* Filesystem in Userspace. FUSE allows a filesystem to be implemented in a
* userspace process by implementing the filesystem primitives--- read(),
* write(), readdir(), etc.
- *
+ */
+
+/*
* Copyright (C) 2012 Eric Biggers
*
- * wimlib - Library for working with WIM files
+ * This file is part of wimlib, a library for working with WIM files.
*
- * This library is free software; you can redistribute it and/or modify it under
- * the terms of the GNU Lesser General Public License as published by the Free
- * Software Foundation; either version 2.1 of the License, or (at your option) any
- * later version.
+ * wimlib is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2.1 of the License, or (at your option)
+ * any later version.
*
- * This library 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 Lesser General Public License for more details.
+ * wimlib 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 Lesser General Public License for more
+ * details.
*
- * You should have received a copy of the GNU Lesser General Public License along
- * with this library; if not, write to the Free Software Foundation, Inc., 59
- * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with wimlib; if not, see http://www.gnu.org/licenses/.
*/
#include "wimlib_internal.h"
#ifdef WITH_FUSE
+#include "sha1.h"
#include "lookup_table.h"
#include "xml.h"
+#include "io.h"
+#include "timestamp.h"
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <ftw.h>
#include <mqueue.h>
+struct wimlib_fd {
+ int staging_fd;
+ u64 hard_link_group;
+ struct lookup_table_entry *lte;
+};
+
/* The WIMStruct for the mounted WIM. */
static WIMStruct *w;
static const char *mount_dir;
+static inline int get_lookup_flags()
+{
+ if (mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
+ return LOOKUP_FLAG_ADS_OK;
+ else
+ return 0;
+}
+
+static inline int flags_writable(int open_flags)
+{
+ return open_flags & (O_RDWR | O_WRONLY);
+}
+
+static int alloc_fd(struct lookup_table_entry *lte, struct wimlib_fd **fd_ret)
+{
+ struct wimlib_fd *fds, *fd;
+ if (lte->num_opened_fds == lte->num_allocated_fds) {
+ if (lte->num_allocated_fds > 0xffff - 8)
+ return -ENFILE;
+
+ fds = CALLOC(lte->num_allocated_fds + 8, sizeof(struct wimlib_fd));
+ if (!fds)
+ return -ENOMEM;
+ memcpy(fds, lte->fds,
+ lte->num_allocated_fds * sizeof(struct wimlib_fd));
+ FREE(lte->fds);
+ lte->fds = fds;
+ }
+ fd = lte->fds;
+ while (1) {
+ if (!fd->lte) {
+ fd->hard_link_group = 0;
+ fd->staging_fd = -1;
+ fd->lte = lte;
+ *fd_ret = fd;
+ return 0;
+ }
+ fd++;
+ }
+}
+
+static int close_fd(struct wimlib_fd *fd)
+{
+ struct lookup_table_entry *lte = fd->lte;
+ wimlib_assert(lte);
+ wimlib_assert(lte->num_opened_fds);
+
+ u16 idx = fd - lte->fds;
+ if (lte->staging_file_name && fd->staging_fd != -1)
+ if (close(fd->staging_fd) != 0)
+ return -errno;
+ if (--lte->num_opened_fds == 0 && lte->refcnt == 0)
+ free_lookup_table_entry(lte);
+ fd->lte = NULL;
+ return 0;
+}
+
/*
* Creates a randomly named staging directory and returns its name into the
* static variable staging_dir_name.
