diff options
Diffstat (limited to 'fs/ntfs/logfile.c')
| -rw-r--r-- | fs/ntfs/logfile.c | 849 |
1 files changed, 0 insertions, 849 deletions
diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c deleted file mode 100644 index 6ce60ffc6ac0..000000000000 --- a/fs/ntfs/logfile.c +++ /dev/null @@ -1,849 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * logfile.c - NTFS kernel journal handling. Part of the Linux-NTFS project. - * - * Copyright (c) 2002-2007 Anton Altaparmakov - */ - -#ifdef NTFS_RW - -#include <linux/types.h> -#include <linux/fs.h> -#include <linux/highmem.h> -#include <linux/buffer_head.h> -#include <linux/bitops.h> -#include <linux/log2.h> -#include <linux/bio.h> - -#include "attrib.h" -#include "aops.h" -#include "debug.h" -#include "logfile.h" -#include "malloc.h" -#include "volume.h" -#include "ntfs.h" - -/** - * ntfs_check_restart_page_header - check the page header for consistency - * @vi: $LogFile inode to which the restart page header belongs - * @rp: restart page header to check - * @pos: position in @vi at which the restart page header resides - * - * Check the restart page header @rp for consistency and return 'true' if it is - * consistent and 'false' otherwise. - * - * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not - * require the full restart page. - */ -static bool ntfs_check_restart_page_header(struct inode *vi, - RESTART_PAGE_HEADER *rp, s64 pos) -{ - u32 logfile_system_page_size, logfile_log_page_size; - u16 ra_ofs, usa_count, usa_ofs, usa_end = 0; - bool have_usa = true; - - ntfs_debug("Entering."); - /* - * If the system or log page sizes are smaller than the ntfs block size - * or either is not a power of 2 we cannot handle this log file. - */ - logfile_system_page_size = le32_to_cpu(rp->system_page_size); - logfile_log_page_size = le32_to_cpu(rp->log_page_size); - if (logfile_system_page_size < NTFS_BLOCK_SIZE || - logfile_log_page_size < NTFS_BLOCK_SIZE || - logfile_system_page_size & - (logfile_system_page_size - 1) || - !is_power_of_2(logfile_log_page_size)) { - ntfs_error(vi->i_sb, "$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; - } - /* - * 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_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; - } -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 < sizeof(RESTART_PAGE_HEADER)) || - 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 " - "by chkdsk but a chkdsk LSN is specified."); - return false; - } - ntfs_debug("Done."); - return true; -} - -/** - * ntfs_check_restart_area - check the restart area for consistency - * @vi: $LogFile inode to which the restart page belongs - * @rp: restart page whose restart area to check - * - * Check the restart area of the restart page @rp for consistency and return - * 'true' if it is consistent and 'false' otherwise. - * - * This function assumes that the restart page header has already been - * consistency checked. - * - * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not - * require the full restart page. - */ -static bool ntfs_check_restart_area(struct inode *vi, RESTART_PAGE_HEADER *rp) -{ - u64 file_size; - RESTART_AREA *ra; - u16 ra_ofs, ra_len, ca_ofs; - u8 fs_bits; - - ntfs_debug("Entering."); - ra_ofs = le16_to_cpu(rp->restart_area_offset); - ra = (RESTART_AREA*)((u8*)rp + ra_ofs); - /* - * Everything before ra->file_size must be before the first word - * protected by an update sequence number. This ensures that it is - * safe to access ra->client_array_offset. - */ - if (ra_ofs + offsetof(RESTART_AREA, file_size) > - NTFS_BLOCK_SIZE - sizeof(u16)) { - ntfs_error(vi->i_sb, "$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, "$LogFile restart area specifies " - "overflowing client free and/or in use lists."); - return false; - } - /* - * Check ra->seq_number_bits against ra->file_size for consistency. - * We cannot just use ffs() because the file size is not a power of 2. - */ - file_size = (u64)sle64_to_cpu(ra->file_size); - fs_bits = 0; - while (file_size) { - file_size >>= 1; - fs_bits++; - } - if (le32_to_cpu(ra->seq_number_bits) != 67 - fs_bits) { - ntfs_error(vi->i_sb, "$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 - * @vi: $LogFile inode to