#endif
#include "wimlib.h"
-#include "wimlib/error.h"
#ifdef WITH_FUSE
#ifdef __WIN32__
-# error "FUSE mount not supported on Win32! Please configure --without-fuse"
+# error "FUSE mount not supported on Windows! Please configure --without-fuse"
#endif
-#include "wimlib/encoding.h"
-#include "wimlib/file_io.h"
#include "wimlib/dentry.h"
-#include "wimlib/inode.h"
-#include "wimlib/lookup_table.h"
+#include "wimlib/encoding.h"
#include "wimlib/metadata.h"
#include "wimlib/paths.h"
#include "wimlib/progress.h"
#include "wimlib/reparse.h"
-#include "wimlib/resource.h"
#include "wimlib/timestamp.h"
#include "wimlib/unix_data.h"
-#include "wimlib/version.h"
#include "wimlib/write.h"
#include "wimlib/xml.h"
+#include <dirent.h>
#include <errno.h>
-#include <ftw.h>
#include <limits.h>
#include <mqueue.h>
-#include <signal.h>
+#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
-#include <sys/wait.h>
#include <unistd.h>
#include <utime.h>
#define FUSE_USE_VERSION 26
#include <fuse.h>
-
-#ifdef ENABLE_XATTR
#include <attr/xattr.h>
+
+#ifndef O_NOFOLLOW
+# define O_NOFOLLOW 0 /* Security only... */
#endif
-#define MSG_VERSION_TOO_HIGH -1
-#define MSG_BREAK_LOOP -2
+#define WIMFS_MQUEUE_NAME_LEN 32
+
+#define WIMLIB_UNMOUNT_FLAG_SEND_PROGRESS 0x80000000
+
+struct wimfs_unmount_info {
+ unsigned unmount_flags;
+ char mq_name[WIMFS_MQUEUE_NAME_LEN + 1];
+};
+
+struct commit_progress_report {
+ enum wimlib_progress_msg msg;
+ union wimlib_progress_info info;
+};
-/* File descriptor to a file open on the WIM filesystem. */
+/* Description of an open file on a mounted WIM image. Actually, this
+ * represents the open state of a particular data stream of an inode, rather
+ * than the inode itself. (An inode might have multiple named data streams in
+ * addition to the default, unnamed data stream.) At a given time, an inode in
+ * the WIM image might have multiple file descriptors open to it, each to any
+ * one of its data streams. */
struct wimfs_fd {
+
+ /* Pointer to the inode of this open file.
+ * 'i_num_opened_fds' of the inode tracks the number of file descriptors
+ * that reference it. */
struct wim_inode *f_inode;
+
+ /* Pointer to the lookup table entry for the data stream that has been
+ * opened. 'num_opened_fds' of the lookup table entry tracks the number
+ * of file descriptors that reference it. Or, this value may be NULL,
+ * which indicates that the opened stream is empty and consequently does
+ * not have a lookup table entry. */
struct wim_lookup_table_entry *f_lte;
- struct filedes staging_fd;
- u16 idx;
- u32 stream_id;
+
+ /* If valid (filedes_valid(&f_staging_fd)), this contains the
+ * corresponding native file descriptor for the staging file that has
+ * been created for reading from and/or writing to this open stream. A
+ * single staging file might have multiple file descriptors open to it
+ * simultaneously, each used by a different 'struct wimfs_fd'.
+ *
+ * Or, if invalid (!filedes_valid(&f_staging_fd)), this 'struct
+ * wimfs_fd' is not associated with a staging file. This is permissible
+ * only if this 'struct wimfs_fd' was opened read-only and the stream
+ * has not yet been extracted to a staging file. */
+ struct filedes f_staging_fd;
+
+ /* 0-based index of this file descriptor in the file descriptor table of
+ * its inode. */
+ u16 f_idx;
+
+ /* Unique ID of the opened stream in the inode. This will stay the same
+ * even if the indices of the inode's alternate data streams are changed
+ * by a deletion. */
+ u32 f_stream_id;
};
+#define WIMFS_FD(fi) ((struct wimfs_fd *)(uintptr_t)((fi)->fh))
+
+/* Context structure for a mounted WIM image. */
struct wimfs_context {
- /* The WIMStruct for the mounted WIM. */
+ /* The WIMStruct containing the mounted image. The mounted image is the
+ * currently selected image (wim->current_image). */
WIMStruct *wim;
- /* Name of the staging directory for a read-write mount. Whenever a new file is
- * created, it is done so in the staging directory. Furthermore, whenever a
- * file in the WIM is modified, it is extracted to the staging directory. If
- * changes are commited when the WIM is unmounted, the file resources are merged
- * in from the staging directory when writing the new WIM. */
- char *staging_dir_name;
- size_t staging_dir_name_len;
-
- /* Flags passed to wimlib_mount(). */
+ /* Flags passed to wimlib_mount_image() (WIMLIB_MOUNT_FLAG_*). */
int mount_flags;
- /* Default flags to use when looking up a WIM dentry (depends on whether
- * the Windows interface to alternate data streams is being used or
- * not). */
+ /* Default flags for path lookup in the WIM image. */
int default_lookup_flags;
- /* Next inode number to be assigned. Note: I didn't bother with a
- * bitmap of free inode numbers since this isn't even a "real"
- * filesystem anyway. */
- u64 next_ino;
-
- /* List of inodes in the mounted image */
- struct list_head *image_inode_list;
+ /* Information about the user who has mounted the WIM image */
+ uid_t owner_uid;
+ gid_t owner_gid;
- /* Original list of streams in the mounted image, linked by
- * mount_orig_stream_list. */
- struct list_head orig_stream_list;
+ /* Information about the staging directory for a read-write mount. */
+ int parent_dir_fd;
+ int staging_dir_fd;
+ char *staging_dir_name;
- /* Name and message queue descriptors for message queues between the
- * filesystem daemon process and the unmount process. These are used
- * when the filesystem is unmounted and the process running
- * wimlib_unmount_image() needs to communicate with the filesystem
- * daemon running fuse_main() (i.e. the process created by a call to
- * wimlib_mount_image(). */
- char *unmount_to_daemon_mq_name;
- char *daemon_to_unmount_mq_name;
- mqd_t unmount_to_daemon_mq;
- mqd_t daemon_to_unmount_mq;
+ /* For read-write mounts, the inode number to be assigned to the next
+ * created file. Note: since this isn't a persistent filesystem and we
+ * can re-assign the inode numbers just before mounting the image, it's
+ * good enough to just generate inode numbers sequentially. */
+ u64 next_ino;
- uid_t default_uid;
- gid_t default_gid;
+ /* Number of file descriptors open to the mounted WIM image. */
+ unsigned long num_open_fds;
- int status;
- bool have_status;
+ /* 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;
};
-static void
-init_wimfs_context(struct wimfs_context *ctx)
-{
- memset(ctx, 0, sizeof(*ctx));
- ctx->unmount_to_daemon_mq = (mqd_t)-1;
- ctx->daemon_to_unmount_mq = (mqd_t)-1;
-}
-
#define WIMFS_CTX(fuse_ctx) ((struct wimfs_context*)(fuse_ctx)->private_data)
+/* Retrieve the context structure for the currently mounted WIM image.
+ *
+ * Note: this is a per-thread variable. It is possible for different threads to
+ * mount different images at the same time in the same process, although they
+ * must use different WIMStructs! */
static inline struct wimfs_context *
wimfs_get_context(void)
{
return WIMFS_CTX(fuse_get_context());
}
+static void
+wimfs_inc_num_open_fds(void)
+{
+ wimfs_get_context()->num_open_fds++;
+}
+
+static void
+wimfs_dec_num_open_fds(void)
+{
+ wimfs_get_context()->num_open_fds--;
+}
+
+/* Retrieve the WIMStruct for the currently mounted WIM image. */
static inline WIMStruct *
wimfs_get_WIMStruct(void)
{
return ctx->default_lookup_flags;
}
-/* Returns nonzero if write permission is requested on the file open flags */
-static inline int
+/* Is write permission requested on the file? */
+static inline bool
flags_writable(int open_flags)
{
int accmode = (open_flags & O_ACCMODE);
return (accmode == O_RDWR || accmode == O_WRONLY);
}
+static mode_t
+fuse_mask_mode(mode_t mode, const struct fuse_context *fuse_ctx)
+{
+#if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8)
+ mode &= ~fuse_ctx->umask;
+#endif
+ return mode;
+}
+
/*
- * Allocate a file descriptor for a stream.
+ * Allocate a file descriptor to a data stream in the mounted WIM image.
*
- * @inode: inode containing the stream we're opening
- * @stream_id: ID of the stream we're opening
- * @lte: Lookup table entry for the stream (may be NULL)
- * @fd_ret: Return the allocated file descriptor if successful.
+ * @inode
+ * A pointer to the inode containing the stream being opened.
+ * @stream_id
+ * The ID of the data stream being opened within the inode.
+ * @lte
+ * A pointer to the lookup table entry for the stream data. Or, for a
+ * 0-byte stream, this may be NULL.
+ * @fd_ret
+ * On success, a pointer to the new file descriptor will be stored here.
*
- * Return 0 iff successful or negative error code if unsuccessful.
+ * Returns 0 or a -errno code.
*/
static int
alloc_wimfs_fd(struct wim_inode *inode,
struct wim_lookup_table_entry *lte,
struct wimfs_fd **fd_ret)
{
- static const u16 fds_per_alloc = 8;
+ static const u16 min_fds_per_alloc = 8;
static const u16 max_fds = 0xffff;
-
- DEBUG("Allocating fd for stream ID %u from inode %#"PRIx64" "
- "(open = %u, allocated = %u)",
- stream_id, inode->i_ino, inode->i_num_opened_fds,
- inode->i_num_allocated_fds);
+ u16 i;
+ struct wimfs_fd *fd;
if (inode->i_num_opened_fds == inode->i_num_allocated_fds) {
- struct wimfs_fd **fds;
u16 num_new_fds;
+ struct wimfs_fd **fds;
- if (inode->i_num_allocated_fds == max_fds)
- return -EMFILE;
+ /* Expand this inode's file descriptor table. */
+
+ num_new_fds = max(min_fds_per_alloc,
+ inode->i_num_allocated_fds / 4);
- num_new_fds = min(fds_per_alloc,
+ num_new_fds = min(num_new_fds,
max_fds - inode->i_num_allocated_fds);
+ if (num_new_fds == 0)
+ return -EMFILE;
+
fds = REALLOC(inode->i_fds,
(inode->i_num_allocated_fds + num_new_fds) *
- sizeof(inode->i_fds[0]));
+ sizeof(fds[0]));
if (!fds)
return -ENOMEM;
num_new_fds * sizeof(fds[0]));
inode->i_fds = fds;
inode->i_num_allocated_fds += num_new_fds;
+ inode->i_next_fd = inode->i_num_opened_fds;
}
- for (u16 i = 0; ; i++) {
- if (!inode->i_fds[i]) {
- struct wimfs_fd *fd = CALLOC(1, sizeof(*fd));
- if (!fd)
- return -ENOMEM;
-
- fd->f_inode = inode;
- fd->f_lte = lte;
- filedes_invalidate(&fd->staging_fd);
- fd->idx = i;
- fd->stream_id = stream_id;
- *fd_ret = fd;
- inode->i_fds[i] = fd;
- inode->i_num_opened_fds++;
- if (lte)
- lte->num_opened_fds++;
- DEBUG("Allocated fd (idx = %u)", fd->idx);
- return 0;
- }
- }
+
+ /* Allocate the file descriptor in the first available space in the
+ * inode's file descriptor table.
+ *
+ * i_next_fd is the lower bound on the next open slot. */
+ for (i = inode->i_next_fd; inode->i_fds[i]; i++)
+ ;
+
+ fd = MALLOC(sizeof(*fd));
+ if (!fd)
+ return -ENOMEM;
+
+ fd->f_inode = inode;
+ fd->f_lte = lte;
+ filedes_invalidate(&fd->f_staging_fd);
+ fd->f_idx = i;
+ fd->f_stream_id = stream_id;
+ *fd_ret = fd;
+ inode->i_fds[i] = fd;
+ inode->i_num_opened_fds++;
+ if (lte)
+ lte->num_opened_fds++;
+ wimfs_inc_num_open_fds();
+ inode->i_next_fd = i + 1;
+ return 0;
}
-static void
-inode_put_fd(struct wim_inode *inode, struct wimfs_fd *fd)
+/*
+ * Close a file descriptor to a data stream in the mounted WIM image.
+ *
+ * Returns 0 or a -errno code. The file descriptor is always closed.
+ */
+static int
+close_wimfs_fd(struct wimfs_fd *fd)
{
- wimlib_assert(inode != NULL);
- wimlib_assert(fd->f_inode == inode);
- wimlib_assert(inode->i_num_opened_fds != 0);
- wimlib_assert(fd->idx < inode->i_num_allocated_fds);
- wimlib_assert(inode->i_fds[fd->idx] == fd);
+ int ret = 0;
+ struct wim_inode *inode;
+
+ /* Close the staging file if open. */
+ if (filedes_valid(&fd->f_staging_fd))
+ if (filedes_close(&fd->f_staging_fd))
+ ret = -errno;
+
+ /* Release this file descriptor from its lookup table entry. */
+ if (fd->f_lte)
+ lte_decrement_num_opened_fds(fd->f_lte);
+
+ wimfs_dec_num_open_fds();
- inode->i_fds[fd->idx] = NULL;
+ /* Release this file descriptor from its inode. */
+ inode = fd->f_inode;
+ inode->i_fds[fd->f_idx] = NULL;
+ 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);
}
+ return ret;
}
-static int
-lte_put_fd(struct wim_lookup_table_entry *lte, struct wimfs_fd *fd)
-{
- wimlib_assert(fd->f_lte == lte);
-
- if (!lte) /* Empty stream with no lookup table entry */
- return 0;
-
- /* Close staging file descriptor if needed. */
-
- if (lte->resource_location == RESOURCE_IN_STAGING_FILE
- && filedes_valid(&fd->staging_fd))
- {
- if (filedes_close(&fd->staging_fd)) {
- ERROR_WITH_ERRNO("Failed to close staging file");
- return -errno;
- }
- }
- lte_decrement_num_opened_fds(lte);
- return 0;
-}
-
-/* Close a file descriptor. */
-static int
-close_wimfs_fd(struct wimfs_fd *fd)
+/*
+ * Translate a path into the corresponding inode in the mounted WIM image.
+ *
+ * See get_dentry() for more information.
+ *
+ * Returns a pointer to the resulting inode, or NULL with errno set.
+ */
+static struct wim_inode *
+wim_pathname_to_inode(WIMStruct *wim, const char *path)
{
- int ret;
- DEBUG("Closing fd (ino = %#"PRIx64", opened = %u, allocated = %u)",
- fd->f_inode->i_ino, fd->f_inode->i_num_opened_fds,
- fd->f_inode->i_num_allocated_fds);
- ret = lte_put_fd(fd->f_lte, fd);
- if (ret)
- return ret;
-
- inode_put_fd(fd->f_inode, fd);
- return 0;
-}
+ struct wim_dentry *dentry;
-static mode_t
-fuse_mask_mode(mode_t mode, struct fuse_context *fuse_ctx)
-{
-#if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8)
- mode &= ~fuse_ctx->umask;
-#endif
- return mode;
+ dentry = get_dentry(wim, path, WIMLIB_CASE_SENSITIVE);
+ if (!dentry)
+ return NULL;
+ return dentry->d_inode;
}
/*
- * Add a new dentry with a new inode to a WIM image.