staging_dir_name = MALLOC(staging_dir_name_len + 1);
if (!staging_dir_name) {
- ERROR("Out of memory!\n");
+ ERROR("Out of memory");
return;
}
staging_dir_name[staging_dir_name_len] = '\0';
if (mkdir(staging_dir_name, 0700) != 0) {
- ERROR("Failed to create temporary directory `%s': %m\n",
- staging_dir_name);
+ ERROR_WITH_ERRNO("Failed to create temporary directory `%s'",
+ staging_dir_name);
FREE(staging_dir_name);
staging_dir_name = NULL;
}
*/
static inline int delete_staging_dir()
{
- return nftw(staging_dir_name, remove_file_or_directory, 10, FTW_DEPTH);
+ int ret;
+
+ ret = nftw(staging_dir_name, remove_file_or_directory,10, FTW_DEPTH);
+ staging_dir_name = NULL;
+ return ret;
}
/* Name and message queue descriptors for message queues between the filesystem
unmount_to_daemon_mq_name = strcat_dup(slash, mount_dir_basename,
prefix, u2d_suffix);
if (!unmount_to_daemon_mq_name) {
- ERROR("Out of memory!\n");
+ ERROR("Out of memory");
return WIMLIB_ERR_NOMEM;
}
daemon_to_unmount_mq_name = strcat_dup(slash, mount_dir_basename,
prefix, d2u_suffix);
if (!daemon_to_unmount_mq_name) {
- ERROR("Out of memory!\n");
+ ERROR("Out of memory");
ret = WIMLIB_ERR_NOMEM;
goto err1;
}
0700, NULL);
if (unmount_to_daemon_mq == -1) {
- ERROR("mq_open(): %m\n");
+ ERROR_WITH_ERRNO("mq_open()");
ret = WIMLIB_ERR_MQUEUE;
goto err2;
}
0700, NULL);
if (daemon_to_unmount_mq == -1) {
- ERROR("mq_open(): %m\n");
+ ERROR_WITH_ERRNO("mq_open()");
ret = WIMLIB_ERR_MQUEUE;
goto err3;
}
if (mq_getattr(unmount_to_daemon_mq, &attr) == 0) {
msgsize = attr.mq_msgsize;
} else {
- ERROR("mq_getattr(): %m\n");
- ERROR("Attempting to read %s\n", msgsize_max_file);
+ ERROR_WITH_ERRNO("mq_getattr()");
+ ERROR("Attempting to read %s", msgsize_max_file);
fp = fopen(msgsize_max_file, "rb");
if (fp) {
if (fscanf(fp, "%d", &msgsize) != 1) {
- ERROR("Assuming message size of 8192\n");
+ ERROR("Assuming message size of 8192");
msgsize = 8192;
}
fclose(fp);
} else {
- ERROR("Failed to open file %s: %m\n",
- msgsize_max_file);
- ERROR("Assuming message size of 8192\n");
+ ERROR_WITH_ERRNO("Failed to open the file `%s'",
+ msgsize_max_file);
+ ERROR("Assuming message size of 8192");
msgsize = 8192;
}
}
/* Closes the staging file descriptor associated with the lookup table entry, if
* it is opened. */
-static int close_staging_file(struct lookup_table_entry *lte, void *ignore)
+static int close_lte_fds(struct lookup_table_entry *lte, void *ignore)
{
- if (lte->staging_file_name && lte->staging_num_times_opened) {
- if (close(lte->staging_fd) != 0) {
- ERROR("Failed close file `%s': %m\n",
- lte->staging_file_name);
- return WIMLIB_ERR_WRITE;
+ for (u16 i = 0; i < lte->num_opened_fds; i++) {
+ if (lte->fds[i].lte && lte->fds[i].staging_fd != -1) {
+ if (close(lte->fds[i].staging_fd) != 0) {
+ ERROR_WITH_ERRNO("Failed close file `%s'",
+ lte->staging_file_name);
+ return WIMLIB_ERR_WRITE;
+ }
}
}
return 0;
* file. Updates the SHA1 sum in the dentry and the lookup table entry. If
* there is already a lookup table entry with the same checksum, increment its
* reference count and destroy the lookup entry with the updated checksum. */
-static int calculate_sha1sum_for_staging_file(struct dentry *dentry, void *lookup_table)
+static int calculate_sha1sum_for_staging_file(struct dentry *dentry,
+ void *_lookup_table)
{
- struct lookup_table *table;
- struct lookup_table_entry *lte;
- struct lookup_table_entry *existing;
- int ret;
-
- table = lookup_table;
- lte = lookup_resource(table, dentry->hash);
-
- if (lte && lte->staging_file_name) {
-
- DEBUG("Calculating SHA1 hash for file `%s'\n", dentry->file_name_utf8);
- ret = sha1sum(lte->staging_file_name, dentry->hash);
- if (ret != 0)
- return ret;
-
- lookup_table_unlink(table, lte);
- memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE);
- existing = lookup_resource(table, dentry->hash);
- if (existing) {
- DEBUG("Merging duplicate lookup table entries for "
- "file `%s'\n", dentry->file_name_utf8);
- free_lookup_table_entry(lte);
- existing->refcnt++;
- } else {
- lookup_table_insert(table, lte);
+ struct lookup_table *lookup_table = _lookup_table;
