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Diffstat (limited to '')
| -rw-r--r-- | lib/vfs/direntry.c | 1738 |
1 files changed, 1738 insertions, 0 deletions
diff --git a/lib/vfs/direntry.c b/lib/vfs/direntry.c new file mode 100644 index 0000000..4ea5d11 --- /dev/null +++ b/lib/vfs/direntry.c @@ -0,0 +1,1738 @@ +/* + Directory cache support + + Copyright (C) 1998-2022 + Free Software Foundation, Inc. + + Written by: + Pavel Machek <pavel@ucw.cz>, 1998 + Slava Zanko <slavazanko@gmail.com>, 2010-2013 + Andrew Borodin <aborodin@vmail.ru> 2010-2022 + + This file is part of the Midnight Commander. + + The Midnight Commander 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. + + The Midnight Commander 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 this program. If not, see <http://www.gnu.org/licenses/>. + + \warning Paths here do _not_ begin with '/', so root directory of + archive/site is simply "". + */ + +/** \file + * \brief Source: directory cache support + * + * So that you do not have copy of this in each and every filesystem. + * + * 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. + * + * \author Pavel Machek <pavel@ucw.cz> + * \date 1998 + * + */ + +#include <config.h> + +#include <errno.h> +#include <inttypes.h> /* uintmax_t */ +#include <stdarg.h> +#ifdef HAVE_SYS_SELECT_H +#include <sys/select.h> +#endif +#include <sys/types.h> +#include <unistd.h> + +#include "lib/global.h" + +#include "lib/tty/tty.h" /* enable/disable interrupt key */ +#include "lib/util.h" /* canonicalize_pathname_custom() */ +#if 0 +#include "lib/widget.h" /* message() */ +#endif + +#include "vfs.h" +#include "utilvfs.h" +#include "xdirentry.h" +#include "gc.h" /* vfs_rmstamp */ + +/*** global variables ****************************************************************************/ + +/*** file scope macro definitions ****************************************************************/ + +#define CALL(x) \ + if (VFS_SUBCLASS (me)->x != NULL) \ + VFS_SUBCLASS (me)->x + +/*** file scope type declarations ****************************************************************/ + +struct dirhandle +{ + GList *cur; + struct vfs_s_inode *dir; +}; + +/*** file scope variables ************************************************************************/ + +/* --------------------------------------------------------------------------------------------- */ +/*** file scope functions ************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +/* We were asked to create entries automagically */ + +static struct vfs_s_entry * +vfs_s_automake (struct vfs_class *me, struct vfs_s_inode *dir, char *path, int flags) +{ + struct vfs_s_entry *res; + char *sep; + + sep = strchr (path, PATH_SEP); + if (sep != NULL) + *sep = '\0'; + + res = vfs_s_generate_entry (me, path, dir, (flags & FL_MKDIR) != 0 ? (0777 | S_IFDIR) : 0777); + vfs_s_insert_entry (me, dir, res); + + if (sep != NULL) + *sep = PATH_SEP; + + return res; +} + +/* --------------------------------------------------------------------------------------------- */ +/* If the entry is a symlink, find the entry for its target */ + +static struct vfs_s_entry * +vfs_s_resolve_symlink (struct vfs_class *me, struct vfs_s_entry *entry, int follow) +{ + char *linkname; + char *fullname = NULL; + struct vfs_s_entry *target; + + if (follow == LINK_NO_FOLLOW) + return entry; + if (follow == 0) + ERRNOR (ELOOP, NULL); + if (entry == NULL) + ERRNOR (ENOENT, NULL); + if (!S_ISLNK (entry->ino->st.st_mode)) + return entry; + + linkname = entry->ino->linkname; + if (linkname == NULL) + ERRNOR (EFAULT, NULL); + + /* make full path from relative */ + if (!IS_PATH_SEP (*linkname)) + { + char *fullpath; + + fullpath = vfs_s_fullpath (me, entry->dir); + if (fullpath != NULL) + { + fullname = g_strconcat (fullpath, PATH_SEP_STR, linkname, (char *) NULL); + linkname = fullname; + g_free (fullpath); + } + } + + target = + VFS_SUBCLASS (me)->find_entry (me, entry->dir->super->root, linkname, follow - 1, FL_NONE); + g_free (fullname); + return target; +} + +/* --------------------------------------------------------------------------------------------- */ +/* + * Follow > 0: follow links, serves as loop protect, + * == -1: do not follow links + */ + +static struct vfs_s_entry * +vfs_s_find_entry_tree (struct vfs_class *me, struct vfs_s_inode *root, + const char *a_path, int follow, int flags) +{ + size_t pseg; + struct vfs_s_entry *ent = NULL; + char *const pathref = g_strdup (a_path); + char *path = pathref; + + /* canonicalize as well, but don't remove '../' from path */ + canonicalize_pathname_custom (path, CANON_PATH_ALL & (~CANON_PATH_REMDOUBLEDOTS)); + + while (root != NULL) + { + GList *iter; + + while (IS_PATH_SEP (*path)) /* Strip leading '/' */ + path++; + + if (path[0] == '\0') + { + g_free (pathref); + return ent; + } + + for (pseg = 0; path[pseg] != '\0' && !IS_PATH_SEP (path[pseg]); pseg++) + ; + + for (iter = g_queue_peek_head_link (root->subdir); iter != NULL; iter = g_list_next (iter)) + { + ent = VFS_ENTRY (iter->data); + if (strlen (ent->name) == pseg && strncmp (ent->name, path, pseg) == 0) + /* FOUND! */ + break; + } + + ent = iter != NULL ? VFS_ENTRY (iter->data) : NULL; + + if (ent == NULL && (flags & (FL_MKFILE | FL_MKDIR)) != 0) + ent = vfs_s_automake (me, root, path, flags); + if (ent == NULL) + { + me->verrno = ENOENT; + goto cleanup; + } + + path += pseg; + /* here we must follow leading directories always; + only the actual file is optional */ + ent = vfs_s_resolve_symlink (me, ent, + strchr (path, PATH_SEP) != NULL ? LINK_FOLLOW : follow); + if (ent == NULL) + goto cleanup; + root = ent->ino; + } + cleanup: + g_free (pathref); + return NULL; +} + +/* --------------------------------------------------------------------------------------------- */ + +static struct vfs_s_entry * +vfs_s_find_entry_linear (struct vfs_class *me, struct vfs_s_inode *root, + const char *a_path, int follow, int flags) +{ + struct vfs_s_entry *ent = NULL; + char *const path = g_strdup (a_path); + GList *iter; + + if (root->super->root != root) + vfs_die ("We have to use _real_ root. Always. Sorry."); + + /* canonicalize as well, but don't remove '../' from path */ + canonicalize_pathname_custom (path, CANON_PATH_ALL & (~CANON_PATH_REMDOUBLEDOTS)); + + if ((flags & FL_DIR) == 0) + { + char *dirname, *name; + struct vfs_s_inode *ino; + + dirname = g_path_get_dirname (path); + name = g_path_get_basename (path); + ino = vfs_s_find_inode (me, root->super, dirname, follow, flags | FL_DIR); + ent = vfs_s_find_entry_tree (me, ino, name, follow, flags); + g_free (dirname); + g_free (name); + g_free (path); + return ent; + } + + iter = g_queue_find_custom (root->subdir, path, (GCompareFunc) vfs_s_entry_compare); + ent = iter != NULL ? VFS_ENTRY (iter->data) : NULL; + + if (ent != NULL && !VFS_SUBCLASS (me)->dir_uptodate (me, ent->ino)) + { +#if 1 + vfs_print_message (_("Directory cache expired for %s"), path); +#endif + vfs_s_free_entry (me, ent); + ent = NULL; + } + + if (ent == NULL) + { + struct 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 (VFS_SUBCLASS (me)->dir_load (me, ino, path) == -1) + { + vfs_s_free_entry (me, ent); + g_free (path); + return NULL; + } + + vfs_s_insert_entry (me, root, ent); + + iter = g_queue_find_custom (root->subdir, path, (GCompareFunc) vfs_s_entry_compare); + ent = iter != NULL ? VFS_ENTRY (iter->data) : NULL; + } + if (ent == NULL) + vfs_die ("find_linear: success but directory is not there\n"); + +#if 0 + if (vfs_s_resolve_symlink (me, ent, follow) == NULL) + { + g_free (path); + return NULL; + } +#endif + g_free (path); + return ent; +} + +/* --------------------------------------------------------------------------------------------- */ +/* Ook, these were functions around directory entries / inodes */ +/* -------------------------------- superblock games -------------------------- */ + +static struct vfs_s_super * +vfs_s_new_super (struct vfs_class *me) +{ + struct vfs_s_super *super; + + super = g_new0 (struct vfs_s_super, 1); + super->me = me; + return super; +} + +/* --------------------------------------------------------------------------------------------- */ + +static inline void +vfs_s_insert_super (struct vfs_class *me, struct vfs_s_super *super) +{ + VFS_SUBCLASS (me)->supers = g_list_prepend (VFS_SUBCLASS (me)->supers, super); +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +vfs_s_free_super (struct vfs_class *me, struct vfs_s_super *super) +{ + if (super->root != NULL) + { + 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 != 0) + message (D_ERROR, "Direntry warning", + "Super ino_usage is %d, memory leak", super->ino_usage); + + if (super->want_stale) + message (D_ERROR, "Direntry warning", "%s", "Super has want_stale set"); +#endif + + VFS_SUBCLASS (me)->supers = g_list_remove (VFS_SUBCLASS (me)->supers, super); + + CALL (free_archive) (me, super); +#ifdef ENABLE_VFS_NET + vfs_path_element_free (super->path_element); +#endif + g_free (super->name); + g_free (super); +} + +/* --------------------------------------------------------------------------------------------- */ + +static vfs_file_handler_t * +vfs_s_new_fh (struct vfs_s_inode *ino, gboolean changed) +{ + vfs_file_handler_t *fh; + + fh = g_new0 (vfs_file_handler_t, 1); + vfs_s_init_fh (fh, ino, changed); + + return fh; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +vfs_s_free_fh (struct vfs_s_subclass *s, vfs_file_handler_t * fh) +{ + if (s->fh_free != NULL) + s->fh_free (fh); + + g_free (fh); +} + +/* --------------------------------------------------------------------------------------------- */ +/* Support of archives */ +/* ------------------------ readdir & friends ----------------------------- */ + +static struct vfs_s_inode * +vfs_s_inode_from_path (const vfs_path_t * vpath, int flags) +{ + struct vfs_s_super *super; + struct vfs_s_inode *ino; + const char *q; + const vfs_path_element_t *path_element; + + q = vfs_s_get_path (vpath, &super, 0); + if (q == NULL) + return NULL; + + path_element = vfs_path_get_by_index (vpath, -1); + + ino = + vfs_s_find_inode (path_element->class, super, q, + (flags & FL_FOLLOW) != 0 ? LINK_FOLLOW : LINK_NO_FOLLOW, + flags & ~FL_FOLLOW); + if (ino == NULL && *q == '\0') + /* We are asking about / directory of ftp server: assume it exists */ + ino = + vfs_s_find_inode (path_element->class, super, q, + (flags & FL_FOLLOW) != 0 ? LINK_FOLLOW : LINK_NO_FOLLOW, + FL_DIR | (flags & ~FL_FOLLOW)); + return ino; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void * +vfs_s_opendir (const vfs_path_t * vpath) +{ + struct vfs_s_inode *dir; + struct dirhandle *info; + const vfs_path_element_t *path_element; + + dir = vfs_s_inode_from_path (vpath, FL_DIR | FL_FOLLOW); + if (dir == NULL) + return NULL; + + path_element = vfs_path_get_by_index (vpath, -1); + + if (!S_ISDIR (dir->st.st_mode)) + { + path_element->class->verrno = ENOTDIR; + return NULL; + } + + dir->st.st_nlink++; +#if 0 + if (dir->subdir == NULL) /* This can actually happen if we allow empty directories */ + { + path_element->class->verrno = EAGAIN; + return NULL; + } +#endif + info = g_new (struct dirhandle, 1); + info->cur = g_queue_peek_head_link (dir->subdir); + info->dir = dir; + + return info; +} + +/* --------------------------------------------------------------------------------------------- */ + +static struct vfs_dirent * +vfs_s_readdir (void *data) +{ + struct vfs_dirent *dir = NULL; + struct dirhandle *info = (struct dirhandle *) data; + const char *name; + + if (info->cur == NULL || info->cur->data == NULL) + return NULL; + + name = VFS_ENTRY (info->cur->data)->name; + if (name != NULL) + dir = vfs_dirent_init (NULL, name, 0); + else + vfs_die ("Null in structure-cannot happen"); + + info->cur = g_list_next (info->cur); + + return dir; +} + +/* --------------------------------------------------------------------------------------------- */ + +static 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; +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +vfs_s_chdir (const vfs_path_t * vpath) +{ + void *data; + + data = vfs_s_opendir (vpath); + if (data == NULL) + return (-1); + vfs_s_closedir (data); + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ +/* --------------------------- stat and friends ---------------------------- */ + +static int +vfs_s_internal_stat (const vfs_path_t * vpath, struct stat *buf, int flag) +{ + struct vfs_s_inode *ino; + + ino = vfs_s_inode_from_path (vpath, flag); + if (ino == NULL) + return (-1); + *buf = ino->st; + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +vfs_s_readlink (const vfs_path_t * vpath, char *buf, size_t size) +{ + struct vfs_s_inode *ino; + size_t len; + const vfs_path_element_t *path_element; + + ino = vfs_s_inode_from_path (vpath, 0); + if (ino == NULL) + return (-1); + + path_element = vfs_path_get_by_index (vpath, -1); + + if (!S_ISLNK (ino->st.st_mode)) + { + path_element->class->verrno = EINVAL; + return (-1); + } + + if (ino->linkname == NULL) + { + path_element->class->verrno = EFAULT; + return (-1); + } + + len = strlen (ino->linkname); + if (size < len) + len = size; + /* readlink() does not append a NUL character to buf */ + memcpy (buf, ino->linkname, len); + return len; +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +vfs_s_read (void *fh, char *buffer, size_t count) +{ + vfs_file_handler_t *file = VFS_FILE_HANDLER (fh); + struct vfs_class *me = VFS_FILE_HANDLER_SUPER (fh)->me; + + if (file->linear == LS_LINEAR_PREOPEN) + { + if (VFS_SUBCLASS (me)->linear_start (me, file, file->pos) == 0) + return (-1); + } + + if (file->linear == LS_LINEAR_CLOSED) + vfs_die ("linear_start() did not set linear_state!"); + + if (file->linear == LS_LINEAR_OPEN) + return VFS_SUBCLASS (me)->linear_read (me, file, buffer, count); + + if (file->handle != -1) + { + ssize_t n; + + n = read (file->handle, buffer, count); + if (n < 0) + me->verrno = errno; + return n; + } + vfs_die ("vfs_s_read: This should not happen\n"); + return (-1); +} + +/* --------------------------------------------------------------------------------------------- */ + +static ssize_t +vfs_s_write (void *fh, const char *buffer, size_t count) +{ + vfs_file_handler_t *file = VFS_FILE_HANDLER (fh); + struct vfs_class *me = VFS_FILE_HANDLER_SUPER (fh)->me; + + if (file->linear != LS_NOT_LINEAR) + vfs_die ("no writing to linear files, please"); + + file->changed = TRUE; + if (file->handle != -1) + { + ssize_t n; + + n = write (file->handle, buffer, count); + if (n < 0) + me->verrno = errno; + return n; + } + vfs_die ("vfs_s_write: This should not happen\n"); + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ + +static off_t +vfs_s_lseek (void *fh, off_t offset, int whence) +{ + vfs_file_handler_t *file = VFS_FILE_HANDLER (fh); + off_t size = file->ino->st.st_size; + + if (file->linear == LS_LINEAR_OPEN) + vfs_die ("cannot lseek() after linear_read!"); + + if (file->handle != -1) + { /* If we have local file opened, we want to work with it */ + off_t retval; + + retval = lseek (file->handle, offset, whence); + if (retval == -1) + VFS_FILE_HANDLER_SUPER (fh)->me->verrno = errno; + return retval; + } + + switch (whence) + { + case SEEK_CUR: + offset += file->pos; + break; + case SEEK_END: + offset += size; + break; + default: + break; + } + if (offset < 0) + file->pos = 0; + else if (offset < size) + file->pos = offset; + else + file->pos = size; + return file->pos; +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +vfs_s_close (void *fh) +{ + vfs_file_handler_t *file = VFS_FILE_HANDLER (fh); + struct vfs_s_super *super = VFS_FILE_HANDLER_SUPER (fh); + struct vfs_class *me = super->me; + struct vfs_s_subclass *sub = VFS_SUBCLASS (me); + int res = 0; + + if (me == NULL) + return (-1); + + super->fd_usage--; + if (super->fd_usage == 0) + vfs_stamp_create (me, VFS_FILE_HANDLER_SUPER (fh)); + + if (file->linear == LS_LINEAR_OPEN) + sub->linear_close (me, fh); + if (sub->fh_close != NULL) + res = sub->fh_close (me, fh); + if ((me->flags & VFSF_USETMP) != 0 && file->changed && sub->file_store != NULL) + { + char *s; + + s = vfs_s_fullpath (me, file->ino); + + if (s == NULL) + res = -1; + else + { + res = sub->file_store (me, fh, s, file->ino->localname); + g_free (s); + } + vfs_s_invalidate (me, super); + } + + if (file->handle != -1) + { + close (file->handle); + file->handle = -1; + } + + vfs_s_free_inode (me, file->ino); + vfs_s_free_fh (sub, fh); + + return res; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +vfs_s_print_stats (const char *fs_name, const char *action, + const char *file_name, off_t have, off_t need) +{ + if (need != 0) + vfs_print_message (_("%s: %s: %s %3d%% (%lld) bytes transferred"), fs_name, action, + file_name, (int) ((double) have * 100 / need), (long long) have); + else + vfs_print_message (_("%s: %s: %s %lld bytes transferred"), fs_name, action, file_name, + (long long) have); +} + +/* --------------------------------------------------------------------------------------------- */ +/* ------------------------------- mc support ---------------------------- */ + +static void +vfs_s_fill_names (struct vfs_class *me, fill_names_f func) +{ + GList *iter; + + for (iter = VFS_SUBCLASS (me)->supers; iter != NULL; iter = g_list_next (iter)) + { + const struct vfs_s_super *super = (const struct vfs_s_super *) iter->data; + char *name; + + name = g_strconcat (super->name, PATH_SEP_STR, me->prefix, VFS_PATH_URL_DELIMITER, + /* super->current_dir->name, */ (char *) NULL); + func (name); + g_free (name); + } +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +vfs_s_ferrno (struct vfs_class *me) +{ + return me->verrno; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Get local copy of the given file. We reuse the existing file cache + * for remote filesystems. Archives use standard VFS facilities. + */ + +static vfs_path_t * +vfs_s_getlocalcopy (const vfs_path_t * vpath) +{ + vfs_file_handler_t *fh; + vfs_path_t *local = NULL; + + if (vpath == NULL) + return NULL; + + fh = vfs_s_open (vpath, O_RDONLY, 0); + + if (fh != NULL) + { + const struct vfs_class *me; + + me = vfs_path_get_by_index (vpath, -1)->class; + if ((me->flags & VFSF_USETMP) != 0 && fh->ino != NULL) + local = vfs_path_from_str_flags (fh->ino->localname, VPF_NO_CANON); + + vfs_s_close (fh); + } + + return local; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Return the local copy. Since we are using our cache, we do nothing - + * the cache will be removed when the archive is closed. + */ + +static int +vfs_s_ungetlocalcopy (const vfs_path_t * vpath, const vfs_path_t * local, gboolean has_changed) +{ + (void) vpath; + (void) local; + (void) has_changed; + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ + +static int +vfs_s_setctl (const vfs_path_t * vpath, int ctlop, void *arg) +{ + const vfs_path_element_t *path_element; + + path_element = vfs_path_get_by_index (vpath, -1); + + switch (ctlop) + { + case VFS_SETCTL_STALE_DATA: + { + struct vfs_s_inode *ino; + + ino = vfs_s_inode_from_path (vpath, 0); + if (ino == NULL) + return 0; + if (arg != NULL) + ino->super->want_stale = TRUE; + else + { + ino->super->want_stale = FALSE; + vfs_s_invalidate (path_element->class, ino->super); + } + return 1; + } + case VFS_SETCTL_LOGFILE: + path_element->class->logfile = fopen ((char *) arg, "w"); + return 1; + case VFS_SETCTL_FLUSH: + path_element->class->flush = TRUE; + return 1; + default: + return 0; + } +} + +/* --------------------------------------------------------------------------------------------- */ +/* ----------------------------- Stamping support -------------------------- */ + +static vfsid +vfs_s_getid (const vfs_path_t * vpath) +{ + struct vfs_s_super *archive = NULL; + const char *p; + + p = vfs_s_get_path (vpath, &archive, FL_NO_OPEN); + if (p == NULL) + return NULL; + + return (vfsid) archive; +} + +/* --------------------------------------------------------------------------------------------- */ + +static gboolean +vfs_s_nothingisopen (vfsid id) +{ + return (VFS_SUPER (id)->fd_usage <= 0); +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +vfs_s_free (vfsid id) +{ + vfs_s_free_super (VFS_SUPER (id)->me, VFS_SUPER (id)); +} + +/* --------------------------------------------------------------------------------------------- */ + +static gboolean +vfs_s_dir_uptodate (struct vfs_class *me, struct vfs_s_inode *ino) +{ + gint64 tim; + + if (me->flush) + { + me->flush = FALSE; + return 0; + } + + tim = g_get_monotonic_time (); + + return (tim < ino->timestamp); +} + +/* --------------------------------------------------------------------------------------------- */ +/*** public functions ****************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +struct vfs_s_inode * +vfs_s_new_inode (struct vfs_class *me, struct vfs_s_super *super, struct stat *initstat) +{ + struct vfs_s_inode *ino; + + ino = g_try_new0 (struct vfs_s_inode, 1); + if (ino == NULL) + return NULL; + + if (initstat != NULL) + ino->st = *initstat; + ino->super = super; + ino->subdir = g_queue_new (); + ino->st.st_nlink = 0; + ino->st.st_ino = VFS_SUBCLASS (me)->inode_counter++; + ino->st.st_dev = VFS_SUBCLASS (me)->rdev; + + super->ino_usage++; + + CALL (init_inode) (me, ino); + + return ino; +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_s_free_inode (struct vfs_class *me, struct vfs_s_inode *ino) +{ + if (ino == NULL) + vfs_die ("Don't pass NULL to me"); + + /* ==0 can happen if freshly created entry is deleted */ + if (ino->st.st_nlink > 1) + { + ino->st.st_nlink--; + return; + } + + while (g_queue_get_length (ino->subdir) != 0) + { + struct vfs_s_entry *entry; + + entry = VFS_ENTRY (g_queue_peek_head (ino->subdir)); + vfs_s_free_entry (me, entry); + } + + g_queue_free (ino->subdir); + ino->subdir = NULL; + + CALL (free_inode) (me, ino); + g_free (ino->linkname); + if ((me->flags & VFSF_USETMP) != 0 && ino->localname != NULL) + { + unlink (ino->localname); + g_free (ino->localname); + } + ino->super->ino_usage--; + g_free (ino); +} + +/* --------------------------------------------------------------------------------------------- */ + +struct vfs_s_entry * +vfs_s_new_entry (struct vfs_class *me, const char *name, struct vfs_s_inode *inode) +{ + struct vfs_s_entry *entry; + + entry = g_new0 (struct vfs_s_entry, 1); + + entry->name = g_strdup (name); + entry->ino = inode; + entry->ino->ent = entry; + CALL (init_entry) (me, entry); + + return entry; +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_s_free_entry (struct vfs_class *me, struct vfs_s_entry *ent) +{ + if (ent->dir != NULL) + g_queue_remove (ent->dir->subdir, ent); + + MC_PTR_FREE (ent->name); + + if (ent->ino != NULL) + { + ent->ino->ent = NULL; + vfs_s_free_inode (me, ent->ino); + } + + g_free (ent); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_s_insert_entry (struct vfs_class *me, struct vfs_s_inode *dir, struct vfs_s_entry *ent) +{ + (void) me; + + ent->dir = dir; + + ent->ino->st.st_nlink++; + g_queue_push_tail (dir->subdir, ent); +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_entry_compare (const void *a, const void *b) +{ + const struct vfs_s_entry *e = (const struct vfs_s_entry *) a; + const char *name = (const char *) b; + + return strcmp (e->name, name); +} + +/* --------------------------------------------------------------------------------------------- */ + +struct stat * +vfs_s_default_stat (struct vfs_class *me, mode_t mode) +{ + static struct stat st; + mode_t myumask; + + (void) me; + + myumask = umask (022); + umask (myumask); + mode &= ~myumask; + + st.st_mode = mode; + st.st_ino = 0; + st.st_dev = 0; +#ifdef HAVE_STRUCT_STAT_ST_RDEV + st.st_rdev = 0; +#endif + st.st_uid = getuid (); + st.st_gid = getgid (); +#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE + st.st_blksize = 512; +#endif + st.st_size = 0; + + st.st_mtime = st.st_atime = st.st_ctime = time (NULL); +#ifdef HAVE_STRUCT_STAT_ST_MTIM + st.st_atim.tv_nsec = st.st_mtim.tv_nsec = st.st_ctim.tv_nsec = 0; +#endif + + vfs_adjust_stat (&st); + + return &st; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Calculate number of st_blocks using st_size and st_blksize. + * In according to stat(2), st_blocks is the size in 512-byte units. + * + * @param s stat info + */ + +void +vfs_adjust_stat (struct stat *s) +{ +#ifdef HAVE_STRUCT_STAT_ST_BLOCKS + if (s->st_size == 0) + s->st_blocks = 0; + else + { +#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE + blkcnt_t ioblocks; + blksize_t ioblock_size; + + /* 1. Calculate how many IO blocks are occupied */ + ioblocks = 1 + (s->st_size - 1) / s->st_blksize; + /* 2. Calculate size of st_blksize in 512-byte units */ + ioblock_size = 1 + (s->st_blksize - 1) / 512; + /* 3. Calculate number of blocks */ + s->st_blocks = ioblocks * ioblock_size; +#else + /* Let IO block size is 512 bytes */ + s->st_blocks = 1 + (s->st_size - 1) / 512; +#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */ + } +#endif /* HAVE_STRUCT_STAT_ST_BLOCKS */ +} + +/* --------------------------------------------------------------------------------------------- */ + +struct vfs_s_entry * +vfs_s_generate_entry (struct vfs_class *me, const 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); + + return vfs_s_new_entry (me, name, inode); +} + +/* --------------------------------------------------------------------------------------------- */ + +struct vfs_s_inode * +vfs_s_find_inode (struct vfs_class *me, const struct vfs_s_super *super, + const char *path, int follow, int flags) +{ + struct vfs_s_entry *ent; + + if (((me->flags & VFSF_REMOTE) == 0) && (*path == '\0')) + return super->root; + + ent = VFS_SUBCLASS (me)->find_entry (me, super->root, path, follow, flags); + return (ent != NULL ? ent->ino : NULL); +} + +/* --------------------------------------------------------------------------------------------- */ +/* Ook, these were functions around directory entries / inodes */ +/* -------------------------------- superblock games -------------------------- */ +/** + * get superlock object by vpath + * + * @param vpath path + * @return superlock object or NULL if not found + */ + +struct vfs_s_super * +vfs_get_super_by_vpath (const vfs_path_t * vpath) +{ + GList *iter; + void *cookie = NULL; + const vfs_path_element_t *path_element; + struct vfs_s_subclass *subclass; + struct vfs_s_super *super = NULL; + vfs_path_t *vpath_archive; + + path_element = vfs_path_get_by_index (vpath, -1); + subclass = VFS_SUBCLASS (path_element->class); + + vpath_archive = vfs_path_clone (vpath); + vfs_path_remove_element_by_index (vpath_archive, -1); + + if (subclass->archive_check != NULL) + { + cookie = subclass->archive_check (vpath_archive); + if (cookie == NULL) + goto ret; + } + + if (subclass->archive_same == NULL) + goto ret; + + for (iter = subclass->supers; iter != NULL; iter = g_list_next (iter)) + { + int i; + + super = VFS_SUPER (iter->data); + + /* 0 == other, 1 == same, return it, 2 == other but stop scanning */ + i = subclass->archive_same (path_element, super, vpath_archive, cookie); + if (i == 1) + goto ret; + if (i != 0) + break; + + super = NULL; + } + + ret: + vfs_path_free (vpath_archive, TRUE); + return super; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * get path from last VFS-element and create corresponding superblock + * + * @param vpath source path object + * @param archive pointer to object for store newly created superblock + * @param flags flags + * + * @return path from last VFS-element + */ +const char * +vfs_s_get_path (const vfs_path_t * vpath, struct vfs_s_super **archive, int flags) +{ + const char *retval = ""; + int result = -1; + struct vfs_s_super *super; + const vfs_path_element_t *path_element; + struct vfs_s_subclass *subclass; + + path_element = vfs_path_get_by_index (vpath, -1); + + if (path_element->path != NULL) + retval = path_element->path; + + super = vfs_get_super_by_vpath (vpath); + if (super != NULL) + goto return_success; + + if ((flags & FL_NO_OPEN) != 0) + { + path_element->class->verrno = EIO; + return NULL; + } + + subclass = VFS_SUBCLASS (path_element->class); + + super = subclass->new_archive != NULL ? + subclass->new_archive (path_element->class) : vfs_s_new_super (path_element->class); + + if (subclass->open_archive != NULL) + { + vfs_path_t *vpath_archive; + + vpath_archive = vfs_path_clone (vpath); + vfs_path_remove_element_by_index (vpath_archive, -1); + + result = subclass->open_archive (super, vpath_archive, path_element); + vfs_path_free (vpath_archive, TRUE); + } + if (result == -1) + { + vfs_s_free_super (path_element->class, super); + path_element->class->verrno = EIO; + return NULL; + } + if (super->name == NULL) + vfs_die ("You have to fill name\n"); + if (super->root == NULL) + vfs_die ("You have to fill root inode\n"); + + vfs_s_insert_super (path_element->class, super); + vfs_stamp_create (path_element->class, super); + + return_success: + *archive = super; + return retval; +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_s_invalidate (struct vfs_class *me, struct 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 (struct vfs_class *me, struct vfs_s_inode *ino) +{ + if (ino->ent == NULL) + ERRNOR (EAGAIN, NULL); + + if ((me->flags & VFSF_USETMP) == 0) + { + /* archives */ + char *path; + + path = g_strdup (ino->ent->name); + + while (TRUE) + { + char *newpath; + + ino = ino->ent->dir; + if (ino == ino->super->root) + break; + + newpath = g_strconcat (ino->ent->name, PATH_SEP_STR, path, (char *) NULL); + g_free (path); + path = newpath; + } + return path; + } + + /* remote systems */ + if (ino->ent->dir == NULL || ino->ent->dir->ent == NULL) + return g_strdup (ino->ent->name); + + return g_strconcat (ino->ent->dir->ent->name, PATH_SEP_STR, ino->ent->name, (char *) NULL); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_s_init_fh (vfs_file_handler_t * fh, struct vfs_s_inode *ino, gboolean changed) +{ + fh->ino = ino; + fh->handle = -1; + fh->changed = changed; + fh->linear = LS_NOT_LINEAR; +} + +/* --------------------------------------------------------------------------------------------- */ +/* --------------------------- stat