diff --git a/libntfs/logfile.c b/libntfs/logfile.c index 125f49df..e69de29b 100644 --- a/libntfs/logfile.c +++ b/libntfs/logfile.c @@ -1,716 +0,0 @@ -/* - * logfile.c - NTFS journal handling. Part of the Linux-NTFS project. - * - * Copyright (c) 2002-2004 Anton Altaparmakov - * Copyright (c) 2005 Yura Pakhuchiy - * - * 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 Linux-NTFS - * distribution in the file COPYING); if not, write to the Free Software - * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include - -#include "attrib.h" -#include "debug.h" -#include "logfile.h" -#include "volume.h" -#include "mst.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 usa_count, usa_ofs, usa_end, ra_ofs; - - ntfs_debug("Entering."); - /* - * 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_error(vi->i_sb, "$LogFile uses unsupported page size."); - 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_error(vi->i_sb, "Found restart area in incorrect " - "position in $LogFile."); - return FALSE; - } - /* We only know how to handle version 1.1. */ - if (sle16_to_cpu(rp->major_ver) != 1 || - sle16_to_cpu(rp->minor_ver) != 1) { - ntfs_error(vi->i_sb, "$LogFile version %i.%i is not " - "supported. (This driver supports version " - "1.1 only.)", (int)sle16_to_cpu(rp->major_ver), - (int)sle16_to_cpu(rp->minor_ver)); - return FALSE; - } - /* 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_error(vi->i_sb, "$LogFile restart page specifies " - "inconsistent update sequence array count."); - return FALSE; - } - /* Verify the position of the update sequence array. */ - usa_ofs = le16_to_cpu(rp->usa_ofs); - usa_end = usa_ofs + usa_count * sizeof(u16); - if (usa_ofs < sizeof(RESTART_PAGE_HEADER) || - usa_end > NTFS_BLOCK_SIZE - sizeof(u16)) { - ntfs_error(vi->i_sb, "$LogFile restart page specifies " - "inconsistent update sequence array offset."); - return FALSE; - } - /* - * 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 || ra_ofs < usa_end || - ra_ofs > logfile_system_page_size) { - ntfs_error(vi->i_sb, "$LogFile restart page specifies " - "inconsistent restart area offset."); - return FALSE; - } - /* - * Only restart pages modified by chkdsk are allowed to have chkdsk_lsn - * set. - */ - if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) { - ntfs_error(vi->i_sb, "$LogFile restart page is not modified " - "chkdsk but a chkdsk LSN is specified."); - return FALSE; - } - ntfs_debug("Done."); - 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_debug("Entering."); - 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_error(vi->i_sb, "$LogFile restart area specifies " - "inconsistent file offset."); - return FALSE; - } - /* - * Now that we can access ra->client_array_offset, make sure everything - * up to the log client array is before the first word protected by an - * update sequence number. This ensures we can access all of the - * restart area elements safely. Also, the client array offset must be - * aligned to an 8-byte boundary. - */ - ca_ofs = le16_to_cpu(ra->client_array_offset); - if (((ca_ofs + 7) & ~7) != ca_ofs || - ra_ofs + ca_ofs > NTFS_BLOCK_SIZE - sizeof(u16)) { - ntfs_error(vi->i_sb, "$LogFile restart area specifies " - "inconsistent client array offset."); - 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 (ra_ofs + ra_len > le32_to_cpu(rp->system_page_size) || - 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_error(vi->i_sb, "$LogFile restart area is out of bounds " - "of the system page size specified by the " - "restart page header and/or the specified " - "restart area length is inconsistent."); - return FALSE; - } - /* - * The ra->client_free_list and ra->client_in_use_list must be either - * LOGFILE_NO_CLIENT or less than ra->log_clients or they are - * overflowing the client array. - */ - if ((ra->client_free_list != LOGFILE_NO_CLIENT && - le16_to_cpu(ra->client_free_list) >= - le16_to_cpu(ra->log_clients)) || - (ra->client_in_use_list != LOGFILE_NO_CLIENT && - le16_to_cpu(ra->client_in_use_list) >= - le16_to_cpu(ra->log_clients))) { - ntfs_error(vi->i_sb, "$LogFile restart area specifies " - "overflowing client free and/or in use lists."); - 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_error(vi->i_sb, "$LogFile restart area specifies " - "inconsistent sequence number bits."); - return FALSE; - } - /* The log record header length must be a multiple of 8. */ - if (((le16_to_cpu(ra->log_record_header_length) + 7) & ~7) != - le16_to_cpu(ra->log_record_header_length)) { - ntfs_error(vi->i_sb, "$LogFile restart area specifies " - "inconsistent log record header length."); - return FALSE; - } - /* Dito 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_error(vi->i_sb, "$LogFile restart area specifies " - "inconsistent log page data offset."); - return FALSE; - } - ntfs_debug("Done."); - 