X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fmount.c;h=b1d7381072f224de30778839dba6847890f3b1bb;hp=9e285c6c739da4fc5191b42ac48a1347dcd8f209;hb=234772d171811db50c2945c091d5a5aa9040cfac;hpb=3c849b4c439224b08183413f34cf97c3ab0721a3 diff --git a/src/mount.c b/src/mount.c index 9e285c6c..b1d73810 100644 --- a/src/mount.c +++ b/src/mount.c @@ -13,22 +13,23 @@ * This file is part of wimlib, a library for working with WIM files. * * wimlib is free software; you can redistribute it and/or modify it under the - * terms of the GNU Lesser General Public License as published by the Free - * Software Foundation; either version 2.1 of the License, or (at your option) + * terms of the GNU General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at your option) * any later version. * * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more + * A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * - * You should have received a copy of the GNU Lesser General Public License + * You should have received a copy of the GNU General Public License * along with wimlib; if not, see http://www.gnu.org/licenses/. */ #include "wimlib_internal.h" #ifdef WITH_FUSE + #include "sha1.h" #include "lookup_table.h" #include "xml.h" @@ -44,13 +45,19 @@ #include #include #include +#include + +#ifdef ENABLE_XATTR +#include +#endif +/* File descriptor to a file open on the WIM filesystem. */ struct wimlib_fd { - u16 idx; - int staging_fd; - u64 hard_link_group; + struct inode *inode; struct lookup_table_entry *lte; - struct dentry *dentry; + int staging_fd; + u16 idx; + u32 stream_id; }; /* The WIMStruct for the mounted WIM. */ @@ -73,6 +80,11 @@ static int mount_flags; /* Name of the directory on which the WIM file is mounted. */ static const char *mount_dir; +/* Next inode number to be assigned. */ +static u64 next_ino; + +/* List of lookup table entries in the staging directory */ +static LIST_HEAD(staging_list); static inline int get_lookup_flags() { @@ -82,67 +94,204 @@ static inline int get_lookup_flags() return 0; } +/* Returns nonzero if write permission is requested on the file open flags */ static inline int flags_writable(int open_flags) { return open_flags & (O_RDWR | O_WRONLY); } -static int alloc_wimlib_fd(struct lookup_table_entry *lte, +static int alloc_wimlib_fd(struct inode *inode, + u32 stream_id, + struct lookup_table_entry *lte, struct wimlib_fd **fd_ret) { static const u16 fds_per_alloc = 8; static const u16 max_fds = 0xffff; - if (lte->num_opened_fds == lte->num_allocated_fds) { + DEBUG("Allocating fd for stream ID %u from inode %lx (open = %u, allocated = %u)", + stream_id, inode->ino, inode->num_opened_fds, + inode->num_allocated_fds); + + if (inode->num_opened_fds == inode->num_allocated_fds) { struct wimlib_fd **fds; u16 num_new_fds; - if (lte->num_allocated_fds == max_fds) - return -ENFILE; - num_new_fds = min(fds_per_alloc, max_fds - lte->num_allocated_fds); + if (inode->num_allocated_fds == max_fds) + return -EMFILE; + num_new_fds = min(fds_per_alloc, max_fds - inode->num_allocated_fds); - fds = CALLOC(lte->num_allocated_fds + num_new_fds, - sizeof(lte->fds[0])); + fds = REALLOC(inode->fds, (inode->num_allocated_fds + num_new_fds) * + sizeof(inode->fds[0])); if (!fds) return -ENOMEM; - memcpy(fds, lte->fds, - lte->num_allocated_fds * sizeof(lte->fds[0])); - FREE(lte->fds); - lte->fds = fds; - lte->num_allocated_fds += num_new_fds; + memset(&fds[inode->num_allocated_fds], 0, + num_new_fds * sizeof(fds[0])); + inode->fds = fds; + inode->num_allocated_fds += num_new_fds; } for (u16 i = 0; ; i++) { - if (!lte->fds[i]) { + if (!inode->fds[i]) { struct wimlib_fd *fd = CALLOC(1, sizeof(*fd)); if (!fd) return -ENOMEM; + fd->inode = inode; + fd->lte = lte; fd->staging_fd = -1; fd->idx = i; - fd->lte = lte; - lte->fds[i] = fd; - lte->num_opened_fds++; + fd->stream_id = stream_id; *fd_ret = fd; + inode->fds[i] = fd; + inode->num_opened_fds++; + if (lte) + lte->num_opened_fds++; + DEBUG("Allocated fd"); return 0; } } } -static int close_wimlib_fd(struct wimlib_fd *fd) +static void inode_put_fd(struct inode *inode, struct wimlib_fd *fd) { - struct lookup_table_entry *lte = fd->lte; + wimlib_assert(fd); + wimlib_assert(inode); + wimlib_assert(fd->inode == inode); + wimlib_assert(inode->num_opened_fds); + wimlib_assert(fd->idx < inode->num_opened_fds); + wimlib_assert(inode->fds[fd->idx] == fd); + + inode->fds[fd->idx] = NULL; + FREE(fd); + if (--inode->num_opened_fds == 0 && inode->link_count == 0) + free_inode(inode); +} + +static int lte_put_fd(struct lookup_table_entry *lte, struct wimlib_fd *fd) +{ + wimlib_assert(fd); + wimlib_assert(fd->lte == lte); + + if (!lte) /* Empty stream with no lookup table entry */ + return 0; - wimlib_assert(lte); wimlib_assert(lte->num_opened_fds); - if (lte->staging_file_name) { + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(lte->staging_file_name); wimlib_assert(fd->staging_fd != -1); if (close(fd->staging_fd) != 0) return -errno; } - if (--lte->num_opened_fds == 0 && lte->refcnt == 0) - free_lookup_table_entry(lte); - lte->fds[fd->idx] = NULL; - FREE(fd); + lte_decrement_num_opened_fds(lte, w->lookup_table); + return 0; +} + +static int close_wimlib_fd(struct wimlib_fd *fd) +{ + int ret; + DEBUG("Closing fd (inode = %lu, opened = %u, allocated = %u)", + fd->inode->ino, fd->inode->num_opened_fds, + fd->inode->num_allocated_fds); + ret = lte_put_fd(fd->lte, fd); + if (ret != 0) + return ret; + + inode_put_fd(fd->inode, fd); + return 0; +} + +/* Remove a dentry; i.e. remove a reference to the inode. + * + * If there are no remaining references to the inode either through detnries or + * open file descriptors, the inode is freed. + * + * All lookup table entries referenced by the inode have their reference count + * decremented. If a lookup table entry has no open file descriptors and no + * references remaining, it is freed, and the staging file is unlinked. + * + * Otherwise, the inode is not removed, but the dentry is unlinked and freed. */ +static void remove_dentry(struct dentry *dentry, + struct lookup_table *lookup_table) +{ + struct inode *inode = dentry->inode; + struct lookup_table_entry *lte; + unsigned i; + + for (i = 0; i <= inode->num_ads; i++) { + lte = inode_stream_lte_resolved(inode, i); + if (lte) + lte_decrement_refcnt(lte, lookup_table); + } + unlink_dentry(dentry); + put_dentry(dentry); +} + +/* Remove an alternate data stream from the inode */ +static void inode_remove_ads(struct inode *inode, u16 idx, + struct lookup_table *lookup_table) +{ + struct ads_entry *ads_entry; + struct lookup_table_entry *lte; + + ads_entry = inode->ads_entries[idx]; + + wimlib_assert(ads_entry); + + lte = ads_entry->lte; + + if (lte) + lte_decrement_refcnt(lte, lookup_table); + + free_ads_entry(ads_entry); + + wimlib_assert(inode->num_ads); + memcpy(&inode->ads_entries[idx], + &inode->ads_entries[idx + 1], + (inode->num_ads - idx - 1) * sizeof(inode->ads_entries[0])); + inode->num_ads--; +} + +/* Transfers file attributes from a struct inode to a `stat' buffer. + * + * 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. */ +int inode_to_stbuf(const struct inode *inode, struct lookup_table_entry *lte, + struct stat *stbuf) +{ + if (inode_is_symlink(inode)) + stbuf->st_mode = S_IFLNK | 0777; + else if (inode_is_directory(inode)) + stbuf->st_mode = S_IFDIR | 0755; + else + stbuf->st_mode = S_IFREG | 0644; + + stbuf->st_ino = (ino_t)inode->ino; + stbuf->st_nlink = inode->link_count; + stbuf->st_uid = getuid(); + stbuf->st_gid = getgid(); + + if (lte) { + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE); + wimlib_assert(lte->staging_file_name); + struct stat native_stat; + if (stat(lte->staging_file_name, &native_stat) != 0) { + DEBUG("Failed to stat `%s': %m", + lte->staging_file_name); + return -errno; + } + stbuf->st_size = native_stat.st_size; + } else { + stbuf->st_size = lte->resource_entry.original_size; + } + } else { + stbuf->st_size = 0; + } + + stbuf->st_atime = wim_timestamp_to_unix(inode->last_access_time); + stbuf->st_mtime = wim_timestamp_to_unix(inode->last_write_time); + stbuf->st_ctime = wim_timestamp_to_unix(inode->creation_time); + stbuf->st_blocks = (stbuf->st_size + 511) / 512; return 0; } @@ -162,7 +311,7 @@ static int create_staging_file(char **name_ret, int open_flags) int fd; int errno_save; - name_len = staging_dir_name_len + 1 + WIM_HASH_SIZE; + name_len = staging_dir_name_len + 1 + SHA1_HASH_SIZE; name = MALLOC(name_len + 1); if (!name) { errno = ENOMEM; @@ -174,7 +323,7 @@ static int create_staging_file(char **name_ret, int open_flags) memcpy(name, staging_dir_name, staging_dir_name_len); name[staging_dir_name_len] = '/'; randomize_char_array_with_alnum(name + staging_dir_name_len + 1, - WIM_HASH_SIZE); + SHA1_HASH_SIZE); name[name_len] = '\0'; @@ -204,15 +353,19 @@ static int create_staging_file(char **name_ret, int open_flags) /* * Extract a WIM resource to the staging directory. * - * We need to: - * - Create a staging file for the WIM resource - * - Extract the resource to it - * - Create a new lte for the file resource - * - Transfer fds from the old lte to the new lte, but - * only if they share the same hard link group as this - * dentry + * @inode: Inode that contains the stream we are extracting + * + * @stream_id: Identifier for the stream (it stays constant even if the indices + * of the stream entries are changed) + * + * @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 + * + * @size: Number of bytes of the stream we want to extract (this supports the + * wimfs_truncate() function). */ -static int extract_resource_to_staging_dir(struct dentry *dentry, +static int extract_resource_to_staging_dir(struct inode *inode, + u32 stream_id, struct lookup_table_entry **lte, off_t size) { @@ -220,16 +373,14 @@ static int extract_resource_to_staging_dir(struct dentry *dentry, int ret; int fd; struct lookup_table_entry *old_lte, *new_lte; - size_t link_group_size; - + old_lte = *lte; fd = create_staging_file(&staging_file_name, O_WRONLY); if (fd == -1) return -errno; if (old_lte) - ret = extract_resource_to_fd(w, &old_lte->resource_entry, fd, - size); + ret = extract_wim_resource_to_fd(old_lte, fd, size); else ret = 0; if (ret != 0 || close(fd) != 0) { @@ -238,79 +389,109 @@ static int extract_resource_to_staging_dir(struct dentry *dentry, else ret = -EIO; close(fd); - unlink(staging_file_name); - FREE(staging_file_name); - return ret; + goto out_delete_staging_file; } - link_group_size = dentry_link_group_size(dentry); + if (old_lte && inode->link_count == 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 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(w->lookup_table, old_lte); + new_lte = old_lte; + } else { + if (old_lte) { + /* There's an existing lookup table entry, but its + * reference count is creater 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->link_count); + DEBUG("Splitting lookup table entry " + "(inode->link_count = %zu, old_lte->refcnt = %u)", + inode->link_count, old_lte->refcnt); - if (old_lte) { - if (link_group_size == old_lte->refcnt) { - /* This hard link group is the only user of the lookup - * table entry, so we can re-use it. */ - lookup_table_remove(w->lookup_table, old_lte); - new_lte = old_lte; - } else { - /* Split a hard link group away from the "lookup table - * entry" hard link group (i.e. we had two hard link - * groups that were identical, but now we are changing - * one of them) */ - - /* XXX The ADS really complicate things here and not - * everything is going to work correctly yet. For - * example it could be the same that a file contains two - * file streams that are identical and therefore share - * the same lookup table entry despite the fact that the - * streams themselves are not hardlinked. */ - wimlib_assert(old_lte->refcnt > link_group_size); - - new_lte = new_lookup_table_entry(); - if (!new_lte) - return -ENOMEM; + } - u16 num_transferred_fds = 0; - for (u16 i = 0; i < old_lte->num_allocated_fds; i++) { - if (old_lte->fds[i] && - old_lte->fds[i]->dentry->hard_link == - dentry->hard_link) - { - num_transferred_fds++; - } - } - new_lte->fds = MALLOC(num_transferred_fds * - sizeof(new_lte->fds[0])); - if (!new_lte->fds) { - free_lookup_table_entry(new_lte); - return -ENOMEM; - } - u16 j = 0; - for (u16 i = 0; i < old_lte->num_allocated_fds; i++) { - if (old_lte->fds[i] && - old_lte->fds[i]->dentry->hard_link == - dentry->hard_link) - { - struct wimlib_fd *fd = old_lte->fds[i]; - old_lte->fds[i] = NULL; + new_lte = new_lookup_table_entry(); + if (!new_lte) { + ret = -ENOMEM; + goto out_delete_staging_file; + } + + /* There may already be open file descriptors to this stream if + * it's previously been opened read-only, but just now we're + * opening it read-write. Identify those file descriptors and + * change their lookup table entry pointers to point to the new + * lookup table entry, and open staging file descriptors for + * them. + * + * 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. */ + for (u16 i = 0, j = 0; j < inode->num_opened_fds; i++) { + struct wimlib_fd *fd = inode->fds[i]; + if (fd) { + if (fd->stream_id == stream_id) { + wimlib_assert(fd->lte == old_lte); fd->lte = new_lte; - fd->idx = j; - new_lte->fds[j] = fd; + new_lte->num_opened_fds++; + fd->staging_fd = open(staging_file_name, O_RDONLY); + if (fd->staging_fd == -1) { + ret = -errno; + goto out_revert_fd_changes; + } } + j++; } - old_lte->refcnt -= link_group_size; - old_lte->num_opened_fds -= j; - new_lte->num_opened_fds = j; - - } + } + DEBUG("%zu 