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mc/vfs/direntry.c

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/* Directory cache support -- so that you do not have copy of this in
* each and every filesystem.
*
* Written at 1998 by Pavel Machek <pavel@ucw.cz>, distribute under LGPL.
*
* $Id$
*
* Very loosely based on tar.c from midnight and archives.[ch] from
* avfs by Miklos Szeredi (mszeredi@inf.bme.hu)
*
* Unfortunately, I was unable to keep all filesystems
* uniform. tar-like filesystems use tree structure where each
* directory has pointers to its subdirectories. We can do this
* because we have full information about our archive.
*
* At ftp-like filesystems, situation is a little bit different. When
* you cd /usr/src/linux/drivers/char, you do _not_ want /usr,
* /usr/src, /usr/src/linux and /usr/src/linux/drivers to be
* listed. That means that we do not have complete information, and if
* /usr is symlink to /4, we will not know. Also we have to time out
* entries and things would get messy with tree-like approach. So we
* do different trick: root directory is completely special and
* completely fake, it contains entries such as 'usr', 'usr/src', ...,
* and we'll try to use custom find_entry function.
*
* Paths here do _not_ begin with '/', so root directory of
* archive/site is simply "". Beware. */
#include <config.h>
#include "utilvfs.h"
#include "xdirentry.h"
#include "../src/tty.h"
#define CALL(x) if (MEDATA->x) MEDATA->x
static volatile int total_inodes = 0, total_entries = 0;
vfs_s_inode *
vfs_s_new_inode (vfs *me, vfs_s_super *super, struct stat *initstat)
{
vfs_s_inode *ino;
ino = g_new0 (vfs_s_inode, 1);
if (!ino)
return NULL;
if (initstat)
ino->st = *initstat;
ino->super = super;
ino->st.st_nlink = 0;
ino->st.st_ino = MEDATA->inode_counter++;
ino->st.st_dev = MEDATA->rdev;
super->ino_usage++;
total_inodes++;
CALL (init_inode) (me, ino);
return ino;
}
vfs_s_entry *
vfs_s_new_entry (vfs *me, char *name, vfs_s_inode *inode)
{
vfs_s_entry *entry;
entry = g_new0 (struct vfs_s_entry, 1);
total_entries++;
if (name)
entry->name = g_strdup (name);
entry->ino = inode;
entry->ino->ent = entry;
CALL (init_entry) (me, entry);
return entry;
}
static void
vfs_s_free_inode (vfs *me, vfs_s_inode *ino)
{
if (!ino)
vfs_die ("Don't pass NULL to me");
/* ==0 can happen if freshly created entry is deleted */
if (ino->st.st_nlink <= 1){
while (ino->subdir){
vfs_s_free_entry (me, ino->subdir);
}
CALL (free_inode) (me, ino);
g_free (ino->linkname);
if (ino->localname){
unlink (ino->localname);
g_free(ino->localname);
}
total_inodes--;
ino->super->ino_usage--;
g_free(ino);
} else ino->st.st_nlink--;
}
void
vfs_s_free_entry (vfs *me, vfs_s_entry *ent)
{
int is_dot = 0;
if (ent->prevp){ /* It is possible that we are deleting freshly created entry */
*ent->prevp = ent->next;
if (ent->next)
ent->next->prevp = ent->prevp;
}
if (ent->name){
is_dot = (!strcmp (ent->name, ".")) || (!strcmp (ent->name, ".."));
g_free (ent->name);
ent->name = NULL;
}
if (!is_dot && ent->ino){
ent->ino->ent = NULL;
vfs_s_free_inode (me, ent->ino);