which the restart page belongs - * @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(struct inode *vi, - 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 - * @vi: $LogFile inode to which the restart page belongs - * @rp: restart page to check - * @pos: position in @vi 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. - * - * Simillarly, 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(struct inode *vi, - RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp, - LSN *lsn) -{ - RESTART_AREA *ra; - RESTART_PAGE_HEADER *trp; - int size, err; - - ntfs_debug("Entering."); - /* Check the restart page header for consistency. */ - if (!ntfs_check_restart_page_header(vi, rp, pos)) { - /* Error output already done inside the function. */ - return -EINVAL; - } - /* Check the restart area for consistency. */ - if (!ntfs_check_restart_area(vi, 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. - */ - trp = ntfs_malloc_nofs(le32_to_cpu(rp->system_page_size)); - if (!trp) { - ntfs_error(vi->i_sb, "Failed to allocate memory for $LogFile " - "restart page buffer."); - return -ENOMEM; - } - /* - * Read the whole of the restart page into the buffer. If it fits - * completely inside @rp, just copy it from there. Otherwise map all - * the required pages and copy the data from them. - */ - size = PAGE_SIZE - (pos & ~PAGE_MASK); - if (size >= le32_to_cpu(rp->system_page_size)) { - memcpy(trp, rp, le32_to_cpu(rp->system_page_size)); - } else { - pgoff_t idx; - struct page *page; - int have_read, to_read; - - /* First copy what we already have in @rp. */ - memcpy(trp, rp, size); - /* Copy the remaining data one page at a time. */ - have_read = size; - to_read = le32_to_cpu(rp->system_page_size) - size; - idx = (pos + size) >> PAGE_SHIFT; - BUG_ON((pos + size) & ~PAGE_MASK); - do { - page = ntfs_map_page(vi->i_mapping, idx); - if (IS_ERR(page)) { - ntfs_error(vi->i_sb, "Error mapping $LogFile " - "page (index %lu).", idx); - err = PTR_ERR(page); - if (err != -EIO && err != -ENOMEM) - err = -EIO; - goto err_out; - } - size = min_t(int, to_read, PAGE_SIZE); - memcpy((u8*)trp + have_read, page_address(page), size); - ntfs_unmap_page(page); - have_read += size; - to_read -= size; - idx++; - } while (to_read > 0); - } - /* - * 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)) - && post_read_mst_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 - sizeof(u16)) { - ntfs_error(vi->i_sb, "Multi sector transfer error " - "detected in $LogFile restart page."); - 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(vi, 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_debug("Done."); - if (wrp) - *wrp = trp; - else { -err_out: - ntfs_free(trp); - } - return err; -} - -/** - * ntfs_check_logfile - check the journal for consistency - * @log_vi: struct inode 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(struct inode *log_vi, RESTART_PAGE_HEADER **rp) -{ - s64 size, pos; - LSN rstr1_lsn, rstr2_lsn; - ntfs_volume *vol = NTFS_SB(log_vi->i_sb); - struct address_space *mapping = log_vi->i_mapping; - struct page *page = NULL; - 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_debug("Entering."); - /* An empty $LogFile must have been clean before it got emptied. */ - if (NVolLogFileEmpty(vol)) - goto is_empty; - size = i_size_read(log_vi); - /* Make sure the file doesn't exceed the maximum allowed size. */ - if (size > MaxLogFileSize) - size = MaxLogFileSize; - /* - * Truncate size to a multiple of the page cache size or the default - * log page size if the page cache size is between the default log page - * log page size if the page cache size is between the default log page - * size and twice that. - */ - if (PAGE_SIZE >= DefaultLogPageSize && PAGE_SIZE <= - DefaultLogPageSize * 2) - log_page_size = DefaultLogPageSize; - else - log_page_size = PAGE_SIZE; - /* - * Use ntfs_ffs() instead of ffs() to enable the compiler to - * optimize log_page_size and log_page_bits into constants. - */ - log_page_bits = ntfs_ffs(log_page_size) - 1; - size &= ~(s64)(log_page_size - 1); - /* - * Ensure the log file is big enough to store at least the two restart - * pages and the minimum number of log record pages. - */ - if (size < log_page_size * 2 || (size - log_page_size * 2) >> - log_page_bits < MinLogRecordPages) { - ntfs_error(vol->sb, "$LogFile is too small."); - return false; - } - /* - * 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) { - pgoff_t idx = pos >> PAGE_SHIFT; - if (!page || page->index != idx) { - if (page) - ntfs_unmap_page(page); - page = ntfs_map_page(mapping, idx); - if (IS_ERR(page)) { - ntfs_error(vol->sb, "Error mapping $LogFile " - "page (index %lu).", idx); - goto err_out; - } - } - kaddr = (u8*)page_address(page) + (pos & ~PAGE_MASK); - /* - * A non-empty block means the logfile is not empty while an - * empty block after a non-empty block has been encountered - * means we are done. - */ - if (!ntfs_is_empty_recordp((le32*)kaddr)) - logfile_is_empty = false; - else if (!logfile_is_empty) - break; - /* - * A log record page means there cannot be a restart page after - * this so no need to continue searching. - */ - if (ntfs_is_rcrd_recordp((le32*)kaddr)) - break; - /* If not a (modified by chkdsk) restart page, continue. */ - if (!ntfs_is_rstr_recordp((le32*)kaddr) && - !ntfs_is_chkd_recordp((le32*)kaddr)) { - if (!pos) - pos = NTFS_BLOCK_SIZE >> 1; - continue; - } - /* - * Check the (modified by chkdsk) restart page for consistency - * and get a copy of the complete multi sector transfer - * deprotected restart page. - */ - err = ntfs_check_and_load_restart_page(log_vi, - (RESTART_PAGE_HEADER*)kaddr, pos, - !rstr1_ph ? &rstr1_ph : &rstr2_ph, - !rstr1_ph ? &rstr1_lsn : &rstr2_lsn); - if (!err) { - /* - * If we have now found the first (modified by chkdsk) - * restart page, continue looking for the second one. - */ - if (!pos) { - pos = NTFS_BLOCK_SIZE >> 1; - continue; - } - /* - * We have now found the second (modified by chkdsk) - * restart page, so we can stop looking. - */ - break; - } - /* - * Error output already done inside the function. Note, we do - * not abort if the restart page was invalid as we might still - * find a valid one further in the file. - */ - if (err != -EINVAL) { - ntfs_unmap_page(page); - goto err_out; - } - /* Continue looking. */ - if (!pos) - pos = NTFS_BLOCK_SIZE >> 1; - } - if (page) - ntfs_unmap_page(page); - if (logfile_is_empty) { - NVolSetLogFileEmpty(vol); -is_empty: - ntfs_debug("Done. ($LogFile is empty.)"); - return true; - } - if (!rstr1_ph) { - BUG_ON(rstr2_ph); - ntfs_error(vol->sb, "Did not find any restart pages in " - "$LogFile and it was not empty."); - 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_debug("Using second restart page as it is more " - "recent."); - ntfs_free(rstr1_ph); - rstr1_ph = rstr2_ph; - /* rstr1_lsn = rstr2_lsn; */ - } else { - ntfs_debug("Using first restart page as it is more " - "recent."); - ntfs_free(rstr2_ph); - } - rstr2_ph = NULL; - } - /* All consistency checks passed. */ - if (rp) - *rp = rstr1_ph; - else - ntfs_free(rstr1_ph); - ntfs_debug("Done."); - return true; -err_out: - if (rstr1_ph) - ntfs_free(rstr1_ph); - return false; -} - -/** - * ntfs_is_logfile_clean - check in the journal if the volume is clean - * @log_vi: struct inode 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(struct inode *log_vi, const RESTART_PAGE_HEADER *rp) -{ - ntfs_volume *vol = NTFS_SB(log_vi->i_sb); - RESTART_AREA *ra; - - ntfs_debug("Entering."); - /* An empty $LogFile must have been clean before it got emptied. */ - if (NVolLogFileEmpty(vol)) { - ntfs_debug("Done. ($LogFile is empty.)"); - return true; - } - BUG_ON(!rp); - if (!ntfs_is_rstr_record(rp->magic) && - !ntfs_is_chkd_record(rp->magic)) { - ntfs_error(vol->sb, "Restart page buffer is invalid. This is " - "probably a bug in that the $LogFile should " - "have been consistency checked before calling " - "this function."); - 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_debug("Done. $LogFile indicates a dirty shutdown."); - return false; - } - /* $LogFile indicates a clean shutdown. */ - ntfs_debug("Done. $LogFile indicates a clean shutdown."); - return true; -} - -/** - * ntfs_empty_logfile - empty the contents of the $LogFile journal - * @log_vi: struct inode of loaded journal $LogFile to empty - * - * Empty the contents of the $LogFile journal @log_vi and return 'true' on - * success and 'false' 