/*
* mount_image.c
*
- * This file implements mounting of WIM files using FUSE, which stands for
- * Filesystem in Userspace. FUSE allows a filesystem to be implemented in a
- * userspace process by implementing the filesystem primitives--- read(),
- * write(), readdir(), etc.
+ * This file implements mounting of WIM images using FUSE
+ * (Filesystem in Userspace). See http://fuse.sourceforge.net/.
+ *
+ * Currently it is only expected to work on Linux.
*/
/*
* Copyright (C) 2012, 2013, 2014 Eric Biggers
*
- * This file is part of wimlib, a library for working with WIM files.
- *
- * wimlib 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.
+ * This file 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 3 of the License, or (at your option) any
+ * later version.
*
- * 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 General Public License for more
+ * This file 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 General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
*/
#ifdef HAVE_CONFIG_H
#endif
#include "wimlib.h"
+#include "wimlib/error.h"
#ifdef WITH_FUSE
#include "wimlib/dentry.h"
#include "wimlib/encoding.h"
+#include "wimlib/lookup_table.h"
#include "wimlib/metadata.h"
#include "wimlib/paths.h"
#include "wimlib/progress.h"
/* Original list of single-instance streams in the mounted image, linked
* by 'struct wim_lookup_table_entry'.orig_stream_list. */
struct list_head orig_stream_list;
+
+ /* Parameters for unmounting the image (can be set via extended
+ * attribute "wimfs.unmount_info"). */
+ struct wimfs_unmount_info unmount_info;
};
#define WIMFS_CTX(fuse_ctx) ((struct wimfs_context*)(fuse_ctx)->private_data)
return wimfs_get_context()->wim;
}
-static inline int
-get_lookup_flags(const struct wimfs_context *ctx)
-{
- return ctx->default_lookup_flags;
-}
-
/* Is write permission requested on the file? */
static inline bool
flags_writable(int open_flags)
if (fd->f_idx < inode->i_next_fd)
inode->i_next_fd = fd->f_idx;
FREE(fd);
- if (--inode->i_num_opened_fds == 0) {
- /* The last file descriptor to this inode was closed. */
- FREE(inode->i_fds);
- inode->i_fds = NULL;
- inode->i_num_allocated_fds = 0;
- if (inode->i_nlink == 0)
- /* No links to this inode remain. Get rid of it. */
- free_inode(inode);
- }
+ inode_dec_num_opened_fds(inode);
return ret;
}
return dentry->d_inode;
}
+/* Can look up named data stream with colon syntax */
+#define LOOKUP_FLAG_ADS_OK 0x01
+
+/* Can look up directory (otherwise get -ENOTDIR) */
+#define LOOKUP_FLAG_DIRECTORY_OK 0x02
+
+/*
+ * Translate a path into the corresponding dentry, lookup table entry, and
+ * stream index in the mounted WIM image.
+ *
+ * Returns 0 or a -errno code. All of @dentry_ret, @lte_ret, and
+ * @stream_idx_ret are optional.
