* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <linux/buffer_head.h>
#include <linux/swap.h>
-#include "attrib.h"
-#include "aops.h"
-#include "bitmap.h"
-#include "debug.h"
-#include "dir.h"
-#include "lcnalloc.h"
-#include "malloc.h"
-#include "mft.h"
#include "ntfs.h"
+/**
+ * __format_mft_record - initialize an empty mft record
+ * @m: mapped, pinned and locked for writing mft record
+ * @size: size of the mft record
+ * @rec_no: mft record number / inode number
+ *
+ * Private function to initialize an empty mft record. Use one of the two
+ * provided format_mft_record() functions instead.
+ */
+static void __format_mft_record(MFT_RECORD *m, const int size,
+ const unsigned long rec_no)
+{
+ ATTR_RECORD *a;
+
+ memset(m, 0, size);
+ m->magic = magic_FILE;
+ /* Aligned to 2-byte boundary. */
+ m->usa_ofs = cpu_to_le16((sizeof(MFT_RECORD) + 1) & ~1);
+ m->usa_count = cpu_to_le16(size / NTFS_BLOCK_SIZE + 1);
+ /* Set the update sequence number to 1. */
+ *(le16*)((char*)m + ((sizeof(MFT_RECORD) + 1) & ~1)) = cpu_to_le16(1);
+ m->lsn = cpu_to_le64(0LL);
+ m->sequence_number = cpu_to_le16(1);
+ m->link_count = 0;
+ /* Aligned to 8-byte boundary. */
+ m->attrs_offset = cpu_to_le16((le16_to_cpu(m->usa_ofs) +
+ (le16_to_cpu(m->usa_count) << 1) + 7) & ~7);
+ m->flags = 0;
+ /*
+ * Using attrs_offset plus eight bytes (for the termination attribute),
+ * aligned to 8-byte boundary.
+ */
+ m->bytes_in_use = cpu_to_le32((le16_to_cpu(m->attrs_offset) + 8 + 7) &
+ ~7);
+ m->bytes_allocated = cpu_to_le32(size);
+ m->base_mft_record = cpu_to_le64((MFT_REF)0);
+ m->next_attr_instance = 0;
+ a = (ATTR_RECORD*)((char*)m + le16_to_cpu(m->attrs_offset));
+ a->type = AT_END;
+ a->length = 0;
+}
+
+/**
+ * format_mft_record - initialize an empty mft record
+ * @ni: ntfs inode of mft record
+ * @mft_rec: mapped, pinned and locked mft record (optional)
+ *
+ * Initialize an empty mft record. This is used when extending the MFT.
+ *
+ * If @mft_rec is NULL, we call map_mft_record() to obtain the
+ * record and we unmap it again when finished.
+ *
+ * We return 0 on success or -errno on error.
+ */
+int format_mft_record(ntfs_inode *ni, MFT_RECORD *mft_rec)
+{
+ MFT_RECORD *m;
+
+ if (mft_rec)
+ m = mft_rec;
+ else {
+ m = map_mft_record(ni);
+ if (IS_ERR(m))
+ return PTR_ERR(m);
+ }
+ __format_mft_record(m, ni->vol->mft_record_size, ni->mft_no);
+ if (!mft_rec) {
+ // FIXME: Need to set the mft record dirty!
+ unmap_mft_record(ni);
+ }
+ return 0;
+}
+
+/**
+ * ntfs_readpage - external declaration, function is in fs/ntfs/aops.c
+ */
+extern int ntfs_readpage(struct file *, struct page *);
+
+#ifdef NTFS_RW
+/**
+ * ntfs_mft_writepage - forward declaration, function is further below
+ */
+static int ntfs_mft_writepage(struct page *page, struct writeback_control *wbc);
+#endif /* NTFS_RW */
+
+/**
+ * ntfs_mft_aops - address space operations for access to $MFT
+ *
+ * Address space operations for access to $MFT. This allows us to simply use
+ * ntfs_map_page() in map_mft_record_page().
+ */
+struct address_space_operations ntfs_mft_aops = {
+ .readpage = ntfs_readpage, /* Fill page with data. */
+ .sync_page = block_sync_page, /* Currently, just unplugs the
+ disk request queue. */
+#ifdef NTFS_RW
+ .writepage = ntfs_mft_writepage, /* Write out the dirty mft
+ records in a page. */
+ .set_page_dirty = __set_page_dirty_nobuffers, /* Set the page dirty
+ without touching the buffers
+ belonging to the page. */
+#endif /* NTFS_RW */
+};
+
/**
* map_mft_record_page - map the page in which a specific mft record resides
* @ni: ntfs inode whose mft record page to map
if (index > end_index || (mft_vi->i_size & ~PAGE_CACHE_MASK) <
ofs + vol->mft_record_size) {
page = ERR_PTR(-ENOENT);
- ntfs_error(vol->sb, "Attemt to read mft record 0x%lx, "
- "which is beyond the end of the mft. "
- "This is probably a bug in the ntfs "
- "driver.", ni->mft_no);
goto err_out;
}
}
/* Read, map, and pin the page. */
page = ntfs_map_page(mft_vi->i_mapping, index);
if (likely(!IS_ERR(page))) {
- /* Catch multi sector transfer fixup errors. */
- if (likely(ntfs_is_mft_recordp((le32*)(page_address(page) +
- ofs)))) {
- ni->page = page;
- ni->page_ofs = ofs;
- return page_address(page) + ofs;
- }
- ntfs_error(vol->sb, "Mft record 0x%lx is corrupt. "
- "Run chkdsk.", ni->mft_no);
- ntfs_unmap_page(page);
- page = ERR_PTR(-EIO);
+ ni->page = page;
+ ni->page_ofs = ofs;
+ return page_address(page) + ofs;
}
err_out:
ni->page = NULL;
ni->page_ofs = 0;
+ ntfs_error(vol->sb, "Failed with error code %lu.", -PTR_ERR(page));
return (void*)page;
}
ntfs_clear_extent_inode(ni);
goto map_err_out;
}
- /* Verify the sequence number if it is present. */
- if (seq_no && (le16_to_cpu(m->sequence_number) != seq_no)) {
+ /* Verify the sequence number. */
+ if (unlikely(le16_to_cpu(m->sequence_number) != seq_no)) {
ntfs_error(base_ni->vol->sb, "Found stale extent mft "
"reference! Corrupt file system. Run chkdsk.");
destroy_ni = TRUE;
*/
void __mark_mft_record_dirty(ntfs_inode *ni)
{
+ struct page *page = ni->page;
ntfs_inode *base_ni;
ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
+ BUG_ON(!page);
BUG_ON(NInoAttr(ni));
- mark_ntfs_record_dirty(ni->page, ni->page_ofs);
+
+ /*
+ * Set the page containing the mft record dirty. This also marks the
+ * $MFT inode dirty (I_DIRTY_PAGES).
