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davfs2/src/dav_coda.c

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/* dav_coda.c: interface to the Coda kernel module CODA_KERNEL_VERSION 3.
Copyright (C) 2006, 2007, 2008, 2009 Werner Baumann
This file is part of davfs2.
davfs2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
davfs2 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with davfs2; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "config.h"
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIBINTL_H
#include <libintl.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include "defaults.h"
#include "mount_davfs.h"
#include "cache.h"
#include "kernel_interface.h"
#include "coda.h"
#ifdef ENABLE_NLS
#define _(String) gettext(String)
#else
#define _(String) String
#endif
/* Constants */
/*===========*/
/* Size of buffer for communication with the kernel module. */
#define BUF_SIZE 2048
/* This constants are used by davfs2 to fill fields of struct CodaFid that
are not used by davfs2, but are expected by coda. */
#define DAV_VOL 0x01234567
#define DAV_VNODE 0xffffffff
/* Private global variables */
/*==========================*/
/* Buffer used for communication with the kernel module (in and out). */
static char *buf;
/* The preferred blocksize used by the local filesystem for cache files.
Used by set_attr(). */
static unsigned int blocksize;
/* Alignment boundary of dav_node in byte.
Used to compute file numbers from node pointers. */
static size_t alignment;
/* Send debug messages to syslog if != 0. */
int debug;
/* Private function prototypes */
/*=============================*/
/* Functions to handle upcalls fromthe kernel module. */
static uint32_t
coda_access(void);
static uint32_t
coda_close(void);
static uint32_t
coda_create(void);
static uint32_t
coda_getattr(void);
static uint32_t
coda_lookup(void);
static uint32_t
coda_mkdir(void);
static uint32_t
coda_open_by_fd(void);
static uint32_t
coda_root(void);
static uint32_t
coda_setattr(void);
static uint32_t
coda_statfs(void);
/* Functions that will do a downcall to the kernel module. */
static void
coda_flush(int device);
/* Auxiliary functions. */
static off_t
write_dir_entry(int fd, off_t off, const dav_node *node, const char *name);
static void
set_attr(struct coda_vattr *attr, const dav_node *node);
/* Public functions */
/*==================*/
void
dav_coda_loop(int device, size_t bufsize, time_t idle_time,
dav_is_mounted_fn is_mounted, volatile int *keep_on_running,
int dbg)
{
debug = dbg;
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "coda kernel version 3");
buf = malloc(BUF_SIZE);
if (!buf) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_ERR),
_("can't allocate message buffer"));
return;
}
static int flush = 0;
alignment = dav_register_kernel_interface(&write_dir_entry, &flush,
&blocksize);
struct timeval tv;
tv.tv_sec = idle_time;
tv.tv_usec = 0;
time_t last_tidy_cache = time(NULL);
while (*keep_on_running) {
fd_set fds;
FD_ZERO(&fds);
FD_SET(device, &fds);
int ret = select(device + 1, &fds, NULL, NULL, &tv);
if (ret > 0) {
ssize_t bytes_read = read(device, buf, BUF_SIZE);
if (bytes_read <= 0) {
if (bytes_read == 0 || errno == EINTR || errno == EAGAIN) {
if (time(NULL) < (last_tidy_cache + idle_time)) {
tv.tv_sec = last_tidy_cache + idle_time - time(NULL);
} else {
tv.tv_sec = 0;
}
continue;
}
break;
}
} else if (ret == 0) {
if (!is_mounted())
break;
if (dav_tidy_cache() == 0) {
tv.tv_sec = idle_time;
last_tidy_cache = time(NULL);
} else {
tv.tv_sec = 0;
}
continue;
} else {
break;
}
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
uint32_t len;
switch (ih->opcode) {
case CODA_ROOT:
len = coda_root();
break;
case CODA_OPEN_BY_FD:
len = coda_open_by_fd();
break;
case CODA_OPEN:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_OPEN:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_CLOSE:
len = coda_close();
last_tidy_cache = 0;
break;
case CODA_IOCTL:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_IOCTL:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_GETATTR:
len = coda_getattr();
break;
case CODA_SETATTR:
len = coda_setattr();
break;
case CODA_ACCESS:
len = coda_access();
break;
case CODA_LOOKUP:
len = coda_lookup();
break;
case CODA_CREATE:
len = coda_create();
break;
case CODA_REMOVE: {
struct coda_remove_in *in = (struct coda_remove_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_REMOVE:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " p %p, %s", node,
buf + in->name);
}
oh->result = dav_remove(node, buf + in->name, ih->uid);
len = sizeof(struct coda_out_hdr);