+ */
+static int
+wim_pathname_to_stream(const struct wimfs_context *ctx, const char *path,
+ int lookup_flags,
+ struct wim_dentry **dentry_ret,
+ struct wim_lookup_table_entry **lte_ret,
+ unsigned *stream_idx_ret)
+{
+ WIMStruct *wim = ctx->wim;
+ struct wim_dentry *dentry;
+ struct wim_lookup_table_entry *lte;
+ unsigned stream_idx;
+ const char *stream_name = NULL;
+ struct wim_inode *inode;
+ char *p = NULL;
+
+ lookup_flags |= ctx->default_lookup_flags;
+
+ if (lookup_flags & LOOKUP_FLAG_ADS_OK) {
+ stream_name = path_stream_name(path);
+ if (stream_name) {
+ p = (char *)stream_name - 1;
+ *p = '\0';
+ }
+ }
+
+ dentry = get_dentry(wim, path, WIMLIB_CASE_SENSITIVE);
+ if (p)
+ *p = ':';
+ if (!dentry)
+ return -errno;
+
+ inode = dentry->d_inode;
+
+ if (inode_resolve_streams(inode, wim->lookup_table, false))
+ return -EIO;
+
+ if (!(lookup_flags & LOOKUP_FLAG_DIRECTORY_OK)
+ && inode_is_directory(inode))
+ return -EISDIR;
+
+ if (stream_name) {
+ struct wim_ads_entry *ads_entry;
+
+ ads_entry = inode_get_ads_entry(inode, stream_name);
+ if (!ads_entry)
+ return -errno;
+
+ stream_idx = ads_entry - inode->i_ads_entries + 1;
+ lte = ads_entry->lte;
+ } else {
+ lte = inode_unnamed_stream_resolved(inode, &stream_idx);
+ }
+ if (dentry_ret)
+ *dentry_ret = dentry;
+ if (lte_ret)
+ *lte_ret = lte;
+ if (stream_idx_ret)
+ *stream_idx_ret = stream_idx;
+ return 0;
+}
+
/*
* Create a new file in the mounted WIM image.
*
dentry_add_child(parent, new_dentry);
- if (dentry_ret)
- *dentry_ret = new_dentry;
+ *dentry_ret = new_dentry;
return 0;
}
stbuf->st_mtim = wim_timestamp_to_timespec(inode->i_last_write_time);
stbuf->st_ctim = stbuf->st_mtim;
#else
- stbuf->st_atime = wim_timestamp_to_unix(inode->i_last_access_time);
- stbuf->st_mtime = wim_timestamp_to_unix(inode->i_last_write_time);
+ stbuf->st_atime = wim_timestamp_to_time_t(inode->i_last_access_time);
+ stbuf->st_mtime = wim_timestamp_to_time_t(inode->i_last_write_time);
stbuf->st_ctime = stbuf->st_mtime;
#endif
- stbuf->st_blocks = (stbuf->st_size + 511) / 512;
+ stbuf->st_blocks = DIV_ROUND_UP(stbuf->st_size, 512);
return 0;
}
static void
touch_inode(struct wim_inode *inode)
{
- u64 now = get_wim_timestamp();
+ u64 now = now_as_wim_timestamp();
inode->i_last_access_time = now;
inode->i_last_write_time = now;
}
+static void
+touch_parent(struct wim_dentry *dentry)
+{
+ touch_inode(dentry->d_parent->d_inode);
+}
+
/*
* Create a new file in the staging directory for a read-write mounted image.
*
*/
static int
extract_resource_to_staging_dir(struct wim_inode *inode,
- u16 stream_idx,
+ unsigned stream_idx,
struct wim_lookup_table_entry **lte_ptr,
off_t size,
const struct wimfs_context *ctx)
return ret;
}
-/* Deletes the staging directory, undoing the effects of a succesful call to
+/* Deletes the staging directory, undoing the effects of a successful call to
* make_staging_dir(). */
static void
delete_staging_dir(struct wimfs_context *ctx)
close(ctx->parent_dir_fd);
}
+/* Number the inodes in the mounted image sequentially. */
static void
reassign_inode_numbers(struct wimfs_context *ctx)
{
}
}
+/* Delete the 'struct wim_lookup_table_entry' for any stream that was modified
+ * or created in the read-write mounted image and had a final size of 0. */
static void
delete_empty_streams(struct wimfs_context *ctx)
{
}
}
+/* Close all file descriptors open to the specified inode.