+ u8 *hash = dentry->hash;
+ u16 i = 0;
+ while (1) {
+ struct lookup_table_entry *lte = __lookup_resource(lookup_table, hash);
+ if (lte && lte->staging_file_name) {
+ struct lookup_table_entry *existing;
+ int ret;
+
+ DEBUG("Calculating SHA1 hash for file `%s'",
+ dentry->file_name_utf8);
+ ret = sha1sum(lte->staging_file_name, lte->hash);
+ if (ret != 0)
+ return ret;
+
+ lookup_table_unlink(lookup_table, lte);
+ memcpy(hash, lte->hash, WIM_HASH_SIZE);
+ existing = __lookup_resource(lookup_table, hash);
+ if (existing) {
+ DEBUG("Merging duplicate lookup table entries for file "
+ "`%s'", dentry->file_name_utf8);
+ free_lookup_table_entry(lte);
+ existing->refcnt++;
+ } else {
+ lookup_table_insert(lookup_table, lte);
+ }
}
+ if (i == dentry->num_ads)
+ break;
+ hash = dentry->ads_entries[i].hash;
+ i++;
}
return 0;
}
root = wim_root_dentry(w);
- DEBUG("Closing all staging file descriptors.\n");
+ DEBUG("Closing all staging file descriptors.");
/* Close all the staging file descriptors. */
- ret = for_lookup_table_entry(w->lookup_table,
- close_staging_file, NULL);
+ ret = for_lookup_table_entry(w->lookup_table, close_lte_fds, NULL);
if (ret != 0) {
- ERROR("Failed to close all staging files!\n");
+ ERROR("Failed to close all staging files");
return ret;
}
- DEBUG("Calculating SHA1 checksums for all new staging files.\n");
+ DEBUG("Calculating SHA1 checksums for all new staging files.");
/* Calculate SHA1 checksums for all staging files, and merge unnecessary
* lookup table entries. */
ret = for_dentry_in_tree(root, calculate_sha1sum_for_staging_file,
w->lookup_table);
if (ret != 0) {
- ERROR("Failed to calculate new SHA1 checksums!\n");
+ ERROR("Failed to calculate new SHA1 checksums");
return ret;
}
ret = wimlib_overwrite(w, check_integrity);
if (ret != 0) {
- ERROR("Failed to commit changes\n");
+ ERROR("Failed to commit changes");
return ret;
}
- ret = delete_staging_dir();
- if (ret != 0) {
- ERROR("Failed to delete the staging directory: %m\n");
- }
return ret;
}
gettimeofday(&now, NULL);
timeout.tv_sec = now.tv_sec + 3;
timeout.tv_nsec = now.tv_usec * 1000;
- DEBUG("Waiting for message telling us whether to commit or not, "
- "and whether to include integrity checks.\n");
+ DEBUG("Waiting for message telling us whether to commit or not, and "
+ "whether to include integrity checks.");
bytes_received = mq_timedreceive(unmount_to_daemon_mq, msg,
msgsize, NULL, &timeout);
check_integrity = msg[1];
if (bytes_received == -1) {
if (errno == ETIMEDOUT) {
- ERROR("Timed out.\n");
+ ERROR("Timed out.");
} else {
- ERROR("mq_timedreceive(): %m\n");
+ ERROR_WITH_ERRNO("mq_timedreceive()");
}
- ERROR("Not committing.\n");
+ ERROR("Not committing.");
} else {
- DEBUG("Received message: [%d %d]\n", msg[0], msg[1]);
+ DEBUG("Received message: [%d %d]", msg[0], msg[1]);
}
- if (commit && (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
- status = chdir(working_directory);
- if (status != 0) {
- ERROR("chdir(): %m\n");
- status = WIMLIB_ERR_NOTDIR;
- goto done;
+ status = 0;
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ if (commit) {
+ status = chdir(working_directory);
+ if (status != 0) {
+ ERROR_WITH_ERRNO("chdir()");
+ status = WIMLIB_ERR_NOTDIR;
+ goto done;
+ }
+ status = rebuild_wim(w, (check_integrity != 0));
+ }
+ ret = delete_staging_dir();
+ if (ret != 0) {
+ ERROR_WITH_ERRNO("Failed to delete the staging "
+ "directory");
+ if (status == 0)
+ status = ret;
}
- status = rebuild_wim(w, (check_integrity != 0));
- } else {
- status = 0;
}
done:
ret = mq_send(daemon_to_unmount_mq, &status, 1, 1);
- if (ret == -1) {
- ERROR("Failed to send status to unmount process: %m\n");
- }
+ if (ret == -1)
+ ERROR_WITH_ERRNO("Failed to send status to unmount process");
close_message_queues();
}
return -EEXIST;
newdir = new_dentry(basename);
- newdir->attributes |= WIM_FILE_ATTRIBUTE_DIRECTORY;
+ newdir->attributes |= FILE_ATTRIBUTE_DIRECTORY;
link_dentry(newdir, parent);
return 0;
}
* @return: The file descriptor for the new file. Returns -1 and sets errno on
* error, for any reason possible from the creat() function.
