/** * logfile.c - NTFS journal handling. Originated from the Linux-NTFS project. * * Copyright (c) 2002-2005 Anton Altaparmakov * Copyright (c) 2005 Yura Pakhuchiy * Copyright (c) 2005-2009 Szabolcs Szakacsits * * This program/include file is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program/include file is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (in the main directory of the NTFS-3G * distribution in the file COPYING); if not, write to the Free Software * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef HAVE_STDLIB_H #include <stdlib.h> #endif #ifdef HAVE_STRING_H #include <string.h> #endif #ifdef HAVE_ERRNO_H #include <errno.h> #endif #include "attrib.h" #include "debug.h" #include "logfile.h" #include "volume.h" #include "mst.h" #include "logging.h" #include "misc.h" /** * ntfs_check_restart_page_header - check the page header for consistency * @rp: restart page header to check * @pos: position in logfile at which the restart page header resides * * Check the restart page header @rp for consistency and return TRUE if it is * consistent and FALSE otherwise. * * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not * require the full restart page. */ static BOOL ntfs_check_restart_page_header(RESTART_PAGE_HEADER *rp, s64 pos) { u32 logfile_system_page_size, logfile_log_page_size; u16 ra_ofs, usa_count, usa_ofs, usa_end = 0; BOOL have_usa = TRUE; ntfs_log_trace("Entering.\n"); /* * If the system or log page sizes are smaller than the ntfs block size * or either is not a power of 2 we cannot handle this log file. */ logfile_system_page_size = le32_to_cpu(rp->system_page_size); logfile_log_page_size = le32_to_cpu(rp->log_page_size); if (logfile_system_page_size < NTFS_BLOCK_SIZE || logfile_log_page_size < NTFS_BLOCK_SIZE || logfile_system_page_size & (logfile_system_page_size - 1) || logfile_log_page_size & (logfile_log_page_size - 1)) { ntfs_log_error("$LogFile uses unsupported page size.\n"); return FALSE; } /* * We must be either at !pos (1st restart page) or at pos = system page * size (2nd restart page). */ if (pos && pos != logfile_system_page_size) { ntfs_log_error("Found restart area in incorrect " "position in $LogFile.\n"); return FALSE; } /* * We only know how to handle version 1.1 and 2.0, though * version 2.0 is probably related to cached metadata in * Windows 8, and we will refuse to mount. * Nevertheless, do all the relevant checks before rejecting. */ if (((rp->major_ver != const_cpu_to_sle16(1)) || (rp->minor_ver != const_cpu_to_sle16(1))) && ((rp->major_ver != const_cpu_to_sle16(2)) || (rp->minor_ver != const_cpu_to_sle16(0)))) { ntfs_log_error("$LogFile version %i.%i is not " "supported.\n (This driver supports version " "1.1 and 2.0 only.)\n", (int)sle16_to_cpu(rp->major_ver), (int)sle16_to_cpu(rp->minor_ver)); return FALSE; } /* * If chkdsk has been run the restart page may not be protected by an * update sequence array. */ if (ntfs_is_chkd_record(rp->magic) && !le16_to_cpu(rp->usa_count)) { have_usa = FALSE; goto skip_usa_checks; } /* Verify the size of the update sequence array. */ usa_count = 1 + (logfile_system_page_size >> NTFS_BLOCK_SIZE_BITS); if (usa_count != le16_to_cpu(rp->usa_count)) { ntfs_log_error("$LogFile restart page specifies " "inconsistent update sequence array count.\n"); return FALSE; } /* Verify the position of the update sequence array. */ usa_ofs = le16_to_cpu(rp->usa_ofs); usa_end = usa_ofs + usa_count * sizeof(u16); if (usa_ofs < offsetof(RESTART_PAGE_HEADER, usn) || usa_end > NTFS_BLOCK_SIZE - sizeof(u16)) { ntfs_log_error("$LogFile restart page specifies " "inconsistent update sequence array offset.\n"); return FALSE; } skip_usa_checks: /* * Verify the position of the restart area. It must be: * - aligned to 8-byte boundary, * - after the update sequence array, and * - within the system page size. */ ra_ofs = le16_to_cpu(rp->restart_area_offset); if (ra_ofs & 7 || (have_usa ? ra_ofs < usa_end : ra_ofs < offsetof(RESTART_PAGE_HEADER, usn)) || ra_ofs > logfile_system_page_size) { ntfs_log_error("$LogFile restart page specifies " "inconsistent restart area offset.