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; - - ntfs_debug("Entering."); - ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); - 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; - /* 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_debug("Done."); - return TRUE; -err_out: - ntfs_error(vi->i_sb, "$LogFile log client array is corrupt."); - 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: copy of the multi sector transfer deprotected restart page - * - * Check the restart page @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. - * - * 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. - */ -static BOOL ntfs_check_and_load_restart_page(ntfs_attr *log_na, - RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp) -{ - RESTART_AREA *ra; - RESTART_PAGE_HEADER *trp; - BOOL ret; - - ntfs_debug("Entering."); - /* Check the restart page header for consistency. */ - if (!ntfs_check_restart_page_header(rp, pos)) { - /* Error output already done inside the function. */ - return FALSE; - } - /* Check the restart area for consistency. */ - if (!ntfs_check_restart_area(rp)) { - /* Error output already done inside the function. */ - return FALSE; - } - 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. - */ - trp = malloc(le32_to_cpu(rp->system_page_size)); - if (!trp) { - ntfs_error(vi->i_sb, "Failed to allocate memory for $LogFile " - "restart page buffer."); - return FALSE; - } - /* - * Read the whole of the restart page into the buffer. If it fits - * completely inside @rp, just copy it from there. Otherwise read it - * from disk. - */ - if (le32_to_cpu(rp->system_page_size) <= NTFS_BLOCK_SIZE) - memcpy(trp, rp, le32_to_cpu(rp->system_page_size)); - else - if (ntfs_attr_pread(log_na, pos, le32_to_cpu( - rp->system_page_size), trp) != - le32_to_cpu(rp->system_page_size)) { - ntfs_error(, "Failed to read whole restart page into " - "the buffer."); - goto err_out; - } - /* Perform the multi sector transfer deprotection on the buffer. */ - if (ntfs_mst_post_read_fixup((NTFS_RECORD*)trp, - le32_to_cpu(rp->system_page_size))) { - ntfs_error(vi->i_sb, "Multi sector transfer error detected in " - "$LogFile restart page."); - goto err_out; - } - /* Check the log client records for consistency. */ - ret = ntfs_check_log_client_array(trp); - if (ret && wrp) - *wrp = trp; - else - free(trp); - ntfs_debug("Done."); - return ret; -err_out: - free(trp); - return FALSE; -} - -/** - * ntfs_ckeck_logfile - check in the journal if the volume is consistent - * @log_na: ntfs attribute of loaded journal $LogFile to check - * - * Check the $LogFile journal for consistency and return TRUE if it is - * consistent and FALSE if not. - * - * 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) -{ - s64 size, pos, rstr1_pos, rstr2_pos; - ntfs_volume *vol = log_na->ni->vol; - u8 *buf = NULL; - RESTART_PAGE_HEADER *rstr1_ph = NULL; - RESTART_PAGE_HEADER *rstr2_ph = NULL; - int log_page_size, log_page_mask, ofs; - BOOL logfile_is_empty = TRUE; - BOOL rstr1_found = FALSE; - BOOL rstr2_found = FALSE; - u8 log_page_bits; - - ntfs_debug("Entering."); - /* An empty $LogFile must have been clean before it got emptied. */ - if (NVolLogFileEmpty(vol)) - goto is_empty; - size = log_na->data_size; - /* Make sure the file doesn't exceed the maximum allowed size. */ - if (size > (s64)MaxLogFileSize) - size = MaxLogFileSize; - log_page_size = DefaultLogPageSize; - log_page_mask = log_page_size - 1; - /* - * Use generic_ffs() instead of ffs() to enable the compiler to - * optimize log_page_size and log_page_bits into constants. - */ - log_page_bits = ffs(log_page_size) - 1; - size &= ~(log_page_size - 1); - - /* - * Ensure the log file is big enough to store at least the two restart - * pages and the minimum number of log record pages. - */ - if (size < log_page_size * 2 || (size - log_page_size * 2) >> - log_page_bits < MinLogRecordPages) { - ntfs_error(vol->sb, "$LogFile is too small."); - return FALSE; - } - /* Allocate memory for restart page. */ - buf = malloc(NTFS_BLOCK_SIZE); - if (!buf) { - ntfs_error(, "Not enough memory."); - 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 uninitialzed 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, buf) != - NTFS_BLOCK_SIZE) { - ntfs_error(, "Failed to read first NTFS_BLOCK_SIZE " - "bytes of potential restart page."); - 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*)buf)) - 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*)buf)) - break; - /* - * A modified by chkdsk restart page means we cannot handle - * this log file. - */ - if (ntfs_is_chkd_recordp((le32*)buf)) { - ntfs_error(vol->sb, "$LogFile has been modified by " - "chkdsk. Mount this volume in " - "Windows."); - goto err_out; - } - /* If not a restart page, continue. */ - if (!ntfs_is_rstr_recordp((le32*)buf)) { - /* Skip to the minimum page size for the next one. */ - if (!pos) - pos = NTFS_BLOCK_SIZE >> 