/*
* logfile.c - NTFS kernel journal handling. Part of the Linux-NTFS project.
*
- * Copyright (c) 2002-2004 Anton Altaparmakov
+ * Copyright (c) 2002-2005 Anton Altaparmakov
*
* 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
RESTART_PAGE_HEADER *rp, s64 pos)
{
u32 logfile_system_page_size, logfile_log_page_size;
- u16 usa_count, usa_ofs, usa_end, ra_ofs;
+ u16 ra_ofs, usa_count, usa_ofs, usa_end = 0;
+ BOOL have_usa = TRUE;
ntfs_debug("Entering.");
/*
(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)) {
"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,
* - within the system page size.
*/
ra_ofs = le16_to_cpu(rp->restart_area_offset);
- if (ra_ofs & 7 || ra_ofs < usa_end ||
+ 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, "$LogFile restart page specifies "
"inconsistent restart area offset.");
*/
if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) {
ntfs_error(vi->i_sb, "$LogFile restart page is not modified "
- "chkdsk but a chkdsk LSN is specified.");
+ "by chkdsk but a chkdsk LSN is specified.");
return FALSE;
}
ntfs_debug("Done.");
* @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: copy of the multi sector transfer deprotected restart page
+ * @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 TRUE if it is
- * consistent and FALSE otherwise.
+ * 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 succes *@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 BOOL ntfs_check_and_load_restart_page(struct inode *vi,
- RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp)
+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;
- BOOL ret;
+ 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 FALSE;
+ return -EINVAL;
}
/* Check the restart area for consistency. */
if (!ntfs_check_restart_area(vi, rp)) {
/* Error output already done inside the function. */
- return FALSE;
+ return -EINVAL;
}
ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset));
/*
if (!trp) {
ntfs_error(vi->i_sb, "Failed to allocate memory for $LogFile "
"restart page buffer.");
- return FALSE;
+ return -ENOMEM;
}
/*
* Read the whole of the restart page into the buffer. If it fits
if (IS_ERR(page)) {
ntfs_error(vi->i_sb, "Error mapping $LogFile "
"page (index %lu).", idx);
+ err = PTR_ERR(page);
+ if (err != -EIO && err != -ENOMEM)
+ err = -EIO;
goto err_out;
}
size = min_t(int, to_read, PAGE_CACHE_SIZE);
idx++;
} while (to_read > 0);
}
- /* Perform the multi sector transfer deprotection on the buffer. */
- if (post_read_mst_fixup((NTFS_RECORD*)trp,
+ /*
+ * Perform the multi sector transfer deprotection on the buffer if the
+ * restart page is protected.
+ */
+ if ((!ntfs_is_chkd_record(trp->magic) || le16_to_cpu(trp->usa_count))
+ && post_read_mst_fixup((NTFS_RECORD*)trp,
le32_to_cpu(rp->system_page_size))) {
- ntfs_error(vi->i_sb, "Multi sector transfer error detected in "
- "$LogFile restart page.");
- goto err_out;
+ /*
+ * 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);
}
- /* Check the log client records for consistency. */
- ret = ntfs_check_log_client_array(vi, trp);
- if (ret && wrp)
- *wrp = trp;
- else
- ntfs_free(trp);
ntfs_debug("Done.");
- return ret;
+ if (wrp)
+ *wrp = trp;
+ else {
err_out:
- ntfs_free(trp);
- return FALSE;
+ ntfs_free(trp);
+ }
+ return err;
}
/**
- * ntfs_ckeck_logfile - check in the journal if the volume is consistent
+ * 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.
+ * 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.
* 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)
+BOOL ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
{
- s64 size, pos, rstr1_pos, rstr2_pos;
+ 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, log_page_mask, ofs;
+ int log_page_size, log_page_mask, err;
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_vi->i_size;
+ size = i_size_read(log_vi);
/* Make sure the file doesn't exceed the maximum allowed size. */
if (size > MaxLogFileSize)
size = MaxLogFileSize;
log_page_size = PAGE_CACHE_SIZE;
log_page_mask = log_page_size - 1;
/*
- * Use generic_ffs() instead of ffs() to enable the compiler to
+ * Use ntfs_ffs() instead of ffs() to enable the compiler to
* optimize log_page_size and log_page_bits into constants.
*/
- log_page_bits = generic_ffs(log_page_size) - 1;
- size &= ~(log_page_size - 1);
+ 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 (IS_ERR(page)) {
ntfs_error(vol->sb, "Error mapping $LogFile "
"page (index %lu).", idx);
- return FALSE;
+ goto err_out;
}
}
kaddr = (u8*)page_address(page) + (pos & ~PAGE_CACHE_MASK);
*/
if (ntfs_is_rcrd_recordp((le32*)kaddr))
break;
- /*
- * A modified by chkdsk restart page means we cannot handle
- * this log file.