\n"); return FALSE; } /* * Only restart pages modified by chkdsk are allowed to have chkdsk_lsn * set. */ if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) { ntfs_log_error("$LogFile restart page is not modified " "by chkdsk but a chkdsk LSN is specified.\n"); return FALSE; } ntfs_log_trace("Done.\n"); return TRUE; } /** * ntfs_check_restart_area - check the restart area for consistency * @rp: restart page whose restart area to check * * Check the restart area of the restart page @rp for consistency and return * TRUE if it is consistent and FALSE otherwise. * * This function assumes that the restart page header has already been * consistency checked. * * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not * require the full restart page. */ static BOOL ntfs_check_restart_area(RESTART_PAGE_HEADER *rp) { u64 file_size; RESTART_AREA *ra; u16 ra_ofs, ra_len, ca_ofs; u8 fs_bits; ntfs_log_trace("Entering.\n"); ra_ofs = le16_to_cpu(rp->restart_area_offset); ra = (RESTART_AREA*)((u8*)rp + ra_ofs); /* * Everything before ra->file_size must be before the first word * protected by an update sequence number. This ensures that it is * safe to access ra->client_array_offset. */ if (ra_ofs + offsetof(RESTART_AREA, file_size) > NTFS_BLOCK_SIZE - sizeof(u16)) { ntfs_log_error("$LogFile restart area specifies " "inconsistent file offset.\n"); return FALSE; } /* * Now that we can access ra->client_array_offset, make sure everything * up to the log client array is before the first word protected by an * update sequence number. This ensures we can access all of the * restart area elements safely. Also, the client array offset must be * aligned to an 8-byte boundary. */ ca_ofs = le16_to_cpu(ra->client_array_offset); if (((ca_ofs + 7) & ~7) != ca_ofs || ra_ofs + ca_ofs > (u16)(NTFS_BLOCK_SIZE - sizeof(u16))) { ntfs_log_error("$LogFile restart area specifies " "inconsistent client array offset.\n"); return FALSE; } /* * The restart area must end within the system page size both when * calculated manually and as specified by ra->restart_area_length. * Also, the calculated length must not exceed the specified length. */ ra_len = ca_ofs + le16_to_cpu(ra->log_clients) * sizeof(LOG_CLIENT_RECORD); if ((u32)(ra_ofs + ra_len) > le32_to_cpu(rp->system_page_size) || (u32)(ra_ofs + le16_to_cpu(ra->restart_area_length)) > le32_to_cpu(rp->system_page_size) || ra_len > le16_to_cpu(ra->restart_area_length)) { ntfs_log_error("$LogFile restart area is out of bounds " "of the system page size specified by the " "restart page header and/or the specified " "restart area length is inconsistent.\n"); return FALSE; } /* * The ra->client_free_list and ra->client_in_use_list must be either * LOGFILE_NO_CLIENT or less than ra->log_clients or they are * overflowing the client array. */ if ((ra->client_free_list != LOGFILE_NO_CLIENT && le16_to_cpu(ra->client_free_list) >= le16_to_cpu(ra->log_clients)) || (ra->client_in_use_list != LOGFILE_NO_CLIENT && le16_to_cpu(ra->client_in_use_list) >= le16_to_cpu(ra->log_clients))) { ntfs_log_error("$LogFile restart area specifies " "overflowing client free and/or in use lists.\n"); return FALSE; } /* * Check ra->seq_number_bits against ra->file_size for consistency. * We cannot just use ffs() because the file size is not a power of 2. */ file_size = (u64)sle64_to_cpu(ra->file_size); fs_bits = 0; while (file_size) { file_size >>= 1; fs_bits++; } if (le32_to_cpu(ra->seq_number_bits) != (u32)(67 - fs_bits)) { ntfs_log_error("$LogFile restart area specifies " "inconsistent sequence number bits.