+ *
+ * Note: closing the last file descriptor might free the inode. */
static void
inode_close_fds(struct wim_inode *inode)
{
}
}
+/* Close all file descriptors open to the mounted image. */
static void
close_all_fds(struct wimfs_context *ctx)
{
if (ret)
goto err_free_new_lte;
- ret = xml_add_image(wim, T(""));
+ ret = xml_add_image(wim, "");
if (ret)
goto err_undo_append;
xml_update_image_info(ctx->wim, ctx->wim->current_image);
write_flags = 0;
+
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY)
write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
+
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_REBUILD)
write_flags |= WIMLIB_WRITE_FLAG_REBUILD;
+
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_RECOMPRESS)
write_flags |= WIMLIB_WRITE_FLAG_RECOMPRESS;
+
return wimlib_overwrite(ctx->wim, write_flags, 0);
}
+/* In the case of an allow_other mount, only the mount owner and root are
+ * allowed to unmount the filesystem. */
+static bool
+may_unmount_wimfs(void)
+{
+ const struct fuse_context *fuse_ctx = fuse_get_context();
+ const struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
+
+ return (fuse_ctx->uid == wimfs_ctx->owner_uid ||
+ fuse_ctx->uid == 0);
+}
+
+/* Unmount the mounted image, called from the daemon process. */
static int
-unmount_wimfs(const struct wimfs_unmount_info *info)
+unmount_wimfs(void)
{
struct fuse_context *fuse_ctx = fuse_get_context();
struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
+ const struct wimfs_unmount_info *info = &wimfs_ctx->unmount_info;
int unmount_flags = info->unmount_flags;
mqd_t mq = (mqd_t)-1;
- int status;
-
- if (fuse_ctx->uid != wimfs_ctx->owner_uid &&
- fuse_ctx->uid != 0)
- return -EPERM;
-
- if (info->mq_name[0]) {
- mq = mq_open(info->mq_name, O_WRONLY | O_NONBLOCK);
- if (mq == (mqd_t)-1)
- return -errno;
- }
+ int ret;
/* Ignore COMMIT if the image is mounted read-only. */
if (!(wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE))
unmount_flags &= ~WIMLIB_UNMOUNT_FLAG_COMMIT;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_SEND_PROGRESS) {
+ mq = mq_open(info->mq_name, O_WRONLY | O_NONBLOCK);
+ if (mq == (mqd_t)-1) {
+ ret = WIMLIB_ERR_MQUEUE;
+ goto out;
+ }
+ }
+
if (wimfs_ctx->num_open_fds) {
+
+ /* There are still open file descriptors to the image. */
+
+ /* With COMMIT, refuse to unmount unless FORCE is also
+ * specified. */
if ((unmount_flags & (WIMLIB_UNMOUNT_FLAG_COMMIT |
WIMLIB_UNMOUNT_FLAG_FORCE))
== WIMLIB_UNMOUNT_FLAG_COMMIT)
{
- status = WIMLIB_ERR_MOUNTED_IMAGE_IS_BUSY;
- goto out_send_status;
+ ret = WIMLIB_ERR_MOUNTED_IMAGE_IS_BUSY;
+ goto out;
}
+
+ /* Force-close all file descriptors. */
close_all_fds(wimfs_ctx);
}
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT)
- status = commit_image(wimfs_ctx, unmount_flags, mq);
+ ret = commit_image(wimfs_ctx, unmount_flags, mq);
else
- status = 0;
- fuse_exit(fuse_ctx->fuse);
-out_send_status:
- if (mq != (mqd_t)-1) {
- mq_send(mq, (const char *)&status, sizeof(int), 1);
- mq_close(mq);
+ ret = 0; /* Read-only mount, or discarding changes to
+ a read-write mount */
+
+out:
+ /* Leave the image mounted if commit failed, unless this is a
+ * forced unmount. The user can retry without COMMIT if they
+ * want. */
+ if (!ret || (unmount_flags & WIMLIB_UNMOUNT_FLAG_FORCE)) {
+ unlock_wim_for_append(wimfs_ctx->wim);
+ fuse_exit(fuse_ctx->fuse);
}
- return 0;
+ if (mq != (mqd_t)-1)
+ mq_close(mq);
+ return ret;
}
static int
struct wim_lookup_table_entry *lte;
int ret;
- ret = wim_pathname_to_stream(ctx->wim, path,