+ * Create a new file in the mounted WIM image.
*
- * Returns 0 on success, or negative error number on failure.
+ * @fuse_ctx
+ * The FUSE context for the mounted image.
+ * @path
+ * The path at which to create the first link to the new file. If a file
+ * already exists at this path, -EEXIST is returned.
+ * @mode
+ * The UNIX mode for the new file. This is only honored if
+ * WIMLIB_MOUNT_FLAG_UNIX_DATA was passed to wimlib_mount_image().
+ * @rdev
+ * The device ID for the new file, encoding the major and minor device
+ * numbers. This is only honored if WIMLIB_MOUNT_FLAG_UNIX_DATA was passed
+ * to wimlib_mount_image().
+ * @attributes
+ * Windows file attributes to use for the new file.
+ * @dentry_ret
+ * On success, a pointer to the new dentry is returned here. Its d_inode
+ * member will point to the new inode that was created for it and added to
+ * the mounted WIM image.
+ *
+ * Returns 0 or a -errno code.
*/
static int
create_dentry(struct fuse_context *fuse_ctx, const char *path,
- mode_t mode, dev_t rdev, int attributes,
+ mode_t mode, dev_t rdev, u32 attributes,
struct wim_dentry **dentry_ret)
{
+ struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
struct wim_dentry *parent;
- struct wim_dentry *new;
const char *basename;
- struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
- int ret;
+ struct wim_dentry *new_dentry;
+ struct wim_inode *new_inode;
parent = get_parent_dentry(wimfs_ctx->wim, path, WIMLIB_CASE_SENSITIVE);
if (!parent)
return -ENOTDIR;
basename = path_basename(path);
+
if (get_dentry_child_with_name(parent, basename, WIMLIB_CASE_SENSITIVE))
return -EEXIST;
- ret = new_dentry_with_inode(basename, &new);
- if (ret)
+ if (new_dentry_with_inode(basename, &new_dentry))
return -ENOMEM;
- new->d_inode->i_resolved = 1;
- new->d_inode->i_ino = wimfs_ctx->next_ino++;
- new->d_inode->i_attributes = attributes;
+ new_inode = new_dentry->d_inode;
+
+ new_inode->i_resolved = 1;
+ new_inode->i_ino = wimfs_ctx->next_ino++;
+ new_inode->i_attributes = attributes;
if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA) {
struct wimlib_unix_data unix_data;
unix_data.gid = fuse_ctx->gid;
unix_data.mode = fuse_mask_mode(mode, fuse_ctx);
unix_data.rdev = rdev;
-
- if (!inode_set_unix_data(new->d_inode, &unix_data,
- UNIX_DATA_ALL))
+ if (!inode_set_unix_data(new_inode, &unix_data, UNIX_DATA_ALL))
{
- free_dentry(new);
+ free_dentry(new_dentry);
return -ENOMEM;
}
}
- dentry_add_child(parent, new);
- list_add_tail(&new->d_inode->i_list, wimfs_ctx->image_inode_list);
+
+ list_add_tail(&new_inode->i_list,
+ &wim_get_current_image_metadata(wimfs_ctx->wim)->inode_list);
+
+ dentry_add_child(parent, new_dentry);
+
if (dentry_ret)
- *dentry_ret = new;
+ *dentry_ret = new_dentry;
return 0;
}
-static struct wim_inode *
-wim_pathname_to_inode(WIMStruct *wim, const tchar *path)
-{
- struct wim_dentry *dentry;
- dentry = get_dentry(wim, path, WIMLIB_CASE_SENSITIVE);
- if (dentry)
- return dentry->d_inode;
- else
- return NULL;
-}
-
/*
- * Remove a dentry from a mounted WIM image; i.e. remove an alias for an inode.
+ * Remove a dentry from the mounted WIM image; i.e. remove an alias for an
+ * inode.
*/
static void
remove_dentry(struct wim_dentry *dentry,
struct wim_lookup_table *lookup_table)
{
- /* Put a reference to each stream the inode contains. */
+ /* Drop the reference to each stream the inode contains. */
inode_unref_streams(dentry->d_inode, lookup_table);
/* Unlink the dentry from the image's dentry tree. */
unlink_dentry(dentry);
/* Delete the dentry. This will also decrement the link count of the
- * corresponding inode. */
+ * corresponding inode, and possibly cause it to be deleted as well. */
free_dentry(dentry);
}
+/* Generate UNIX filetype mode bits for the specified WIM inode, based on its
+ * Windows file attributes. */
static mode_t
inode_unix_file_type(const struct wim_inode *inode)
{
return S_IFREG;
}
+/* Generate a default UNIX mode for the specified WIM inode. */
static mode_t
inode_default_unix_mode(const struct wim_inode *inode)
{
return inode_unix_file_type(inode) | 0777;
}
-/* Transfers file attributes from a struct wim_inode to a `stat' buffer.
+/*
+ * Retrieve standard UNIX metadata ('struct stat') for a WIM inode.
*
- * The lookup table entry tells us which stream in the inode we are statting.
- * For a named data stream, everything returned is the same as the unnamed data
- * stream except possibly the size and block count. */
+ * @lte specifies the stream of the inode that is being queried. We mostly
+ * return the same information for all streams, but st_size and st_blocks may be
+ * different for different streams.
+ *
+ * This always returns 0.
+ */
static int
inode_to_stbuf(const struct wim_inode *inode,
const struct wim_lookup_table_entry *lte,
if ((ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA) &&
inode_get_unix_data(inode, &unix_data))
{
+ /* Use the user ID, group ID, mode, and device ID from the
+ * inode's extra UNIX metadata information. */
stbuf->st_uid = unix_data.uid;
stbuf->st_gid = unix_data.gid;
stbuf->st_mode = unix_data.mode;
stbuf->st_rdev = unix_data.rdev;
} else {
- stbuf->st_uid = ctx->default_uid;
- stbuf->st_gid = ctx->default_gid;
+ /* Generate default values for the user ID, group ID, and mode.
+ *
+ * Note: in the case of an allow_other mount, fuse_context.uid
+ * may not be the same as wimfs_context.owner_uid! */
+ stbuf->st_uid = ctx->owner_uid;
+ stbuf->st_gid = ctx->owner_gid;
stbuf->st_mode = inode_default_unix_mode(inode);
- stbuf->st_rdev = 0;
}
- stbuf->st_ino = (ino_t)inode->i_ino;
+ stbuf->st_ino = inode->i_ino;
stbuf->st_nlink = inode->i_nlink;
if (lte)
stbuf->st_size = lte->size;
- else
- stbuf->st_size = 0;
#ifdef HAVE_STAT_NANOSECOND_PRECISION
stbuf->st_atim = wim_timestamp_to_timespec(inode->i_last_access_time);
stbuf->st_mtim = wim_timestamp_to_timespec(inode->i_last_write_time);
return 0;
}
+/* Update the last access and last write timestamps of a WIM inode. */
static void
touch_inode(struct wim_inode *inode)
{
inode->i_last_write_time = now;
}
-/* Creates a new staging file and returns its file descriptor opened for
- * writing.
- *
- * @name_ret: A location into which the a pointer to the newly allocated name of
- * the staging file is stored.
+/*
+ * Create a new file in the staging directory for a read-write mounted image.
*
- * @ctx: Context for the WIM filesystem; this provides the name of the
- * staging directory.
+ * On success, returns the file descriptor for the new staging file, opened for
+ * writing. In addition, stores the allocated name of the staging file in
+ * @name_ret.
*
- * On success, returns the file descriptor for the staging file, opened for
- * writing. On failure, returns -1 and sets errno.
+ * On failure, returns -1 and sets errno.
*/
static int
-create_staging_file(char **name_ret, struct wimfs_context *ctx)
+create_staging_file(const struct wimfs_context *ctx, char **name_ret)
{
- size_t name_len;
- char *name;
- struct stat stbuf;
- int fd;
- int errno_save;
static const size_t STAGING_FILE_NAME_LEN = 20;
+ char *name;
+ int fd;
- name_len = ctx->staging_dir_name_len + 1 + STAGING_FILE_NAME_LEN;
- name = MALLOC(name_len + 1);
- if (!name) {
- errno = ENOMEM;
- return -1;
- }
-
- do {
-
- memcpy(name, ctx->staging_dir_name, ctx->staging_dir_name_len);
- name[ctx->staging_dir_name_len] = '/';
- randomize_char_array_with_alnum(name + ctx->staging_dir_name_len + 1,
- STAGING_FILE_NAME_LEN);
- name[name_len] = '\0';
-
-
- /* Just in case, verify that the randomly generated name doesn't name an
- * existing file, and try again if so */
- } while (stat(name, &stbuf) == 0);
-
- if (errno != ENOENT) /* other error?! */
+ name = MALLOC(STAGING_FILE_NAME_LEN + 1);
+ if (!name)
return -1;
-
- /* doesn't exist--- ok */
-
- DEBUG("Creating staging file `%s'", name);
-
- fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0600);
- if (fd == -1) {
- errno_save = errno;
+ name[STAGING_FILE_NAME_LEN] = '\0';
+
+retry:
+ randomize_char_array_with_alnum(name, STAGING_FILE_NAME_LEN);
+ fd = openat(ctx->staging_dir_fd, name,
+ O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW, 0600);
+ if (unlikely(fd < 0)) {
+ if (unlikely(errno == EEXIST))
+ /* Try again with another name. */
+ goto retry;
FREE(name);
- errno = errno_save;
} else {
*name_ret = name;
}
/*
* Extract a WIM resource to the staging directory.
+ * This is necessary if a stream using the resource is being opened for writing.
*
- * @inode: Inode that contains the stream we are extracting
+ * @inode
+ * The inode containing the stream being opened for writing.
*
- * @stream_id: Identifier for the stream (it stays constant even if the indices
- * of the stream entries are changed)
+ * @stream_idx
+ * The index of the stream in @inode being opened for writing.
*
- * @lte: Pointer to pointer to the lookup table entry for the stream we need to
- * extract, or NULL if there was no lookup table entry present for the stream
+ * @lte_ptr
+ * *lte_ptr is the lookup table entry for the stream being extracted, or
+ * NULL if the stream does not have a lookup table entry (which is possible
+ * if the stream is empty). On success, *lte_ptr will be set to point to a
+ * lookup table entry that represents the resource in its new location in a
+ * staging file. This may be the same as the old entry in the case that it
+ * was reused, or it may be a new entry.
*
- * @size: Number of bytes of the stream we want to extract (this supports the
- * wimfs_truncate() function). It may be more than the actual stream length, in
- * which case the extra space is filled with zeroes.
+ * @size
+ * Number of bytes of the stream to extract and include in the staging file
+ * resource. It may be less than the actual stream length, in which case
+ * only a prefix of the resource will be extracted. It may also be more
+ * than the actual stream length, in which case the extra space will be
+ * zero-filled.
*
- * @ctx: Context for the WIM filesystem.
- *
- * Returns 0 on success or a negative error code on failure.
+ * Returns 0 or a -errno code.
*/
static int
extract_resource_to_staging_dir(struct wim_inode *inode,
- u32 stream_id,
- struct wim_lookup_table_entry **lte,
+ u16 stream_idx,
+ struct wim_lookup_table_entry **lte_ptr,
off_t size,
- struct wimfs_context *ctx)
+ const struct wimfs_context *ctx)
{
+ struct wim_lookup_table_entry *old_lte;
+ struct wim_lookup_table_entry *new_lte;
char *staging_file_name;
- int ret;
- int fd;
- struct wim_lookup_table_entry *old_lte, *new_lte;
+ int staging_fd;
off_t extract_size;
+ int result;
+ u32 stream_id;
+ int ret;
- DEBUG("Extracting resource to staging dir: inode %"PRIu64", "
- "stream id %"PRIu32, inode->i_ino, stream_id);
-
- old_lte = *lte;
-
- wimlib_assert(old_lte == NULL ||
- old_lte->resource_location != RESOURCE_IN_STAGING_FILE);
+ old_lte = *lte_ptr;
- /* Create the staging file */
- fd = create_staging_file(&staging_file_name, ctx);
- if (fd == -1)
+ /* Create the staging file. */
+ staging_fd = create_staging_file(ctx, &staging_file_name);
+ if (unlikely(staging_fd < 0))
return -errno;
- /* Extract the stream to the staging file (possibly truncated) */
+ /* Extract the stream to the staging file (possibly truncated). */
if (old_lte) {
- struct filedes wimlib_fd;
- filedes_init(&wimlib_fd, fd);
+ struct filedes fd;
+
+ filedes_init(&fd, staging_fd);
+ errno = 0;
extract_size = min(old_lte->size, size);
- ret = extract_stream_to_fd(old_lte, &wimlib_fd, extract_size);
+ result = extract_stream_to_fd(old_lte, &fd, extract_size);
} else {
- ret = 0;
extract_size = 0;
+ result = 0;
}
/* In the case of truncate() to more than the file length, extend the
- * file with zeroes by calling ftruncate() on the underlying staging
- * file */
- if (ret == 0 && size > extract_size)
- ret = ftruncate(fd, size);
-
- /* Close the staging file descriptor and check for errors. If there's
- * an error, unlink the staging file. */
- if (ret != 0 || close(fd) != 0) {
- if (errno != 0)
- ret = -errno;
- else
- ret = -EIO;
- close(fd);
+ * staging file with zeroes by calling ftruncate(). */
+ if (!result && size > extract_size)
+ result = ftruncate(staging_fd, size);
+
+ /* Close the staging file. */
+ if (close(staging_fd))
+ result = -1;
+
+ /* If an error occurred, unlink the staging file. */
+ if (unlikely(result)) {
+ /* extract_stream_to_fd() should set errno, but if it didn't,
+ * set a default value. */
+ ret = errno ? -errno : -EIO;
goto out_delete_staging_file;
}
/* Now deal with the lookup table entries. We may be able to re-use the
- * existing entry, but we may have to create a new one instead. */
+ * existing entry, but we may have to create a new one instead. */
+
+ stream_id = inode_stream_idx_to_id(inode, stream_idx);
if (old_lte && inode->i_nlink == old_lte->refcnt) {
/* The reference count of the existing lookup table entry is the
* same as the link count of the inode that contains the stream
- * we're opening. Therefore, ALL the references to the lookup
+ * we're opening. Therefore, all the references to the lookup
* table entry correspond to the stream we're trying to extract,
* so the lookup table entry can be re-used. */
- DEBUG("Re-using lookup table entry");
lookup_table_unlink(ctx->wim->lookup_table, old_lte);
+ lte_put_resource(old_lte);
new_lte = old_lte;
} else {
- if (old_lte) {
- /* There's an existing lookup table entry, but its
- * reference count is greater than the link count for
- * the inode containing a stream we're opening.
- * Therefore, we need to split the lookup table entry.