\n"); return FALSE; } /* The log record header length must be a multiple of 8. */ if (((le16_to_cpu(ra->log_record_header_length) + 7) & ~7) != le16_to_cpu(ra->log_record_header_length)) { ntfs_log_error("$LogFile restart area specifies " "inconsistent log record header length.\n"); return FALSE; } /* Ditto for the log page data offset. */ if (((le16_to_cpu(ra->log_page_data_offset) + 7) & ~7) != le16_to_cpu(ra->log_page_data_offset)) { ntfs_log_error("$LogFile restart area specifies " "inconsistent log page data offset.\n"); return FALSE; } ntfs_log_trace("Done.\n"); return TRUE; } /** * ntfs_check_log_client_array - check the log client array for consistency * @rp: restart page whose log client array to check * * Check the log client array of the restart page @rp for consistency and * return TRUE if it is consistent and FALSE otherwise. * * This function assumes that the restart page header and the restart area have * already been consistency checked. * * Unlike ntfs_check_restart_page_header() and ntfs_check_restart_area(), this * function needs @rp->system_page_size bytes in @rp, i.e. it requires the full * restart page and the page must be multi sector transfer deprotected. */ static BOOL ntfs_check_log_client_array(RESTART_PAGE_HEADER *rp) { RESTART_AREA *ra; LOG_CLIENT_RECORD *ca, *cr; u16 nr_clients, idx; BOOL in_free_list, idx_is_first; u32 offset_clients; ntfs_log_trace("Entering.\n"); /* The restart area must be fully within page */ if ((le16_to_cpu(rp->restart_area_offset) + sizeof(RESTART_AREA)) > le32_to_cpu(rp->system_page_size)) goto err_out; ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); offset_clients = le16_to_cpu(rp->restart_area_offset) + le16_to_cpu(ra->client_array_offset); /* The clients' records must begin within page */ if (offset_clients >= le32_to_cpu(rp->system_page_size)) goto err_out; ca = (LOG_CLIENT_RECORD*)((u8*)ra + le16_to_cpu(ra->client_array_offset)); /* * Check the ra->client_free_list first and then check the * ra->client_in_use_list. Check each of the log client records in * each of the lists and check that the array does not overflow the * ra->log_clients value. Also keep track of the number of records * visited as there cannot be more than ra->log_clients records and * that way we detect eventual loops in within a list. */ nr_clients = le16_to_cpu(ra->log_clients); idx = le16_to_cpu(ra->client_free_list); in_free_list = TRUE; check_list: for (idx_is_first = TRUE; idx != LOGFILE_NO_CLIENT_CPU; nr_clients--, idx = le16_to_cpu(cr->next_client)) { if (!nr_clients || idx >= le16_to_cpu(ra->log_clients)) goto err_out; /* The client record must be fully within page */ if ((offset_clients + (idx + 1)*sizeof(LOG_CLIENT_RECORD)) > le32_to_cpu(rp->system_page_size)) goto err_out; /* Set @cr to the current log client record. */ cr = ca + idx; /* The first log client record must not have a prev_client. */ if (idx_is_first) { if (cr->prev_client != LOGFILE_NO_CLIENT) goto err_out; idx_is_first = FALSE; } } /* Switch to and check the in use list if we just did the free list. */ if (in_free_list) { in_free_list = FALSE; idx = le16_to_cpu(ra->client_in_use_list); goto check_list; } ntfs_log_trace("Done.\n"); return TRUE; err_out: ntfs_log_error("$LogFile log client array is corrupt.\n"); return FALSE; } /** * ntfs_check_and_load_restart_page - check the restart page for consistency * @log_na: opened ntfs attribute for journal $LogFile * @rp: restart page to check * @pos: position in @log_na at which the restart page resides * @wrp: [OUT] copy of the multi sector transfer deprotected restart page * @lsn: [OUT] set to the current logfile lsn on success * * Check the restart page @rp for consistency and return 0 if it is consistent * and errno otherwise. The restart page may have been modified by chkdsk in * which case its magic is CHKD instead of RSTR. * * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not * require the full restart page. * * If @wrp is not NULL, on success, *@wrp will point