*/
-static int create_staging_file(char **name_ret)
+static int create_staging_file(char **name_ret, int open_flags)
{
size_t name_len;
char *name;
return -1;
}
- memcpy(name, staging_dir_name, staging_dir_name_len);
- name[staging_dir_name_len] = '/';
- randomize_char_array_with_alnum(name + staging_dir_name_len + 1,
- WIM_HASH_SIZE);
- name[name_len] = '\0';
+ do {
+
+ memcpy(name, staging_dir_name, staging_dir_name_len);
+ name[staging_dir_name_len] = '/';
+ randomize_char_array_with_alnum(name + staging_dir_name_len + 1,
+ WIM_HASH_SIZE);
+ name[name_len] = '\0';
/* Just in case, verify that the randomly generated name doesn't name an
* existing file, and try again if so */
- if (stat(name, &stbuf) == 0) {
- /* stat succeeded-- the file must exist. Try another name. */
- FREE(name);
- return create_staging_file(name_ret);
- } else {
- if (errno != ENOENT)
- /* other error! */
- return -1;
- /* doesn't exist--- ok */
- }
+ } while (stat(name, &stbuf) == 0);
+
+ if (errno != ENOENT)
+ /* other error! */
+ return -1;
+
+ /* doesn't exist--- ok */
- fd = creat(name, 0600);
+ DEBUG("Creating staging file `%s'", name);
+
+ fd = open(name, open_flags | O_CREAT | O_TRUNC, 0600);
if (fd == -1) {
errno_save = errno;
FREE(name);
return fd;
}
-/* Creates a regular file. This is done in the staging directory. */
+/* Creates a regular file. */
static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
{
- struct dentry *parent, *dentry;
- const char *basename;
- struct lookup_table_entry *lte;
- char *tmpfile_name;
- int fd;
- int err;
-
- /* Make sure that the parent of @path exists and is a directory, and
- * that the dentry named by @path does not already exist. */
- parent = get_parent_dentry(w, path);
- if (!parent)
- return -ENOENT;
- if (!dentry_is_directory(parent))
- return -ENOTDIR;
- basename = path_basename(path);
- if (get_dentry_child_with_name(parent, path))
- return -EEXIST;
-
- dentry = new_dentry(basename);
-
- /* XXX fill in a temporary random hash value- really should check for
- * duplicates */
- randomize_byte_array(dentry->hash, WIM_HASH_SIZE);
-
- /* Create a lookup table entry having the same hash value */
- lte = new_lookup_table_entry();
- lte->staging_num_times_opened = 0;
- lte->resource_entry.original_size = 0;
- memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE);
-
- fd = create_staging_file(&tmpfile_name);
-
- if (fd == -1)
- goto mknod_error;
-
- if (close(fd) != 0)
- goto mknod_error;
-
- lte->staging_file_name = tmpfile_name;
+ const char *stream_name;
+ if ((mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
+ && (stream_name = path_stream_name(path))) {
+ struct ads_entry *new_entry;
+ struct dentry *dentry;
+
+ dentry = get_dentry(w, path);
+ if (!dentry || !dentry_is_regular_file(dentry))
+ return -ENOENT;
+ if (dentry_get_ads_entry(dentry, stream_name))
+ return -EEXIST;
+ new_entry = dentry_add_ads(dentry, stream_name);
+ if (!new_entry)
+ return -ENOENT;
+ } else {
+ struct dentry *dentry, *parent;
+ const char *basename;
- /* Insert the lookup table entry, and link the new dentry with its
- * parent. */
- lookup_table_insert(w->lookup_table, lte);
- link_dentry(dentry, parent);
+ /* Make sure that the parent of @path exists and is a directory, and
+ * that the dentry named by @path does not already exist. */
+ parent = get_parent_dentry(w, path);
+ if (!parent)
+ return -ENOENT;
+ if (!dentry_is_directory(parent))
+ return -ENOTDIR;
+ basename = path_basename(path);
+ if (get_dentry_child_with_name(parent, path))
+ return -EEXIST;
+
+ dentry = new_dentry(basename);
+ link_dentry(dentry, parent);
+ }
return 0;
-mknod_error:
- err = errno;
- free_lookup_table_entry(lte);
- return -err;
}
+
/* Open a file. */
static int wimfs_open(const char *path, struct fuse_file_info *fi)
{
struct dentry *dentry;
struct lookup_table_entry *lte;
-
- dentry = get_dentry(w, path);
+ u8 *dentry_hash;
+ int ret;
+ struct wimlib_fd *fd;
- if (!dentry)
- return -EEXIST;
- if (dentry_is_directory(dentry))
- return -EISDIR;
- lte = wim_lookup_resource(w, dentry);
- if (!lte)
- return 0;
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry, <e,
+ &dentry_hash);
+ if (ret != 0)
+ return ret;
- if (lte->staging_file_name) {
+ if (lte) {
+ /* Common case--- there's a lookup table entry for a file.