- */
- wimlib_assert(old_lte->refcnt > inode->i_nlink);
- DEBUG("Splitting lookup table entry "
- "(inode->i_nlink = %u, old_lte->refcnt = %u)",
- inode->i_nlink, old_lte->refcnt);
- }
+ /* We need to split the old lookup table entry because it also
+ * has other references. Or, there was no old lookup table
+ * entry, so we need to create a new one anyway. */
new_lte = new_lookup_table_entry();
- if (!new_lte) {
+ if (unlikely(!new_lte)) {
ret = -ENOMEM;
goto out_delete_staging_file;
}
* At the same time, we need to count the number of these opened
* file descriptors to the new lookup table entry. If there's
* an old lookup table entry, this number needs to be subtracted
- * from the fd's opened to the old entry. */
+ * from the fd's opened to the old entry. */
for (u16 i = 0, j = 0; j < inode->i_num_opened_fds; i++) {
- struct wimfs_fd *fd = inode->i_fds[i];
- if (fd) {
- if (fd->stream_id == stream_id) {
- int raw_fd;
-
- wimlib_assert(fd->f_lte == old_lte);
- wimlib_assert(!filedes_valid(&fd->staging_fd));
- fd->f_lte = new_lte;
- new_lte->num_opened_fds++;
- raw_fd = open(staging_file_name, O_RDONLY);
- if (raw_fd < 0) {
- ret = -errno;
- goto out_revert_fd_changes;
- }
- filedes_init(&fd->staging_fd, raw_fd);
- }
- j++;
+ struct wimfs_fd *fd;
+ int raw_fd;
+
+ fd = inode->i_fds[i];
+ if (!fd)
+ continue;
+
+ j++;
+
+ if (fd->f_stream_id != stream_id)
+ continue;
+
+ /* This is a readonly fd for the same stream. */
+ fd->f_lte = new_lte;
+ new_lte->num_opened_fds++;
+ raw_fd = openat(ctx->staging_dir_fd, staging_file_name,
+ O_RDONLY | O_NOFOLLOW);
+ if (unlikely(raw_fd < 0)) {
+ ret = -errno;
+ goto out_revert_fd_changes;
}
+ filedes_init(&fd->f_staging_fd, raw_fd);
}
- DEBUG("%hu fd's were already opened to the file we extracted",
- new_lte->num_opened_fds);
if (old_lte) {
old_lte->num_opened_fds -= new_lte->num_opened_fds;
old_lte->refcnt -= inode->i_nlink;
}
}
- lte_put_resource(new_lte);
- new_lte->refcnt = inode->i_nlink;
- new_lte->resource_location = RESOURCE_IN_STAGING_FILE;
- new_lte->staging_file_name = staging_file_name;
- new_lte->size = size;
+ new_lte->refcnt = inode->i_nlink;
+ new_lte->resource_location = RESOURCE_IN_STAGING_FILE;
+ new_lte->staging_file_name = staging_file_name;
+ new_lte->staging_dir_fd = ctx->staging_dir_fd;
+ new_lte->size = size;
add_unhashed_stream(new_lte, inode, stream_id,
&wim_get_current_image_metadata(ctx->wim)->unhashed_streams);
- *retrieve_lte_pointer(new_lte) = new_lte;
- *lte = new_lte;
+ if (stream_idx == 0)
+ inode->i_lte = new_lte;
+ else
+ inode->i_ads_entries[stream_idx - 1].lte = new_lte;
+ *lte_ptr = new_lte;
return 0;
+
out_revert_fd_changes:
- for (u16 i = 0, j = 0; j < new_lte->num_opened_fds; i++) {
+ for (u16 i = 0; new_lte->num_opened_fds; i++) {
struct wimfs_fd *fd = inode->i_fds[i];
- if (fd && fd->stream_id == stream_id && fd->f_lte == new_lte) {
+ if (fd && fd->f_stream_id == stream_id) {
fd->f_lte = old_lte;
- if (filedes_valid(&fd->staging_fd)) {
- filedes_close(&fd->staging_fd);
- filedes_invalidate(&fd->staging_fd);
+ if (filedes_valid(&fd->f_staging_fd)) {
+ filedes_close(&fd->f_staging_fd);
+ filedes_invalidate(&fd->f_staging_fd);
}
- j++;
+ new_lte->num_opened_fds--;
}
}
free_lookup_table_entry(new_lte);
out_delete_staging_file:
- unlink(staging_file_name);
+ unlinkat(ctx->staging_dir_fd, staging_file_name, 0);
FREE(staging_file_name);
return ret;
}
/*
- * Creates a randomly named staging directory and saves its name in the
- * filesystem context structure.
+ * Create the staging directory for the WIM file.
+ *
+ * The staging directory will be created in the directory specified by the open
+ * file descriptor @parent_dir_fd. It will be given a randomly generated name
+ * based on @wim_basename, the name of the WIM file.
+ *
+ * On success, returns a file descriptor to the open staging directory with
+ * O_RDONLY access. In addition, stores the allocated name of the staging
+ * directory (relative to @parent_dir_fd) in @staging_dir_name_ret.
+ * On failure, returns -1 and sets errno.
*/
static int
-make_staging_dir(struct wimfs_context *ctx, const char *user_prefix)
+make_staging_dir_at(int parent_dir_fd, const char *wim_basename,
+ char **staging_dir_name_ret)
{
+ static const char common_suffix[8] = ".staging";
static const size_t random_suffix_len = 10;
- static const char *common_suffix = ".staging";
- static const size_t common_suffix_len = 8;
-
- char *staging_dir_name = NULL;
+ size_t wim_basename_len;
size_t staging_dir_name_len;
- size_t prefix_len;
- const char *wim_basename;
- char *real_user_prefix = NULL;
- int ret;
-
- if (user_prefix) {
- real_user_prefix = realpath(user_prefix, NULL);
- if (!real_user_prefix) {
- ERROR_WITH_ERRNO("Could not resolve `%s'",
- real_user_prefix);
- ret = WIMLIB_ERR_NOTDIR;
- goto out;
- }
- wim_basename = path_basename(ctx->wim->filename);
- prefix_len = strlen(real_user_prefix) + 1 + strlen(wim_basename);
- } else {
- prefix_len = strlen(ctx->wim->filename);
- }
-
- staging_dir_name_len = prefix_len + common_suffix_len + random_suffix_len;
+ char *staging_dir_name;
+ char *p;
+ int fd;
+ wim_basename_len = strlen(wim_basename);
+ staging_dir_name_len = wim_basename_len + sizeof(common_suffix) +
+ random_suffix_len;
staging_dir_name = MALLOC(staging_dir_name_len + 1);
- if (!staging_dir_name) {
- ret = WIMLIB_ERR_NOMEM;
- goto out;
- }
-
- if (real_user_prefix)
- sprintf(staging_dir_name, "%s/%s", real_user_prefix, wim_basename);
- else
- strcpy(staging_dir_name, ctx->wim->filename);
+ if (!staging_dir_name)
+ return -1;
- strcat(staging_dir_name, common_suffix);
+ p = staging_dir_name;
+ p = mempcpy(p, wim_basename, wim_basename_len);
+ p = mempcpy(p, common_suffix, sizeof(common_suffix));
+ randomize_char_array_with_alnum(p, random_suffix_len);
+ p += random_suffix_len;
+ *p = '\0';
- randomize_char_array_with_alnum(staging_dir_name + prefix_len + common_suffix_len,
- random_suffix_len);
+ if (mkdirat(parent_dir_fd, staging_dir_name, 0700))
+ goto err1;
- staging_dir_name[staging_dir_name_len] = '\0';
+ fd = openat(parent_dir_fd, staging_dir_name,
+ O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
+ if (fd < 0)
+ goto err2;
- if (mkdir(staging_dir_name, 0700) != 0) {
- ERROR_WITH_ERRNO("Failed to create temporary directory `%s'",
- staging_dir_name);
- ret = WIMLIB_ERR_MKDIR;
- } else {
- ret = 0;
- }
-out:
- FREE(real_user_prefix);
- if (ret == 0) {
- ctx->staging_dir_name = staging_dir_name;
- ctx->staging_dir_name_len = staging_dir_name_len;
- } else {
- FREE(staging_dir_name);
- }
- return ret;
-}
+ *staging_dir_name_ret = staging_dir_name;
+ return fd;
-static int
-remove_file_or_directory(const char *fpath, const struct stat *sb,
- int typeflag, struct FTW *ftwbuf)
-{
- if (remove(fpath) == 0)
- return 0;
- else {
- ERROR_WITH_ERRNO("Cannot remove `%s'", fpath);
- return WIMLIB_ERR_DELETE_STAGING_DIR;
- }
+err2:
+ unlinkat(parent_dir_fd, staging_dir_name, AT_REMOVEDIR);
+err1:
+ FREE(staging_dir_name);
+ return -1;
}
/*
- * Deletes the staging directory and all the files contained in it.
+ * Create the staging directory and set ctx->staging_dir_fd,
+ * ctx->staging_dir_name, and ctx->parent_dir_fd.
*/
static int
-delete_staging_dir(struct wimfs_context *ctx)
+make_staging_dir(struct wimfs_context *ctx, const char *parent_dir_path)
{
+ const char *wim_basename;
+ char *end = NULL;
int ret;
- ret = nftw(ctx->staging_dir_name, remove_file_or_directory,
- 10, FTW_DEPTH);
- FREE(ctx->staging_dir_name);
- ctx->staging_dir_name = NULL;
- return ret;
-}
-static int
-inode_close_fds(struct wim_inode *inode)
-{
- u16 num_opened_fds = inode->i_num_opened_fds;
- for (u16 i = 0, j = 0; j < num_opened_fds; i++) {
- struct wimfs_fd *fd = inode->i_fds[i];
- if (fd) {
- wimlib_assert(fd->f_inode == inode);
- int ret = close_wimfs_fd(fd);
- if (ret != 0)
- return ret;
- j++;
+ wim_basename = path_basename(ctx->wim->filename);
+
+ if (!parent_dir_path) {
+ /* The user did not specify a directory. Default to creating
+ * the staging directory alongside the WIM file. */
+ if (wim_basename > ctx->wim->filename) {
+ parent_dir_path = ctx->wim->filename;
+ end = (char *)(wim_basename - 1);
+ /* *end must be a slash. Temporarily overwrite it so we
+ * can open the parent directory. */
+ *end = '\0';
+ } else {
+ parent_dir_path = ".";
}
}
- return 0;
-}
-
-/* Overwrites the WIM file, with changes saved. */
-static int
-rebuild_wim(struct wimfs_context *ctx, int write_flags)
-{
- int ret;
- struct wim_lookup_table_entry *lte, *tmp;
- WIMStruct *wim = ctx->wim;
- struct wim_image_metadata *imd = wim_get_current_image_metadata(ctx->wim);
- DEBUG("Closing all staging file descriptors.");
- image_for_each_unhashed_stream_safe(lte, tmp, imd) {
- ret = inode_close_fds(lte->back_inode);
- if (ret)
- return ret;
+ /* Open the parent directory (in which we'll create our staging
+ * directory). */
+ ctx->parent_dir_fd = open(parent_dir_path, O_RDONLY | O_DIRECTORY);
+ if (ctx->parent_dir_fd < 0) {
+ ERROR_WITH_ERRNO("Can't open directory \"%s\"",
+ parent_dir_path);
+ ret = WIMLIB_ERR_OPENDIR;
+ goto out_restore_wim_filename;
}
- DEBUG("Freeing entries for zero-length streams");
- image_for_each_unhashed_stream_safe(lte, tmp, imd) {
- wimlib_assert(lte->unhashed);
- if (lte->size == 0) {
- struct wim_lookup_table_entry **back_ptr;
- back_ptr = retrieve_lte_pointer(lte);
- *back_ptr = NULL;
- list_del(<e->unhashed_list);
- free_lookup_table_entry(lte);
- }
+ ctx->staging_dir_fd = make_staging_dir_at(ctx->parent_dir_fd,
+ wim_basename,
+ &ctx->staging_dir_name);
+ if (ctx->staging_dir_fd < 0) {
+ ERROR_WITH_ERRNO("Can't create staging directory in \"%s\"",
+ parent_dir_path);
+ close(ctx->parent_dir_fd);
+ ret = WIMLIB_ERR_MKDIR;
+ goto out_restore_wim_filename;
}
-
- xml_update_image_info(wim, wim->current_image);
- ret = wimlib_overwrite(wim, write_flags, 0);
- if (ret)
- ERROR("Failed to commit changes to mounted WIM image");
+ ret = 0;
+out_restore_wim_filename:
+ if (end)
+ *end = '/';
return ret;
}
-/* Simple function that returns the concatenation of 2 strings. */
-static char *
-strcat_dup(const char *s1, const char *s2, size_t max_len)
+/* Deletes the staging directory, undoing the effects of a succesful call to
+ * make_staging_dir(). */
+static void
+delete_staging_dir(struct wimfs_context *ctx)
{
- size_t len = strlen(s1) + strlen(s2);
- if (len > max_len)
- len = max_len;
- char *p = MALLOC(len + 1);
- if (!p)
- return NULL;
- snprintf(p, len + 1, "%s%s", s1, s2);
- return p;
+ DIR *dir;
+ struct dirent *ent;
+
+ dir = fdopendir(ctx->staging_dir_fd);
+ if (dir) {
+ while ((ent = readdir(dir)))
+ unlinkat(ctx->staging_dir_fd, ent->d_name, 0);
+ closedir(dir);
+ } else {
+ close(ctx->staging_dir_fd);
+ }
+ if (unlinkat(ctx->parent_dir_fd, ctx->staging_dir_name, AT_REMOVEDIR))
+ WARNING_WITH_ERRNO("Could not delete staging directory");
+ FREE(ctx->staging_dir_name);
+ close(ctx->parent_dir_fd);
}
-static int
-set_message_queue_names(struct wimfs_context *ctx, const char *mount_dir)
+static void
+reassign_inode_numbers(struct wimfs_context *ctx)
{
- static const char *u2d_prefix = "/wimlib-unmount-to-daemon-mq";
- static const char *d2u_prefix = "/wimlib-daemon-to-unmount-mq";
- char *dir_path;
- char *p;
- int ret;
-
- dir_path = realpath(mount_dir, NULL);
- if (!dir_path) {
- ERROR_WITH_ERRNO("Failed to resolve path \"%s\"", mount_dir);
- if (errno == ENOMEM)
- return WIMLIB_ERR_NOMEM;
- else
- return WIMLIB_ERR_NOTDIR;
- }
+ struct wim_image_metadata *imd;
+ struct wim_inode *inode;
- for (p = dir_path; *p; p++)
- if (*p == '/')
- *p = 0xff;
-
- ctx->unmount_to_daemon_mq_name = strcat_dup(u2d_prefix, dir_path,
- NAME_MAX);
- if (!ctx->unmount_to_daemon_mq_name) {
- ret = WIMLIB_ERR_NOMEM;
- goto out_free_dir_path;
- }
- ctx->daemon_to_unmount_mq_name = strcat_dup(d2u_prefix, dir_path,
- NAME_MAX);
- if (!ctx->daemon_to_unmount_mq_name) {
- ret = WIMLIB_ERR_NOMEM;
- goto out_free_unmount_to_daemon_mq_name;
- }
-
- ret = 0;
- goto out_free_dir_path;
-out_free_unmount_to_daemon_mq_name:
- FREE(ctx->unmount_to_daemon_mq_name);
- ctx->unmount_to_daemon_mq_name = NULL;
-out_free_dir_path:
- FREE(dir_path);
- return ret;
-}
+ ctx->next_ino = 1;
+ imd = wim_get_current_image_metadata(ctx->wim);
+ image_for_each_inode(inode, imd)
+ inode->i_ino = ctx->next_ino++;
+}
static void
-free_message_queue_names(struct wimfs_context *ctx)
-{
- FREE(ctx->unmount_to_daemon_mq_name);
- FREE(ctx->daemon_to_unmount_mq_name);
- ctx->unmount_to_daemon_mq_name = NULL;
- ctx->daemon_to_unmount_mq_name = NULL;
-}
-
-/*
- * Opens two POSIX message queue: one for sending messages from the unmount
- * process to the daemon process, and one to go the other way. The names of the
- * message queues, which must be system-wide unique, are be based on the mount
- * point.