- get_lookup_flags(ctx) |
- LOOKUP_FLAG_DIRECTORY_OK,
+ ret = wim_pathname_to_stream(ctx, path, LOOKUP_FLAG_DIRECTORY_OK,
&dentry, <e, NULL);
if (ret)
return ret;
static int
copy_xattr(char *dest, size_t destsize, const void *src, size_t srcsize)
{
- if (!destsize)
- return srcsize;
- if (destsize < srcsize)
- return -ERANGE;
- memcpy(dest, src, srcsize);
+ if (destsize) {
+ if (destsize < srcsize)
+ return -ERANGE;
+ memcpy(dest, src, srcsize);
+ }
return srcsize;
}
wimfs_getxattr(const char *path, const char *name, char *value,
size_t size)
{
- struct fuse_context *fuse_ctx = fuse_get_context();
- const struct wimfs_context *ctx = WIMFS_CTX(fuse_ctx);
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_inode *inode;
struct wim_ads_entry *ads_entry;
struct wim_lookup_table_entry *lte;
&ctx->mount_flags, sizeof(int));
}
if (!strcmp(name, "unmount")) {
- struct wimfs_unmount_info info;
- memset(&info, 0, sizeof(info));
- return unmount_wimfs(&info);
+ if (!may_unmount_wimfs())
+ return -EPERM;
+ if (size) {
+ int status;
+
+ if (size < sizeof(int))
+ return -ERANGE;
+ status = unmount_wimfs();
+ memcpy(value, &status, sizeof(int));
+ }
+ return sizeof(int);
}
return -ENOATTR;
}
return -EFBIG;
if (size) {
- if (lte->size > size)
+ if (size < lte->size)
return -ERANGE;
if (read_full_stream_into_buf(lte, value))
- return -errno;
+ return errno ? -errno : -EIO;
}
return lte->size;
}
if (new_dentry(new_name, &new_alias))
return -ENOMEM;
- new_alias->d_inode = inode;
- inode_add_dentry(new_alias, inode);
- dentry_add_child(dir, new_alias);
- inode->i_nlink++;
inode_ref_streams(inode);
+ d_associate(new_alias, inode);
+ dentry_add_child(dir, new_alias);
+ touch_inode(dir->d_inode);
return 0;
}
static int
wimfs_mkdir(const char *path, mode_t mode)
{
+ struct wim_dentry *dentry;
+ int ret;
+
/* Note: according to fuse.h, mode may not include S_IFDIR */
- return create_dentry(fuse_get_context(), path, mode | S_IFDIR, 0,
- FILE_ATTRIBUTE_DIRECTORY, NULL);
+ ret = create_dentry(fuse_get_context(), path, mode | S_IFDIR, 0,
+ FILE_ATTRIBUTE_DIRECTORY, &dentry);
+ if (ret)
+ return ret;
+ touch_parent(dentry);
+ return 0;
}
static int
} else {
/* Create a regular file, device node, named pipe, or socket.
*/
+ struct wim_dentry *dentry;
+ int ret;
if (!S_ISREG(mode) &&
!(wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
/* Note: we still use FILE_ATTRIBUTE_NORMAL for device nodes,
* named pipes, and sockets. The real mode is in the UNIX
* metadata. */
- return create_dentry(fuse_ctx, path, mode, rdev,
- FILE_ATTRIBUTE_NORMAL, NULL);
+ ret = create_dentry(fuse_ctx, path, mode, rdev,
+ FILE_ATTRIBUTE_NORMAL, &dentry);
+ if (ret)
+ return ret;
+ touch_parent(dentry);
+ return 0;
}
}
struct wim_dentry *dentry;
struct wim_inode *inode;
struct wim_lookup_table_entry *lte;
- u16 stream_idx;
+ unsigned stream_idx;
struct wimfs_fd *fd;
int ret;
- ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
- &dentry, <e, &stream_idx);
+ ret = wim_pathname_to_stream(ctx, path, 0, &dentry, <e, &stream_idx);
if (ret)
return ret;
switch (lte->resource_location) {
case RESOURCE_IN_WIM:
if (read_partial_wim_stream_into_buf(lte, size, offset, buf))
- ret = -errno;
+ ret = errno ? -errno : -EIO;
else
ret = size;
break;
if (dentry_has_children(dentry))
return -ENOTEMPTY;
+ touch_parent(dentry);
remove_dentry(dentry, wim->lookup_table);
return 0;
}
if (!strncmp(name, "wimfs.", 6)) {
/* Handle some magical extended attributes. These really should
* be ioctls, but directory ioctls aren't supported until