break; }
case CODA_LINK:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_LINK:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_RENAME: {
struct coda_rename_in *in = (struct coda_rename_in *) buf;
dav_node *src = *((dav_node **) &(in->sourceFid.opaque[2]));
dav_node *dst = *((dav_node **) &(in->destFid.opaque[2]));
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_RENAME:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " sp %p, %s", src,
buf + in->srcname);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " dp %p, %s", dst,
buf + in->destname);
}
oh->result = dav_rename(src, buf + in->srcname, dst,
buf + in->destname, ih->uid);
len = sizeof(struct coda_out_hdr);
break; }
case CODA_MKDIR:
len = coda_mkdir();
break;
case CODA_RMDIR: {
struct coda_rmdir_in *in = (struct coda_rmdir_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_RMDIR:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " p %p, %s", node,
buf + in->name);
}
oh->result = dav_rmdir(node, buf + in->name, ih->uid);
len = sizeof(struct coda_out_hdr);
break; }
case CODA_SYMLINK:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_SYMLINK:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_READLINK:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_READLINK:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_FSYNC: {
struct coda_fsync_in *in = (struct coda_fsync_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_FSYNC:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p", node);
}
oh->result = dav_sync(node);
len = sizeof(struct coda_out_hdr);
break; }
case CODA_VGET:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_VGET:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_OPEN_BY_PATH:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG),
"CODA_OPEN_BY_PATH:");
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
case CODA_STATFS:
len = coda_statfs();
break;
case CODA_STORE: {
struct coda_store_in *in = (struct coda_store_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_STORE:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p, f 0x%x",
node, in->flags);
}
oh->result = dav_sync(node);
len = sizeof(struct coda_out_hdr);
break; }
case CODA_RELEASE:
len = coda_close();
last_tidy_cache = 0;
break;
default:
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG),
"UNKNOWN CODA CALL %u", ih->opcode);
oh->result = ENOTSUP;
len = sizeof(struct coda_out_hdr);
break;
}
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "RET: %s",
strerror(oh->result));
ssize_t n = 0;
ssize_t w = 0;
while (n < len && w >= 0) {
w = write(device, buf + n, len - n);
n += w;
}
if (time(NULL) < (last_tidy_cache + idle_time)) {
tv.tv_sec = last_tidy_cache + idle_time - time(NULL);
} else {
dav_tidy_cache();
tv.tv_sec = idle_time;
last_tidy_cache = time(NULL);
}
if (flush) {
coda_flush(device);
flush = 0;
}
}
}
/* Private functions */
/*===================*/
/* Functions to handle upcalls fromthe kernel module.
The cache module only uses data types from the C-library. For file access,
mode and the like it only uses symbolic constants defined in the C-library.
So the main porpose of this functions is to translate from kernel specific
types and constants to types and constants from the C-library, and back.
All of this functions return the amount of data in buf that is to be
send to the kernel module. */
static uint32_t
coda_access(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_access_in *in = (struct coda_access_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_ACCESS:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p, f %x",
node, in->flags);
}
int how = (in->flags & C_A_R_OK) ? R_OK : 0;
how |= (in->flags & C_A_W_OK) ? W_OK : 0;
how |= (in->flags & C_A_X_OK) ? X_OK : 0;
how |= (in->flags & C_A_F_OK) ? F_OK : 0;
oh->result = dav_access(node, ih->uid, how);
return sizeof(struct coda_out_hdr);
}
static uint32_t
coda_close(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_close_in *in = (struct coda_close_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
if (debug) {
if (ih->opcode == CODA_CLOSE) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_CLOSE:");
} else {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_RELEASE:");
}
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p, f %x",
node, in->flags);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " pid %i, pgid %i",
ih->pid, ih->pgid);
}
int flags = 0;
if ((in->flags & C_O_READ) && (in->flags & C_O_WRITE)) {
flags = O_RDWR;
} else if (in->flags & C_O_READ) {
flags = O_RDONLY;
} else if (in->flags & C_O_WRITE) {
flags = O_WRONLY;
}