+ * Allocate a new file descriptor for it. */
- /* If this file is in the staging directory and the file is not
- * currently open, open it. */
- if (lte->staging_num_times_opened == 0) {
- lte->staging_fd = open(lte->staging_file_name, O_RDWR);
- if (lte->staging_fd == -1)
+ ret = alloc_fd(lte, &fd);
+ if (ret != 0)
+ return ret;
+
+ /* The file resource may be in the staging directory (read-write
+ * mounts only) or in the WIM. If it's in the staging
+ * directory, we need to open a native file descriptor for the
+ * corresponding file. Otherwise, we can read the file resource
+ * directly from the WIM file if we are opening it read-only,
+ * but we need to extract the resource to the staging directory
+ * if we are opening it writable. */
+ if (lte->staging_file_name) {
+ fd->staging_fd = open(lte->staging_file_name, fi->flags);
+ if (fd->staging_fd == -1) {
+ close_fd(fd);
return -errno;
- lte->staging_offset = 0;
- }
+ }
+ } else if (flags_writable(fi->flags)) {
+
+ ret = extract_resource_to_staging_dir(lte,
+ lte->resource_entry.original_size);
+ }
+ } else {
+ /* Empty file with no lookup-table entry. This is fine if it's
+ * a read-only filesystem. Otherwise we need to create a lookup
+ * table entry so that we can keep track of the file descriptors
+ * (this is important in case someone opens the file for
+ * writing) */
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
+ fi->fd = 0;
+ return 0;
+ }
+ char *tmpfile_name;
+ int fd;
+
+ fd = create_staging_file(&tmpfile_name, O_RDWR);
+ if (fd == -1)
+ return -errno;
+
+ lte = new_lookup_table_entry();
+ if (!lte)
+ return -ENOMEM;
+
+ randomize_byte_array(lte->hash, WIM_HASH_SIZE);
+ memcpy(dentry_hash, lte->hash, WIM_HASH_SIZE);
+ lte->staging_file_name = tmpfile_name;
+ lte->staging_fd = fd;
+ lookup_table_insert(w->lookup_table, lte);
}
- lte->staging_num_times_opened++;
+ fi->fd = (uint64_t)fd;
return 0;
}
dentry = get_dentry(w, path);
if (!dentry || !dentry_is_directory(dentry))
return -ENOTDIR;
+ fi->fd = (uint64_t)dentry;
return 0;
}
* Read data from a file in the WIM or in the staging directory.
*/
static int wimfs_read(const char *path, char *buf, size_t size,
- off_t offset, struct fuse_file_info *fi)
+ off_t offset, struct fuse_file_info *fi)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
-
- dentry = get_dentry(w, path);
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
- if (!dentry)
- return -EEXIST;
+ wimlib_assert(fd->lte);
+ wimlib_assert(fd->lte->staging_dir_name);
- if (!dentry_is_regular_file(dentry))
- return -EISDIR;
+ if (fd->lte->staging_file_name) {
+ /* Read from staging file */
- lte = wim_lookup_resource(w, dentry);
+ wimlib_assert(fd->staging_fd != -1);
- if (!lte)
- return 0;
-
- if (lte->staging_file_name) {
-
- /* Read from staging */
- int fd;
- off_t cur_offset;
ssize_t ret;
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
-
- fd = lte->staging_fd;
- cur_offset = lte->staging_offset;
- if (cur_offset != offset)
- if (lseek(fd, offset, SEEK_SET) == -1)
- return -errno;
- lte->staging_offset = offset;
-
- ret = read(fd, buf, size);
+ if (lseek(fd->staging_fd, offset, SEEK_SET) == -1)
+ return -errno;
+ ret = read(fd->staging_fd, buf, size);
if (ret == -1)
return -errno;
- lte->staging_offset = offset + ret;
-
return ret;
} else {
static int wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
- struct dentry *parent;
- struct dentry *child;
- struct stat st;
-
- parent = get_dentry(w, path);
-
- if (!parent)
- return -EEXIST;
-
- if (!dentry_is_directory(parent))
- return -ENOTDIR;
-
+ struct dentry *parent = (struct dentry*) fi->fh;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
return 0;
do {
- memset(&st, 0, sizeof(st));
- if (filler(buf, child->file_name_utf8, &st, 0))
+ if (filler(buf, child->file_name_utf8, NULL, 0))
return 0;
child = child->next;
} while (child != parent->children);
return 0;
}
-/* Close a file. */
-static int wimfs_release(const char *path, struct fuse_file_info *fi)
+