- * libfuse 2.9, and even then they are broken. */
+ * libfuse 2.9, and even then they are broken. [Fixed by
+ * libfuse commit e3b7d4c278a26520be63d99d6ea84b26906fe73d] */
name += 6;
- if (!strcmp(name, "unmount")) {
+ if (!strcmp(name, "unmount_info")) {
+ if (!may_unmount_wimfs())
+ return -EPERM;
if (size < sizeof(struct wimfs_unmount_info))
return -EINVAL;
- return unmount_wimfs((const void *)value);
+ memcpy(&ctx->unmount_info, value,
+ sizeof(struct wimfs_unmount_info));
+ return 0;
}
return -ENOATTR;
}
ret = -ENOMEM;
else
ret = -EINVAL;
+ } else {
+ touch_parent(dentry);
}
return ret;
}
const struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
struct wim_lookup_table_entry *lte;
- u16 stream_idx;
+ unsigned stream_idx;
int ret;
int fd;
- ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
- &dentry, <e, &stream_idx);
-
+ ret = wim_pathname_to_stream(ctx, path, 0, &dentry, <e, &stream_idx);
if (ret)
return ret;
{
const struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
- u16 stream_idx;
+ unsigned stream_idx;
int ret;
- ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
- &dentry, NULL, &stream_idx);
-
+ ret = wim_pathname_to_stream(ctx, path, 0, &dentry, NULL, &stream_idx);
if (ret)
return ret;
- if (inode_stream_name_nbytes(dentry->d_inode, stream_idx) == 0)
+ if (inode_stream_name_nbytes(dentry->d_inode, stream_idx) == 0) {
+ touch_parent(dentry);
remove_dentry(dentry, ctx->wim->lookup_table);
- else
+ } else {
inode_remove_ads(dentry->d_inode,
&dentry->d_inode->i_ads_entries[stream_idx - 1],
ctx->wim->lookup_table);
+ }
return 0;
}
if (tv[0].tv_nsec != UTIME_OMIT) {
if (tv[0].tv_nsec == UTIME_NOW)
- inode->i_last_access_time = get_wim_timestamp();
+ inode->i_last_access_time = now_as_wim_timestamp();
else
- inode->i_last_access_time = timespec_to_wim_timestamp(tv[0]);
+ inode->i_last_access_time = timespec_to_wim_timestamp(&tv[0]);
}
if (tv[1].tv_nsec != UTIME_OMIT) {
if (tv[1].tv_nsec == UTIME_NOW)
- inode->i_last_write_time = get_wim_timestamp();
+ inode->i_last_write_time = now_as_wim_timestamp();
else
- inode->i_last_write_time = timespec_to_wim_timestamp(tv[1]);
+ inode->i_last_write_time = timespec_to_wim_timestamp(&tv[1]);
}
return 0;
}
if (!inode)
return -errno;
- inode->i_last_access_time = unix_timestamp_to_wim(times->actime);
- inode->i_last_write_time = unix_timestamp_to_wim(times->modtime);
+ inode->i_last_access_time = time_t_to_wim_timestamp(times->actime);
+ inode->i_last_write_time = time_t_to_wim_timestamp(times->modtime);
return 0;
}
#endif /* !HAVE_UTIMENSAT */
/* For read-write mount, check for write access to the WIM. */
if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- ret = can_delete_from_wim(wim);
+ if (!wim->filename)
+ return WIMLIB_ERR_NO_FILENAME;
+ ret = can_modify_wim(wim);
if (ret)
return ret;
}
return WIMLIB_ERR_INVALID_PARAM;
}
- ret = lock_wim_for_append(wim, wim->in_fd.fd);
- if (ret)
- return ret;
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ ret = lock_wim_for_append(wim);
+ if (ret)
+ return ret;
+ }
/* If the user did not specify an interface for accessing named
* data streams, use the default (extended attributes). */
ctx.owner_gid = getgid();
/* Add each stream referenced by files in the image to a list and
- * preemptively double the number of references to each. The latter is
- * done to allow implementing the WIMLIB_UNMOUNT_FLAG_NEW_IMAGE
- * semantics. */
+ * preemptively double the number of references to each. This is done
+ * to allow implementing the WIMLIB_UNMOUNT_FLAG_NEW_IMAGE semantics.