ent->ino = NULL;
}
total_entries--;
g_free(ent);
}
void
vfs_s_insert_entry (vfs *me, vfs_s_inode *dir, vfs_s_entry *ent)
{
vfs_s_entry **ep;
for (ep = &dir->subdir; *ep != NULL; ep = &((*ep)->next))
;
ent->prevp = ep;
ent->next = NULL;
ent->dir = dir;
*ep = ent;
ent->ino->st.st_nlink++;
}
struct stat *
vfs_s_default_stat (vfs *me, mode_t mode)
{
static struct stat st;
int myumask;
myumask = umask (022);
umask (myumask);
mode &= ~myumask;
st.st_mode = mode;
st.st_ino = 0;
st.st_dev = 0;
st.st_rdev = 0;
st.st_uid = getuid ();
st.st_gid = getgid ();
st.st_size = 0;
st.st_mtime = st.st_atime = st.st_ctime = time (NULL);
return &st;
}
void
vfs_s_add_dots (vfs *me, vfs_s_inode *dir, vfs_s_inode *parent)
{
struct vfs_s_entry *dot, *dotdot;
if (!parent)
parent = dir;
dot = vfs_s_new_entry (me, ".", dir);
dotdot = vfs_s_new_entry (me, "..", parent);
vfs_s_insert_entry (me, dir, dot);
vfs_s_insert_entry (me, dir, dotdot);
dir->st.st_nlink--;
parent->st.st_nlink--; /* We do not count "." and ".." into nlinks */
}
struct vfs_s_entry *
vfs_s_generate_entry (vfs *me, char *name, struct vfs_s_inode *parent, mode_t mode)
{
struct vfs_s_inode *inode;
struct stat *st;
st = vfs_s_default_stat (me, mode);
inode = vfs_s_new_inode (me, parent->super, st);
if (S_ISDIR (mode))
vfs_s_add_dots (me, inode, parent);
return vfs_s_new_entry (me, name, inode);
}
/* We were asked to create entries automagically */
vfs_s_entry *
vfs_s_automake (vfs *me, vfs_s_inode *dir, char *path, int flags)
{
struct vfs_s_entry *res;
char *sep = strchr (path, PATH_SEP);
if (sep)
*sep = 0;
res = vfs_s_generate_entry (me, path, dir, flags & FL_MKDIR ? (0777 | S_IFDIR) : 0777);
vfs_s_insert_entry (me, dir, res);
if (sep)
*sep = PATH_SEP;
return res;
}
/*
* Follow > 0: follow links, serves as loop protect,
* == -1: do not follow links
*/
vfs_s_entry *
vfs_s_find_entry_tree (vfs *me, vfs_s_inode *root, char *path, int follow, int flags)
{
unsigned int pseg;
vfs_s_entry *ent = NULL;
char p[MC_MAXPATHLEN] = "";
while (root){
int t;
while (*path == PATH_SEP) /* Strip leading '/' */
path++;
if (!path [0])
return ent;
for (pseg = 0; path[pseg] && path[pseg] != PATH_SEP; pseg++)
;
strcat (p, PATH_SEP_STR);
strncpy (p + (t = strlen (p)), path, pseg);
p[t + pseg] = '\0';
for (ent = root->subdir; ent != NULL; ent = ent->next)
if (strlen (ent->name) == pseg && (!strncmp (ent->name, path, pseg)))
/* FOUND! */
break;
if (!ent && (flags & (FL_MKFILE | FL_MKDIR)))
ent = vfs_s_automake (me, root, path, flags);
if (!ent) ERRNOR (ENOENT, NULL);
path += pseg;
/* here we must follow leading directories always; only the actual file is optional */
if (!(ent = vfs_s_resolve_symlink (me, ent, p, strchr (path, PATH_SEP) ? LINK_FOLLOW : follow)))
return NULL;
root = ent->ino;
}
return NULL;
}
static void
split_dir_name (vfs *me, char *path, char **dir, char **name, char **save)
{
char *s;
s = strrchr (path, PATH_SEP);
if (!s){
*save = NULL;
*name = path;
*dir = "";
} else {
*save = s;
*dir = path;
*s++ = 0;
*name = s;
}
}
vfs_s_entry *
vfs_s_find_entry_linear (vfs *me, vfs_s_inode *root, char *path, int follow, int flags)