+static int wimfs_readlink(const char *path, char *buf, size_t buf_len)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
+ struct dentry *dentry = get_dentry(w, path);
int ret;
-
- dentry = get_dentry(w, path);
if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
+ return -ENOENT;
+ if (!dentry_is_symlink(dentry))
+ return -EINVAL;
- if (!lte)
- return 0;
-
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
+ ret = dentry_readlink(dentry, buf, buf_len, w);
+ if (ret > 0)
+ ret = 0;
+ return ret;
+}
- if (--lte->staging_num_times_opened == 0 && lte->staging_file_name) {
- ret = close(lte->staging_fd);
- if (ret != 0)
- return -errno;
- }
- return 0;
+/* Close a file. */
+static int wimfs_release(const char *path, struct fuse_file_info *fi)
+{
+ int ret;
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+
+ wimlib_assert(fd->lte);
+ wimlib_assert(fd->num_opened_fds);
+ return close_fd(fd);
}
/* Renames a file or directory. See rename (3) */
dentry = get_dentry(w, path);
if (!dentry)
- return -EEXIST;
+ return -ENOENT;
if (!dentry_is_empty_directory(dentry))
- return -EEXIST;
+ return -ENOTEMPTY;
unlink_dentry(dentry);
free_dentry(dentry);
return 0;
}
-/* Extracts the resource corresponding to @dentry and its lookup table entry
- * @lte to a file in the staging directory. The lookup table entry for @dentry
- * is updated to point to the new file. If @lte has multiple dentries
- * referencing it, a new lookup table entry is created and the hash of @dentry
- * is changed to point to the new lookup table entry.
- *
+/*
+ * Extract a WIM resource to the staging directory.
* Only @size bytes are extracted, to support truncating the file.
*
- * Returns the negative error code on failure.
+ * We need to:
+ * - Create a staging file for the WIM resource
+ * - Extract the resource to it
+ * - Create a new lte for the file resource
+ * - Transfer fds from the old lte to the new lte, but
+ * only if they share the same hard link group as this
+ * dentry
*/
-static int extract_resource_to_staging_dir(struct dentry *dentry,
- struct lookup_table_entry *lte,
+static int extract_resource_to_staging_dir(struct lookup_table_entry *lte,
u64 size)
{
- int err, fd;
- bool ret;
char *staging_file_name;
+ int ret;
+ int fd;
struct lookup_table_entry *new_lte;
-
- /* File in WIM. Copy it to the staging directory. */
+
fd = create_staging_file(&staging_file_name);
if (fd == -1)
return -errno;
return ret;
}
- if (lte->refcnt != 1) {
+ /* XXX
+ * Need to figure out how to avoid creating orphan lookup table entries.
+ * XXX
+ */
+ if (lte->refcnt == 1) {
+ new_lte = lte;
+ } else {
/* Need to make a new lookup table entry if we are
* changing only one copy of a hardlinked entry */
lte->refcnt--;
new_lte = new_lookup_table_entry();
if (!new_lte)
return -ENOMEM;
- randomize_byte_array(dentry->hash, WIM_HASH_SIZE);
- memcpy(new_lte->hash, dentry->hash, WIM_HASH_SIZE);
+ randomize_byte_array(dentry_hash, WIM_HASH_SIZE);
+ memcpy(new_lte->hash, dentry_hash, WIM_HASH_SIZE);
new_lte->resource_entry.flags = 0;
new_lte->staging_num_times_opened = lte->staging_num_times_opened;
struct dentry *dentry;
struct lookup_table_entry *lte;
int ret;
+ u8 *dentry_hash;
+
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry,
+ <e, &dentry_hash);
+
+ if (ret != 0)
+ return ret;
+
+ if (!lte) /* Already a zero-length file */
+ return 0;
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
- if (!lte)
- return -EEXIST;
if (lte->staging_file_name) {
/* File on disk. Call POSIX API */
if (lte->staging_num_times_opened != 0)
return -errno;
dentry_update_all_timestamps(dentry);
lte->resource_entry.original_size = size;
- return 0;
} else {
/* File in WIM. Extract it to the staging directory, but only
* the first @size bytes of it. */
- return extract_resource_to_staging_dir(dentry, lte, size);
+ ret = extract_resource_to_staging_dir(dentry_hash, lte, size);
}
+ return ret;
}
/* Remove a regular file */
{
struct dentry *dentry;
struct lookup_table_entry *lte;
+ int ret;
+ u8 *dentry_hash;