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->link_count; + } } + new_lte->resource_entry.original_size = size; - new_lte->refcnt = link_group_size; - randomize_byte_array(new_lte->hash, WIM_HASH_SIZE); + new_lte->refcnt = inode->link_count; + random_hash(new_lte->hash); new_lte->staging_file_name = staging_file_name; + new_lte->resource_location = RESOURCE_IN_STAGING_FILE; + + if (stream_id == 0) + inode->lte = new_lte; + else + for (u16 i = 0; i < inode->num_ads; i++) + if (inode->ads_entries[i]->stream_id == stream_id) + inode->ads_entries[i]->lte = new_lte; lookup_table_insert(w->lookup_table, new_lte); + list_add(&new_lte->staging_list, &staging_list); *lte = new_lte; return 0; +out_revert_fd_changes: + for (u16 i = 0, j = 0; j < new_lte->num_opened_fds; i++) { + struct wimlib_fd *fd = inode->fds[i]; + if (fd && fd->stream_id == stream_id && fd->lte == new_lte) { + fd->lte = old_lte; + if (fd->staging_fd != -1) { + close(fd->staging_fd); + fd->staging_fd = -1; + } + j++; + } + } +out_free_new_lte: + free_lookup_table_entry(new_lte); +out_delete_staging_file: + unlink(staging_file_name); + FREE(staging_file_name); + return ret; } /* @@ -353,7 +534,7 @@ static void make_staging_dir() } static int remove_file_or_directory(const char *fpath, const struct stat *sb, - int typeflag, struct FTW *ftwbuf) + int typeflag, struct FTW *ftwbuf) { if (remove(fpath) == 0) return 0; @@ -365,7 +546,7 @@ static int remove_file_or_directory(const char *fpath, const struct stat *sb, /* * Deletes the staging directory and all the files contained in it. */ -static inline int delete_staging_dir() +static int delete_staging_dir() { int ret; @@ -382,23 +563,21 @@ static inline int delete_staging_dir() * commands */ static char *unmount_to_daemon_mq_name; static char *daemon_to_unmount_mq_name; -static int unmount_to_daemon_mq; -static int daemon_to_unmount_mq; +static mqd_t unmount_to_daemon_mq; +static mqd_t daemon_to_unmount_mq; /* Simple function that returns the concatenation of 4 strings. */ static char *strcat_dup(const char *s1, const char *s2, const char *s3, - const char *s4) + const char *s4) { size_t len = strlen(s1) + strlen(s2) + strlen(s3) + strlen(s4) + 1; char *p = MALLOC(len); if (!p) return NULL; - *p = '\0'; - strcat(p, s1); - strcat(p, s2); - strcat(p, s3); - strcat(p, s4); - return p; + p = strcpy(p, s1); + p = strcat(p, s2); + p = strcat(p, s3); + return strcat(p, s4); } /* Removes trailing forward slashes in a string. */ @@ -471,7 +650,7 @@ static int open_message_queues(bool daemon) unmount_to_daemon_mq = mq_open(unmount_to_daemon_mq_name, flags, 0700, NULL); - if (unmount_to_daemon_mq == -1) { + if (unmount_to_daemon_mq == (mqd_t)-1) { ERROR_WITH_ERRNO("mq_open()"); ret = WIMLIB_ERR_MQUEUE; goto err2; @@ -485,7 +664,7 @@ static int open_message_queues(bool daemon) daemon_to_unmount_mq = mq_open(daemon_to_unmount_mq_name, flags, 0700, NULL); - if (daemon_to_unmount_mq == -1) { + if (daemon_to_unmount_mq == (mqd_t)-1) { ERROR_WITH_ERRNO("mq_open()"); ret = WIMLIB_ERR_MQUEUE; goto err3; @@ -545,62 +724,96 @@ static int wimfs_access(const char *path, int mask) return 0; } +#if 0 /* Closes the staging file descriptor associated with the lookup table entry, if * it is opened. */ -static int close_lte_fds(struct lookup_table_entry *lte, void *ignore) +static int close_lte_fds(struct lookup_table_entry *lte) { - for (u16 i = 0; i < lte->num_opened_fds; i++) { + for (u16 i = 0, j = 0; j < lte->num_opened_fds; i++) { if (lte->fds[i] && lte->fds[i]->staging_fd != -1) { + wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE); + wimlib_assert(lte->staging_file_name); if (close(lte->fds[i]->staging_fd) != 0) { ERROR_WITH_ERRNO("Failed close file `%s'", lte->staging_file_name); return WIMLIB_ERR_WRITE; } + j++; } } return 0; } +static void lte_list_change_lte_ptr(struct lookup_table_entry *lte, + struct lookup_table_entry *newptr) +{ + struct list_head *pos; + struct stream_list_head *head; + list_for_each(pos, <e->lte_group_list) { + head = container_of(pos, struct stream_list_head, list); + if (head->type == STREAM_TYPE_ADS) { + struct ads_entry *ads_entry; + ads_entry = container_of(head, struct ads_entry, lte_group_list); + + ads_entry->lte = newptr; + } else { + wimlib_assert(head->type == STREAM_TYPE_NORMAL); -/* Calculates the SHA1 sum for @dentry if its file resource is in a staging - * file. Updates the SHA1 sum in the dentry and the lookup table entry. If - * there is already a lookup table entry with the same checksum, increment its - * reference count and destroy the lookup entry with the updated checksum. */ -static int calculate_sha1sum_for_staging_file(struct dentry *dentry, - void *_lookup_table) + struct dentry *dentry; + dentry = container_of(head, struct dentry, lte_group_list); + + dentry->lte = newptr; + } + } +} +#endif + + +static int update_lte_of_staging_file(struct lookup_table_entry *lte, + struct lookup_table *table) { - struct lookup_table *lookup_table = _lookup_table; - u8 *hash = dentry->hash; - u16 i = 0; - while (1) { - struct lookup_table_entry *lte = __lookup_resource(lookup_table, hash); - if (lte && lte->staging_file_name) { - struct lookup_table_entry *existing; - int ret; - - DEBUG("Calculating SHA1 hash for file `%s'", - dentry->file_name_utf8); - ret = sha1sum(lte->staging_file_name, lte->hash); - if (ret != 0) - return ret; - - lookup_table_unlink(lookup_table, lte); - memcpy(hash, lte->hash, WIM_HASH_SIZE); - existing = __lookup_resource(lookup_table, hash); - if (existing) { - DEBUG("Merging duplicate lookup table entries for file " - "`%s'", dentry->file_name_utf8); - free_lookup_table_entry(lte); - existing->refcnt++; - } else { - lookup_table_insert(lookup_table, lte); - } + struct lookup_table_entry *duplicate_lte; + int ret; + u8 hash[SHA1_HASH_SIZE]; + struct stat stbuf; + + wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE); + wimlib_assert(lte->staging_file_name); + + ret = sha1sum(lte->staging_file_name, hash); + if (ret != 0) + return ret; + + lookup_table_unlink(table, lte); + + duplicate_lte = __lookup_resource(table, hash); + + if (duplicate_lte) { + /* Merge duplicate lookup table entries */ + +#if 0 + lte_list_change_lte_ptr(lte, duplicate_lte); +#endif + duplicate_lte->refcnt += lte->refcnt; +#if 0 + list_splice(<e->lte_group_list, + &duplicate_lte->lte_group_list); +#endif + + free_lookup_table_entry(lte); + } else { + if (stat(lte->staging_file_name, &stbuf) != 0) { + ERROR_WITH_ERRNO("Failed to stat `%s'", lte->staging_file_name); + return WIMLIB_ERR_STAT; } - if (i == dentry->num_ads) - break; - hash = dentry->ads_entries[i].hash; - i++; + wimlib_assert(<e->file_on_disk == <e->staging_file_name); + lte->resource_location = RESOURCE_IN_FILE_ON_DISK; + copy_hash(lte->hash, hash); + lte->resource_entry.original_size = stbuf.st_size; + lte->resource_entry.size = stbuf.st_size; + lookup_table_insert(table, lte); } + return 0; } @@ -608,26 +821,25 @@ static int calculate_sha1sum_for_staging_file(struct dentry *dentry, static int rebuild_wim(WIMStruct *w, bool check_integrity) { int ret; - struct dentry *root; + struct lookup_table_entry *lte, *tmp; - root = wim_root_dentry(w); - - DEBUG("Closing all staging file descriptors."); /* Close all the staging file descriptors. */ - ret = for_lookup_table_entry(w->lookup_table, close_lte_fds, NULL); - if (ret != 0) { - ERROR("Failed to close all staging files"); - return ret; +#if 0 + DEBUG("Closing all staging file descriptors."); + list_for_each_entry(lte, &staging_list, staging_list) { + ret = close_lte_fds(lte); + if (ret != 0) + return ret; } +#endif - DEBUG("Calculating SHA1 checksums for all new staging files."); /* Calculate SHA1 checksums for all staging files, and merge unnecessary * lookup table entries. */ - ret = for_dentry_in_tree(root, calculate_sha1sum_for_staging_file, - w->lookup_table); - if (ret != 0) { - ERROR("Failed to calculate new SHA1 checksums"); - return ret; + DEBUG("Calculating SHA1 checksums for all new staging files."); + list_for_each_entry_safe(lte, tmp, &staging_list, staging_list) { + ret = update_lte_of_staging_file(lte, w->lookup_table); + if (ret != 0) + return ret; } xml_update_image_info(w, w->current_image); @@ -643,7 +855,6 @@ static int rebuild_wim(WIMStruct *w, bool check_integrity) /* Called when the filesystem is unmounted. */ static void wimfs_destroy(void *p) { - /* For read-write mounts, the `imagex unmount' command, which is * running in a separate process and is executing the * wimlib_unmount() function, will send this process a byte @@ -708,18 +919,38 @@ static void wimfs_destroy(void *p) if (status == 0) status = ret; } + } else { + DEBUG("Read-only mount"); } done: + DEBUG("Sending status %u", status); ret = mq_send(daemon_to_unmount_mq, &status, 1, 1); if (ret == -1) ERROR_WITH_ERRNO("Failed to send status to unmount process"); close_message_queues(); } +#if 0 +static int wimfs_fallocate(const char *path, int mode, + off_t offset, off_t len, struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + wimlib_assert(fd->staging_fd != -1); + return fallocate(fd->staging_fd, mode, offset, len); +} + +static int wimfs_fgetattr(const char *path, struct stat *stbuf, + struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + return dentry_to_stbuf(fd->dentry, stbuf); +} +#endif + static int wimfs_ftruncate(const char *path, off_t size, struct fuse_file_info *fi) { - struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh; + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; int ret = ftruncate(fd->staging_fd, size); if (ret != 0) return ret; @@ -732,13 +963,141 @@ static int wimfs_ftruncate(const char *path, off_t size, */ static int wimfs_getattr(const char *path, struct stat *stbuf) { - struct dentry *dentry = get_dentry(w, path); + struct dentry *dentry; + struct lookup_table_entry *lte; + int ret; + + ret = lookup_resource(w, path, + get_lookup_flags() | LOOKUP_FLAG_DIRECTORY_OK, + &dentry, <e, NULL); + if (ret != 0) + return ret; + return inode_to_stbuf(dentry->inode, lte, stbuf); +} + +#ifdef ENABLE_XATTR +/* Read an alternate data stream through the XATTR interface, or get its size */ +static int wimfs_getxattr(const char *path, const char *name, char *value, + size_t size) +{ + int ret; + struct dentry *dentry; + struct ads_entry *ads_entry; + size_t res_size; + struct lookup_table_entry *lte; + + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + dentry = get_dentry(w, path); if (!dentry) return -ENOENT; - dentry_to_stbuf(dentry, stbuf, w->lookup_table); + ads_entry = inode_get_ads_entry(dentry->inode, name, NULL); + if (!ads_entry) + return -ENOATTR; + + lte = ads_entry->lte; + res_size = wim_resource_size(lte); + + if (size == 0) + return res_size; + if (res_size > size) + return -ERANGE; + ret = read_full_wim_resource(lte, (u8*)value); + if (ret != 0) + return -EIO; + return res_size; +} +#endif + +/* Create a hard link */ +static int wimfs_link(const char *to, const char *from) +{ + struct dentry *to_dentry, *from_dentry, *from_dentry_parent; + const char *link_name; + struct inode *inode; + unsigned i; + struct lookup_table_entry *lte; + + to_dentry = get_dentry(w, to); + if (!to_dentry) + return -ENOENT; + + inode = to_dentry->inode; + + if (!inode_is_regular_file(inode)) + return -EPERM; + + from_dentry_parent = get_parent_dentry(w, from); + if (!from_dentry_parent) + return -ENOENT; + if (!dentry_is_directory(from_dentry_parent)) + return -ENOTDIR; + + link_name = path_basename(from); + if (get_dentry_child_with_name(from_dentry_parent, link_name)) + return -EEXIST; + from_dentry = new_dentry(link_name); + if (!from_dentry) + return -ENOMEM; + + + inode_add_dentry(from_dentry, inode); + from_dentry->inode = inode; + inode->link_count++; + + for (i = 0; i <= inode->num_ads; i++) { + lte = inode_stream_lte_resolved(inode, i); + if (lte) + lte->refcnt++; + } + + link_dentry(from_dentry, from_dentry_parent); return 0; } +#ifdef ENABLE_XATTR +static int wimfs_listxattr(const char *path, char *list, size_t size) +{ + struct dentry *dentry; + int ret; + char *p = list; + size_t needed_size; + unsigned i; + struct inode *inode; + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + /* List alternate data streams, or get the list size */ + + ret = lookup_resource(w, path, get_lookup_flags(), &dentry, NULL, NULL); + if (ret != 0) + return ret; + inode = dentry->inode; + + if (size == 0) { + needed_size = 0; + for (i = 0; i < inode->num_ads; i++) + needed_size += inode->ads_entries[i]->stream_name_utf8_len + 6; + return needed_size; + } else { + for (i = 0; i < inode->num_ads; i++) { + needed_size = inode->ads_entries[i]->stream_name_utf8_len + 6; + if (needed_size > size) + return -ERANGE; + p += sprintf(p, "user.