{
vfs_s_entry* ent = NULL;
if (root->super->root != root)
vfs_die ("We have to use _real_ root. Always. Sorry." );
canonicalize_pathname (path);
if (!(flags & FL_DIR)){
char *dirname, *name, *save;
vfs_s_inode *ino;
split_dir_name (me, path, &dirname, &name, &save);
ino = vfs_s_find_inode (me, root, dirname, follow, flags | FL_DIR);
if (save)
*save = PATH_SEP;
return vfs_s_find_entry_tree (me, ino, name, follow, flags);
}
for (ent = root->subdir; ent != NULL; ent = ent->next)
if (!strcmp (ent->name, path))
break;
if (ent && (! (MEDATA->dir_uptodate) (me, ent->ino))){
#if 1
print_vfs_message (_("Dir cache expired for %s"), path);
#endif
vfs_s_free_entry (me, ent);
ent = NULL;
}
if (!ent){
vfs_s_inode *ino;
ino = vfs_s_new_inode (me, root->super, vfs_s_default_stat (me, S_IFDIR | 0755));
ent = vfs_s_new_entry (me, path, ino);
if ((MEDATA->dir_load) (me, ino, path) == -1){
vfs_s_free_entry (me, ent);
return NULL;
}
vfs_s_insert_entry (me, root, ent);
for (ent = root->subdir; ent != NULL; ent = ent->next)
if (!strcmp (ent->name, path))
break;
}
if (!ent)
vfs_die ("find_linear: success but directory is not there\n");
#if 0
if (!vfs_s_resolve_symlink (me, ent, follow)) return NULL;
#endif
return ent;
}
vfs_s_inode *
vfs_s_find_inode (vfs *me, vfs_s_inode *root, char *path, int follow, int flags)
{
vfs_s_entry *ent;
if ((MEDATA->find_entry == vfs_s_find_entry_tree) && (!*path))
return root;
ent = (MEDATA->find_entry)(me, root, path, follow, flags);
if (!ent)
return NULL;
return ent->ino;
}
/* Ouch - vfs_s_resolve symlink does not work for filesystems like ftp & fish:
you may not lookup with some other root! */
vfs_s_entry *
vfs_s_resolve_symlink (vfs *me, vfs_s_entry *entry, char *path, int follow)
{
char buf[MC_MAXPATHLEN], *linkname;
if (follow == LINK_NO_FOLLOW)
return entry;
if (follow == 0)
ERRNOR (ELOOP, NULL);
if (!entry)
ERRNOR (ENOENT, NULL);
if (!S_ISLNK (entry->ino->st.st_mode))
return entry;
linkname = entry->ino->linkname;
if (linkname == NULL)
ERRNOR (EFAULT, NULL);
if (MEDATA->find_entry == vfs_s_find_entry_linear) {
if (*linkname == PATH_SEP)
return (MEDATA->find_entry) (me, entry->dir->super->root, linkname, follow - 1, 0);
else { /* FIXME: this does not work */
char *fullpath = vfs_s_fullpath(me, entry->dir);
snprintf(buf, sizeof (buf), "%s/%s", fullpath, linkname);
g_free (fullpath);
return (MEDATA->find_entry) (me, entry->dir->super->root, buf, follow - 1, 0);
}
}
/* Convert absolute paths to relative ones */
if (*linkname == PATH_SEP) {
char *p, *q;
for (p = path, q = entry->ino->linkname; *p == *q; p++, q++);
while (*(--q) != PATH_SEP);
q++;
for (;; p++){
p = strchr (p, PATH_SEP);
if (!p){
strcat (buf, q);
break;
}
strcat (buf, "..");
strcat (buf, PATH_SEP_STR);
}
linkname = buf;
}
return (MEDATA->find_entry) (me, entry->dir, linkname, follow - 1, 0);
}
/* Ook, these were functions around directory entries / inodes */
/* -------------------------------- superblock games -------------------------- */
vfs_s_super *
vfs_s_new_super (vfs *me)
{
vfs_s_super *super;
super = g_new0 (struct vfs_s_super, 1);
super->me = me;