and friends ---------------------------- */ + +void * +vfs_s_open (const vfs_path_t * vpath, int flags, mode_t mode) +{ + gboolean was_changed = FALSE; + vfs_file_handler_t *fh; + struct vfs_s_super *super; + const char *q; + struct vfs_s_inode *ino; + const vfs_path_element_t *path_element; + struct vfs_s_subclass *s; + + q = vfs_s_get_path (vpath, &super, 0); + if (q == NULL) + return NULL; + + path_element = vfs_path_get_by_index (vpath, -1); + + ino = vfs_s_find_inode (path_element->class, super, q, LINK_FOLLOW, FL_NONE); + if (ino != NULL && (flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) + { + path_element->class->verrno = EEXIST; + return NULL; + } + + s = VFS_SUBCLASS (path_element->class); + + if (ino == NULL) + { + char *dirname, *name; + struct vfs_s_entry *ent; + struct vfs_s_inode *dir; + + /* If the filesystem is read-only, disable file creation */ + if ((flags & O_CREAT) == 0 || path_element->class->write == NULL) + return NULL; + + dirname = g_path_get_dirname (q); + dir = vfs_s_find_inode (path_element->class, super, dirname, LINK_FOLLOW, FL_DIR); + g_free (dirname); + if (dir == NULL) + return NULL; + + name = g_path_get_basename (q); + ent = vfs_s_generate_entry (path_element->class, name, dir, 0755); + ino = ent->ino; + vfs_s_insert_entry (path_element->class, dir, ent); + if ((VFS_CLASS (s)->flags & VFSF_USETMP) != 0) + { + int tmp_handle; + vfs_path_t *tmp_vpath; + + tmp_handle = vfs_mkstemps (&tmp_vpath, path_element->class->name, name); + ino->localname = vfs_path_free (tmp_vpath, FALSE); + if (tmp_handle == -1) + { + g_free (name); + return NULL; + } + + close (tmp_handle); + } + + g_free (name); + was_changed = TRUE; + } + + if (S_ISDIR (ino->st.st_mode)) + { + path_element->class->verrno = EISDIR; + return NULL; + } + + fh = s->fh_new != NULL ? s->fh_new (ino, was_changed) : vfs_s_new_fh (ino, was_changed); + + if (IS_LINEAR (flags)) + { + if (s->linear_start != NULL) + { + vfs_print_message ("%s", _("Starting linear transfer...")); + fh->linear = LS_LINEAR_PREOPEN; + } + } + else + { + if (s->fh_open != NULL && s->fh_open (path_element->class, fh, flags, mode) != 0) + { + vfs_s_free_fh (s, fh); + return NULL; + } + } + + if ((VFS_CLASS (s)->flags & VFSF_USETMP) != 0 && fh->ino->localname != NULL) + { + fh->handle = open (fh->ino->localname, NO_LINEAR (flags), mode); + if (fh->handle == -1) + { + vfs_s_free_fh (s, fh); + path_element->class->verrno = errno; + return NULL; + } + } + + /* i.e. we had no open files and now we have one */ + vfs_rmstamp (path_element->class, (vfsid) super); + super->fd_usage++; + fh->ino->st.st_nlink++; + return fh; +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_stat (const vfs_path_t * vpath, struct stat *buf) +{ + return vfs_s_internal_stat (vpath, buf, FL_FOLLOW); +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_lstat (const vfs_path_t * vpath, struct stat *buf) +{ + return vfs_s_internal_stat (vpath, buf, FL_NONE); +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_fstat (void *fh, struct stat *buf) +{ + *buf = VFS_FILE_HANDLER (fh)->ino->st; + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_retrieve_file (struct vfs_class *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; + ssize_t n; + off_t stat_size = ino->st.st_size; + vfs_file_handler_t *fh = NULL; + vfs_path_t *tmp_vpath; + struct vfs_s_subclass *s = VFS_SUBCLASS (me); + + if ((me->flags & VFSF_USETMP) == 0) + return (-1); + + handle = vfs_mkstemps (&tmp_vpath, me->name, ino->ent->name); + ino->localname = vfs_path_free (tmp_vpath, FALSE); + if (handle == -1) + { + me->verrno = errno; + goto error_4; + } + + fh = s->fh_new != NULL ? s->fh_new (ino, FALSE) : vfs_s_new_fh (ino, FALSE); + + if (s->linear_start (me, fh, 0) == 0) + goto error_3; + + /* Clear the interrupt status */ + tty_got_interrupt (); + tty_enable_interrupt_key (); + + while ((n = s->linear_read (me, fh, buffer, sizeof (buffer))) != 0) + { + int t; + + if (n < 0) + goto error_1; + + total += n; + vfs_s_print_stats (me->name, _("Getting file"), ino->ent->name, total, stat_size); + + if (tty_got_interrupt ()) + goto error_1; + + t = write (handle, buffer, n); + if (t != n) + { + if (t == -1) + me->verrno = errno; + goto error_1; + } + } + s->linear_close (me, fh); + close (handle); + + tty_disable_interrupt_key (); + vfs_s_free_fh (s, fh); + return 0; + + error_1: + s->linear_close (me, fh); + error_3: + tty_disable_interrupt_key (); + close (handle); + unlink (ino->localname); + error_4: + MC_PTR_FREE (ino->localname); + if (fh != NULL) + vfs_s_free_fh (s, fh); + return (-1); +} + +/* --------------------------------------------------------------------------------------------- */ +/* ----------------------------- Stamping support -------------------------- */ + +/* Initialize one of our subclasses - fill common functions */ +void +vfs_init_class (struct vfs_class *vclass, const char *name, vfs_flags_t flags, const char *prefix) +{ + memset (vclass, 0, sizeof (struct vfs_class)); + + vclass->name = name; + vclass->flags = flags; + vclass->prefix = prefix; + + vclass->fill_names = vfs_s_fill_names; + vclass->open = vfs_s_open; + vclass->close = vfs_s_close; + vclass->read = vfs_s_read; + if ((vclass->flags & VFSF_READONLY) == 0) + vclass->write = vfs_s_write; + vclass->opendir = vfs_s_opendir; + vclass->readdir = vfs_s_readdir; + vclass->closedir = vfs_s_closedir; + vclass->stat = vfs_s_stat; + vclass->lstat = vfs_s_lstat; + vclass->fstat = vfs_s_fstat; + vclass->readlink = vfs_s_readlink; + vclass->chdir = vfs_s_chdir; + vclass->ferrno = vfs_s_ferrno; + vclass->lseek = vfs_s_lseek; + vclass->getid = vfs_s_getid; + vclass->nothingisopen = vfs_s_nothingisopen; + vclass->free = vfs_s_free; + vclass->setctl = vfs_s_setctl; + if ((vclass->flags & VFSF_USETMP) != 0) + { + vclass->getlocalcopy = vfs_s_getlocalcopy; + vclass->ungetlocalcopy = vfs_s_ungetlocalcopy; + } +} + +/* --------------------------------------------------------------------------------------------- */ + +void +vfs_init_subclass (struct vfs_s_subclass *sub, const char *name, vfs_flags_t flags, + const char *prefix) +{ + struct vfs_class *vclass = VFS_CLASS (sub); + size_t len; + char *start; + + vfs_init_class (vclass, name, flags, prefix); + + len = sizeof (struct vfs_s_subclass) - sizeof (struct vfs_class); + start = (char *) sub + sizeof (struct vfs_class); + memset (start, 0, len); + + if ((vclass->flags & VFSF_USETMP) != 0) + sub->find_entry = vfs_s_find_entry_linear; + else if ((vclass->flags & VFSF_REMOTE) != 0) + sub->find_entry = vfs_s_find_entry_linear; + else + sub->find_entry = vfs_s_find_entry_tree; + sub->dir_uptodate = vfs_s_dir_uptodate; +} + +/* --------------------------------------------------------------------------------------------- */ +/** Find VFS id for given directory name */ + +vfsid +vfs_getid (const vfs_path_t * vpath) +{ + const vfs_path_element_t *path_element; + + path_element = vfs_path_get_by_index (vpath, -1); + if (!vfs_path_element_valid (path_element) || path_element->class->getid == NULL) + return NULL; + + return (*path_element->class->getid) (vpath); +} + +/* --------------------------------------------------------------------------------------------- */ +/* ----------- Utility functions for networked filesystems -------------- */ + +#ifdef ENABLE_VFS_NET +int +vfs_s_select_on_two (int fd1, int fd2) +{ + fd_set set; + struct timeval time_out; + int v; + int maxfd = MAX (fd1, fd2) + 1; + + time_out.tv_sec = 1; + time_out.tv_usec = 0; + FD_ZERO (&set); + FD_SET (fd1, &set); + FD_SET (fd2, &set); + + v = select (maxfd, &set, 0, 0, &time_out); + 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 (struct vfs_class *me, int sock, char *buf, int buf_len, char term) +{ + FILE *logfile = me->logfile; + int i; + char c; + + for (i = 0; i < buf_len - 1; i++, buf++) + { + if (read (sock, buf, sizeof (char)) <= 0) + return 0; + + if (logfile != NULL) + { + size_t ret1; + int ret2; + + ret1 = fwrite (buf, 1, 1, logfile); + ret2 = fflush (logfile); + (void) ret1; + (void) ret2; + } + + if (*buf == term) + { + *buf = '\0'; + return 1; + } + } + + /* Line is too long - terminate buffer and discard the rest of line */ + *buf = '\0'; + while (read (sock, &c, sizeof (c)) > 0) + { + if (logfile != NULL) + { + size_t ret1; + int ret2; + + ret1 = fwrite (&c, 1, 1, logfile); + ret2 = fflush (logfile); + (void) ret1; + (void) ret2; + } + if (c == '\n') + return 1; + } + return 0; +} + +/* --------------------------------------------------------------------------------------------- */ + +int +vfs_s_get_line_interruptible (struct vfs_class *me, char *buffer, int size, int fd) +{ + int i; + int res = 0; + + (void) me; + + tty_enable_interrupt_key (); + + for (i = 0; i < size - 1; i++) + { + ssize_t n; + + n = read (fd, &buffer[i], 1); + if (n == -1 && errno == EINTR) + { + buffer[i] = '\0'; + res = EINTR; + goto ret; + } + if (n == 0) + { + buffer[i] = '\0'; + goto ret; + } + if (buffer[i] == '\n') + { + buffer[i] = '\0'; + res = 1; + goto ret; + } + } + + buffer[size - 1] = '\0'; + + ret: + tty_disable_interrupt_key (); + + return res; +} +#endif /* ENABLE_VFS_NET */ + +/* --------------------------------------------------------------------------------------------- */ +/** + * Normalize filenames start position + */ + +void +vfs_s_normalize_filename_leading_spaces (struct vfs_s_inode *root_inode, size_t final_num_spaces) +{ + GList *iter; + + for (iter = g_queue_peek_head_link (root_inode->subdir); iter != NULL; + iter = g_list_next (iter)) + { + struct vfs_s_entry *entry = VFS_ENTRY (iter->data); + + if ((size_t) entry->leading_spaces > final_num_spaces) + { + char *source_name, *spacer; + + source_name = entry->name; + spacer = g_strnfill ((size_t) entry->leading_spaces - final_num_spaces, ' '); + entry->name = g_strconcat (spacer, source_name, (char *) NULL); + g_free (spacer); + g_free (source_name); + } + + entry->leading_spaces = -1; + } +} + +/* --------------------------------------------------------------------------------------------- */ |