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. - */ -bool ntfs_empty_logfile(struct inode *log_vi) -{ - VCN vcn, end_vcn; - ntfs_inode *log_ni = NTFS_I(log_vi); - ntfs_volume *vol = log_ni->vol; - struct super_block *sb = vol->sb; - runlist_element *rl; - unsigned long flags; - unsigned block_size, block_size_bits; - int err; - bool should_wait = true; - - ntfs_debug("Entering."); - if (NVolLogFileEmpty(vol)) { - ntfs_debug("Done."); - return true; - } - /* - * We cannot use ntfs_attr_set() because we may be still in the middle - * of a mount operation. Thus we do the emptying by hand by first - * zapping the page cache pages for the $LogFile/$DATA attribute and - * then emptying each of the buffers in each of the clusters specified - * by the runlist by hand. - */ - block_size = sb->s_blocksize; - block_size_bits = sb->s_blocksize_bits; - vcn = 0; - read_lock_irqsave(&log_ni->size_lock, flags); - end_vcn = (log_ni->initialized_size + vol->cluster_size_mask) >> - vol->cluster_size_bits; - read_unlock_irqrestore(&log_ni->size_lock, flags); - truncate_inode_pages(log_vi->i_mapping, 0); - down_write(&log_ni->runlist.lock); - rl = log_ni->runlist.rl; - if (unlikely(!rl || vcn < rl->vcn || !rl->length)) { -map_vcn: - err = ntfs_map_runlist_nolock(log_ni, vcn, NULL); - if (err) { - ntfs_error(sb, "Failed to map runlist fragment (error " - "%d).", -err); - goto err; - } - rl = log_ni->runlist.rl; - BUG_ON(!rl || vcn < rl->vcn || !rl->length); - } - /* Seek to the runlist element containing @vcn. */ - while (rl->length && vcn >= rl[1].vcn) - rl++; - do { - LCN lcn; - sector_t block, end_block; - s64 len; - - /* - * If this run is not mapped map it now and start again as the - * runlist will have been updated. - */ - lcn = rl->lcn; - if (unlikely(lcn == LCN_RL_NOT_MAPPED)) { - vcn = rl->vcn; - goto map_vcn; - } - /* If this run is not valid abort with an error. */ - if (unlikely(!rl->length || lcn < LCN_HOLE)) - goto rl_err; - /* Skip holes. */ - if (lcn == LCN_HOLE) - continue; - block = lcn << vol->cluster_size_bits >> block_size_bits; - len = rl->length; - if (rl[1].vcn > end_vcn) - len = end_vcn - rl->vcn; - end_block = (lcn + len) << vol->cluster_size_bits >> - block_size_bits; - /* Iterate over the blocks in the run and empty them. */ - do { - struct buffer_head *bh; - - /* Obtain the buffer, possibly not uptodate. */ - bh = sb_getblk(sb, block); - BUG_ON(!bh); - /* Setup buffer i/o submission. */ - lock_buffer(bh); - bh->b_end_io = end_buffer_write_sync; - get_bh(bh); - /* Set the entire contents of the buffer to 0xff. */ - memset(bh->b_data, -1, block_size); - if (!buffer_uptodate(bh)) - set_buffer_uptodate(bh); - if (buffer_dirty(bh)) - clear_buffer_dirty(bh); - /* - * Submit the buffer and wait for i/o to complete but - * only for the first buffer so we do not miss really - * serious i/o errors. Once the first buffer has - * completed ignore errors afterwards as we can assume - * that if one buffer worked all of them will work. - */ - submit_bh(REQ_OP_WRITE, bh); - if (should_wait) { - should_wait = false; - wait_on_buffer(bh); - if (unlikely(!buffer_uptodate(bh))) - goto io_err; - } - brelse(bh); - } while (++block < end_block); - } while ((++rl)->vcn < end_vcn); - up_write(&log_ni->runlist.lock); - /* - * Zap the pages again just in case any got instantiated whilst we were - * emptying the blocks by hand. FIXME: We may not have completed - * writing to all the buffer heads yet so this may happen too early. - * We really should use a kernel thread to do the emptying - * asynchronously and then we can also set the volume dirty and output - * an error message if emptying should fail. - */ - truncate_inode_pages(log_vi->i_mapping, 0); - /* Set the flag so we do not have to do it again on remount. */ - NVolSetLogFileEmpty(vol); - ntfs_debug("Done."); - return true; -io_err: - ntfs_error(sb, "Failed to write buffer. Unmount and run chkdsk."); - goto dirty_err; -rl_err: - ntfs_error(sb, "Runlist is corrupt. Unmount and run chkdsk."); -dirty_err: - NVolSetErrors(vol); - err = -EIO; -err: - up_write(&log_ni->runlist.lock); - ntfs_error(sb, "Failed to fill $LogFile with 0xff bytes (error %d).", - -err); - return false; -} - -#endif /* NTFS_RW */ |