1; - continue; - } - /* We now know we have a restart page. */ - if (!pos) { - rstr1_found = TRUE; - rstr1_pos = pos; - } else { - if (rstr2_found) { - ntfs_error(vol->sb, "Found more than two " - "restart pages in $LogFile."); - goto err_out; - } - rstr2_found = TRUE; - rstr2_pos = pos; - } - /* - * Check the restart page for consistency and get a copy of the - * complete multi sector transfer deprotected restart page. - */ - if (!ntfs_check_and_load_restart_page(log_na, - (RESTART_PAGE_HEADER*)buf, pos, - !pos ? &rstr1_ph : &rstr2_ph)) { - /* Error output already done inside the function. */ - goto err_out; - } - /* - * We have a valid restart page. The next one must be after - * a whole system page size as specified by the valid restart - * page. - */ - if (!pos) - pos = le32_to_cpu(rstr1_ph->system_page_size) >> 1; - } - if (buf) { - free(buf); - buf = NULL; - } - if (logfile_is_empty) { - NVolSetLogFileEmpty(vol); -is_empty: - ntfs_debug("Done. ($LogFile is empty.)"); - return TRUE; - } - if (!rstr1_found || !rstr2_found) { - ntfs_error(vol->sb, "Did not find two restart pages in " - "$LogFile."); - goto err_out; - } - /* - * The two restart areas must be identical except for the update - * sequence number. - */ - ofs = le16_to_cpu(rstr1_ph->usa_ofs); - if (memcmp(rstr1_ph, rstr2_ph, ofs) || (ofs += sizeof(u16), - memcmp((u8*)rstr1_ph + ofs, (u8*)rstr2_ph + ofs, - le32_to_cpu(rstr1_ph->system_page_size) - ofs))) { - ntfs_error(vol->sb, "The two restart pages in $LogFile do not " - "match."); - goto err_out; - } - free(rstr1_ph); - free(rstr2_ph); - /* All consistency checks passed. */ - ntfs_debug("Done."); - return TRUE; -err_out: - if (buf) - free(buf); - if (rstr1_ph) - free(rstr1_ph); - if (rstr2_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 - * - * 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 preceeding 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_debug("Entering."); - /* An empty $LogFile must have been clean before it got emptied. */ - if (NVolLogFileEmpty(log_na->ni->vol)) { - ntfs_debug("Done. ($LogFile is empty.)"); - return TRUE; - } - /* Allocate memory. */ - rp = malloc(NTFS_BLOCK_SIZE); - if (!rp) { - ntfs_error(, "Not enough memory."); - return FALSE; - } - /* - * Read the first restart page. It will be possibly incomplete and - * will not be multi sector transfer deprotected but we only need the - * first NTFS_BLOCK_SIZE bytes so it does not matter. - */ - if (ntfs_attr_pread(log_na, 0, NTFS_BLOCK_SIZE, rp) != - NTFS_BLOCK_SIZE) { - ntfs_error(, "Failed to read first restart page."); - goto err_out; - } - if (!ntfs_is_rstr_record(rp->magic)) { - ntfs_error(vol->sb, "No restart page found at offset zero in " - "$LogFile. This is probably a bug in that " - "the $LogFile should have been consistency " - "checked before calling this function."); - goto err_out; - } - 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_debug("Done. $LogFile indicates a dirty shutdown."); - goto err_out; - } - free(rp); - /* $LogFile indicates a clean shutdown. */ - ntfs_debug("Done. $LogFile indicates a clean shutdown."); - return TRUE; -err_out: - free(rp); - return FALSE; -} - -/** - * 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 len, pos, count; - char buf[NTFS_BUF_SIZE]; - int err; - - ntfs_debug("Entering."); - if (NVolLogFileEmpty(na->ni->vol)) - goto done; - - /* The $DATA attribute of the $LogFile has to be non-resident. */ - if (!NAttrNonResident(na)) { - err = EIO; - Dprintf("$LogFile $DATA attribute is resident!?!\n"); - goto io_error_exit; - } - - /* Get length of $LogFile contents. */ - len = na->data_size; - if (!len) { - Dprintf("$LogFile has zero length, no disk write needed.\n"); - return 0; - } - - /* Read $LogFile until its end. We do this as a check for correct - length thus making sure we are decompressing the mapping pairs - array correctly and hence writing below is safe as well. */ - pos = 0; - while ((count = ntfs_attr_pread(na, pos, NTFS_BUF_SIZE, buf)) > 0) - pos += count; - - if (count == -1 || pos != len) { - err = errno; - Dprintf("Amount of $LogFile data read does not " - "correspond to expected length!"); - if (count != -1) - err = EIO; - goto io_error_exit; - } - - /* Fill the buffer with 0xff's. */ - memset(buf, -1, NTFS_BUF_SIZE); - - /* Set the $DATA attribute. */ - pos = 0; - while ((count = len - pos) > 0) { - if (count > NTFS_BUF_SIZE) - count = NTFS_BUF_SIZE; - - if ((count = ntfs_attr_pwrite(na, pos, count, buf)) <= 0) { - err = errno; - Dprintf("Failed to set the $LogFile attribute value."); - if (count != -1) - err = EIO; - goto io_error_exit; - } - pos += count; - } - - /* Set the flag so we do not have to do it again on remount. */ - NVolSetLogFileEmpty(na->ni->vol); -done: - ntfs_debug("Done."); - return 0; -io_error_exit: - ntfs_attr_close(na); - ntfs_inode_close(na->ni); - errno = err; - return -1; -}