+ */
INIT_LIST_HEAD(&ctx.orig_stream_list);
if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
unsigned i;
char optstring[256] =
"use_ino"
",subtype=wimfs"
- ",attr_timeout=0"
",hard_remove"
",default_permissions"
",kernel_cache"
if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)
delete_staging_dir(&ctx);
out_unlock:
- unlock_wim_for_append(wim, wim->in_fd.fd);
+ unlock_wim_for_append(wim);
return ret;
}
mqd_t mq;
wimlib_progress_func_t progfunc;
void *progctx;
- int status;
};
static void *
struct commit_progress_report report;
ssize_t ret;
- args->status = WIMLIB_ERR_NOT_A_MOUNTPOINT;
for (;;) {
ret = mq_receive(args->mq,
(char *)&report, sizeof(report), NULL);
- if (ret < 0) {
- if (errno == EINTR)
- continue;
- break;
- }
- if (ret == sizeof(int)) {
- args->status = *(int *)&report;
- break;
+ if (ret == sizeof(report)) {
+ call_progress(args->progfunc, report.msg,
+ &report.info, args->progctx);
+ } else {
+ if (ret == 0 || (ret < 0 && errno != EINTR))
+ break;
}
- if (ret < sizeof(report))
- continue;
- call_progress(args->progfunc, report.msg,
- &report.info, args->progctx);
}
return NULL;
}
}
static mqd_t
-create_message_queue(const char *name, bool have_progfunc)
+create_message_queue(const char *name)
{
- bool am_root = (getuid() == 0);
- mode_t umask_save = 0;
- mode_t mode = 0600;
+ bool am_root;
+ mode_t umask_save;
+ mode_t mode;
struct mq_attr attr;
mqd_t mq;
memset(&attr, 0, sizeof(attr));
attr.mq_maxmsg = 8;
- if (have_progfunc)
- attr.mq_msgsize = sizeof(struct commit_progress_report);
- else
- attr.mq_msgsize = sizeof(int);
+ attr.mq_msgsize = sizeof(struct commit_progress_report);
+ am_root = (geteuid() == 0);
if (am_root) {
/* Filesystem mounted as normal user with --allow-other should
* be able to send messages to root user, if they're doing the
* unmount. */
umask_save = umask(0);
mode = 0666;
+ } else {
+ mode = 0600;
}
mq = mq_open(name, O_RDWR | O_CREAT | O_EXCL, mode, &attr);
if (am_root)
return mq;
}
+/* Unmount a read-only or read-write mounted WIM image. */
+static int
+do_unmount(const char *dir)
+{
+ int status;
+ ssize_t len;
+
+ len = getxattr(dir, "wimfs.unmount", &status, sizeof(int));
+ if (len == sizeof(int))
+ return status;
+ else if (len < 0 && (errno == EACCES || errno == EPERM))
+ return WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT;
+ else
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+}
+
+static int
+set_unmount_info(const char *dir, const struct wimfs_unmount_info *unmount_info)
+{
+ if (!setxattr(dir, "wimfs.unmount_info",
+ unmount_info, sizeof(struct wimfs_unmount_info), 0))
+ return 0;
+ else if (errno == EROFS)
+ return 0;
+ else if (errno == EACCES || errno == EPERM)
+ return WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT;
+ else
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+}
+
+static int
+do_unmount_discard(const char *dir)
+{
+ int ret;
+ struct wimfs_unmount_info unmount_info;
+
+ memset(&unmount_info, 0, sizeof(unmount_info));
+
+ ret = set_unmount_info(dir, &unmount_info);