%s", + inode->ads_entries[i]->stream_name_utf8) + 1; + size -= needed_size; + } + return p - list; + } +} +#endif + /* * Create a directory in the WIM. * @mode is currently ignored. @@ -760,8 +1119,10 @@ static int wimfs_mkdir(const char *path, mode_t mode) if (get_dentry_child_with_name(parent, basename)) return -EEXIST; - newdir = new_dentry(basename); - newdir->attributes |= FILE_ATTRIBUTE_DIRECTORY; + newdir = new_dentry_with_inode(basename); + newdir->inode->attributes |= FILE_ATTRIBUTE_DIRECTORY; + newdir->inode->resolved = true; + newdir->inode->ino = next_ino++; link_dentry(newdir, parent); return 0; } @@ -773,21 +1134,28 @@ static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev) const char *stream_name; if ((mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS) && (stream_name = path_stream_name(path))) { + /* Make an alternate data stream */ struct ads_entry *new_entry; struct dentry *dentry; + char *p = (char*)stream_name - 1; + wimlib_assert(*p == ':'); + *p = '\0'; + dentry = get_dentry(w, path); if (!dentry || !dentry_is_regular_file(dentry)) return -ENOENT; - if (dentry_get_ads_entry(dentry, stream_name)) + if (inode_get_ads_entry(dentry->inode, stream_name, NULL)) return -EEXIST; - new_entry = dentry_add_ads(dentry, stream_name); + new_entry = inode_add_ads(dentry->inode, stream_name); if (!new_entry) return -ENOENT; } else { struct dentry *dentry, *parent; const char *basename; + /* Make a normal file (not an alternate data stream) */ + /* Make sure that the parent of @path exists and is a directory, and * that the dentry named by @path does not already exist. */ parent = get_parent_dentry(w, path); @@ -795,11 +1163,16 @@ static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev) return -ENOENT; if (!dentry_is_directory(parent)) return -ENOTDIR; + basename = path_basename(path); if (get_dentry_child_with_name(parent, path)) return -EEXIST; - dentry = new_dentry(basename); + dentry = new_dentry_with_inode(basename); + if (!dentry) + return -ENOMEM; + dentry->inode->resolved = true; + dentry->inode->ino = next_ino++; link_dentry(dentry, parent); } return 0; @@ -811,72 +1184,69 @@ static int wimfs_open(const char *path, struct fuse_file_info *fi) { struct dentry *dentry; struct lookup_table_entry *lte; - u8 *dentry_hash; int ret; struct wimlib_fd *fd; + struct inode *inode; + u16 stream_idx; + u32 stream_id; ret = lookup_resource(w, path, get_lookup_flags(), &dentry, <e, - &dentry_hash); + &stream_idx); if (ret != 0) return ret; - if (!lte) { - /* Empty file with no lookup-table entry. This is fine if it's - * a read-only filesystem. Otherwise we need to create a lookup - * table entry so that we can keep track of the file descriptors - * (this is important in case someone opens the file for - * writing) */ - if (!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) { - fi->fh = 0; - return 0; - } + inode = dentry->inode; - ret = extract_resource_to_staging_dir(dentry, <e, - lte->resource_entry.original_size); + if (stream_idx == 0) + stream_id = 0; + else + stream_id = inode->ads_entries[stream_idx - 1]->stream_id; + + /* The file resource may be in the staging directory (read-write mounts + * only) or in the WIM. If it's in the staging directory, we need to + * open a native file descriptor for the corresponding file. Otherwise, + * we can read the file resource directly from the WIM file if we are + * opening it read-only, but we need to extract the resource to the + * staging directory if we are opening it writable. */ + if (flags_writable(fi->flags) && + (!lte || lte->resource_location != RESOURCE_IN_STAGING_FILE)) { + u64 size = (lte) ? wim_resource_size(lte) : 0; + ret = extract_resource_to_staging_dir(inode, stream_id, + <e, size); if (ret != 0) return ret; } - ret = alloc_wimlib_fd(lte, &fd); + ret = alloc_wimlib_fd(inode, stream_id, lte, &fd); if (ret != 0) return ret; - fd->dentry = dentry; - - /* The file resource may be in the staging directory (read-write - * mounts only) or in the WIM. If it's in the staging - * directory, we need to open a native file descriptor for the - * corresponding file. Otherwise, we can read the file resource - * directly from the WIM file if we are opening it read-only, - * but we need to extract the resource to the staging directory - * if we are opening it writable. */ - if (flags_writable(fi->flags) && !lte->staging_file_name) { - ret = extract_resource_to_staging_dir(dentry, <e, - lte->resource_entry.original_size); - if (ret != 0) - return ret; - } - if (lte->staging_file_name) { + if (lte && lte->resource_location == RESOURCE_IN_STAGING_FILE) { fd->staging_fd = open(lte->staging_file_name, fi->flags); if (fd->staging_fd == -1) { close_wimlib_fd(fd); return -errno; } } - fi->fh = (uint64_t)fd; + fi->fh = (uintptr_t)fd; return 0; } /* Opens a directory. */ static int wimfs_opendir(const char *path, struct fuse_file_info *fi) { - struct dentry *dentry; + struct inode *inode; + int ret; + struct wimlib_fd *fd = NULL; - dentry = get_dentry(w, path); - if (!dentry || !dentry_is_directory(dentry)) + inode = wim_pathname_to_inode(w, path); + if (!inode) + return -ENOENT; + if (!inode_is_directory(inode)) return -ENOTDIR; - fi->fh = (uint64_t)dentry; - return 0; + ret = alloc_wimlib_fd(inode, 0, NULL, &fd); + fi->fh = (uintptr_t)fd; + return ret; } @@ -886,21 +1256,22 @@ static int wimfs_opendir(const char *path, struct fuse_file_info *fi) static int wimfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { - struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh; + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; - if (!fd) { - /* Empty file with no lookup table entry on read-only mounted - * WIM */ - wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)); + if (!fd) + return -EBADF; + + if (!fd->lte) /* Empty stream with no lookup table entry */ return 0; - } - if (fd->lte->staging_file_name) { + if (fd->lte->resource_location == RESOURCE_IN_STAGING_FILE) { /* Read from staging file */ + wimlib_assert(fd->lte->staging_file_name); wimlib_assert(fd->staging_fd != -1); ssize_t ret; + DEBUG("Seek to offset %zu", offset); if (lseek(fd->staging_fd, offset, SEEK_SET) == -1) return -errno; @@ -909,25 +1280,17 @@ static int wimfs_read(const char *path, char *buf, size_t size, return -errno; return ret; } else { - /* Read from WIM */ - struct resource_entry *res_entry; - int ctype; + u64 res_size = wim_resource_size(fd->lte); - res_entry = &fd->lte->resource_entry; - - ctype = wim_resource_compression_type(w, res_entry); - - if (offset > res_entry->original_size) + if (offset > res_size) return -EOVERFLOW; - size = min(size, res_entry->original_size - offset); + size = min(size, res_size - offset); - if (read_resource(w->fp, res_entry->size, - res_entry->original_size, - res_entry->offset, ctype, size, - offset, buf) != 0) + if (read_wim_resource(fd->lte, (u8*)buf, + size, offset, false) != 0) return -EIO; return size; } @@ -936,16 +1299,22 @@ static int wimfs_read(const char *path, char *buf, size_t size, /* 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) + off_t offset, struct fuse_file_info *fi) { - struct dentry *parent, *child; - - parent = (struct dentry*)fi->fh; - child = parent->children; + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + struct inode *inode; + struct dentry *child; + + if (!fd) + return -EBADF; + + inode = fd->inode; filler(buf, ".", NULL, 0); filler(buf, "..", NULL, 0); + child = inode->children; + if (!child) return 0; @@ -953,7 +1322,7 @@ static int wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, if (filler(buf, child->file_name_utf8, NULL, 0)) return 0; child = child->next; - } while (child != parent->children); + } while (child != inode->children); return 0; } @@ -967,7 +1336,7 @@ static int wimfs_readlink(const char *path, char *buf, size_t buf_len) if (!dentry_is_symlink(dentry)) return -EINVAL; - ret = dentry_readlink(dentry, buf, buf_len, w); + ret = inode_readlink(dentry->inode, buf, buf_len, w); if (ret > 0) ret = 0; return ret; @@ -976,24 +1345,56 @@ static int wimfs_readlink(const char *path, char *buf, size_t buf_len) /* Close a file. */ static int wimfs_release(const char *path, struct fuse_file_info *fi) { - int ret; - struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh; + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + wimlib_assert(fd); + return close_wimlib_fd(fd); +} - if (!fd) { - /* Empty file with no lookup table entry on read-only mounted - * WIM */ - wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)); - return 0; - } +static int wimfs_releasedir(const char *path, struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + wimlib_assert(fd); return close_wimlib_fd(fd); } +#ifdef ENABLE_XATTR +/* Remove an alternate data stream through the XATTR interface */ +static int wimfs_removexattr(const char *path, const char *name) +{ + struct dentry *dentry; + struct ads_entry *ads_entry; + u16 ads_idx; + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + dentry = get_dentry(w, path); + if (!dentry) + return -ENOENT; + + ads_entry = inode_get_ads_entry(dentry->inode, name, &ads_idx); + if (!ads_entry) + return -ENOATTR; + inode_remove_ads(dentry->inode, ads_idx, w->lookup_table); + return 0; +} +#endif + /* Renames a file or directory. See rename (3) */ static int wimfs_rename(const char *from, const char *to) { struct dentry *src; struct dentry *dst; struct dentry *parent_of_dst; + char *file_name_utf16 = NULL, *file_name_utf8 = NULL; + u16 file_name_utf16_len, file_name_utf8_len; + int ret; + + /* This rename() implementation currently only supports actual files + * (not alternate data streams) */ src = get_dentry(w, from); if (!src) @@ -1001,7 +1402,19 @@ static int wimfs_rename(const char *from, const char *to) dst = get_dentry(w, to); + + ret = get_names(&file_name_utf16, &file_name_utf8, + &file_name_utf16_len, &file_name_utf8_len, + path_basename(to)); + if (ret != 0) + return -ENOMEM; + if (dst) { + /* Destination file exists */ + + if (src == dst) /* Same file */ + return 0; + if (!dentry_is_directory(src)) { /* Cannot rename non-directory to directory. */ if (dentry_is_directory(dst)) @@ -1011,23 +1424,30 @@ static int wimfs_rename(const char *from, const char *to) * directory */ if (!dentry_is_directory(dst)) return -ENOTDIR; - if (dst->children != NULL) + if (dst->inode->children != NULL) return -ENOTEMPTY; } parent_of_dst = dst->parent; - unlink_dentry(dst); - lookup_table_decrement_refcnt(w->lookup_table, dst->hash); - free_dentry(dst); + remove_dentry(dst, w->lookup_table); } else { + /* Destination does not exist */ parent_of_dst = get_parent_dentry(w, to); if (!parent_of_dst) return -ENOENT; + + if (!dentry_is_directory(parent_of_dst)) + return -ENOTDIR; } + FREE(src->file_name); + FREE(src->file_name_utf8); + src->file_name = file_name_utf16; + src->file_name_utf8 = file_name_utf8; + src->file_name_len = file_name_utf16_len; + src->file_name_utf8_len = file_name_utf8_len; + unlink_dentry(src); - change_dentry_name(src, path_basename(to)); link_dentry(src, parent_of_dst); - /*calculate_dentry_full_path(src);*/ return 0; } @@ -1043,10 +1463,112 @@ static int wimfs_rmdir(const char *path) if (!dentry_is_empty_directory(dentry)) return -ENOTEMPTY; - unlink_dentry(dentry); - free_dentry(dentry); + remove_dentry(dentry, w->lookup_table); + 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 ads_entry *existing_ads_entry; + struct ads_entry *new_ads_entry; + struct lookup_table_entry *existing_lte; + struct lookup_table_entry *lte; + struct inode *inode; + u8 value_hash[SHA1_HASH_SIZE]; + u16 ads_idx; + + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + inode = wim_pathname_to_inode(w, path); + if (!inode) + return -ENOENT; + + existing_ads_entry = inode_get_ads_entry(inode, name, &ads_idx); + if (existing_ads_entry) { + if (flags & XATTR_CREATE) + return -EEXIST; + inode_remove_ads(inode, ads_idx, w->lookup_table); + } else { + if (flags & XATTR_REPLACE) + return -ENOATTR; + } + new_ads_entry = inode_add_ads(inode, name); + if (!new_ads_entry) + return -ENOMEM; + + sha1_buffer((const u8*)value, size, value_hash); + + existing_lte = __lookup_resource(w->lookup_table, value_hash); + + if (existing_lte) { + lte = existing_lte; + lte->refcnt++; + } else { + u8 *value_copy; + lte = new_lookup_table_entry(); + if (!lte) + return -ENOMEM; + value_copy = MALLOC(size); + if (!value_copy) { + FREE(lte); + return -ENOMEM; + } + memcpy(value_copy, value, size); + lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER; + lte->attached_buffer = value_copy; + lte->resource_entry.original_size = size; + lte->resource_entry.size = size; + lte->resource_entry.flags = 0; + copy_hash(lte->hash, value_hash); + lookup_table_insert(w->lookup_table, lte); + } + new_ads_entry->lte = lte; return 0; } +#endif + +static int wimfs_symlink(const char *to, const char *from) +{ + struct dentry *dentry_parent, *dentry; + const char *link_name; + struct inode *inode; + + dentry_parent = get_parent_dentry(w, from); + if (!dentry_parent) + return -ENOENT; + if (!dentry_is_directory(dentry_parent)) + return -ENOTDIR; + + link_name = path_basename(from); + + if (get_dentry_child_with_name(dentry_parent, link_name)) + return -EEXIST; + dentry = new_dentry_with_inode(link_name); + if (!dentry) + return -ENOMEM; + inode = dentry->inode; + + inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT; + inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK; + inode->ino = next_ino++; + + if (inode_set_symlink(inode, to, w->lookup_table, NULL) != 0) + goto out_free_dentry; + + link_dentry(dentry, dentry_parent); + return 0; +out_free_dentry: + free_dentry(dentry); + return -ENOMEM; +} /* Reduce the size of a file */ @@ -1055,10 +1577,12 @@ static int wimfs_truncate(const char *path, off_t size) struct dentry *dentry; struct lookup_table_entry *lte; int ret; - u8 *dentry_hash; + u16 stream_idx; + u32 stream_id; + struct inode *inode; ret = lookup_resource(w, path, get_lookup_flags(), &dentry, - <e, &dentry_hash); + <e, &stream_idx); if (ret != 0) return ret; @@ -1066,17 +1590,26 @@ static int wimfs_truncate(const char *path, off_t size) if (!lte) /* Already a zero-length file */ return 0; - if (lte->staging_file_name) { + inode = dentry->inode; + + if (stream_idx == 0) + stream_id = 0; + else + stream_id = inode->ads_entries[stream_idx - 1]->stream_id; + + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(lte->staging_file_name); ret = truncate(lte->staging_file_name, size); if (ret != 0) return -errno; lte->resource_entry.original_size = size; } else { + wimlib_assert(lte->resource_location == RESOURCE_IN_WIM); /* File in WIM. Extract it to the staging directory, but only * the first @size bytes of it. */ - ret = extract_resource_to_staging_dir(dentry, <e, size); + ret = extract_resource_to_staging_dir(inode, stream_id, + <e, size); } - dentry_update_all_timestamps(dentry); return ret; } @@ -1085,65 +1618,68 @@ static int wimfs_unlink(const char *path) { struct dentry *dentry; struct lookup_table_entry *lte; + struct inode *inode; int ret; - u8 *dentry_hash; + u16 stream_idx; + unsigned i; ret = lookup_resource(w, path, get_lookup_flags(), &dentry, - <e, &dentry_hash); + <e, &stream_idx); if (ret != 0) return ret; - if (lte && lte->staging_file_name) - if (unlink(lte->staging_file_name) != 0) - return -errno; - - if (dentry_hash == dentry->hash) { - /* We are removing the full dentry including all alternate data - * streams. */ - const u8 *hash = dentry->hash; - u16 i = 0; - while (1) { - lookup_table_decrement_refcnt(w->lookup_table, hash); - if (i == dentry->num_ads) - break; - hash = dentry->ads_entries[i].hash; - i++; - } - - unlink_dentry(dentry); - free_dentry(dentry); - } else { - /* We are removing an alternate data stream. */ - struct ads_entry *cur_entry = dentry->ads_entries; - while (cur_entry->hash != dentry_hash) - cur_entry++; - lookup_table_decrement_refcnt(w->lookup_table, cur_entry->hash); - - dentry_remove_ads(dentry, cur_entry); - } - /* Beware: The lookup table entry(s) may still be referenced by users - * that have opened the corresponding streams. They are freed later in - * wimfs_release() when the last file user has closed the stream. */ + if (stream_idx == 0) + remove_dentry(dentry, w->lookup_table); + else + inode_remove_ads(dentry->inode, stream_idx - 1, w->lookup_table); return 0; } -/* Change the timestamp on a file dentry. +#ifdef HAVE_UTIMENSAT +/* + * Change the timestamp on a file dentry. * - * There is no distinction between a file and its alternate data streams here. */ + * Note that alternate data streams do not have their own timestamps. + */ static int wimfs_utimens(const char *path, const struct timespec tv[2]) { - struct dentry *dentry = get_dentry(w, path); + struct dentry *dentry; + struct inode *inode; + dentry = get_dentry(w, path); + if (!dentry) + return -ENOENT; + inode = dentry->inode; + + if (tv[0].tv_nsec != UTIME_OMIT) { + if (tv[0].tv_nsec == UTIME_NOW) + inode->last_access_time = get_wim_timestamp(); + else + inode->last_access_time = timespec_to_wim_timestamp(&tv[0]); + } + if (tv[1].tv_nsec != UTIME_OMIT) { + if (tv[1].tv_nsec == UTIME_NOW) + inode->last_write_time = get_wim_timestamp(); + else + inode->last_write_time = timespec_to_wim_timestamp(&tv[1]); + } + return 0; +} +#else +static int wimfs_utime(const char *path, struct utimbuf *times) +{ + struct dentry *dentry; + struct inode *inode; + dentry = get_dentry(w, path); if (!dentry) return -ENOENT; - time_t last_access_t = (tv[0].tv_nsec == UTIME_NOW) ? - time(NULL) : tv[0].tv_sec; - dentry->last_access_time = unix_timestamp_to_ms(last_access_t); - time_t last_mod_t = (tv[1].tv_nsec == UTIME_NOW) ? - time(NULL) : tv[1].tv_sec; - dentry->last_write_time = unix_timestamp_to_ms(last_mod_t); + inode = dentry->inode; + + inode->last_write_time = unix_timestamp_to_wim(times->modtime); + inode->last_access_time = unix_timestamp_to_wim(times->actime); return 0; } +#endif /* Writes to a file in the WIM filesystem. * It may be an alternate data stream, but here we don't even notice because we @@ -1151,104 +1687,195 @@ static int wimfs_utimens(const char *path, const struct timespec tv[2]) static int wimfs_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { - struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh; + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; int ret; + u64 now; + + if (!fd) + return -EBADF; wimlib_assert(fd->lte); wimlib_assert(fd->lte->staging_file_name); wimlib_assert(fd->staging_fd != -1); + wimlib_assert(fd->inode); + + /* Seek to the requested position */ + if (lseek(fd->staging_fd, offset, SEEK_SET) == -1) + return -errno; /* Write the data. */ ret = write(fd->staging_fd, buf, size); if (ret == -1) return -errno; - /* The file has been modified, so all its timestamps must be - * updated. */ - dentry_update_all_timestamps(fd->dentry); - + now = get_wim_timestamp(); + fd->inode->last_write_time = now; + fd->inode->last_access_time = now; return ret; } - -static struct fuse_operations wimfs_oper = { - .access = wimfs_access, - .destroy = wimfs_destroy, - .ftruncate = wimfs_ftruncate, - .getattr = wimfs_getattr, - .mkdir = wimfs_mkdir, - .mknod = wimfs_mknod, - .open = wimfs_open, - .opendir = wimfs_opendir, - .read = wimfs_read, - .readdir = wimfs_readdir, - .readlink = wimfs_readlink, - .release = wimfs_release, - .rename = wimfs_rename, - .rmdir = wimfs_rmdir, - .truncate = wimfs_truncate, - .unlink = wimfs_unlink, - .utimens = wimfs_utimens, - .write = wimfs_write, +static struct fuse_operations wimfs_operations = { + .access = wimfs_access, + .destroy = wimfs_destroy, +#if 0 + .fallocate = wimfs_fallocate, + .fgetattr = wimfs_fgetattr, +#endif + .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, + .opendir = wimfs_opendir, + .read = wimfs_read, + .readdir = wimfs_readdir, + .readlink = wimfs_readlink, + .release = wimfs_release, + .releasedir = wimfs_releasedir, +#ifdef ENABLE_XATTR + .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, +#ifdef HAVE_UTIMENSAT + .utimens = wimfs_utimens, +#else + .utime = wimfs_utime, +#endif + .write = wimfs_write, }; /* Mounts a WIM file. */ WIMLIBAPI int wimlib_mount(WIMStruct *wim, int image, const char *dir, - int flags) + int flags, WIMStruct **additional_swms, + unsigned num_additional_swms) { int argc = 0; - char *argv[6]; + char *argv[16]; int ret; char *p; + struct lookup_table *joined_tab, *wim_tab_save; + struct image_metadata *imd; DEBUG("Mount: wim = %p, image = %d, dir = %s, flags = %d, ", wim, image, dir, flags); - if (!dir) + if (!wim || !dir) return WIMLIB_ERR_INVALID_PARAM; + ret = verify_swm_set(wim, additional_swms, num_additional_swms); + if (ret != 0) + return ret; + + if (num_additional_swms) { + ret = new_joined_lookup_table(wim, additional_swms, + num_additional_swms, + &joined_tab); + if (ret != 0) + return ret; + wim_tab_save = wim->lookup_table; + wim->lookup_table = joined_tab; + } + ret = wimlib_select_image(wim, image); if (ret != 0) - return ret; + goto out; + + imd = &wim->image_metadata[image - 1]; + + DEBUG("Selected image %d", image); + + next_ino = assign_inode_numbers(&imd->inode_list); + + DEBUG("(next_ino = %"PRIu64")", next_ino); + + /* Resolve all the lookup table entries of the dentry tree */ + DEBUG("Resolving lookup table entries"); + for_dentry_in_tree(imd->root_dentry, dentry_resolve_ltes, + wim->lookup_table); if (flags & WIMLIB_MOUNT_FLAG_READWRITE) - wim_get_current_image_metadata(wim)->modified = true; + imd->modified = true; if (!