- *
- * @daemon specifies whether the calling process is the filesystem daemon or the
- * unmount process.
- */
-static int
-open_message_queues(struct wimfs_context *ctx, bool daemon)
-{
- int unmount_to_daemon_mq_flags = O_WRONLY | O_CREAT;
- int daemon_to_unmount_mq_flags = O_RDONLY | O_CREAT;
- mode_t mode;
- mode_t orig_umask;
- int ret;
-
- if (daemon) {
- swap(unmount_to_daemon_mq_flags, daemon_to_unmount_mq_flags);
- mode = 0600;
- } else {
- mode = 0666;
- }
-
- orig_umask = umask(0000);
- DEBUG("Opening message queue \"%s\"", ctx->unmount_to_daemon_mq_name);
- ctx->unmount_to_daemon_mq = mq_open(ctx->unmount_to_daemon_mq_name,
- unmount_to_daemon_mq_flags, mode, NULL);
-
- if (ctx->unmount_to_daemon_mq == (mqd_t)-1) {
- ERROR_WITH_ERRNO("mq_open()");
- ret = WIMLIB_ERR_MQUEUE;
- goto out;
- }
-
- DEBUG("Opening message queue \"%s\"", ctx->daemon_to_unmount_mq_name);
- ctx->daemon_to_unmount_mq = mq_open(ctx->daemon_to_unmount_mq_name,
- daemon_to_unmount_mq_flags, mode, NULL);
-
- if (ctx->daemon_to_unmount_mq == (mqd_t)-1) {
- ERROR_WITH_ERRNO("mq_open()");
- mq_close(ctx->unmount_to_daemon_mq);
- mq_unlink(ctx->unmount_to_daemon_mq_name);
- ctx->unmount_to_daemon_mq = (mqd_t)-1;
- ret = WIMLIB_ERR_MQUEUE;
- goto out;
- }
- ret = 0;
-out:
- umask(orig_umask);
- return ret;
-}
-
-/* Try to determine the maximum message size of a message queue. The return
- * value is the maximum message size, or a guess of 8192 bytes if it cannot be
- * determined. */
-static long
-mq_get_msgsize(mqd_t mq)
-{
- static const char *msgsize_max_file = "/proc/sys/fs/mqueue/msgsize_max";
- FILE *fp;
- struct mq_attr attr;
- long msgsize;
-
- if (mq_getattr(mq, &attr) == 0) {
- msgsize = attr.mq_msgsize;
- } else {
- ERROR_WITH_ERRNO("mq_getattr()");
- ERROR("Attempting to read %s", msgsize_max_file);
- fp = fopen(msgsize_max_file, "rb");
- if (fp) {
- if (fscanf(fp, "%ld", &msgsize) != 1) {
- ERROR("Assuming message size of 8192");
- msgsize = 8192;
- }
- fclose(fp);
- } else {
- ERROR_WITH_ERRNO("Failed to open the file `%s'",
- msgsize_max_file);
- ERROR("Assuming message size of 8192");
- msgsize = 8192;
- }
- }
- return msgsize;
-}
-
-static int
-get_mailbox(mqd_t mq, long needed_msgsize, long *msgsize_ret,
- void **mailbox_ret)
+release_extra_refcnts(struct wimfs_context *ctx)
{
- long msgsize;
- void *mailbox;
-
- msgsize = mq_get_msgsize(mq);
-
- if (msgsize < needed_msgsize) {
- ERROR("Message queue max size must be at least %ld!",
- needed_msgsize);
- return WIMLIB_ERR_MQUEUE;
- }
+ struct list_head *list = &ctx->orig_stream_list;
+ struct wim_lookup_table *lookup_table = ctx->wim->lookup_table;
+ struct wim_lookup_table_entry *lte, *tmp;
- mailbox = MALLOC(msgsize);
- if (!mailbox) {
- ERROR("Failed to allocate %ld bytes for mailbox", msgsize);
- return WIMLIB_ERR_NOMEM;
+ list_for_each_entry_safe(lte, tmp, list, orig_stream_list) {
+ u32 n = lte->out_refcnt;
+ while (n--)
+ lte_decrement_refcnt(lte, lookup_table);
}
- *msgsize_ret = msgsize;
- *mailbox_ret = mailbox;
- return 0;
}
static void
-unlink_message_queues(struct wimfs_context *ctx)
+delete_empty_streams(struct wimfs_context *ctx)
{
- mq_unlink(ctx->unmount_to_daemon_mq_name);
- mq_unlink(ctx->daemon_to_unmount_mq_name);
-}
-
-/* Closes the message queues, which are allocated in static variables */
-static void
-close_message_queues(struct wimfs_context *ctx)
-{
- DEBUG("Closing message queues");
- mq_close(ctx->unmount_to_daemon_mq);
- ctx->unmount_to_daemon_mq = (mqd_t)(-1);
- mq_close(ctx->daemon_to_unmount_mq);
- ctx->daemon_to_unmount_mq = (mqd_t)(-1);
- unlink_message_queues(ctx);
-}
-
-
-struct unmount_msg_hdr {
- u32 min_version;
- u32 cur_version;
- u32 msg_type;
- u32 msg_size;
-} _packed_attribute;
-
-struct msg_unmount_request {
- struct unmount_msg_hdr hdr;
- u32 unmount_flags;
- u8 want_progress_messages;
-} _packed_attribute;
-
-struct msg_daemon_info {
- struct unmount_msg_hdr hdr;
- pid_t daemon_pid;
- u32 mount_flags;
-} _packed_attribute;
-
-struct msg_unmount_finished {
- struct unmount_msg_hdr hdr;
- s32 status;
-} _packed_attribute;
-
-struct msg_write_streams_progress {
- struct unmount_msg_hdr hdr;
- union wimlib_progress_info info;
-} _packed_attribute;
-
-enum {
- MSG_TYPE_UNMOUNT_REQUEST,
- MSG_TYPE_DAEMON_INFO,
- MSG_TYPE_WRITE_STREAMS_PROGRESS,
- MSG_TYPE_UNMOUNT_FINISHED,
- MSG_TYPE_MAX,
-};
-
-struct msg_handler_context_hdr {
- int timeout_seconds;
-};
-
-struct unmount_msg_handler_context {
- struct msg_handler_context_hdr hdr;
- pid_t daemon_pid;
- int mount_flags;
- int status;
- wimlib_progress_func_t progfunc;
- void *progctx;
-};
-
-struct daemon_msg_handler_context {
- struct msg_handler_context_hdr hdr;
- struct wimfs_context *wimfs_ctx;
-};
+ struct wim_lookup_table_entry *lte, *tmp;
+ struct wim_image_metadata *imd;
-static int
-send_unmount_request_msg(mqd_t mq, int unmount_flags, u8 want_progress_messages)
-{
- DEBUG("Sending unmount request msg");
- struct msg_unmount_request msg = {
- .hdr = {
- .min_version = ((unmount_flags & WIMLIB_UNMOUNT_FLAG_NEW_IMAGE) ?
- WIMLIB_MAKEVERSION(1, 6, 2) :
- WIMLIB_MAKEVERSION(1, 2, 1)),
- .cur_version = WIMLIB_VERSION_CODE,
- .msg_type = MSG_TYPE_UNMOUNT_REQUEST,
- .msg_size = sizeof(msg),
- },
- .unmount_flags = unmount_flags,
- .want_progress_messages = want_progress_messages,
- };
-
- if (mq_send(mq, (void*)&msg, sizeof(msg), 1)) {
- ERROR_WITH_ERRNO("Failed to communicate with filesystem daemon");
- return WIMLIB_ERR_MQUEUE;
- }
- return 0;
-}
+ imd = wim_get_current_image_metadata(ctx->wim);
-static int
-send_daemon_info_msg(mqd_t mq, pid_t pid, int mount_flags)
-{
- DEBUG("Sending daemon info msg (pid = %d, mount_flags=%x)",
- pid, mount_flags);
-
- struct msg_daemon_info msg = {
- .hdr = {
- .min_version = WIMLIB_MAKEVERSION(1, 2, 1),
- .cur_version = WIMLIB_VERSION_CODE,
- .msg_type = MSG_TYPE_DAEMON_INFO,
- .msg_size = sizeof(msg),
- },
- .daemon_pid = pid,
- .mount_flags = mount_flags,
- };
- if (mq_send(mq, (void*)&msg, sizeof(msg), 1)) {
- ERROR_WITH_ERRNO("Failed to send daemon info to unmount process");
- return WIMLIB_ERR_MQUEUE;
- }
- return 0;
+ image_for_each_unhashed_stream_safe(lte, tmp, imd) {
+ if (!lte->size) {
+ *retrieve_lte_pointer(lte) = NULL;
+ list_del(<e->unhashed_list);
+ free_lookup_table_entry(lte);
+ }
+ }
}
static void
-send_unmount_finished_msg(mqd_t mq, int status)
-{
- DEBUG("Sending unmount finished msg");
- struct msg_unmount_finished msg = {
- .hdr = {
- .min_version = WIMLIB_MAKEVERSION(1, 2, 1),
- .cur_version = WIMLIB_VERSION_CODE,
- .msg_type = MSG_TYPE_UNMOUNT_FINISHED,
- .msg_size = sizeof(msg),
- },
- .status = status,
- };
- if (mq_send(mq, (void*)&msg, sizeof(msg), 1))
- ERROR_WITH_ERRNO("Failed to send status to unmount process");
-}
-
-static enum wimlib_progress_status
-unmount_progress_func(enum wimlib_progress_msg msg,
- union wimlib_progress_info *info, void *_ignored_context)
-{
- if (msg == WIMLIB_PROGRESS_MSG_WRITE_STREAMS) {
- struct msg_write_streams_progress msg = {
- .hdr = {
- .min_version = WIMLIB_MAKEVERSION(1, 2, 1),
- .cur_version = WIMLIB_VERSION_CODE,
- .msg_type = MSG_TYPE_WRITE_STREAMS_PROGRESS,
- .msg_size = sizeof(msg),
- },
- .info = *info,
- };
- if (mq_send(wimfs_get_context()->daemon_to_unmount_mq,
- (void*)&msg, sizeof(msg), 1))
- {
- ERROR_WITH_ERRNO("Failed to send progress information "
- "to unmount process");
+inode_close_fds(struct wim_inode *inode)
+{
+ u16 num_open_fds = inode->i_num_opened_fds;
+ for (u16 i = 0; num_open_fds; i++) {
+ if (inode->i_fds[i]) {
+ close_wimfs_fd(inode->i_fds[i]);
+ num_open_fds--;
}
}
- return WIMLIB_PROGRESS_STATUS_CONTINUE;
}
static void
-release_extra_refcnts(struct wimfs_context *ctx)
+close_all_fds(struct wimfs_context *ctx)
{
- struct list_head *list = &ctx->orig_stream_list;
- struct wim_lookup_table *lookup_table = ctx->wim->lookup_table;
- struct wim_lookup_table_entry *lte, *tmp;
+ struct wim_inode *inode, *tmp;
+ struct wim_image_metadata *imd;
- list_for_each_entry_safe(lte, tmp, list, orig_stream_list) {
- u32 n = lte->out_refcnt;
- while (n--)
- lte_decrement_refcnt(lte, lookup_table);
- }
+ imd = wim_get_current_image_metadata(ctx->wim);
+
+ list_for_each_entry_safe(inode, tmp, &imd->inode_list, i_list)
+ inode_close_fds(inode);
}
/* Moves the currently selected image, which may have been modified, to a new
renew_current_image(struct wimfs_context *ctx)
{
WIMStruct *wim = ctx->wim;
- int ret;
int idx = wim->current_image - 1;
struct wim_image_metadata *imd = wim->image_metadata[idx];
struct wim_image_metadata *replace_imd;
struct wim_lookup_table_entry *new_lte;
-
- if (imd->metadata_lte->resource_location != RESOURCE_IN_WIM) {
- ERROR("Can't reset modified image that doesn't yet "
- "exist in the on-disk WIM file!");
- return WIMLIB_ERR_METADATA_NOT_FOUND;
- }
+ int ret;
/* Create 'replace_imd' structure to use for the reset original,
* unmodified image. */
+ ret = WIMLIB_ERR_NOMEM;
replace_imd = new_image_metadata();
if (!replace_imd)
- return WIMLIB_ERR_NOMEM;
+ goto err;
/* Create new stream reference for the modified image's metadata
* resource, which doesn't exist yet. */
free_lookup_table_entry(new_lte);
err_put_replace_imd:
put_image_metadata(replace_imd, NULL);
+err:
return ret;
}
-static int
-msg_unmount_request_handler(const void *_msg, void *_handler_ctx)
-{
- const struct msg_unmount_request *msg = _msg;
- struct daemon_msg_handler_context *handler_ctx = _handler_ctx;
- struct wimfs_context *wimfs_ctx;
- int status = 0;
- int ret;
- int unmount_flags;
-
- DEBUG("Handling unmount request msg");
-
- wimfs_ctx = handler_ctx->wimfs_ctx;
- if (msg->hdr.msg_size < sizeof(*msg)) {
- status = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- goto out;
- }
-
- unmount_flags = msg->unmount_flags;
-
- wimlib_register_progress_function(wimfs_ctx->wim,
- (msg->want_progress_messages ?