oh->result = dav_close(node, 0, flags, ih->pid, ih->pgid);
return sizeof(struct coda_out_hdr);
}
static uint32_t
coda_create(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_create_in *in = (struct coda_create_in *) buf;
dav_node *parent = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_create_out *out = (struct coda_create_out *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_CREATE:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " p %p, m %o",
parent, in->mode);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " %s", buf + in->name);
}
dav_node *node = NULL;
oh->result = dav_create(&node, parent, buf + in->name, ih->uid,
in->mode & DAV_A_MASK);
if (oh->result || !node) {
if (!oh->result)
oh->result = EIO;
return sizeof(struct coda_out_hdr);
}
out->VFid.opaque[0] = DAV_VOL;
out->VFid.opaque[1] = DAV_VNODE;
out->VFid.opaque[3] = 0;
*((dav_node **) &(out->VFid.opaque[2])) = node;
set_attr(&out->attr, node);
return sizeof(struct coda_create_out);
}
static uint32_t
coda_getattr(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_getattr_in *in = (struct coda_getattr_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_getattr_out *out = (struct coda_getattr_out *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_GETATTR:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p", node);
}
oh->result = dav_getattr(node, ih->uid);
if (oh->result)
return sizeof(struct coda_out_hdr);
set_attr(&out->attr, node);
return sizeof(struct coda_getattr_out);
}
static uint32_t
coda_lookup(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_lookup_in *in = (struct coda_lookup_in *) buf;
dav_node *parent = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_lookup_out *out = (struct coda_lookup_out *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_LOOKUP:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " p %p, %s", parent,
buf + in->name);
}
dav_node *node = NULL;
oh->result = dav_lookup(&node, parent, buf + in->name, ih->uid);
if (oh->result || !node) {
if (!oh->result)
oh->result = EIO;
return sizeof(struct coda_out_hdr);
}
out->VFid.opaque[0] = DAV_VOL;
out->VFid.opaque[1] = DAV_VNODE;
out->VFid.opaque[3] = 0;
*((dav_node **) &(out->VFid.opaque[2])) = node;
out->vtype = (node->mode & S_IFDIR) ? CDT_DIR : CDT_REG;
return sizeof(struct coda_lookup_out);
}
static uint32_t
coda_mkdir(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_mkdir_in *in = (struct coda_mkdir_in *) buf;
dav_node *parent = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_mkdir_out *out = (struct coda_mkdir_out *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_MKDIR:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " p %p, %s", parent,
buf + in->name);
}
dav_node *node = NULL;
oh->result = dav_mkdir(&node, parent, buf + in->name, ih->uid,
in->attr.va_mode & DAV_A_MASK);
if (oh->result || !node) {
if (!oh->result)
oh->result = EIO;
return sizeof(struct coda_out_hdr);
}
out->VFid.opaque[0] = DAV_VOL;
out->VFid.opaque[1] = DAV_VNODE;
out->VFid.opaque[3] = 0;
*((dav_node **) &(out->VFid.opaque[2])) = node;
set_attr(&out->attr, node);
return sizeof(struct coda_mkdir_out);
}
static uint32_t
coda_open_by_fd(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_open_by_fd_in *in = (struct coda_open_by_fd_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_open_by_fd_out *out = (struct coda_open_by_fd_out *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_OPEN_BY_FD:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p, f %x", node,
in->flags);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " pid %i, pgid %i",
ih->pid, ih->pgid);
}
int flags = 0;
if ((in->flags & C_O_READ) && (in->flags & C_O_WRITE)) {
flags = O_RDWR;
} else if (in->flags & C_O_READ) {
flags = O_RDONLY;
} else if (in->flags & C_O_WRITE) {
flags = O_WRONLY;
}
flags |= (in->flags & C_O_TRUNC) ? O_TRUNC : 0;
oh->result = dav_open(&out->fd, node, flags, ih->pid, ih->pgid, ih->uid);
if (oh->result || !out->fd) {
if (!oh->result)
oh->result = EIO;
return sizeof(struct coda_out_hdr);
}
return sizeof(struct coda_open_by_fd_out);
}
static uint32_t
coda_root(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_root_out *out = (struct coda_root_out *) buf;
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_ROOT:");
dav_node *node = NULL;
oh->result = dav_root(&node, ih->uid);
if (oh->result || !node) {
if (!oh->result)
oh->result = EIO;
return sizeof(struct coda_out_hdr);
}
out->VFid.opaque[0] = DAV_VOL;
out->VFid.opaque[1] = DAV_VNODE;
out->VFid.opaque[3] = 0;
*((dav_node **) &(out->VFid.opaque[2])) = node;
return sizeof(struct coda_root_out);
}