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry,
+ <e, &dentry_hash);
- if (!dentry_is_regular_file(dentry))
- return -EEXIST;
+ if (ret != 0)
+ return ret;
- lte = wim_lookup_resource(w, dentry);
- if (lte) {
- if (lte->staging_file_name)
- if (unlink(lte->staging_file_name) != 0)
- return -errno;
- lookup_table_decrement_refcnt(w->lookup_table, dentry->hash);
+ if (lte && lte->staging_file_name)
+ if (unlink(lte->staging_file_name) != 0)
+ return -errno;
+
+ if (dentry_hash == dentry->hash) {
+ /* We are removing the full dentry including all alternate data
+ * streams. */
+ const u8 *hash = dentry->hash;
+ u16 i = 0;
+ while (1) {
+ lookup_table_decrement_refcnt(w->lookup_table, hash);
+ if (i == dentry->num_ads)
+ break;
+ hash = dentry->ads_entries[i].hash;
+ i++;
+ }
+
+ unlink_dentry(dentry);
+ free_dentry(dentry);
+ } else {
+ /* We are removing an alternate data stream. */
+ struct ads_entry *cur_entry = dentry->ads_entries;
+ while (cur_entry->hash != dentry_hash)
+ cur_entry++;
+ lookup_table_decrement_refcnt(w->lookup_table, cur_entry->hash);
+
+ dentry_remove_ads(dentry, cur_entry);
}
+ /* Beware: The lookup table entry(s) may still be referenced by users
+ * that have opened the corresponding streams. They are freed later in
+ * wimfs_release() when the last file user has closed the stream. */
+ return 0;
+}
- unlink_dentry(dentry);
- free_dentry(dentry);
+/* Change the timestamp on a file dentry.
+ *
+ * There is no distinction between a file and its alternate data streams here. */
+static int wimfs_utimens(const char *path, const struct timespec tv[2])
+{
+ struct dentry *dentry = get_dentry(w, path);
+ if (!dentry)
+ return -ENOENT;
+ time_t last_access_t = (tv[0].tv_nsec == UTIME_NOW) ?
+ time(NULL) : tv[0].tv_sec;
+ dentry->last_access_time = unix_timestamp_to_ms(last_access_t);
+ time_t last_mod_t = (tv[1].tv_nsec == UTIME_NOW) ?
+ time(NULL) : tv[1].tv_sec;
+ dentry->last_write_time = unix_timestamp_to_ms(last_mod_t);
return 0;
}
-/* Writes to a file in the WIM filesystem. */
+/* Writes to a file in the WIM filesystem.
+ * It may be an alternate data stream, but here we don't even notice because we
+ * just get a lookup table entry. */
static int wimfs_write(const char *path, const char *buf, size_t size,
- off_t offset, struct fuse_file_info *fi)
+ off_t offset, struct fuse_file_info *fi)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
- ssize_t ret;
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+ int ret;
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
- if (!lte)
- return -EEXIST;
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
- if (lte->staging_file_name) {
+ wimlib_assert(fd->lte);
+ wimlib_assert(fd->lte->staging_dir_name);
+ wimlib_assert(fd->staging_fd != -1);
- /* File in staging directory. We can write to it directly. */
+ /* Seek to correct position in file if needed. */
+ if (lte->staging_offset != offset) {
+ if (lseek(lte->staging_fd, offset, SEEK_SET) == -1)
+ return -errno;
+ lte->staging_offset = offset;
+ }
- /* Seek to correct position in file if needed. */
- if (lte->staging_offset != offset) {
- if (lseek(lte->staging_fd, offset, SEEK_SET) == -1)
- return -errno;
- lte->staging_offset = offset;
- }
+ /* Write the data. */
+ ret = write(lte->staging_fd, buf, size);
+ if (ret == -1)
+ return -errno;
- /* Write the data. */
- ret = write(lte->staging_fd, buf, size);
- if (ret == -1)
- return -errno;
+ /* Adjust the stored offset of staging_fd. */
+ lte->staging_offset = offset + ret;
- /* Adjust the stored offset of staging_fd. */
- lte->staging_offset = offset + ret;
+ /* Increase file size if needed. */
+ if (lte->resource_entry.original_size < lte->staging_offset)
+ lte->resource_entry.original_size = lte->staging_offset;
- /* Increase file size if needed. */
- if (lte->resource_entry.original_size < lte->staging_offset)
- lte->resource_entry.original_size = lte->staging_offset;
+ /* The file has been modified, so all its timestamps must be