- unmount_progress_func : NULL),
- NULL);
-
- ret = send_daemon_info_msg(wimfs_ctx->daemon_to_unmount_mq, getpid(),
- wimfs_ctx->mount_flags);
- if (ret != 0) {
- status = ret;
- goto out;
- }
-
- if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) {
-
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_NEW_IMAGE) {
- ret = renew_current_image(wimfs_ctx);
- if (ret) {
- status = ret;
- goto out;
- }
- } else {
- release_extra_refcnts(wimfs_ctx);
- }
- INIT_LIST_HEAD(&wimfs_ctx->orig_stream_list);
-
- int 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;
- status = rebuild_wim(wimfs_ctx, write_flags);
- }
- } else {
- DEBUG("Read-only mount");
- status = 0;
- }
-
-out:
- if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- ret = delete_staging_dir(wimfs_ctx);
- if (ret != 0) {
- ERROR("Failed to delete the staging directory");
- if (status == 0)
- status = ret;
- }
- }
- wimfs_ctx->status = status;
- wimfs_ctx->have_status = true;
- return MSG_BREAK_LOOP;
-}
-
-static int
-msg_daemon_info_handler(const void *_msg, void *_handler_ctx)
-{
- const struct msg_daemon_info *msg = _msg;
- struct unmount_msg_handler_context *handler_ctx = _handler_ctx;
-
- DEBUG("Handling daemon info msg");
- if (msg->hdr.msg_size < sizeof(*msg))
- return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- handler_ctx->daemon_pid = msg->daemon_pid;
- handler_ctx->mount_flags = msg->mount_flags;
- handler_ctx->hdr.timeout_seconds = 1;
- DEBUG("pid of daemon is %d; mount flags were %#x",
- handler_ctx->daemon_pid,
- handler_ctx->mount_flags);
- return 0;
-}
-
-static int
-msg_write_streams_progress_handler(const void *_msg, void *_handler_ctx)
-{
- const struct msg_write_streams_progress *msg = _msg;
- struct unmount_msg_handler_context *handler_ctx = _handler_ctx;
-
- if (msg->hdr.msg_size < sizeof(*msg))
- return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- return call_progress(handler_ctx->progfunc,
- WIMLIB_PROGRESS_MSG_WRITE_STREAMS,
- (union wimlib_progress_info *)&msg->info,
- handler_ctx->progctx);
-}
-
-static int
-msg_unmount_finished_handler(const void *_msg, void *_handler_ctx)
-{
- const struct msg_unmount_finished *msg = _msg;
- struct unmount_msg_handler_context *handler_ctx = _handler_ctx;
-
- DEBUG("Handling unmount finished message");
- if (msg->hdr.msg_size < sizeof(*msg))
- return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- handler_ctx->status = msg->status;
- DEBUG("status is %d", handler_ctx->status);
- return MSG_BREAK_LOOP;
-}
-
-static int
-unmount_timed_out_cb(void *_handler_ctx)
+static enum wimlib_progress_status
+commit_progress_func(enum wimlib_progress_msg msg,
+ union wimlib_progress_info *info, void *progctx)
{
- const struct unmount_msg_handler_context *handler_ctx = _handler_ctx;
+ mqd_t mq = *(mqd_t *)progctx;
+ struct commit_progress_report report;
- if (handler_ctx->daemon_pid == 0 ||
- (kill(handler_ctx->daemon_pid, 0) != 0 && errno == ESRCH))
- {
- ERROR("The filesystem daemon has crashed! Changes to the "
- "WIM may not have been commited.");
- return WIMLIB_ERR_FILESYSTEM_DAEMON_CRASHED;
- }
-
- DEBUG("Filesystem daemon is still alive... "
- "Waiting another %d seconds", handler_ctx->hdr.timeout_seconds);
- return 0;
+ memset(&report, 0, sizeof(report));
+ report.msg = msg;
+ if (info)
+ report.info = *info;
+ mq_send(mq, (const char *)&report, sizeof(report), 1);
+ return WIMLIB_PROGRESS_STATUS_CONTINUE;
}
+/* Commit the mounted image to the underlying WIM file. */
static int
-daemon_timed_out_cb(void *_handler_ctx)
+commit_image(struct wimfs_context *ctx, int unmount_flags, mqd_t mq)
{
- ERROR("Timed out waiting for unmount request! "
- "Changes to the mounted WIM will not be committed.");
- return WIMLIB_ERR_TIMEOUT;
-}
-
-typedef int (*msg_handler_t)(const void *_msg, void *_handler_ctx);
-
-struct msg_handler_callbacks {
- int (*timed_out)(void * _handler_ctx);
- msg_handler_t msg_handlers[MSG_TYPE_MAX];
-};
-
-static const struct msg_handler_callbacks unmount_msg_handler_callbacks = {
- .timed_out = unmount_timed_out_cb,
- .msg_handlers = {
- [MSG_TYPE_DAEMON_INFO] = msg_daemon_info_handler,
- [MSG_TYPE_WRITE_STREAMS_PROGRESS] = msg_write_streams_progress_handler,
- [MSG_TYPE_UNMOUNT_FINISHED] = msg_unmount_finished_handler,
- },
-};
-
-static const struct msg_handler_callbacks daemon_msg_handler_callbacks = {
- .timed_out = daemon_timed_out_cb,
- .msg_handlers = {
- [MSG_TYPE_UNMOUNT_REQUEST] = msg_unmount_request_handler,
- },
-};
-
-static int
-receive_message(mqd_t mq,
- struct msg_handler_context_hdr *handler_ctx,
- const msg_handler_t msg_handlers[],
- long mailbox_size, void *mailbox)
-{
- struct timeval now;
- struct timespec timeout;
- ssize_t bytes_received;
- struct unmount_msg_hdr *hdr;
- int ret;
+ int write_flags;
- gettimeofday(&now, NULL);
- timeout.tv_sec = now.tv_sec + handler_ctx->timeout_seconds;
- timeout.tv_nsec = now.tv_usec * 1000;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_SEND_PROGRESS)
+ wimlib_register_progress_function(ctx->wim,
+ commit_progress_func, &mq);
+ else
+ wimlib_register_progress_function(ctx->wim, NULL, NULL);
- bytes_received = mq_timedreceive(mq, mailbox,
- mailbox_size, NULL, &timeout);
- hdr = mailbox;
- if (bytes_received == -1) {
- if (errno == ETIMEDOUT) {
- ret = WIMLIB_ERR_TIMEOUT;
- } else {
- ERROR_WITH_ERRNO("mq_timedreceive()");
- ret = WIMLIB_ERR_MQUEUE;
- }
- } else if (bytes_received < sizeof(*hdr) ||
- bytes_received != hdr->msg_size) {
- ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- } else if (WIMLIB_VERSION_CODE < hdr->min_version) {
- /*ERROR("Cannot understand the received message. "*/
- /*"Please upgrade wimlib to at least v%d.%d.%d",*/
- /*WIMLIB_GET_MAJOR_VERSION(hdr->min_version),*/
- /*WIMLIB_GET_MINOR_VERSION(hdr->min_version),*/
- /*WIMLIB_GET_PATCH_VERSION(hdr->min_version));*/
- ret = MSG_VERSION_TOO_HIGH;
- } else if (hdr->msg_type >= MSG_TYPE_MAX) {
- ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- } else if (msg_handlers[hdr->msg_type] == NULL) {
- ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_NEW_IMAGE) {
+ int ret = renew_current_image(ctx);
+ if (ret)
+ return ret;
} else {
- ret = msg_handlers[hdr->msg_type](mailbox, handler_ctx);
+ release_extra_refcnts(ctx);
}
- return ret;
-}
-
-static int
-message_loop(mqd_t mq,
- const struct msg_handler_callbacks *callbacks,
- struct msg_handler_context_hdr *handler_ctx)
-{
- static const size_t MAX_MSG_SIZE = 512;
- long msgsize;
- void *mailbox;
- int ret;
-
- DEBUG("Entering message loop");
+ INIT_LIST_HEAD(&ctx->orig_stream_list);
+ delete_empty_streams(ctx);
+ xml_update_image_info(ctx->wim, ctx->wim->current_image);
- ret = get_mailbox(mq, MAX_MSG_SIZE, &msgsize, &mailbox);
- if (ret != 0)
- return ret;
- while (1) {
- ret = receive_message(mq, handler_ctx,
- callbacks->msg_handlers,
- msgsize, mailbox);
- if (ret == 0 || ret == MSG_VERSION_TOO_HIGH) {
- continue;
- } else if (ret == MSG_BREAK_LOOP) {
- ret = 0;
- break;
- } else if (ret == WIMLIB_ERR_TIMEOUT) {
- if (callbacks->timed_out)
- ret = callbacks->timed_out(handler_ctx);
- if (ret == 0)
- continue;
- else
- break;
- } else {
- ERROR_WITH_ERRNO("Error communicating with "
- "filesystem daemon");
- break;
- }
- }
- FREE(mailbox);
- DEBUG("Exiting message loop");
- return ret;
+ 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);
}
-/* Execute `fusermount -u', which is installed setuid root, to unmount the WIM.
- *
- * FUSE does not yet implement synchronous unmounts. This means that fusermount
- * -u will return before the filesystem daemon returns from wimfs_destroy().
- * This is partly what we want, because we need to send a message from this
- * process to the filesystem daemon telling whether --commit was specified or
- * not. However, after that, the unmount process must wait for the filesystem
- * daemon to finish writing the WIM file.
- */
static int
-execute_fusermount(const char *dir, bool lazy)
+unmount_wimfs(const struct wimfs_unmount_info *info)
{
- pid_t pid;
- int ret;
+ struct fuse_context *fuse_ctx = fuse_get_context();
+ struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
+ int unmount_flags = info->unmount_flags;
+ mqd_t mq = (mqd_t)-1;
int status;
- pid = fork();
- if (pid == -1) {
- ERROR_WITH_ERRNO("Failed to fork()");
- return WIMLIB_ERR_FORK;
- }
- if (pid == 0) {
- /* Child */
- char *argv[10];
- char **argp = argv;
- *argp++ = "fusermount";
- if (lazy)
- *argp++ = "-z";
- *argp++ = "-u";
- *argp++ = (char*)dir;
- *argp = NULL;
- execvp("fusermount", argv);
- ERROR_WITH_ERRNO("Failed to execute `fusermount'");
- exit(WIMLIB_ERR_FUSERMOUNT);
- }
-
- /* Parent */
- ret = waitpid(pid, &status, 0);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to wait for fusermount process to "
- "terminate");
- return WIMLIB_ERR_FUSERMOUNT;
- }
+ if (fuse_ctx->uid != wimfs_ctx->owner_uid &&
+ fuse_ctx->uid != 0)
+ return -EPERM;
- if (!WIFEXITED(status)) {
- ERROR("'fusermount' did not terminate normally!");
- return WIMLIB_ERR_FUSERMOUNT;
+ if (info->mq_name[0]) {
+ mq = mq_open(info->mq_name, O_WRONLY | O_NONBLOCK);
+ if (mq == (mqd_t)-1)
+ return -errno;
}
- status = WEXITSTATUS(status);
-
- if (status == 0)
- return 0;
-
- if (status != WIMLIB_ERR_FUSERMOUNT)
- return WIMLIB_ERR_FUSERMOUNT;
-
- /* Try again, but with the `umount' program. This is required on other
- * FUSE implementations such as FreeBSD's that do not have a
- * `fusermount' program. */
- ERROR("Falling back to 'umount'. Note: you may need to be "
- "root for this to work");
- pid = fork();
- if (pid == -1) {
- ERROR_WITH_ERRNO("Failed to fork()");
- return WIMLIB_ERR_FORK;
- }
- if (pid == 0) {
- /* Child */
- char *argv[10];
- char **argp = argv;
- *argp++ = "umount";
- if (lazy)
- *argp++ = "-l";
- *argp++ = (char*)dir;
- *argp = NULL;
- execvp("umount", argv);
- ERROR_WITH_ERRNO("Failed to execute `umount'");
- exit(WIMLIB_ERR_FUSERMOUNT);
- }
+ /* Ignore COMMIT if the image is mounted read-only. */
+ if (!(wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE))
+ unmount_flags &= ~WIMLIB_UNMOUNT_FLAG_COMMIT;
- /* Parent */
- ret = waitpid(pid, &status, 0);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to wait for `umount' process to "
- "terminate");
- return WIMLIB_ERR_FUSERMOUNT;
+ if (wimfs_ctx->num_open_fds) {
+ 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;
+ }
+ close_all_fds(wimfs_ctx);
}
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- ERROR("`umount' did not successfully complete");
- return WIMLIB_ERR_FUSERMOUNT;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT)
+ status = 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);
}
-
return 0;
}
static int
wimfs_chmod(const char *path, mode_t mask)
{
- struct wim_dentry *dentry;
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_inode *inode;
- struct wimfs_context *ctx = wimfs_get_context();
struct wimlib_unix_data unix_data;
- int ret;
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
- return -EPERM;
-
- ret = wim_pathname_to_stream(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK,
- &dentry, NULL, NULL);
- if (ret)
- return ret;
+ return -EOPNOTSUPP;
- inode = dentry->d_inode;
+ inode = wim_pathname_to_inode(ctx->wim, path);
+ if (!inode)
+ return -errno;
- unix_data.uid = ctx->default_uid;
- unix_data.gid = ctx->default_gid;
+ unix_data.uid = ctx->owner_uid;
+ unix_data.gid = ctx->owner_gid;
unix_data.mode = mask;
unix_data.rdev = 0;
+
if (!inode_set_unix_data(inode, &unix_data, UNIX_DATA_MODE))
return -ENOMEM;
static int
wimfs_chown(const char *path, uid_t uid, gid_t gid)
{
- struct wim_dentry *dentry;
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_inode *inode;
- struct wimfs_context *ctx = wimfs_get_context();
- int which;
struct wimlib_unix_data unix_data;
- int ret;
+ int which;
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
- return -EPERM;
-
- ret = wim_pathname_to_stream(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK,
- &dentry, NULL, NULL);
- if (ret)
- return ret;
+ return -EOPNOTSUPP;
- inode = dentry->d_inode;
+ inode = wim_pathname_to_inode(ctx->wim, path);
+ if (!inode)
+ return -errno;
which = 0;
if (uid != (uid_t)-1)
which |= UNIX_DATA_UID;
else
- uid = ctx->default_uid;
+ uid = ctx->owner_uid;
if (gid != (gid_t)-1)
which |= UNIX_DATA_GID;
else
- gid = ctx->default_gid;
-
+ gid = ctx->owner_gid;
unix_data.uid = uid;
unix_data.gid = gid;
unix_data.mode = inode_default_unix_mode(inode);
unix_data.rdev = 0;
+
if (!inode_set_unix_data(inode, &unix_data, which))
return -ENOMEM;
return 0;
}
-/* Called when the filesystem is unmounted. */
-static void
-wimfs_destroy(void *p)
-{
- struct wimfs_context *wimfs_ctx = wimfs_get_context();
- if (open_message_queues(wimfs_ctx, true) == 0) {
- struct daemon_msg_handler_context handler_ctx = {
- .hdr = {
- .timeout_seconds = 5,
- },
- .wimfs_ctx = wimfs_ctx,
- };
- message_loop(wimfs_ctx->unmount_to_daemon_mq,
- &daemon_msg_handler_callbacks,
- &handler_ctx.hdr);
- }
-}
-
static int
-wimfs_fgetattr(const char *path, struct stat *stbuf,
- struct fuse_file_info *fi)
+wimfs_fgetattr(const char *path, struct stat *stbuf, struct fuse_file_info *fi)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
+ struct wimfs_fd *fd = WIMFS_FD(fi);
return inode_to_stbuf(fd->f_inode, fd->f_lte, stbuf);
}
static int
wimfs_ftruncate(const char *path, off_t size, struct fuse_file_info *fi)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
- int ret = ftruncate(fd->staging_fd.fd, size);
- if (ret)
+ struct wimfs_fd *fd = WIMFS_FD(fi);
+ if (ftruncate(fd->f_staging_fd.fd, size))
return -errno;
touch_inode(fd->f_inode);
fd->f_lte->size = size;
return 0;
}
-/*
- * Fills in a `struct stat' that corresponds to a file or directory in the WIM.