return super;
}
static void
vfs_s_insert_super (vfs *me, vfs_s_super *super)
{
super->next = MEDATA->supers;
super->prevp = &MEDATA->supers;
if (MEDATA->supers != NULL)
MEDATA->supers->prevp = &super->next;
MEDATA->supers = super;
}
void
vfs_s_free_super (vfs *me, vfs_s_super *super)
{
if (super->root){
vfs_s_free_inode (me, super->root);
super->root = NULL;
}
#if 0
/* FIXME: We currently leak small ammount of memory, sometimes. Fix it if you can. */
if (super->ino_usage)
message_1s1d (1, " Direntry warning ",
"Super ino_usage is %d, memory leak",
super->ino_usage);
if (super->want_stale)
message_1s (1, " Direntry warning ", "Super has want_stale set");
#endif
if (super->prevp){
*super->prevp = super->next;
if (super->next)
super->next->prevp = super->prevp;
}
CALL (free_archive) (me, super);
g_free (super->name);
super->name = NULL;
g_free(super);
}
/* ------------------------------------------------------------------------= */
static void
vfs_s_stamp_me (vfs *me, struct vfs_s_super *psup, char *fs_name)
{
struct vfs_stamping *parent;
vfs *v;
v = vfs_type (fs_name);
if (v == &vfs_local_ops){
parent = NULL;
} else {
parent = g_new (struct vfs_stamping, 1);
parent->v = v;
parent->next = 0;
parent->id = (*v->getid) (v, fs_name, &(parent->parent));
}
vfs_add_noncurrent_stamps (me, (vfsid) psup, parent);
vfs_rm_parents (parent);
}
char *
vfs_s_get_path_mangle (vfs *me, char *inname, struct vfs_s_super **archive, int flags)
{
char *local, *op, *archive_name;
int result = -1;
struct vfs_s_super *super;
void *cookie = NULL;
archive_name = inname;
vfs_split (inname, &local, &op);
if (!local)
local = "";
if (MEDATA->archive_check)
if (! (cookie = MEDATA->archive_check (me, archive_name, op)))
return NULL;
for (super = MEDATA->supers; super != NULL; super = super->next){
int i; /* 0 == other, 1 == same, return it, 2 == other but stop scanning */
if ((i = MEDATA->archive_same (me, super, archive_name, op, cookie))){
if (i==1) goto return_success;
else break;
}
}
if (flags & FL_NO_OPEN)
ERRNOR (EIO, NULL);
super = vfs_s_new_super (me);
result = MEDATA->open_archive (me, super, archive_name, op);
if (result == -1){
vfs_s_free_super (me, super);
ERRNOR (EIO, NULL);
}
if (!super->name)
vfs_die ("You have to fill name\n");
if (!super->root)
vfs_die ("You have to fill root inode\n");
vfs_s_insert_super (me, super);
vfs_s_stamp_me (me, super, archive_name);
return_success:
*archive = super;
return local;
}
char *
vfs_s_get_path (vfs *me, char *inname, struct vfs_s_super **archive, int flags)
{
char *buf = g_strdup( inname );
char *res = vfs_s_get_path_mangle (me, buf, archive, flags);
if (res)
res = g_strdup(res);
g_free(buf);
return res;
}
void
vfs_s_invalidate (vfs *me, vfs_s_super *super)
{
if (!super->want_stale){
vfs_s_free_inode (me, super->root);
super->root = vfs_s_new_inode (me, super, vfs_s_default_stat (me, S_IFDIR | 0755));
}
}
char *
vfs_s_fullpath (vfs *me, vfs_s_inode *ino)
{
/* For now, usable only on filesystems with _linear structure */
if (MEDATA->find_entry != vfs_s_find_entry_linear)
vfs_die ("Implement me!");