to a buffer containing a * copy of the complete multi sector transfer deprotected page. On failure, * *@wrp is undefined. * * Similarly, if @lsn is not NULL, on success *@lsn will be set to the current * logfile lsn according to this restart page. On failure, *@lsn is undefined. * * The following error codes are defined: * EINVAL - The restart page is inconsistent. * ENOMEM - Not enough memory to load the restart page. * EIO - Failed to reading from $LogFile. */ static int ntfs_check_and_load_restart_page(ntfs_attr *log_na, RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp, LSN *lsn) { RESTART_AREA *ra; RESTART_PAGE_HEADER *trp; int err; ntfs_log_trace("Entering.\n"); /* Check the restart page header for consistency. */ if (!ntfs_check_restart_page_header(rp, pos)) { /* Error output already done inside the function. */ return EINVAL; } /* Check the restart area for consistency. */ if (!ntfs_check_restart_area(rp)) { /* Error output already done inside the function. */ return EINVAL; } ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); /* * Allocate a buffer to store the whole restart page so we can multi * sector transfer deprotect it. * For safety, make sure this is consistent with the usa_count * and shorter than the full log size */ if ((le32_to_cpu(rp->system_page_size) > (u32)(le16_to_cpu(rp->usa_count) - 1)*NTFS_BLOCK_SIZE) || (le32_to_cpu(rp->system_page_size) > le64_to_cpu(log_na->data_size))) return (EINVAL); trp = ntfs_malloc(le32_to_cpu(rp->system_page_size)); if (!trp) return errno; /* * Read the whole of the restart page into the buffer. If it fits * completely inside @rp, just copy it from there. Otherwise read it * from disk. */ if (le32_to_cpu(rp->system_page_size) <= NTFS_BLOCK_SIZE) memcpy(trp, rp, le32_to_cpu(rp->system_page_size)); else if (ntfs_attr_pread(log_na, pos, le32_to_cpu(rp->system_page_size), trp) != le32_to_cpu(rp->system_page_size)) { err = errno; ntfs_log_error("Failed to read whole restart page into the " "buffer.\n"); if (err != ENOMEM) err = EIO; goto err_out; } /* * Perform the multi sector transfer deprotection on the buffer if the * restart page is protected. */ if ((!ntfs_is_chkd_record(trp->magic) || le16_to_cpu(trp->usa_count)) && ntfs_mst_post_read_fixup((NTFS_RECORD*)trp, le32_to_cpu(rp->system_page_size))) { /* * A multi sector tranfer error was detected. We only need to * abort if the restart page contents exceed the multi sector * transfer fixup of the first sector. */ if (le16_to_cpu(rp->restart_area_offset) + le16_to_cpu(ra->restart_area_length) > NTFS_BLOCK_SIZE - (int)sizeof(u16)) { ntfs_log_error("Multi sector transfer error " "detected in $LogFile restart page.\n"); err = EINVAL; goto err_out; } } /* * If the restart page is modified by chkdsk or there are no active * logfile clients, the logfile is consistent. Otherwise, need to * check the log client records for consistency, too. */ err = 0; if (ntfs_is_rstr_record(rp->magic) && ra->client_in_use_list != LOGFILE_NO_CLIENT) { if (!ntfs_check_log_client_array(trp)) { err = EINVAL; goto err_out; } } if (lsn) { if (ntfs_is_rstr_record(rp->magic)) *lsn = sle64_to_cpu(ra->current_lsn); else /* if (ntfs_is_chkd_record(rp->magic)) */ *lsn = sle64_to_cpu(rp->chkdsk_lsn); } ntfs_log_trace("Done.\n"); if (wrp) *wrp = trp; else { err_out: free(trp); } return err; } /** * ntfs_check_logfile - check in the journal if the volume is consistent * @log_na: ntfs attribute of loaded journal $LogFile to check * @rp: [OUT] on success this is a copy of the current restart page * * Check the $LogFile journal for consistency and return TRUE if it is * consistent and FALSE if not. On success, the current restart page is * returned in *@rp. Caller must call ntfs_free(*@rp) when finished with it. * * At present we only check the two restart pages and ignore the log record * pages. * * Note that the MstProtected flag is not set on