- */
static int
wimfs_getattr(const char *path, struct stat *stbuf)
{
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
struct wim_lookup_table_entry *lte;
int ret;
- struct wimfs_context *ctx = wimfs_get_context();
ret = wim_pathname_to_stream(ctx->wim, path,
get_lookup_flags(ctx) |
LOOKUP_FLAG_DIRECTORY_OK,
&dentry, <e, NULL);
- if (ret != 0)
+ if (ret)
return ret;
return inode_to_stbuf(dentry->d_inode, lte, stbuf);
}
-#ifdef ENABLE_XATTR
-/* Read an alternate data stream through the XATTR interface, or get its size */
+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);
+ return srcsize;
+}
+
static int
wimfs_getxattr(const char *path, const char *name, char *value,
size_t size)
{
- int ret;
+ struct fuse_context *fuse_ctx = fuse_get_context();
+ const struct wimfs_context *ctx = WIMFS_CTX(fuse_ctx);
struct wim_inode *inode;
struct wim_ads_entry *ads_entry;
- u64 stream_size;
struct wim_lookup_table_entry *lte;
- struct wimfs_context *ctx = wimfs_get_context();
+
+ 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. */
+ name += 6;
+ if (!strcmp(name, "wim_filename")) {
+ return copy_xattr(value, size, ctx->wim->filename,
+ strlen(ctx->wim->filename));
+ }
+ if (!strcmp(name, "wim_info")) {
+ struct wimlib_wim_info info;
+
+ wimlib_get_wim_info(ctx->wim, &info);
+
+ return copy_xattr(value, size, &info, sizeof(info));
+ }
+ if (!strcmp(name, "mounted_image")) {
+ return copy_xattr(value, size,
+ &ctx->wim->current_image, sizeof(int));
+ }
+ if (!strcmp(name, "mount_flags")) {
+ return copy_xattr(value, size,
+ &ctx->mount_flags, sizeof(int));
+ }
+ if (!strcmp(name, "unmount")) {
+ struct wimfs_unmount_info info;
+ memset(&info, 0, sizeof(info));
+ return unmount_wimfs(&info);
+ }
+ return -ENOATTR;
+ }
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
return -ENOTSUP;
- if (strlen(name) <= 5 || memcmp(name, "user.", 5) != 0)
+ if (strncmp(name, "user.", 5))
return -ENOATTR;
name += 5;
+ /* Querying a named data stream */
+
inode = wim_pathname_to_inode(ctx->wim, path);
if (!inode)
return -errno;
- ads_entry = inode_get_ads_entry(inode, name, NULL);
+ ads_entry = inode_get_ads_entry(inode, name);
if (!ads_entry)
- return -ENOATTR;
+ return (errno == ENOENT) ? -ENOATTR : -errno;
lte = ads_entry->lte;
- stream_size = lte->size;
+ if (!lte)
+ return 0;
- if (size == 0)
- return stream_size;
+ if (unlikely(lte->size > INT_MAX))
+ return -EFBIG;
- if (stream_size > size)
- return -ERANGE;
+ if (size) {
+ if (lte->size > size)
+ return -ERANGE;
- ret = read_full_stream_into_buf(lte, value);
- if (ret) {
- if (errno)
+ if (read_full_stream_into_buf(lte, value))
return -errno;
- else
- return -EIO;
}
- return stream_size;
+ return lte->size;
}
-#endif
-/* Create a hard link */
static int
-wimfs_link(const char *to, const char *from)
+wimfs_link(const char *existing_path, const char *new_path)
{
- struct wim_dentry *from_dentry, *from_dentry_parent;
- const char *link_name;
- struct wim_inode *inode;
WIMStruct *wim = wimfs_get_WIMStruct();
- int ret;
+ const char *new_name;
+ struct wim_inode *inode;
+ struct wim_dentry *dir;
+ struct wim_dentry *new_alias;
- inode = wim_pathname_to_inode(wim, to);
+ inode = wim_pathname_to_inode(wim, existing_path);
if (!inode)
return -errno;
FILE_ATTRIBUTE_REPARSE_POINT))
return -EPERM;
- from_dentry_parent = get_parent_dentry(wim, from, WIMLIB_CASE_SENSITIVE);
- if (!from_dentry_parent)
+ new_name = path_basename(new_path);
+
+ dir = get_parent_dentry(wim, new_path, WIMLIB_CASE_SENSITIVE);
+ if (!dir)
return -errno;
- if (!dentry_is_directory(from_dentry_parent))
+
+ if (!dentry_is_directory(dir))
return -ENOTDIR;
- link_name = path_basename(from);
- if (get_dentry_child_with_name(from_dentry_parent, link_name,
- WIMLIB_CASE_SENSITIVE))
+ if (get_dentry_child_with_name(dir, new_name, WIMLIB_CASE_SENSITIVE))
return -EEXIST;
- ret = new_dentry(link_name, &from_dentry);
- if (ret)
+ 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);
- from_dentry->d_inode = inode;
- inode_add_dentry(from_dentry, inode);
- dentry_add_child(from_dentry_parent, from_dentry);
return 0;
}
-#ifdef ENABLE_XATTR
static int
wimfs_listxattr(const char *path, char *list, size_t size)
{
- size_t needed_size;
- struct wim_inode *inode;
- struct wimfs_context *ctx = wimfs_get_context();
- u16 i;
- char *p;
- bool size_only = (size == 0);
+ const struct wimfs_context *ctx = wimfs_get_context();
+ const struct wim_inode *inode;
+ char *p = list;
+ char *end = list + size;
+ int total_size = 0;
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
return -ENOTSUP;
- /* List alternate data streams, or get the list size */
+ /* List named data streams, or get the list size. We report each named
+ * data stream "X" as an extended attribute "user.X". */
inode = wim_pathname_to_inode(ctx->wim, path);
if (!inode)
return -errno;
- p = list;
- for (i = 0; i < inode->i_num_ads; i++) {
-
- if (!ads_entry_is_named_stream(&inode->i_ads_entries[i]))
- continue;
-
+ for (u16 i = 0; i < inode->i_num_ads; i++) {
+ const struct wim_ads_entry *entry;
char *stream_name_mbs;
size_t stream_name_mbs_nbytes;
- int ret;
- ret = utf16le_to_tstr(inode->i_ads_entries[i].stream_name,
- inode->i_ads_entries[i].stream_name_nbytes,
- &stream_name_mbs,
- &stream_name_mbs_nbytes);
- if (ret)
+ entry = &inode->i_ads_entries[i];
+
+ if (!entry->stream_name_nbytes)
+ continue;
+
+ if (utf16le_to_tstr(entry->stream_name,
+ entry->stream_name_nbytes,
+ &stream_name_mbs,
+ &stream_name_mbs_nbytes))
return -errno;
- needed_size = stream_name_mbs_nbytes + 6;
- if (!size_only) {
- if (needed_size > size) {
+ if (unlikely(INT_MAX - total_size < stream_name_mbs_nbytes + 6)) {
+ FREE(stream_name_mbs);
+ return -EFBIG;
+ }
+
+ total_size += stream_name_mbs_nbytes + 6;
+ if (size) {
+ if (end - p < stream_name_mbs_nbytes + 6) {
FREE(stream_name_mbs);
return -ERANGE;
}
- sprintf(p, "user.%s", stream_name_mbs);
- size -= needed_size;
+ p = mempcpy(p, "user.", 5);
+ p = mempcpy(p, stream_name_mbs, stream_name_mbs_nbytes);
+ *p++ = '\0';
}
- p += needed_size;
FREE(stream_name_mbs);
}
- return p - list;
+ return total_size;
}
-#endif
-
-/* Create a directory in the WIM image. */
static int
wimfs_mkdir(const char *path, mode_t mode)
{
+ /* 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);
}
-/* Create a non-directory, non-symbolic-link file or alternate data stream in
- * the WIM image. */
static int
wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
{
- const char *stream_name;
struct fuse_context *fuse_ctx = fuse_get_context();
struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx);
+ const char *stream_name;
if ((wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
- && (stream_name = path_stream_name(path))) {
+ && (stream_name = path_stream_name(path)))
+ {
+ struct wim_ads_entry *old_entry;
+ struct wim_ads_entry *new_entry;
+ struct wim_inode *inode;
+ char *p;
+
+ /* Create a named data stream. */
if (!S_ISREG(mode))
- return -EPERM;
+ return -EOPNOTSUPP;
- /* Make an alternate data stream */
- struct wim_ads_entry *new_entry;
- struct wim_inode *inode;
+ p = (char *)stream_name - 1;
- char *p = (char*)stream_name - 1;
- wimlib_assert(*p == ':');
*p = '\0';
-
inode = wim_pathname_to_inode(wimfs_ctx->wim, path);
+ *p = ':';
if (!inode)
return -errno;
- if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)
- return -ENOENT;
- if (inode_get_ads_entry(inode, stream_name, NULL))
+
+ old_entry = inode_get_ads_entry(inode, stream_name);
+ if (old_entry)
return -EEXIST;
+ if (errno != ENOENT)
+ return -errno;
+
new_entry = inode_add_ads(inode, stream_name);
if (!new_entry)
- return -ENOMEM;
+ return -errno;
return 0;
} else {
+ /* Create a regular file, device node, named pipe, or socket.
+ */
+
if (!S_ISREG(mode) &&
!(wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA))
return -EPERM;
- /* Make a regular file, device node, named pipe, or socket. */
+ /* 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);
}
}
-/* Open a file. */
static int
wimfs_open(const char *path, struct fuse_file_info *fi)
{
+ struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
- struct wim_lookup_table_entry *lte;
- int ret;
- struct wimfs_fd *fd;
struct wim_inode *inode;
+ struct wim_lookup_table_entry *lte;
u16 stream_idx;
- u32 stream_id;
- struct wimfs_context *ctx = wimfs_get_context();
- struct wim_lookup_table_entry **back_ptr;
+ struct wimfs_fd *fd;
+ int ret;
ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
&dentry, <e, &stream_idx);
inode = dentry->d_inode;
- if (stream_idx == 0) {
- stream_id = 0;
- back_ptr = &inode->i_lte;
- } else {
- stream_id = inode->i_ads_entries[stream_idx - 1].stream_id;
- back_ptr = &inode->i_ads_entries[stream_idx - 1].lte;
- }
-
/* 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. */
+ * staging directory if we are opening it writable. */
if (flags_writable(fi->flags) &&
(!lte || lte->resource_location != RESOURCE_IN_STAGING_FILE)) {
- u64 size = (lte) ? lte->size : 0;
- ret = extract_resource_to_staging_dir(inode, stream_id,
- <e, size, ctx);
+ ret = extract_resource_to_staging_dir(inode,
+ stream_idx,
+ <e,
+ lte ? lte->size : 0,
+ ctx);
if (ret)
return ret;
- *back_ptr = lte;
}
- ret = alloc_wimfs_fd(inode, stream_id, lte, &fd);
+ ret = alloc_wimfs_fd(inode, inode_stream_idx_to_id(inode, stream_idx),
+ lte, &fd);
if (ret)
return ret;
if (lte && lte->resource_location == RESOURCE_IN_STAGING_FILE) {
int raw_fd;
- raw_fd = open(lte->staging_file_name, fi->flags);
+ raw_fd = openat(lte->staging_dir_fd, lte->staging_file_name,
+ (fi->flags & O_ACCMODE) | O_NOFOLLOW);
if (raw_fd < 0) {
- int errno_save = errno;
close_wimfs_fd(fd);
- return -errno_save;
+ return -errno;
}
- filedes_init(&fd->staging_fd, raw_fd);
+ filedes_init(&fd->f_staging_fd, raw_fd);
}
fi->fh = (uintptr_t)fd;
return 0;
}
-/* Opens a directory. */
static int
wimfs_opendir(const char *path, struct fuse_file_info *fi)
{
+ WIMStruct *wim = wimfs_get_WIMStruct();
struct wim_inode *inode;
+ struct wimfs_fd *fd;
int ret;
- struct wimfs_fd *fd = NULL;
- struct wimfs_context *ctx = wimfs_get_context();
- WIMStruct *wim = ctx->wim;
inode = wim_pathname_to_inode(wim, path);
if (!inode)
if (!inode_is_directory(inode))
return -ENOTDIR;
ret = alloc_wimfs_fd(inode, 0, NULL, &fd);
+ if (ret)
+ return ret;
fi->fh = (uintptr_t)fd;
- return ret;
+ 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)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
+ struct wimfs_fd *fd = WIMFS_FD(fi);
+ const struct wim_lookup_table_entry *lte;
ssize_t ret;
- u64 stream_size;
- if (!fd)
- return -EBADF;
-
- if (size == 0)
+ lte = fd->f_lte;
+ if (!lte)
return 0;
- if (fd->f_lte)
- stream_size = fd->f_lte->size;
- else
- stream_size = 0;
+ if (offset >= lte->size)
+ return 0;
- if (offset > stream_size)
- return -EOVERFLOW;
+ if (size > lte->size - offset)
+ size = lte->size - offset;
- size = min(size, stream_size - offset);
- if (size == 0)
+ if (!size)
return 0;
- switch (fd->f_lte->resource_location) {
- case RESOURCE_IN_STAGING_FILE:
- ret = raw_pread(&fd->staging_fd, buf, size, offset);
- if (ret == -1)
- ret = -errno;
- break;
+ switch (lte->resource_location) {
case RESOURCE_IN_WIM:
- if (read_partial_wim_stream_into_buf(fd->f_lte, size,
- offset, buf))
- ret = errno ? -errno : -EIO;
+ if (read_partial_wim_stream_into_buf(lte, size, offset, buf))
+ ret = -errno;
else
ret = size;
break;
+ case RESOURCE_IN_STAGING_FILE:
+ ret = raw_pread(&fd->f_staging_fd, buf, size, offset);
+ if (ret < 0)
+ ret = -errno;
+ break;
case RESOURCE_IN_ATTACHED_BUFFER:
- memcpy(buf, fd->f_lte->attached_buffer + offset, size);
+ memcpy(buf, lte->attached_buffer + offset, size);
ret = size;
break;
default:
- ERROR("Invalid resource location");
- ret = -EIO;
+ ret = -EINVAL;
break;
}
return ret;
}
-/* Fills in the entries of the directory specified by @path using the
- * FUSE-provided function @filler. */
static int
wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
- struct wim_inode *inode;
- struct wim_dentry *child;
+ struct wimfs_fd *fd = WIMFS_FD(fi);
+ const struct wim_inode *inode;
+ const struct wim_dentry *child;
int ret;
- if (!fd)
- return -EBADF;
-
inode = fd->f_inode;
ret = filler(buf, ".", NULL, 0);
return 0;
}
-
static int
wimfs_readlink(const char *path, char *buf, size_t buf_len)
{
- struct wimfs_context *ctx = wimfs_get_context();
- struct wim_inode *inode = wim_pathname_to_inode(ctx->wim, path);
- int ret;
+ WIMStruct *wim = wimfs_get_WIMStruct();
+ const struct wim_inode *inode;
+ ssize_t ret;
+
+ inode = wim_pathname_to_inode(wim, path);
if (!inode)
return -errno;
if (!inode_is_symlink(inode))
return -EINVAL;
ret = wim_inode_readlink(inode, buf, buf_len - 1, NULL);
if (ret >= 0) {
- wimlib_assert(ret <= buf_len - 1);
buf[ret] = '\0';
ret = 0;
} else if (ret == -ENAMETOOLONG) {
return ret;
}
-/* Close a file. */
+/* We use this for both release() and releasedir(), since in both cases we
+ * simply need to close the file descriptor. */
static int
wimfs_release(const char *path, struct fuse_file_info *fi)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
- return close_wimfs_fd(fd);
-}
-
-/* Close a directory */
-static int
-wimfs_releasedir(const char *path, struct fuse_file_info *fi)
-{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
- return close_wimfs_fd(fd);
+ return close_wimfs_fd(WIMFS_FD(fi));
}
-#ifdef ENABLE_XATTR
-/* Remove an alternate data stream through the XATTR interface */
static int
wimfs_removexattr(const char *path, const char *name)
{
+ struct wimfs_context *ctx = wimfs_get_context();
struct wim_inode *inode;
struct wim_ads_entry *ads_entry;
- u16 ads_idx;
- struct wimfs_context *ctx = wimfs_get_context();
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
return -ENOTSUP;
