) +{ +rtems_interrupt_level k; +uint32_t s,us; + + if ( timeout_ms > 100000 ) { + /* out of range */ + return -1; + } + + s = timeout_ms/1000; + us = (timeout_ms % 1000) * 1000; + + rtems_interrupt_disable(k); + _nfscalltimeout.tv_sec = s; + _nfscalltimeout.tv_usec = us; + rtems_interrupt_enable(k); + + return 0; +} + +uint32_t +nfsGetTimeout( void ) +{ +rtems_interrupt_level k; +uint32_t s,us; + rtems_interrupt_disable(k); + s = _nfscalltimeout.tv_sec; + us = _nfscalltimeout.tv_usec; + rtems_interrupt_enable(k); + return s*1000 + us/1000; +} |