- */
- if (ntfs_is_chkd_recordp((le32*)kaddr)) {
- ntfs_error(vol->sb, "$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*)kaddr)) {
- /* Skip to the minimum page size for the next one. */
+ /* 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;
}
- /* 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 $LogFile.");
- goto err_out;
- }
- rstr2_found = TRUE;
- rstr2_pos = pos;
- }
/*
- * Check the restart page for consistency and get a copy of the
- * complete multi sector transfer deprotected restart page.
+ * Check the (modified by chkdsk) restart page for consistency
+ * and get a copy of the complete multi sector transfer
+ * deprotected restart page.
*/
- if (!ntfs_check_and_load_restart_page(log_vi,
+ err = ntfs_check_and_load_restart_page(log_vi,
(RESTART_PAGE_HEADER*)kaddr, pos,
- !pos ? &rstr1_ph : &rstr2_ph)) {
- /* Error output already done inside the function. */
- goto err_out;
+ !rstr1_ph ? &rstr1_ph : &rstr2_ph,
+ !rstr1_ph ? &rstr1_lsn : &rstr2_lsn);
+ if (!err) {
+ /*
+ * If we have now found the first (modified by chkdsk)
+ * restart page, continue looking for the second one.
+ */
+ if (!pos) {
+ pos = NTFS_BLOCK_SIZE >> 1;
+ continue;
+ }
+ /*
+ * We have now found the second (modified by chkdsk)
+ * restart page, so we can stop looking.
+ */
+ break;
}
/*
- * We have a valid restart page. The next one must be after
- * a whole system page size as specified by the valid restart
- * page.
+ * Error output already done inside the function. Note, we do
+ * not abort if the restart page was invalid as we might still
+ * find a valid one further in the file.
*/
+ if (err != -EINVAL) {
+ ntfs_unmap_page(page);
+ goto err_out;
+ }
+ /* Continue looking. */
if (!pos)
- pos = le32_to_cpu(rstr1_ph->system_page_size) >> 1;
+ pos = NTFS_BLOCK_SIZE >> 1;
}
- if (page) {
+ if (page)
ntfs_unmap_page(page);
- page = NULL;
- }
if (logfile_is_empty) {
NVolSetLogFileEmpty(vol);
is_empty:
ntfs_debug("Done. ($LogFile is empty.)");
return TRUE;
}
- if (!rstr1_found || !rstr2_found) {
- ntfs_error(vol->sb, "Did not find two restart pages in "
- "$LogFile.");
- goto err_out;
+ if (!rstr1_ph) {
+ BUG_ON(rstr2_ph);
+ ntfs_error(vol->sb, "Did not find any restart pages in "
+ "$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;
}
- /*
- * 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;
- }
- ntfs_free(rstr1_ph);
- ntfs_free(rstr2_ph);
/* All consistency checks passed. */
+ if (rp)
+ *rp = rstr1_ph;
+ else
+ ntfs_free(rstr1_ph);
ntfs_debug("Done.");
return TRUE;
err_out:
- if (page)
- ntfs_unmap_page(page);
if (rstr1_ph)
ntfs_free(rstr1_ph);
- if (rstr2_ph)
- ntfs_free(rstr2_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 $LogFile journal and return TRUE if it indicates the volume was
* shutdown cleanly and FALSE if not.
* is empty this function requires that NVolLogFileEmpty() is true otherwise an
* empty volume will be reported as dirty.
*/
-BOOL ntfs_is_logfile_clean(struct inode *log_vi)
+BOOL ntfs_is_logfile_clean(struct inode *log_vi, const RESTART_PAGE_HEADER *rp)
{
ntfs_volume *vol = NTFS_SB(log_vi->i_sb);
- struct page *page;
- RESTART_PAGE_HEADER *rp;
RESTART_AREA *ra;
ntfs_debug("Entering.");
ntfs_debug("Done. ($LogFile is empty.)");
return TRUE;
}
- /*
- * 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.
- */
- page = ntfs_map_page(log_vi->i_mapping, 0);
- if (IS_ERR(page)) {
- ntfs_error(vol->sb, "Error mapping $LogFile page (index 0).");
+ 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 $LogFile should "
+ "have been consistency checked before calling "
+ "this function.");
return FALSE;
}
- rp = (RESTART_PAGE_HEADER*)page_address(page);
- if (!ntfs_is_rstr_record(rp->magic)) {
- ntfs_error(vol->sb, "No restart page found at offset zero in "
- "$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
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;
+ return FALSE;
}
- ntfs_unmap_page(page);
/* $LogFile indicates a clean shutdown. */
ntfs_debug("Done. $LogFile indicates a clean shutdown.");
return TRUE;
-err_out:
- ntfs_unmap_page(page);
- return FALSE;
}
/**
if (!NVolLogFileEmpty(vol)) {
int err;
- err = ntfs_attr_set(NTFS_I(log_vi), 0, log_vi->i_size, 0xff);
+ err = ntfs_attr_set(NTFS_I(log_vi), 0, i_size_read(log_vi),
+ 0xff);
if (unlikely(err)) {
ntfs_error(vol->sb, "Failed to fill $LogFile with "
"0xff bytes (error code %i).", err);
git://git.onelab.eu / linux-2.6.git / blobdiff