+ if (ret)
+ return ret;
+ return do_unmount(dir);
+}
+
/* Unmount a read-write mounted WIM image, committing the changes. */
static int
do_unmount_commit(const char *dir, int unmount_flags,
memset(&unmount_info, 0, sizeof(unmount_info));
unmount_info.unmount_flags = unmount_flags;
- generate_message_queue_name(unmount_info.mq_name);
- mq = create_message_queue(unmount_info.mq_name, progfunc != NULL);
- if (mq == (mqd_t)-1) {
- ERROR_WITH_ERRNO("Can't create POSIX message queue");
- return WIMLIB_ERR_MQUEUE;
- }
-
- /* The current thread will be stuck in setxattr() until the image is
+ /* The current thread will be stuck in getxattr() until the image is
* committed. Create a thread to handle the progress messages. */
if (progfunc) {
+ generate_message_queue_name(unmount_info.mq_name);
+
+ mq = create_message_queue(unmount_info.mq_name);
+ if (mq == (mqd_t)-1) {
+ ERROR_WITH_ERRNO("Can't create POSIX message queue");
+ return WIMLIB_ERR_MQUEUE;
+ }
args.mq = mq;
args.progfunc = progfunc;
args.progctx = progctx;
unmount_info.unmount_flags |= WIMLIB_UNMOUNT_FLAG_SEND_PROGRESS;
}
- if (!setxattr(dir, "wimfs.unmount",
- (const char *)&unmount_info, sizeof(unmount_info), 0))
- ret = 0;
- else if (errno == EACCES || errno == EPERM)
- ret = WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT;
- else
- ret = WIMLIB_ERR_NOT_A_MOUNTPOINT;
-
+ ret = set_unmount_info(dir, &unmount_info);
+ if (!ret)
+ ret = do_unmount(dir);
if (progfunc) {
- /* Terminate the progress thread and retrieve final unmount
- * status. */
-
- int tmp = -1;
- mq_send(mq, (const char *)&tmp, sizeof(int), 1);
-
+ /* Terminate the progress thread. */
+ char empty[1];
+ mq_send(mq, empty, 0, 1);
pthread_join(commit_progress_tid, NULL);
- if (!ret && args.status != -1)
- ret = args.status;
- } else if (!ret) {
- /* Retrieve the final unmount status. */
-
- int tmp = -1;
- int len;
-
- mq_send(mq, (const char *)&tmp, sizeof(int), 1);
- len = mq_receive(mq, (char *)&tmp, sizeof(int), NULL);
-
- if (len == 4 && tmp != -1)
- ret = tmp;
- else
- ret = WIMLIB_ERR_NOT_A_MOUNTPOINT;
}
out_delete_mq:
- mq_close(mq);
- mq_unlink(unmount_info.mq_name);
+ if (progfunc) {
+ mq_close(mq);
+ mq_unlink(unmount_info.mq_name);
+ }
return ret;
}
-/* Unmount a read-only or read-write mounted WIM image, discarding any changes.
- */
-static int
-do_unmount_discard(const char *dir)
-{
- if (!getxattr(dir, "wimfs.unmount", NULL, 0))
- return 0;
- else if (errno == EACCES || errno == EPERM)
- return WIMLIB_ERR_NOT_PERMITTED_TO_UNMOUNT;
- else
- return WIMLIB_ERR_NOT_A_MOUNTPOINT;
-}
-
static int
begin_unmount(const char *dir, int unmount_flags, int *mount_flags_ret,
wimlib_progress_func_t progfunc, void *progctx)
int mount_flags;
int ret;
- wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
+ ret = wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
+ if (ret)
+ return ret;
if (unmount_flags & ~(WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY |
WIMLIB_UNMOUNT_FLAG_COMMIT |
git://wimlib.net / wimlib / blobdiff