if (!ino->ent) /* That must be directory... */
ERRNOR (EAGAIN, NULL);
if ((!ino->ent->dir) || (!ino->ent->dir->ent)) /* It must be directory */
return g_strdup (ino->ent->name);
return g_strconcat (ino->ent->dir->ent->name, PATH_SEP_STR,
ino->ent->name, NULL);
}
/* Support of archives */
/* ------------------------ readdir & friends ----------------------------- */
vfs_s_super *vfs_s_super_from_path (vfs *me, char *name)
{
struct vfs_s_super *super;
if (!vfs_s_get_path_mangle (me, name, &super, 0))
return NULL;
return super;
}
vfs_s_inode *
vfs_s_inode_from_path (vfs *me, char *name, int flags)
{
struct vfs_s_super *super;
struct vfs_s_inode *ino;
char *q;
if (!(q = vfs_s_get_path_mangle (me, name, &super, 0)))
return NULL;
ino = vfs_s_find_inode (me, super->root, q, flags & FL_FOLLOW ? LINK_FOLLOW : LINK_NO_FOLLOW, flags & ~FL_FOLLOW);
if ((!ino) && (!*q))
/* We are asking about / directory of ftp server: assume it exists */
ino = vfs_s_find_inode (me, super->root, q, flags & FL_FOLLOW ? LINK_FOLLOW : LINK_NO_FOLLOW, FL_DIR | (flags & ~FL_FOLLOW));
return ino;
}
struct dirhandle {
vfs_s_entry *cur;
vfs_s_inode *dir;
};
void *
vfs_s_opendir (vfs *me, char *dirname)
{
struct vfs_s_inode *dir;
struct dirhandle *info;
dir = vfs_s_inode_from_path (me, dirname, FL_DIR | FL_FOLLOW);
if (!dir)
return NULL;
if (!S_ISDIR (dir->st.st_mode))
ERRNOR (ENOTDIR, NULL);
dir->st.st_nlink++;
#if 0
if (!dir->subdir) /* This can actually happen if we allow empty directories */
ERRNOR (EAGAIN, NULL);
#endif
info = g_new (struct dirhandle, 1);
info->cur = dir->subdir;
info->dir = dir;
return info;
}
void *
vfs_s_readdir(void *data)
{
static union vfs_dirent dir;
struct dirhandle *info = (struct dirhandle *) data;
if (!(info->cur))
return NULL;
if (info->cur->name) {
strncpy(dir.dent.d_name, info->cur->name, MC_MAXPATHLEN);
dir.dent.d_name[MC_MAXPATHLEN] = 0;
} else {
vfs_die("Null in structure-can not happen");
}
compute_namelen(&dir.dent);
info->cur = info->cur->next;
return (void *) &dir;
}
int
vfs_s_telldir (void *data)
{
struct dirhandle *info = (struct dirhandle *) data;
struct vfs_s_entry *cur;
int num = 0;
cur = info->dir->subdir;
while (cur!=NULL){
if (cur == info->cur)
return num;
num++;
cur = cur->next;
}
return -1;
}
void
vfs_s_seekdir (void *data, int offset)
{
struct dirhandle *info = (struct dirhandle *) data;
int i;
info->cur = info->dir->subdir;
for (i=0; i<offset; i++)
vfs_s_readdir (data);
}
int
vfs_s_closedir (void *data)
{
struct dirhandle *info = (struct dirhandle *) data;
struct vfs_s_inode *dir = info->dir;
vfs_s_free_inode (dir->super->me, dir);
g_free (data);
return 0;
}
int
vfs_s_chdir (vfs *me, char *path)
{
void *data;
if (!(data = vfs_s_opendir (me, path)))
return -1;
vfs_s_closedir (data);
return 0;
}
/* --------------------------- stat and friends ---------------------------- */
static int
vfs_s_internal_stat (vfs *me, char *path, struct stat *buf, int flag)
{
struct vfs_s_inode *ino;
if (!(ino = vfs_s_inode_from_path (me, path, flag)))
return -1;
*buf = ino->st;
return 0;
}
int
vfs_s_stat (vfs *me, char *path, struct stat *buf)
{