(flags & (WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE | WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR | WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS))) flags |= WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR; + DEBUG("Getting current directory"); + mount_dir = dir; working_directory = getcwd(NULL, 0); if (!working_directory) { ERROR_WITH_ERRNO("Could not determine current directory"); - return WIMLIB_ERR_NOTDIR; + ret = WIMLIB_ERR_NOTDIR; + goto out; } + DEBUG("Closing POSIX message queues"); + /* XXX hack to get rid of the message queues if they already exist for + * some reason (maybe left over from a previous mount that wasn't + * unmounted correctly) */ + ret = open_message_queues(true); + if (ret != 0) + goto out; + close_message_queues(); + + DEBUG("Preparing arguments to fuse_main()"); + + p = STRDUP(dir); - if (!p) - return WIMLIB_ERR_NOMEM; + if (!p) { + ret = WIMLIB_ERR_NOMEM; + goto out; + } - argv[argc++] = "mount"; + argv[argc++] = "imagex"; argv[argc++] = p; argv[argc++] = "-s"; /* disable multi-threaded operation */ - if (flags & WIMLIB_MOUNT_FLAG_DEBUG) { + if (flags & WIMLIB_MOUNT_FLAG_DEBUG) argv[argc++] = "-d"; - } - if (!(flags & WIMLIB_MOUNT_FLAG_READWRITE)) { - argv[argc++] = "-o"; - argv[argc++] = "ro"; - } else { + + /* + * We provide the use_ino option because we are going to assign inode + * numbers oursides. We've already numbered the hard link groups with + * unique numbers with the assign_link_groups() function, and the static + * variable next_link_group_id is set to the next available link group + * ID that we will assign to new dentries. + */ + char optstring[256] = "use_ino"; + argv[argc++] = "-o"; + argv[argc++] = optstring; + if ((flags & WIMLIB_MOUNT_FLAG_READWRITE)) { + /* Read-write mount. Make the staging directory */ make_staging_dir(); if (!staging_dir_name) { FREE(p); - return WIMLIB_ERR_MKDIR; + ret = WIMLIB_ERR_MKDIR; + goto out; } + } else { + /* Read-only mount */ + strcat(optstring, ",ro"); } + strcat(optstring, ",subtype=wimfs,attr_timeout=0"); + argv[argc] = NULL; #ifdef ENABLE_DEBUG { @@ -1267,9 +1894,15 @@ WIMLIBAPI int wimlib_mount(WIMStruct *wim, int image, const char *dir, w = wim; mount_flags = flags; - ret = fuse_main(argc, argv, &wimfs_oper, NULL); - - return (ret == 0) ? 0 : WIMLIB_ERR_FUSE; + ret = fuse_main(argc, argv, &wimfs_operations, NULL); + if (ret) + ret = WIMLIB_ERR_FUSE; +out: + if (num_additional_swms) { + free_lookup_table(wim->lookup_table); + wim->lookup_table = wim_tab_save; + } + return ret; } @@ -1288,6 +1921,30 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) int msgsize; int errno_save; + mount_dir = dir; + + /* Open message queues between the unmount process and the + * filesystem daemon. */ + ret = open_message_queues(false); + if (ret != 0) + return ret; + + /* Send a message to the filesystem saying whether to commit or + * not. */ + msg[0] = (flags & WIMLIB_UNMOUNT_FLAG_COMMIT) ? 1 : 0; + msg[1] = (flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY) ? 1 : 0; + + DEBUG("Sending message: %s, %s", + (msg[0] == 0) ? "don't commit" : "commit", + (msg[1] == 0) ? "don't check" : "check"); + ret = mq_send(unmount_to_daemon_mq, msg, 2, 1); + if (ret == -1) { + ERROR("Failed to notify filesystem daemon whether we want to " + "commit changes or not"); + close_message_queues(); + return WIMLIB_ERR_MQUEUE; + } + /* Execute `fusermount -u', which is installed setuid root, to unmount * the WIM. * @@ -1300,7 +1957,7 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) * the WIM file. */ - mount_dir = dir; + pid = fork(); if (pid == -1) { ERROR_WITH_ERRNO("Failed to fork()"); @@ -1309,10 +1966,10 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) if (pid == 0) { execlp("fusermount", "fusermount", "-u", dir, NULL); ERROR_WITH_ERRNO("Failed to execute `fusermount'"); - return WIMLIB_ERR_FUSERMOUNT; + exit(WIMLIB_ERR_FUSERMOUNT); } - ret = waitpid(pid, &status, 0); + ret = wait(&status); if (ret == -1) { ERROR_WITH_ERRNO("Failed to wait for fusermount process to " "terminate"); @@ -1321,31 +1978,35 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) if (status != 0) { ERROR("fusermount exited with status %d", status); - return WIMLIB_ERR_FUSERMOUNT; - } - /* Open message queues between the unmount process and the - * filesystem daemon. */ - ret = open_message_queues(false); - if (ret != 0) - return ret; + /* 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. */ - /* Send a message to the filesystem saying whether to commit or - * not. */ - msg[0] = (flags & WIMLIB_UNMOUNT_FLAG_COMMIT) ? 1 : 0; - msg[1] = (flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY) ? 1 : 0; + pid = fork(); + if (pid == -1) { + ERROR_WITH_ERRNO("Failed to fork()"); + return WIMLIB_ERR_FORK; + } + if (pid == 0) { + execlp("umount", "umount", dir, NULL); + ERROR_WITH_ERRNO("Failed to execute `umount'"); + exit(WIMLIB_ERR_FUSERMOUNT); + } - DEBUG("Sending message: %s, %s", - (msg[0] == 0) ? "don't commit" : "commit", - (msg[1] == 0) ? "don't check" : "check"); - ret = mq_send(unmount_to_daemon_mq, msg, 2, 1); - if (ret == -1) { - ERROR("Failed to notify filesystem daemon whether we want to " - "commit changes or not"); - close_message_queues(); - return WIMLIB_ERR_MQUEUE; + ret = wait(&status); + if (ret == -1) { + ERROR_WITH_ERRNO("Failed to wait for `umount' process to " + "terminate"); + return WIMLIB_ERR_FUSERMOUNT; + } + if (status != 0) { + ERROR("`umount' exited with failure status"); + return WIMLIB_ERR_FUSERMOUNT; + } } + /* Wait for a message from the filesytem daemon indicating whether the * filesystem was unmounted successfully (0) or an error occurred (1). * This may take a long time if a big WIM file needs to be rewritten. */ @@ -1355,7 +2016,10 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) * filesystem daemon has crashed or failed for some reason. * * XXX come up with some method to determine if the filesystem - * daemon has really crashed or not. */ + * daemon has really crashed or not. + * + * XXX Idea: have mount daemon write its PID into the WIM file header? + * */ gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + 600; @@ -1406,7 +2070,8 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) } WIMLIBAPI int wimlib_mount(WIMStruct *wim_p, int image, const char *dir, - int flags) + int flags, WIMStruct **additional_swms, + unsigned num_additional_swms) { return mount_unsupported_error(); }