- if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0)
+ if (strncmp(name, "user.", 5))
return -ENOATTR;
name += 5;
+ /* Removing a named data stream. */
+
inode = wim_pathname_to_inode(ctx->wim, path);
if (!inode)
return -errno;
- ads_entry = inode_get_ads_entry(inode, name, &ads_idx);
+ ads_entry = inode_get_ads_entry(inode, name);
if (!ads_entry)
- return -ENOATTR;
- inode_remove_ads(inode, ads_idx, ctx->wim->lookup_table);
+ return (errno == ENOENT) ? -ENOATTR : -errno;
+
+ inode_remove_ads(inode, ads_entry, ctx->wim->lookup_table);
return 0;
}
-#endif
-/* Renames a file or directory. See rename (3) */
static int
wimfs_rename(const char *from, const char *to)
{
WIMLIB_CASE_SENSITIVE, NULL);
}
-/* Remove a directory */
static int
wimfs_rmdir(const char *path)
{
- struct wim_dentry *dentry;
WIMStruct *wim = wimfs_get_WIMStruct();
+ struct wim_dentry *dentry;
dentry = get_dentry(wim, path, WIMLIB_CASE_SENSITIVE);
if (!dentry)
return 0;
}
-#ifdef ENABLE_XATTR
-/* Write an alternate data stream through the XATTR interface */
static int
wimfs_setxattr(const char *path, const char *name,
const char *value, size_t size, int flags)
{
- struct wim_ads_entry *existing_ads_entry;
- struct wim_inode *inode;
- u16 ads_idx;
struct wimfs_context *ctx = wimfs_get_context();
- int ret;
+ struct wim_inode *inode;
+ struct wim_ads_entry *existing_entry;
+
+ 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. */
+ name += 6;
+ if (!strcmp(name, "unmount")) {
+ if (size < sizeof(struct wimfs_unmount_info))
+ return -EINVAL;
+ return unmount_wimfs((const void *)value);
+ }
+ return -ENOATTR;
+ }
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
return -ENOTSUP;
- if (strlen(name) <= 5 || memcmp(name, "user.", 5) != 0)
+ if (strncmp(name, "user.", 5))
return -ENOATTR;
name += 5;
+ /* Setting the contents of a named data stream. */
+
inode = wim_pathname_to_inode(ctx->wim, path);
if (!inode)
return -errno;
- existing_ads_entry = inode_get_ads_entry(inode, name, &ads_idx);
- if (existing_ads_entry) {
+ existing_entry = inode_get_ads_entry(inode, name);
+ if (existing_entry) {
if (flags & XATTR_CREATE)
return -EEXIST;
} else {
+ if (errno != ENOENT)
+ return -errno;
if (flags & XATTR_REPLACE)
return -ENOATTR;
}
- ret = inode_add_ads_with_data(inode, name, value,
- size, ctx->wim->lookup_table);
- if (ret == 0) {
- if (existing_ads_entry)
- inode_remove_ads(inode, ads_idx, ctx->wim->lookup_table);
- } else {
- ret = -ENOMEM;
- }
- return ret;
+ if (!inode_add_ads_with_data(inode, name, value,
+ size, ctx->wim->lookup_table))
+ return -errno;
+ if (existing_entry)
+ inode_remove_ads(inode, existing_entry, ctx->wim->lookup_table);
+ return 0;
}
-#endif
static int
wimfs_symlink(const char *to, const char *from)
ret = create_dentry(fuse_ctx, from, S_IFLNK | 0777, 0,
FILE_ATTRIBUTE_REPARSE_POINT, &dentry);
- if (ret == 0) {
- dentry->d_inode->i_reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
- ret = wim_inode_set_symlink(dentry->d_inode, to,
- wimfs_ctx->wim->lookup_table);
- if (ret) {
- remove_dentry(dentry, wimfs_ctx->wim->lookup_table);
- if (ret == WIMLIB_ERR_NOMEM)
- ret = -ENOMEM;
- else
- ret = -EIO;
- }
+ if (ret)
+ return ret;
+ dentry->d_inode->i_reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
+ ret = wim_inode_set_symlink(dentry->d_inode, to,
+ wimfs_ctx->wim->lookup_table);
+ if (ret) {
+ remove_dentry(dentry, wimfs_ctx->wim->lookup_table);
+ if (ret == WIMLIB_ERR_NOMEM)
+ ret = -ENOMEM;
+ else
+ ret = -EINVAL;
}
return ret;
}
-
-/* Reduce the size of a file */
static int
wimfs_truncate(const char *path, off_t size)
{
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
struct wim_lookup_table_entry *lte;
- int ret;
u16 stream_idx;
- u32 stream_id;
- struct wim_inode *inode;
- struct wimfs_context *ctx = wimfs_get_context();
+ int ret;
+ int fd;
ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
&dentry, <e, &stream_idx);
- if (ret != 0)
+ if (ret)
return ret;
- if (lte == NULL && size == 0)
+ if (!lte && !size)
return 0;
- if (lte != NULL && lte->resource_location == RESOURCE_IN_STAGING_FILE) {
- ret = truncate(lte->staging_file_name, size);
- if (ret)
- ret = -errno;
- else
- lte->size = size;
- } else {
- /* File in WIM. Extract it to the staging directory, but only
- * the first @size bytes of it. */
- struct wim_lookup_table_entry **back_ptr;
-
- inode = dentry->d_inode;
- if (stream_idx == 0) {
- stream_id = 0;
- back_ptr = &inode->i_lte;
- } else {
- stream_id = inode->i_ads_entries[stream_idx - 1].stream_id;
- back_ptr = &inode->i_ads_entries[stream_idx - 1].lte;
- }
- ret = extract_resource_to_staging_dir(inode, stream_id,
- <e, size, ctx);
- *back_ptr = lte;
+ if (!lte || lte->resource_location != RESOURCE_IN_STAGING_FILE) {
+ return extract_resource_to_staging_dir(dentry->d_inode,
+ stream_idx, <e,
+ size, ctx);
}
- return ret;
+
+ /* Truncate the staging file. */
+ fd = openat(lte->staging_dir_fd, lte->staging_file_name,
+ O_WRONLY | O_NOFOLLOW);
+ if (fd < 0)
+ return -errno;
+ ret = ftruncate(fd, size);
+ if (close(fd) || ret)
+ return -errno;
+ lte->size = size;
+ return 0;
}
-/* Unlink a non-directory or alternate data stream */
static int
wimfs_unlink(const char *path)
{
+ const struct wimfs_context *ctx = wimfs_get_context();
struct wim_dentry *dentry;
- struct wim_lookup_table_entry *lte;
- int ret;
u16 stream_idx;
- struct wimfs_context *ctx = wimfs_get_context();
+ int ret;
ret = wim_pathname_to_stream(ctx->wim, path, get_lookup_flags(ctx),
- &dentry, <e, &stream_idx);
+ &dentry, NULL, &stream_idx);
- if (ret != 0)
+ if (ret)
return ret;
if (inode_stream_name_nbytes(dentry->d_inode, stream_idx) == 0)
remove_dentry(dentry, ctx->wim->lookup_table);
else
- inode_remove_ads(dentry->d_inode, stream_idx - 1,
+ inode_remove_ads(dentry->d_inode,
+ &dentry->d_inode->i_ads_entries[stream_idx - 1],
ctx->wim->lookup_table);
return 0;
}
static int
wimfs_utimens(const char *path, const struct timespec tv[2])
{
- struct wim_inode *inode;
WIMStruct *wim = wimfs_get_WIMStruct();
+ struct wim_inode *inode;
inode = wim_pathname_to_inode(wim, path);
if (!inode)
static int
wimfs_utime(const char *path, struct utimbuf *times)
{
- struct wim_inode *inode;
WIMStruct *wim = wimfs_get_WIMStruct();
+ struct wim_inode *inode;
inode = wim_pathname_to_inode(wim, path);
if (!inode)
return -errno;
- inode->i_last_write_time = unix_timestamp_to_wim(times->modtime);
inode->i_last_access_time = unix_timestamp_to_wim(times->actime);
+ inode->i_last_write_time = unix_timestamp_to_wim(times->modtime);
return 0;
}
#endif /* !HAVE_UTIMENSAT */
-/* 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)
{
- struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh;
- int ret;
-
- if (!fd)
- return -EBADF;
-
- wimlib_assert(fd->f_lte != NULL);
- wimlib_assert(fd->f_lte->staging_file_name != NULL);
- wimlib_assert(filedes_valid(&fd->staging_fd));
- wimlib_assert(fd->f_inode != NULL);
+ struct wimfs_fd *fd = WIMFS_FD(fi);
+ ssize_t ret;
- /* Write the data. */
- ret = raw_pwrite(&fd->staging_fd, buf, size, offset);
- if (ret == -1)
+ ret = raw_pwrite(&fd->f_staging_fd, buf, size, offset);
+ if (ret < 0)
return -errno;
- /* Update file size */
- if (offset + size > fd->f_lte->size) {
- DEBUG("Update file size %"PRIu64 " => %"PRIu64"",
- fd->f_lte->size, offset + size);
+ if (offset + size > fd->f_lte->size)
fd->f_lte->size = offset + size;
- }
- /* Update timestamps */
touch_inode(fd->f_inode);
return ret;
}
static struct fuse_operations wimfs_operations = {
.chmod = wimfs_chmod,
.chown = wimfs_chown,
- .destroy = wimfs_destroy,
.fgetattr = wimfs_fgetattr,
.ftruncate = wimfs_ftruncate,
.getattr = wimfs_getattr,
-#ifdef ENABLE_XATTR
.getxattr = wimfs_getxattr,
-#endif
.link = wimfs_link,
-#ifdef ENABLE_XATTR
.listxattr = wimfs_listxattr,
-#endif
.mkdir = wimfs_mkdir,
.mknod = wimfs_mknod,
.open = wimfs_open,
.readdir = wimfs_readdir,
.readlink = wimfs_readlink,
.release = wimfs_release,
- .releasedir = wimfs_releasedir,
-#ifdef ENABLE_XATTR
+ .releasedir = wimfs_release,
.removexattr = wimfs_removexattr,
-#endif
.rename = wimfs_rename,
.rmdir = wimfs_rmdir,
-#ifdef ENABLE_XATTR
.setxattr = wimfs_setxattr,
-#endif
.symlink = wimfs_symlink,
.truncate = wimfs_truncate,
.unlink = wimfs_unlink,
#endif
.write = wimfs_write,
- /* wimfs keeps file descriptor structures (struct wimfs_fd), so there is
- * no need to have the file path provided on operations such as read()
- * where only the file descriptor is needed. */
+ /* We keep track of file descriptor structures (struct wimfs_fd), so
+ * there is no need to have the file path provided on operations such as
+ * read(). */
#if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8)
.flag_nullpath_ok = 1,
#endif
#endif
};
-
/* API function documented in wimlib.h */
WIMLIBAPI int
wimlib_mount_image(WIMStruct *wim, int image, const char *dir,
int mount_flags, const char *staging_dir)
{
- int argc;
- char *argv[16];
int ret;
- char *dir_copy;
struct wim_image_metadata *imd;
struct wimfs_context ctx;
- struct wim_inode *inode;
+ char *fuse_argv[16];
+ int fuse_argc;
- DEBUG("Mount: wim = %p, image = %d, dir = %s, flags = %d, ",
- wim, image, dir, mount_flags);
-
- if (!wim || !dir)
+ if (!wim || !dir || !*dir)
return WIMLIB_ERR_INVALID_PARAM;
if (mount_flags & ~(WIMLIB_MOUNT_FLAG_READWRITE |
WIMLIB_MOUNT_FLAG_ALLOW_OTHER))
return WIMLIB_ERR_INVALID_PARAM;
+ /* 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 (ret)
return ret;
}
+ /* Select the image to mount. */
ret = select_wim_image(wim, image);
if (ret)
return ret;
- DEBUG("Selected image %d", image);
-
+ /* Get the metadata for the image to mount. */
imd = wim_get_current_image_metadata(wim);
if (imd->modified) {
- /* wimfs_read() only supports a limited number of stream
- * locations, not including RESOURCE_IN_FILE_ON_DISK,
- * RESOURCE_IN_NTFS_VOLUME, etc. that might appear if files were
- * added to the WIM image. */
- ERROR("Cannot mount an image with newly added files!");
+ /* To avoid complicating things, we don't support mounting
+ * images to which in-memory modifications have already been
+ * made. */
+ ERROR("Cannot mount a modified WIM image!");
return WIMLIB_ERR_INVALID_PARAM;
}
- if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- ret = lock_wim(wim, wim->in_fd.fd);
- if (ret)
- return ret;
- }
+ ret = lock_wim_for_append(wim, wim->in_fd.fd);
+ if (ret)
+ return ret;
- /* Use default stream interface if one was not specified */
+ /* If the user did not specify an interface for accessing named
+ * data streams, use the default (extended attributes). */
if (!(mount_flags & (WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE |
- WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR |
- WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)))
+ WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR |
+ WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)))
mount_flags |= WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR;
- DEBUG("Initializing struct wimfs_context");
- init_wimfs_context(&ctx);
+ /* Start initializing the wimfs_context. */
+ memset(&ctx, 0, sizeof(struct wimfs_context));
ctx.wim = wim;
ctx.mount_flags = mount_flags;
- ctx.image_inode_list = &imd->inode_list;
- ctx.default_uid = getuid();
- ctx.default_gid = getgid();
- wimlib_assert(list_empty(&imd->unhashed_streams));
if (mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
ctx.default_lookup_flags = LOOKUP_FLAG_ADS_OK;
+ /* For read-write mount, create the staging directory. */
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ ret = make_staging_dir(&ctx, staging_dir);
+ if (ret)
+ goto out_unlock;
+ }
+ ctx.owner_uid = getuid();
+ ctx.owner_gid = getgid();
- DEBUG("Unlinking message queues in case they already exist");
- ret = set_message_queue_names(&ctx, dir);
- if (ret)
- goto out_unlock;
- unlink_message_queues(&ctx);
+ /* 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. */
+ INIT_LIST_HEAD(&ctx.orig_stream_list);
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ unsigned i;
+ struct wim_inode *inode;
+ struct wim_lookup_table_entry *lte;
- DEBUG("Preparing arguments to fuse_main()");
+ image_for_each_inode(inode, imd) {
+ for (i = 0; i <= inode->i_num_ads; i++) {
+ lte = inode_stream_lte(inode, i,
+ wim->lookup_table);
+ if (lte)
+ lte->out_refcnt = 0;
+ }
+ }
- dir_copy = STRDUP(dir);
- if (!dir_copy) {
- ret = WIMLIB_ERR_NOMEM;
- goto out_free_message_queue_names;
+ image_for_each_inode(inode, imd) {
+ for (i = 0; i <= inode->i_num_ads; i++) {
+ lte = inode_stream_lte(inode, i,
+ wim->lookup_table);
+ if (lte) {
+ if (lte->out_refcnt == 0)
+ list_add(<e->orig_stream_list,
+ &ctx.orig_stream_list);
+ lte->out_refcnt += inode->i_nlink;
+ lte->refcnt += inode->i_nlink;
+ }
+ }
+ }
}
- argc = 0;
- argv[argc++] = "wimlib";
- argv[argc++] = dir_copy;
+ /* Assign new inode numbers. */
+ reassign_inode_numbers(&ctx);
+
+ /* If a read-write mount, mark the image as modified. */
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)
+ imd->modified = 1;
+
+ /* Build the FUSE command line. */
- /* disable multi-threaded operation */
- argv[argc++] = "-s";
+ fuse_argc = 0;
+ fuse_argv[fuse_argc++] = "wimlib";
+ fuse_argv[fuse_argc++] = (char *)dir;
+ /* Disable multi-threaded operation. */
+ fuse_argv[fuse_argc++] = "-s";
+
+ /* Enable FUSE debug mode (don't fork) if requested by the user. */
if (mount_flags & WIMLIB_MOUNT_FLAG_DEBUG)
- argv[argc++] = "-d";
+ fuse_argv[fuse_argc++] = "-d";
/*
- * We provide the use_ino option to the FUSE mount because we are going
- * to assign inode numbers ourselves. */
+ * Build the FUSE mount options:
+ *
+ * use_ino
+ * FUSE will use the inode numbers we provide. We want this,
+ * because we have inodes and will number them ourselves.