return vfs_s_internal_stat (me, path, buf, FL_FOLLOW);
}
int
vfs_s_lstat (vfs *me, char *path, struct stat *buf)
{
return vfs_s_internal_stat (me, path, buf, FL_NONE);
}
int
vfs_s_fstat (void *fh, struct stat *buf)
{
*buf = FH->ino->st;
return 0;
}
int
vfs_s_readlink (vfs *me, char *path, char *buf, int size)
{
struct vfs_s_inode *ino;
ino = vfs_s_inode_from_path (me, path, 0);
if (!ino)
return -1;
if (!S_ISLNK (ino->st.st_mode))
ERRNOR (EINVAL, -1);
if (ino->linkname == NULL)
ERRNOR (EFAULT, -1);
strncpy (buf, ino->linkname, size);
*(buf+size-1) = 0;
return strlen (buf);
}
void *
vfs_s_open (vfs *me, char *file, int flags, int mode)
{
int was_changed = 0;
struct vfs_s_fh *fh;
vfs_s_super *super;
char *q;
struct vfs_s_inode *ino;
if ((q = vfs_s_get_path_mangle (me, file, &super, 0)) == NULL)
return NULL;
ino = vfs_s_find_inode (me, super->root, q, LINK_FOLLOW, FL_NONE);
if (ino && ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)))
ERRNOR (EEXIST, NULL);
if (!ino){
char *dirname, *name, *save;
vfs_s_entry *ent;
vfs_s_inode *dir;
int tmp_handle;
if (!(flags & O_CREAT))
return NULL;
split_dir_name (me, q, &dirname, &name, &save);
/* FIXME: if vfs_s_find_inode returns NULL, this will do rather bad
things. */
dir = vfs_s_find_inode (me, super->root, dirname, LINK_FOLLOW, FL_DIR);
if (save)
*save = PATH_SEP;
ent = vfs_s_generate_entry (me, name, dir, 0755);
ino = ent->ino;
vfs_s_insert_entry (me, dir, ent);
tmp_handle = mc_mkstemps (&ino->localname, me->name, NULL);
if (tmp_handle == -1)
return NULL;
close (tmp_handle);
was_changed = 1;
}
if (S_ISDIR (ino->st.st_mode))
ERRNOR (EISDIR, NULL);
fh = g_new (struct vfs_s_fh, 1);
fh->pos = 0;
fh->ino = ino;
fh->handle = -1;
fh->changed = was_changed;
fh->linear = 0;
if (IS_LINEAR(flags)) {
if (MEDATA->linear_start) {
print_vfs_message (_("Starting linear transfer..."));
if (!MEDATA->linear_start (me, fh, 0)){
g_free(fh);
return NULL;
}
}
} else if ((MEDATA->fh_open) && (MEDATA->fh_open (me, fh, flags, mode))){
g_free(fh);
return NULL;
}
if (fh->ino->localname){
fh->handle = open (fh->ino->localname, NO_LINEAR(flags), mode);
if (fh->handle == -1){
g_free(fh);
ERRNOR (errno, NULL);
}
}
/* i.e. we had no open files and now we have one */
vfs_rmstamp (me, (vfsid) super, 1);
super->fd_usage++;
fh->ino->st.st_nlink++;
return fh;
}
int
vfs_s_read (void *fh, char *buffer, int count)
{
int n;
vfs *me = FH_SUPER->me;
if (FH->linear == LS_LINEAR_CLOSED)
vfs_die ("linear_start() did not set linear_state!");
if (FH->linear == LS_LINEAR_OPEN)
return MEDATA->linear_read (me, FH, buffer, count);
if (FH->handle != -1){
n = read (FH->handle, buffer, count);
if (n < 0)
me->verrno = errno;
return n;
}
vfs_die ("vfs_s_read: This should not happen\n");
return -1;
}
int
vfs_s_write (void *fh, char *buffer, int count)
{
int n;
vfs *me = FH_SUPER->me;
if (FH->linear)
vfs_die ("no writing to linear files, please");
FH->changed = 1;
if (FH->handle != -1){
n = write (FH->handle, buffer, count);
if (n < 0)
me->verrno = errno;
return n;
}
vfs_die ("vfs_s_write: This should not happen\n");
return 0;
}
int