+ * updated. */
+ dentry_update_all_timestamps(dentry);
- /* The file has been modified, so all its timestamps must be
- * updated. */
- dentry_update_all_timestamps(dentry);
- return ret;
- } else {
- /* File in the WIM. We must extract it to the staging directory
- * before it can be written to. */
- ret = extract_resource_to_staging_dir(dentry, lte,
- lte->resource_entry.original_size);
- if (ret != 0)
- return ret;
- else
- return wimfs_write(path, buf, size, offset, fi);
- }
+ return ret;
}
.opendir = wimfs_opendir,
.read = wimfs_read,
.readdir = wimfs_readdir,
+ .readlink = wimfs_readlink,
.release = wimfs_release,
.rename = wimfs_rename,
.rmdir = wimfs_rmdir,
.truncate = wimfs_truncate,
.unlink = wimfs_unlink,
+ .utimens = wimfs_utimens,
.write = wimfs_write,
};
if (flags & WIMLIB_MOUNT_FLAG_READWRITE)
wim_get_current_image_metadata(wim)->modified = true;
+ if (!(flags & (WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE |
+ WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR |
+ WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)))
+ flags |= WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR;
+
mount_dir = dir;
working_directory = getcwd(NULL, 0);
if (!working_directory) {
- ERROR("Could not determine current directory: %m\n");
+ ERROR_WITH_ERRNO("Could not determine current directory");
return WIMLIB_ERR_NOTDIR;
}
mount_dir = dir;
pid = fork();
if (pid == -1) {
- ERROR("Failed to fork(): %m\n");
+ ERROR_WITH_ERRNO("Failed to fork()");
return WIMLIB_ERR_FORK;
}
if (pid == 0) {
execlp("fusermount", "fusermount", "-u", dir, NULL);
- ERROR("Failed to execute `fusermount': %m\n");
+ ERROR_WITH_ERRNO("Failed to execute `fusermount'");
return WIMLIB_ERR_FUSERMOUNT;
}
ret = waitpid(pid, &status, 0);
if (ret == -1) {
- ERROR("Failed to wait for fusermount process to "
- "terminate: %m\n");
+ ERROR_WITH_ERRNO("Failed to wait for fusermount process to "
+ "terminate");
return WIMLIB_ERR_FUSERMOUNT;
}
if (status != 0) {
- ERROR("fusermount exited with status %d!\n", status);
+ ERROR("fusermount exited with status %d", status);
return WIMLIB_ERR_FUSERMOUNT;
}
msg[0] = (flags & WIMLIB_UNMOUNT_FLAG_COMMIT) ? 1 : 0;
msg[1] = (flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY) ? 1 : 0;
- DEBUG("Sending message: %s, %s\n",
+ DEBUG("Sending message: %s, %s",
(msg[0] == 0) ? "don't commit" : "commit",
(msg[1] == 0) ? "don't check" : "check");
ret = mq_send(unmount_to_daemon_mq, msg, 2, 1);
if (ret == -1) {
- ERROR("Failed to notify filesystem daemon whether "
- "we want to commit changes or not!\n");
+ ERROR("Failed to notify filesystem daemon whether we want to "
+ "commit changes or not");
close_message_queues();
return WIMLIB_ERR_MQUEUE;
}
mailbox[0] = 0;
DEBUG("Waiting for message telling us whether the unmount was "
- "successful or not.\n");
+ "successful or not.");
ret = mq_timedreceive(daemon_to_unmount_mq, mailbox, msgsize,
NULL, &timeout);
errno_save = errno;
close_message_queues();
if (ret == -1) {
if (errno_save == ETIMEDOUT) {
- ERROR("Timed out- probably the filesystem "
- "daemon crashed and the WIM was not "
- "written successfully.\n");
+ ERROR("Timed out- probably the filesystem daemon "
+ "crashed and the WIM was not written "
+ "successfully.");
return WIMLIB_ERR_TIMEOUT;
} else {
- ERROR("mq_receive(): %s\n",
- strerror(errno_save));
+ ERROR("mq_receive(): %s", strerror(errno_save));
return WIMLIB_ERR_MQUEUE;
}
}
- DEBUG("Received message: %s\n", (mailbox[0] == 0) ?
- "Unmount OK" : "Unmount Failed");
+ DEBUG("Received message: %s",
+ (mailbox[0] == 0) ? "Unmount OK" : "Unmount Failed");
if (mailbox[0] != 0)
- ERROR("Unmount failed\n");
+ ERROR("Unmount failed");
return mailbox[0];
}
static inline int mount_unsupported_error()
{
- ERROR("WIMLIB was compiled with --without-fuse, which "
- "disables support for mounting WIMs.\n");
+ ERROR("WIMLIB was compiled with --without-fuse, which disables support "
+ "for mounting WIMs.");
return WIMLIB_ERR_UNSUPPORTED;
}
git://wimlib.net / wimlib / blobdiff