+ *
+ * subtype=wimfs
+ * Name for our filesystem (main type is "fuse").
+ *
+ * hard_remove
+ * If an open file is unlinked, unlink it for real rather than
+ * renaming it to a hidden file. Our code supports this; an
+ * unlinked inode is retained until all its file descriptors have
+ * been closed.
+ *
+ * default_permissions
+ * FUSE will perform permission checking. Useful when
+ * WIMLIB_MOUNT_FLAG_UNIX_DATA is provided and the WIM image
+ * contains the UNIX permissions for each file.
+ *
+ * kernel_cache
+ * Cache the contents of files. This will speed up repeated access
+ * to files on a mounted WIM image, since they won't need to be
+ * decompressed repeatedly. This option is valid because data in
+ * the WIM image should never be changed externally. (Although, if
+ * someone really wanted to they could modify the WIM file or mess
+ * with the staging directory; but then they're asking for
+ * trouble.)
+ *
+ * entry_timeout=1000000000
+ * Cache positive name lookups indefinitely, since names can only
+ * be added, removed, or modified through the mounted filesystem
+ * itself.
+ *
+ * negative_timeout=1000000000
+ * Cache negative name lookups indefinitely, since names can only
+ * be added, removed, or modified through the mounted filesystem
+ * itself.
+ *
+ * attr_timeout=0
+ * Don't cache file/directory attributes. This is needed as a
+ * workaround for the fact that when caching attributes, the high
+ * level interface to libfuse considers a file which has several
+ * hard-linked names as several different files. (Otherwise, we
+ * could cache our file/directory attributes indefinitely, since
+ * they can only be changed through the mounted filesystem itself.)
+ */
char optstring[256] =
"use_ino"
",subtype=wimfs"
",attr_timeout=0"
-#if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8)
",hard_remove"
-#endif
",default_permissions"
+ ",kernel_cache"
+ ",entry_timeout=1000000000"
+ ",negative_timeout=1000000000"
+ ",attr_timeout=0"
;
- argv[argc++] = "-o";
- argv[argc++] = optstring;
- if ((mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
- /* Read-write mount. Make the staging directory */
- ret = make_staging_dir(&ctx, staging_dir);
- if (ret)
- goto out_free_dir_copy;
- } else {
- /* Read-only mount */
+ fuse_argv[fuse_argc++] = "-o";
+ fuse_argv[fuse_argc++] = optstring;
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE))
strcat(optstring, ",ro");
- }
if (mount_flags & WIMLIB_MOUNT_FLAG_ALLOW_OTHER)
strcat(optstring, ",allow_other");
- argv[argc] = NULL;
+ fuse_argv[fuse_argc] = NULL;
-#ifdef ENABLE_DEBUG
- {
- int i;
- DEBUG("FUSE command line (argc = %d): ", argc);
- for (i = 0; i < argc; i++) {
- fputs(argv[i], stdout);
- putchar(' ');
+ /* Mount our filesystem. */
+ ret = fuse_main(fuse_argc, fuse_argv, &wimfs_operations, &ctx);
+
+ /* Cleanup and return. */
+ if (ret)
+ ret = WIMLIB_ERR_FUSE;
+ release_extra_refcnts(&ctx);
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)
+ delete_staging_dir(&ctx);
+out_unlock:
+ unlock_wim_for_append(wim, wim->in_fd.fd);
+ return ret;
+}
+
+struct commit_progress_thread_args {
+ mqd_t mq;
+ wimlib_progress_func_t progfunc;
+ void *progctx;
+ int status;
+};
+
+static void *
+commit_progress_thread_proc(void *_args)
+{
+ struct commit_progress_thread_args *args = _args;
+ 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;
}
- putchar('\n');
- fflush(stdout);
+ if (ret < sizeof(report))
+ continue;
+ call_progress(args->progfunc, report.msg,
+ &report.info, args->progctx);
}
-#endif
+ return NULL;
+}
- /* Assign inode numbers. Also, if a read-write mount was requested,
- * mark the dentry tree as modified, and 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. */
- ctx.next_ino = 1;
- INIT_LIST_HEAD(&ctx.orig_stream_list);
- if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- imd->modified = 1;
- image_for_each_inode(inode, imd) {
- inode->i_ino = ctx.next_ino++;
- for (unsigned i = 0; i <= inode->i_num_ads; i++) {
- struct wim_lookup_table_entry *lte;
+static void
+generate_message_queue_name(char name[WIMFS_MQUEUE_NAME_LEN + 1])
+{
+ name[0] = '/';
+ memcpy(name + 1, "wimfs-", 6);
+ randomize_char_array_with_alnum(name + 7, WIMFS_MQUEUE_NAME_LEN - 7);
+ name[WIMFS_MQUEUE_NAME_LEN] = '\0';
+}
- lte = inode_stream_lte(inode, i, wim->lookup_table);
- if (lte)
- lte->out_refcnt = 0;
- }
- }
- image_for_each_inode(inode, imd) {
- for (unsigned i = 0; i <= inode->i_num_ads; i++) {
- struct wim_lookup_table_entry *lte;
+static mqd_t
+create_message_queue(const char *name, bool have_progfunc)
+{
+ bool am_root = (getuid() == 0);
+ mode_t umask_save = 0;
+ mode_t mode = 0600;
+ struct mq_attr attr;
+ mqd_t mq;
- lte = inode_stream_lte(inode, i,
- wim->lookup_table);
- if (lte) {
- if (lte->out_refcnt == 0)
- list_add(<e->orig_stream_list,
- &ctx.orig_stream_list);
- lte->out_refcnt += inode->i_nlink;
- lte->refcnt += inode->i_nlink;
- }
- }
+ 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);
+
+ 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;
+ }
+ mq = mq_open(name, O_RDWR | O_CREAT | O_EXCL, mode, &attr);
+ if (am_root)
+ umask(umask_save);
+ return mq;
+}
+
+/* Unmount a read-write mounted WIM image, committing the changes. */
+static int
+do_unmount_commit(const char *dir, int unmount_flags,
+ wimlib_progress_func_t progfunc, void *progctx)
+{
+ struct wimfs_unmount_info unmount_info;
+ mqd_t mq;
+ struct commit_progress_thread_args args;
+ pthread_t commit_progress_tid;
+ int ret;
+
+ 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
+ * committed. Create a thread to handle the progress messages. */
+ if (progfunc) {
+ args.mq = mq;
+ args.progfunc = progfunc;
+ args.progctx = progctx;
+ ret = pthread_create(&commit_progress_tid, NULL,
+ commit_progress_thread_proc, &args);
+ if (ret) {
+ errno = ret;
+ ERROR_WITH_ERRNO("Can't create thread");
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_delete_mq;
}
- } else {
- image_for_each_inode(inode, imd)
- inode->i_ino = ctx.next_ino++;
+ unmount_info.unmount_flags |= WIMLIB_UNMOUNT_FLAG_SEND_PROGRESS;
}
- DEBUG("(next_ino = %"PRIu64")", ctx.next_ino);
+ 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;
+
+ if (progfunc) {
+ /* Terminate the progress thread and retrieve final unmount
+ * status. */
- DEBUG("Calling fuse_main()");
+ int tmp = -1;
+ mq_send(mq, (const char *)&tmp, sizeof(int), 1);
- ret = fuse_main(argc, argv, &wimfs_operations, &ctx);
+ pthread_join(commit_progress_tid, NULL);
+ if (!ret && args.status != -1)
+ ret = args.status;
+ } else if (!ret) {
+ /* Retrieve the final unmount status. */
- DEBUG("Returned from fuse_main() (ret = %d)", ret);
+ int tmp = -1;
+ int len;
- if (ret) {
- ret = WIMLIB_ERR_FUSE;
- } else {
- if (ctx.have_status)
- ret = ctx.status;
+ 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_TIMEOUT;
- }
- if (ctx.daemon_to_unmount_mq != (mqd_t)(-1)) {
- send_unmount_finished_msg(ctx.daemon_to_unmount_mq, ret);
- close_message_queues(&ctx);
+ ret = WIMLIB_ERR_NOT_A_MOUNTPOINT;
}
+out_delete_mq:
+ mq_close(mq);
+ mq_unlink(unmount_info.mq_name);
+ return ret;
+}
- release_extra_refcnts(&ctx);
+/* 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;
+}
- /* Try to delete the staging directory if a deletion wasn't yet
- * attempted due to an earlier error */
- if (ctx.staging_dir_name)
- delete_staging_dir(&ctx);
-out_free_dir_copy:
- FREE(dir_copy);
-out_unlock:
- wim->wim_locked = 0;
-out_free_message_queue_names:
- free_message_queue_names(&ctx);
- return ret;
+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 mounted_image;
+ int wim_filename_len;
+ union wimlib_progress_info progress;
+
+ if (getxattr(dir, "wimfs.mount_flags",
+ &mount_flags, sizeof(int)) != sizeof(int))
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+
+ *mount_flags_ret = mount_flags;
+
+ if (!progfunc)
+ return 0;
+
+ if (getxattr(dir, "wimfs.mounted_image",
+ &mounted_image, sizeof(int)) != sizeof(int))
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+
+ wim_filename_len = getxattr(dir, "wimfs.wim_filename", NULL, 0);
+ if (wim_filename_len < 0)
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+
+ char wim_filename[wim_filename_len + 1];
+ if (getxattr(dir, "wimfs.wim_filename",
+ wim_filename, wim_filename_len) != wim_filename_len)
+ return WIMLIB_ERR_NOT_A_MOUNTPOINT;
+ wim_filename[wim_filename_len] = '\0';
+
+ progress.unmount.mountpoint = dir;
+ progress.unmount.mounted_wim = wim_filename;
+ progress.unmount.mounted_image = mounted_image;
+ progress.unmount.mount_flags = mount_flags;
+ progress.unmount.unmount_flags = unmount_flags;
+
+ return call_progress(progfunc, WIMLIB_PROGRESS_MSG_UNMOUNT_BEGIN,
+ &progress, progctx);
}
/* API function documented in wimlib.h */
WIMLIBAPI int
-wimlib_unmount_image_with_progress(const tchar *dir, int unmount_flags,
+wimlib_unmount_image_with_progress(const char *dir, int unmount_flags,
wimlib_progress_func_t progfunc, void *progctx)
{
+ int mount_flags;
int ret;
- struct wimfs_context wimfs_ctx;
+
+ wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
if (unmount_flags & ~(WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY |
WIMLIB_UNMOUNT_FLAG_COMMIT |
WIMLIB_UNMOUNT_FLAG_REBUILD |
WIMLIB_UNMOUNT_FLAG_RECOMPRESS |
- WIMLIB_UNMOUNT_FLAG_LAZY |
+ WIMLIB_UNMOUNT_FLAG_FORCE |
WIMLIB_UNMOUNT_FLAG_NEW_IMAGE))
return WIMLIB_ERR_INVALID_PARAM;
- init_wimfs_context(&wimfs_ctx);
-
- ret = set_message_queue_names(&wimfs_ctx, dir);
- if (ret != 0)
- goto out;
-
- ret = open_message_queues(&wimfs_ctx, false);
- if (ret != 0)
- goto out_free_message_queue_names;
-
- ret = send_unmount_request_msg(wimfs_ctx.unmount_to_daemon_mq,
- unmount_flags,
- progfunc != NULL);
- if (ret != 0)
- goto out_close_message_queues;
-
- ret = execute_fusermount(dir, (unmount_flags & WIMLIB_UNMOUNT_FLAG_LAZY) != 0);
- if (ret != 0)
- goto out_close_message_queues;
-
- struct unmount_msg_handler_context handler_ctx = {
- .hdr = {
- .timeout_seconds = 5,
- },
- .daemon_pid = 0,
- .progfunc = progfunc,
- .progctx = progctx,
- };
-
- ret = message_loop(wimfs_ctx.daemon_to_unmount_mq,
- &unmount_msg_handler_callbacks,
- &handler_ctx.hdr);
- if (ret == 0)
- ret = handler_ctx.status;
-out_close_message_queues:
- close_message_queues(&wimfs_ctx);
-out_free_message_queue_names:
- free_message_queue_names(&wimfs_ctx);
-out:
- return ret;
+ ret = begin_unmount(dir, unmount_flags, &mount_flags,
+ progfunc, progctx);
+ if (ret)
+ return ret;
+
+ if ((unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) &&
+ (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE))
+ return do_unmount_commit(dir, unmount_flags,
+ progfunc, progctx);
+ else
+ return do_unmount_discard(dir);
}
#else /* WITH_FUSE */
#endif /* !WITH_FUSE */
-
WIMLIBAPI int
wimlib_unmount_image(const tchar *dir, int unmount_flags)
{
git://wimlib.net / wimlib / commitdiff