vfs_s_lseek (void *fh, off_t offset, int whence)
{
off_t size = FH->ino->st.st_size;
if (FH->handle != -1){ /* If we have local file opened, we want to work with it */
int retval = lseek (FH->handle, offset, whence);
if (retval == -1)
FH->ino->super->me->verrno = errno;
return retval;
}
switch (whence){
case SEEK_CUR:
offset += FH->pos; break;
case SEEK_END:
offset += size; break;
}
if (offset < 0)
FH->pos = 0;
else if (offset < size)
FH->pos = offset;
else
FH->pos = size;
return FH->pos;
}
int
vfs_s_close (void *fh)
{
int res = 0;
vfs *me = FH_SUPER->me;
FH_SUPER->fd_usage--;
if (!FH_SUPER->fd_usage){
struct vfs_stamping *parent;
vfs *v;
v = vfs_type (FH_SUPER->name);
if (v == &vfs_local_ops){
parent = NULL;
} else {
parent = g_new (struct vfs_stamping, 1);
parent->v = v;
parent->next = 0;
parent->id = (*v->getid) (v, FH_SUPER->name, &(parent->parent));
}
vfs_add_noncurrent_stamps (me, (vfsid) (FH_SUPER), parent);
vfs_rm_parents (parent);
}
if (FH->linear == LS_LINEAR_OPEN)
MEDATA->linear_close (me, fh);
if (MEDATA->fh_close)
res = MEDATA->fh_close (me, fh);
if (FH->changed && MEDATA->file_store){
char *s = vfs_s_fullpath (me, FH->ino);
if (!s)
res = -1;
else {
res = MEDATA->file_store (me, fh, s, FH->ino->localname);
g_free (s);
}
vfs_s_invalidate (me, FH_SUPER);
}
if (FH->handle != -1)
close (FH->handle);
vfs_s_free_inode (me, FH->ino);
g_free (fh);
return res;
}
int
vfs_s_retrieve_file(vfs *me, struct vfs_s_inode *ino)
{
/* If you want reget, you'll have to open file with O_LINEAR */
off_t total = 0;
char buffer[8192];
int handle, n;
off_t stat_size = ino->st.st_size;
struct vfs_s_fh fh;
memset(&fh, 0, sizeof(fh));
fh.ino = ino;
fh.handle = -1;
handle = mc_mkstemps (&ino->localname, me->name, NULL);
if (handle == -1) {
me->verrno = errno;
goto error_4;
}
if (!MEDATA->linear_start (me, &fh, 0))
goto error_3;
/* Clear the interrupt status */
while ((n = MEDATA->linear_read (me, &fh, buffer, sizeof(buffer)))) {
if (n < 0)
goto error_1;
total += n;
vfs_print_stats (me->name, _("Getting file"), ino->ent->name, total, stat_size);
if (write(handle, buffer, n) < 0) {
me->verrno = errno;
goto error_1;
}
}
MEDATA->linear_close (me, &fh);
close(handle);
return 0;
error_1:
MEDATA->linear_close (me, &fh);
error_3:
disable_interrupt_key();
close(handle);
unlink(ino->localname);
error_4:
g_free(ino->localname);
ino->localname = NULL;
return -1;
}
/* ------------------------------- mc support ---------------------------- */
void
vfs_s_fill_names (vfs *me, void (*func)(char *))
{
struct vfs_s_super *a = MEDATA->supers;
char *name;
while (a){
name = g_strconcat ( a->name, "#", me->prefix, "/", /* a->current_dir->name, */ NULL);
(*func)(name);
g_free (name);
a = a->next;
}
}
int
vfs_s_ferrno (vfs *me)
{
return me->verrno;
}
void
vfs_s_dump (vfs *me, char *prefix, vfs_s_inode *ino)
{
printf ("%s %s %d ", prefix, S_ISDIR (ino->st.st_mode) ? "DIR" : "FILE", ino->st.st_mode);
if (!ino->subdir)
printf ("FILE\n");
else
{
struct vfs_s_entry *ent;
for (ent = ino->subdir; ent ; ent = ent->next){
char *s = g_strconcat (prefix, "/", ent->name, NULL);
if (ent->name[0] == '.')