the $LogFile inode and hence * when reading pages they are not deprotected. This is because we do not know * if the $LogFile was created on a system with a different page size to ours * yet and mst deprotection would fail if our page size is smaller. */ BOOL ntfs_check_logfile(ntfs_attr *log_na, RESTART_PAGE_HEADER **rp) { s64 size, pos; LSN rstr1_lsn, rstr2_lsn; ntfs_volume *vol = log_na->ni->vol; u8 *kaddr = NULL; RESTART_PAGE_HEADER *rstr1_ph = NULL; RESTART_PAGE_HEADER *rstr2_ph = NULL; int log_page_size, err; BOOL logfile_is_empty = TRUE; u8 log_page_bits; ntfs_log_trace("Entering.\n"); /* An empty $LogFile must have been clean before it got emptied. */ if (NVolLogFileEmpty(vol)) goto is_empty; size = log_na->data_size; /* Make sure the file doesn't exceed the maximum allowed size. */ if (size > (s64)MaxLogFileSize) size = MaxLogFileSize; log_page_size = DefaultLogPageSize; /* * Use generic_ffs() instead of ffs() to enable the compiler to * optimize log_page_size and log_page_bits into constants. */ log_page_bits = ffs(log_page_size) - 1; size &= ~(log_page_size - 1); /* * Ensure the log file is big enough to store at least the two restart * pages and the minimum number of log record pages. */ if (size < log_page_size * 2 || (size - log_page_size * 2) >> log_page_bits < MinLogRecordPages) { ntfs_log_error("$LogFile is too small.\n"); return FALSE; } /* Allocate memory for restart page. */ kaddr = ntfs_malloc(NTFS_BLOCK_SIZE); if (!kaddr) return FALSE; /* * Read through the file looking for a restart page. Since the restart * page header is at the beginning of a page we only need to search at * what could be the beginning of a page (for each page size) rather * than scanning the whole file byte by byte. If all potential places * contain empty and uninitialized records, the log file can be assumed * to be empty. */ for (pos = 0; pos < size; pos <<= 1) { /* * Read first NTFS_BLOCK_SIZE bytes of potential restart page. */ if (ntfs_attr_pread(log_na, pos, NTFS_BLOCK_SIZE, kaddr) != NTFS_BLOCK_SIZE) { ntfs_log_error("Failed to read first NTFS_BLOCK_SIZE " "bytes of potential restart page.\n"); goto err_out; } /* * A non-empty block means the logfile is not empty while an * empty block after a non-empty block has been encountered * means we are done. */ if (!ntfs_is_empty_recordp((le32*)kaddr)) logfile_is_empty = FALSE; else if (!logfile_is_empty) break; /* * A log record page means there cannot be a restart page after * this so no need to continue searching. */ if (ntfs_is_rcrd_recordp((le32*)kaddr)) break; /* If not a (modified by chkdsk) restart page, continue. */ if (!ntfs_is_rstr_recordp((le32*)kaddr) && !ntfs_is_chkd_recordp((le32*)kaddr)) { if (!pos) pos = NTFS_BLOCK_SIZE >> 1; continue; } /* * Check the (modified by chkdsk) restart page for consistency * and get a copy of the complete multi sector transfer * deprotected restart page. */ err = ntfs_check_and_load_restart_page(log_na, (RESTART_PAGE_HEADER*)kaddr, pos, !rstr1_ph ? &rstr1_ph : &rstr2_ph, !rstr1_ph ? &rstr1_lsn : &rstr2_lsn); if (!err) { /* * If we have now found the first (modified by chkdsk) * restart page, continue looking for the second one. */ if (!pos) { pos = NTFS_BLOCK_SIZE >> 1; continue; } /* * We have now found the second (modified by chkdsk) * restart page, so we can stop looking. */ break; } /* * Error output already done inside the function. Note, we do * not abort if the restart page was invalid as we might still * find a valid one further in the file. */ if (err != EINVAL) goto err_out; /* Continue looking. */ if (!pos) pos = NTFS_BLOCK_SIZE >> 1; } if (kaddr) { free(kaddr); kaddr = NULL; } if (logfile_is_empty) { NVolSetLogFileEmpty(vol); is_empty: ntfs_log_trace("Done. ($LogFile is empty.)\n"); return TRUE; } if (!rstr1_ph) { if (rstr2_ph) ntfs_log_error("BUG: rstr2_ph isn't NULL!\n"); ntfs_log_error("Did not find any restart pages in " "$LogFile and it was not empty.