static uint32_t
coda_setattr(void)
{
struct coda_in_hdr *ih = (struct coda_in_hdr *) buf;
struct coda_setattr_in *in = (struct coda_setattr_in *) buf;
dav_node *node = *((dav_node **) &(in->VFid.opaque[2]));
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
if (debug) {
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_SETATTR:");
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " n %p, m %o", node,
in->attr.va_mode);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " uid: %i, gid: %i",
in->attr.va_uid, in->attr.va_gid);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " at %li, mt %li",
in->attr.va_atime.tv_sec, in->attr.va_mtime.tv_sec);
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " ct %li, sz %llu",
in->attr.va_ctime.tv_sec, in->attr.va_size);
}
oh->result = dav_setattr(node, ih->uid, in->attr.va_mode != USHRT_MAX,
in->attr.va_mode & DAV_A_MASK,
in->attr.va_uid != UINT32_MAX, in->attr.va_uid,
in->attr.va_gid != UINT32_MAX, in->attr.va_gid,
in->attr.va_atime.tv_sec != -1,
in->attr.va_atime.tv_sec,
in->attr.va_mtime.tv_sec != -1,
in->attr.va_mtime.tv_sec,
in->attr.va_size != UINT64_MAX,
in->attr.va_size);
return sizeof(struct coda_out_hdr);
}
static uint32_t
coda_statfs(void)
{
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
struct coda_statfs_out *out = (struct coda_statfs_out *) buf;
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "CODA_STATFS:");
dav_stat st = dav_statfs();
out->stat.f_blocks = st.blocks;
out->stat.f_bfree = st.bfree;
out->stat.f_bavail = st.bavail;
out->stat.f_files = st.files;
out->stat.f_ffree = st.ffree;
oh->result = 0;
return sizeof(struct coda_statfs_out);
}
/* Functions that will do a downcall to the kernel module. */
/* Downcall to inform the kernel that nodes have been added or removed. */
static void
coda_flush(int device)
{
struct coda_out_hdr *oh = (struct coda_out_hdr *) buf;
if (debug)
syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), " CODA_FLUSH:");
oh->opcode = CODA_FLUSH;
oh->unique = 0;
oh->result = 0;
ssize_t n = 0;
ssize_t w = 0;
while (n < sizeof(struct coda_out_hdr) && w >= 0) {
w = write(device, buf + n, sizeof(struct coda_out_hdr) - n);
n += w;
}
}
/* Auxiliary functions. */
/* Writes a struct venus_dirent to file with file descriptor fd.
fd : An open file descriptor to write to.
off : The current file size.
name : File name; if NULL, the last, empty entry is written.
return value : New size of the file. -1 in case of an error. */
static off_t
write_dir_entry(int fd, off_t off, const dav_node *node, const char *name)
{
struct venus_dirent entry;
size_t head = offsetof(struct venus_dirent, d_name);
if (name) {
entry.d_fileno = (size_t) node / alignment;
entry.d_type = (S_ISDIR(node->mode)) ? CDT_DIR : CDT_REG;
entry.d_namlen = (strlen(name) > CODA_MAXNAMLEN)
? CODA_MAXNAMLEN : strlen(name);
entry.d_reclen = (head + entry.d_namlen +4) & ~3;
} else {
entry.d_fileno = 0;
entry.d_type = 0;
entry.d_namlen = 0;
entry.d_reclen = (head + 4) & ~3;
}
size_t size = 0;
ssize_t ret = 0;
while (ret >= 0 && size < head) {
ret = write(fd, (char *) &entry + size, head - size);
size += ret;
}
if (size != head)
return -1;
ret = 0;
while (ret >= 0 && size < (head + entry.d_namlen)) {
ret = write(fd, name + size - head, entry.d_namlen - size + head);
size += ret;
}
if (size != (head + entry.d_namlen))
return -1;
ret = 0;
while (ret >= 0 && size < entry.d_reclen) {
ret = write(fd, "\0", 1);
size += ret;
}
if (size != entry.d_reclen)
return -1;
return off + entry.d_reclen;
}
/* Translates attribute from node to attr.
Note: Members va_fileid, v_gen, va_flags, va_rdev and va_filerev have no
meaning for davfs. va_fileid is treated like d_fileno in struct venus_dirent,
the other are set to zero. The meaning of va_type is not clear at all.
Times are only set with 1 second precision, as this is the precision of the
last-modified time in HTTP. */
static void
set_attr(struct coda_vattr *attr, const dav_node *node)
{
attr->va_type = 0;
attr->va_mode = node->mode;
if (S_ISDIR(node->mode)) {
attr->va_nlink = node->nref;
} else {
attr->va_nlink = 1;
}
attr->va_uid = node->uid;
attr->va_gid = node->gid;
attr->va_fileid = (size_t) node / alignment;
attr->va_size = node->size;
attr->va_blocksize = blocksize;
attr->va_atime.tv_sec = node->atime;
attr->va_atime.tv_nsec = 0;
attr->va_mtime.tv_sec = node->mtime;
attr->va_mtime.tv_nsec = 0;
attr->va_ctime.tv_sec = node->ctime;
attr->va_ctime.tv_nsec = 0;
attr->va_gen = 0;
attr->va_flags = 0;
attr->va_rdev = 0;
attr->va_bytes = node->size;
attr->va_filerev = 0;
}
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