printf ("%s IGNORED\n", s);
else
vfs_s_dump (me, s, ent->ino);
g_free(s);
}
}
}
char *
vfs_s_getlocalcopy (vfs *me, char *path)
{
struct vfs_s_inode *ino;
char buf[MC_MAXPATHLEN];
strncpy (buf, path, MC_MAXPATHLEN);
ino = vfs_s_inode_from_path (me, path, FL_FOLLOW | FL_NONE);
if (!ino->localname)
ino->localname = mc_def_getlocalcopy (me, buf);
/* FIXME: fd_usage++ missing */
return g_strdup (ino->localname);
}
int
vfs_s_setctl (vfs *me, char *path, int ctlop, char *arg)
{
vfs_s_inode *ino = vfs_s_inode_from_path (me, path, 0);
if (!ino)
return 0;
switch (ctlop){
case MCCTL_WANT_STALE_DATA:
ino->super->want_stale = 1;
return 1;
case MCCTL_NO_STALE_DATA:
ino->super->want_stale = 0;
vfs_s_invalidate(me, ino->super);
return 1;
#if 0 /* FIXME: We should implement these */
case MCCTL_REMOVELOCALCOPY:
return remove_temp_file (path);
case MCCTL_FORGET_ABOUT:
my_forget(path);
return 0;
#endif
}
return 0;
}
/* ----------------------------- Stamping support -------------------------- */
vfsid
vfs_s_getid (vfs *me, char *path, struct vfs_stamping **parent)
{
vfs_s_super *archive;
vfs *v;
char *p;
vfsid id;
struct vfs_stamping *par;
*parent = NULL;
if (!(p = vfs_s_get_path (me, path, &archive, FL_NO_OPEN)))
return (vfsid) -1;
g_free(p);
v = vfs_type (archive->name);
id = (*v->getid) (v, archive->name, &par);
if (id != (vfsid)-1){
*parent = g_new (struct vfs_stamping, 1);
(*parent)->v = v;
(*parent)->id = id;
(*parent)->parent = par;
(*parent)->next = NULL;
}
return (vfsid) archive;
}
int
vfs_s_nothingisopen (vfsid id)
{
/* Our data structures should survive free of superblock at any time */
return 1;
}
void
vfs_s_free (vfsid id)
{
vfs_s_free_super (((vfs_s_super *)id)->me, (vfs_s_super *)id);
}
/* ----------- Utility functions for networked filesystems -------------- */
int
vfs_s_select_on_two (int fd1, int fd2)
{
fd_set set;
struct timeval timeout;
int v;
int maxfd = (fd1 > fd2 ? fd1 : fd2) + 1;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
FD_ZERO (&set);
FD_SET (fd1, &set);
FD_SET (fd2, &set);
v = select (maxfd, &set, 0, 0, &timeout);
if (v <= 0)
return v;
if (FD_ISSET (fd1, &set))
return 1;
if (FD_ISSET (fd2, &set))
return 2;
return -1;
}
int
vfs_s_get_line (vfs *me, int sock, char *buf, int buf_len, char term)
{
FILE *logfile = MEDATA->logfile;
int i, status;
char c;
for (i = 0; i < buf_len - 1; i++, buf++){
if (read (sock, buf, sizeof(char)) <= 0)
return 0;
if (logfile){
fwrite (buf, 1, 1, logfile);
fflush (logfile);
}
if (*buf == term){
*buf = 0;
return 1;
}
}
/* Line is too long - terminate buffer and discard the rest of line */
*buf = 0;
while ((status = read (sock, &c, sizeof (c))) > 0){
if (logfile){
fwrite (&c, 1, 1, logfile);
fflush (logfile);
}
if (c == '\n')
return 1;
}
return 0;
}
int
vfs_s_get_line_interruptible (vfs *me, char *buffer, int size, int fd)
{
int n;
int i;
enable_interrupt_key ();
for (i = 0; i < size-1; i++){
n = read (fd, buffer+i, 1);
disable_interrupt_key ();
if (n == -1 && errno == EINTR){
buffer [i] = 0;
return EINTR;
}
if (n == 0){
buffer [i] = 0;
return 0;
}
if (buffer [i] == '\n'){
buffer [i] = 0;
return 1;
}
}
buffer [size-1] = 0;
return 0;
}
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