\n"); return FALSE; } /* If both restart pages were found, use the more recent one. */ if (rstr2_ph) { /* * If the second restart area is more recent, switch to it. * Otherwise just throw it away. */ if (rstr2_lsn > rstr1_lsn) { ntfs_log_debug("Using second restart page as it is more " "recent.\n"); free(rstr1_ph); rstr1_ph = rstr2_ph; /* rstr1_lsn = rstr2_lsn; */ } else { ntfs_log_debug("Using first restart page as it is more " "recent.\n"); free(rstr2_ph); } rstr2_ph = NULL; } /* All consistency checks passed. */ if (rp) *rp = rstr1_ph; else free(rstr1_ph); ntfs_log_trace("Done.\n"); return TRUE; err_out: free(kaddr); free(rstr1_ph); free(rstr2_ph); return FALSE; } /** * ntfs_is_logfile_clean - check in the journal if the volume is clean * @log_na: ntfs attribute of loaded journal $LogFile to check * @rp: copy of the current restart page * * Analyze the $LogFile journal and return TRUE if it indicates the volume was * shutdown cleanly and FALSE if not. * * At present we only look at the two restart pages and ignore the log record * pages. This is a little bit crude in that there will be a very small number * of cases where we think that a volume is dirty when in fact it is clean. * This should only affect volumes that have not been shutdown cleanly but did * not have any pending, non-check-pointed i/o, i.e. they were completely idle * at least for the five seconds preceding the unclean shutdown. * * This function assumes that the $LogFile journal has already been consistency * checked by a call to ntfs_check_logfile() and in particular if the $LogFile * is empty this function requires that NVolLogFileEmpty() is true otherwise an * empty volume will be reported as dirty. */ BOOL ntfs_is_logfile_clean(ntfs_attr *log_na, RESTART_PAGE_HEADER *rp) { RESTART_AREA *ra; ntfs_log_trace("Entering.\n"); /* An empty $LogFile must have been clean before it got emptied. */ if (NVolLogFileEmpty(log_na->ni->vol)) { ntfs_log_trace("$LogFile is empty\n"); return TRUE; } if (!rp) { ntfs_log_error("Restart page header is NULL\n"); return FALSE; } if (!ntfs_is_rstr_record(rp->magic) && !ntfs_is_chkd_record(rp->magic)) { ntfs_log_error("Restart page buffer is invalid\n"); return FALSE; } ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); /* * If the $LogFile has active clients, i.e. it is open, and we do not * have the RESTART_VOLUME_IS_CLEAN bit set in the restart area flags, * we assume there was an unclean shutdown. */ if (ra->client_in_use_list != LOGFILE_NO_CLIENT && !(ra->flags & RESTART_VOLUME_IS_CLEAN)) { ntfs_log_error("The disk contains an unclean file system (%d, " "%d).\n", le16_to_cpu(ra->client_in_use_list), le16_to_cpu(ra->flags)); return FALSE; } /* $LogFile indicates a clean shutdown. */ ntfs_log_trace("$LogFile indicates a clean shutdown\n"); return TRUE; } /** * ntfs_empty_logfile - empty the contents of the $LogFile journal * @na: ntfs attribute of journal $LogFile to empty * * Empty the contents of the $LogFile journal @na and return 0 on success and * -1 on error. * * This function assumes that the $LogFile journal has already been consistency * checked by a call to ntfs_check_logfile() and that ntfs_is_logfile_clean() * has been used to ensure that the $LogFile is clean. */ int ntfs_empty_logfile(ntfs_attr *na) { s64 pos, count; char buf[NTFS_BUF_SIZE]; ntfs_log_trace("Entering.\n"); if (NVolLogFileEmpty(na->ni->vol)) return 0; if (!NAttrNonResident(na)) { errno = EIO; ntfs_log_perror("Resident $LogFile $DATA attribute"); return -1; } memset(buf, -1, NTFS_BUF_SIZE); pos = 0; while ((count = na->data_size - pos) > 0) { if (count > NTFS_BUF_SIZE) count = NTFS_BUF_SIZE; count = ntfs_attr_pwrite(na, pos, count, buf); if (count <= 0) { ntfs_log_perror("Failed to reset $LogFile"); if (count != -1) errno = EIO; return -1; } pos += count; } NVolSetLogFileEmpty(na->ni->vol); return 0; }