+ */
+ __set_page_dirty_nobuffers(page);
+
/* Determine the base vfs inode and mark it dirty, too. */
down(&ni->extent_lock);
if (likely(ni->nr_extents >= 0))
"this message. Thank you.";
/**
- * ntfs_sync_mft_mirror_umount - synchronise an mft record to the mft mirror
- * @vol: ntfs volume on which the mft record to synchronize resides
- * @mft_no: mft record number of mft record to synchronize
+ * sync_mft_mirror_umount - synchronise an mft record to the mft mirror
+ * @ni: ntfs inode whose mft record to synchronize
* @m: mapped, mst protected (extent) mft record to synchronize
*
- * Write the mapped, mst protected (extent) mft record @m with mft record
- * number @mft_no to the mft mirror ($MFTMirr) of the ntfs volume @vol,
- * bypassing the page cache and the $MFTMirr inode itself.
+ * Write the mapped, mst protected (extent) mft record @m described by the
+ * (regular or extent) ntfs inode @ni to the mft mirror ($MFTMirr) bypassing
+ * the page cache and the $MFTMirr inode itself.
*
* This function is only for use at umount time when the mft mirror inode has
* already been disposed off. We BUG() if we are called while the mft mirror
* alternative would be either to BUG() or to get a NULL pointer dereference
* and Oops.
*/
-static int ntfs_sync_mft_mirror_umount(ntfs_volume *vol,
- const unsigned long mft_no, MFT_RECORD *m)
+static int sync_mft_mirror_umount(ntfs_inode *ni, MFT_RECORD *m)
{
+ ntfs_volume *vol = ni->vol;
+
BUG_ON(vol->mftmirr_ino);
ntfs_error(vol->sb, "Umount time mft mirror syncing is not "
"implemented yet. %s", ntfs_please_email);
}
/**
- * ntfs_sync_mft_mirror - synchronize an mft record to the mft mirror
- * @vol: ntfs volume on which the mft record to synchronize resides
- * @mft_no: mft record number of mft record to synchronize
+ * sync_mft_mirror - synchronize an mft record to the mft mirror
+ * @ni: ntfs inode whose mft record to synchronize
* @m: mapped, mst protected (extent) mft record to synchronize
* @sync: if true, wait for i/o completion
*
- * Write the mapped, mst protected (extent) mft record @m with mft record
- * number @mft_no to the mft mirror ($MFTMirr) of the ntfs volume @vol.
+ * Write the mapped, mst protected (extent) mft record @m described by the
+ * (regular or extent) ntfs inode @ni to the mft mirror ($MFTMirr).
*
* On success return 0. On error return -errno and set the volume errors flag
- * in the ntfs volume @vol.
+ * in the ntfs_volume to which @ni belongs.
*
* NOTE: We always perform synchronous i/o and ignore the @sync parameter.
*
* TODO: If @sync is false, want to do truly asynchronous i/o, i.e. just
* schedule i/o via ->writepage or do it via kntfsd or whatever.
*/
-int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
- MFT_RECORD *m, int sync)
+static int sync_mft_mirror(ntfs_inode *ni, MFT_RECORD *m, int sync)
{
+ ntfs_volume *vol = ni->vol;
struct page *page;
unsigned int blocksize = vol->sb->s_blocksize;
int max_bhs = vol->mft_record_size / blocksize;
struct buffer_head *bhs[max_bhs];
struct buffer_head *bh, *head;
u8 *kmirr;
- runlist_element *rl;
- unsigned int block_start, block_end, m_start, m_end, page_ofs;
+ unsigned int block_start, block_end, m_start, m_end;
int i_bhs, nr_bhs, err = 0;
- unsigned char blocksize_bits = vol->mftmirr_ino->i_blkbits;
- ntfs_debug("Entering for inode 0x%lx.", mft_no);
+ ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
BUG_ON(!max_bhs);
if (unlikely(!vol->mftmirr_ino)) {
/* This could happen during umount... */
- err = ntfs_sync_mft_mirror_umount(vol, mft_no, m);
+ err = sync_mft_mirror_umount(ni, m);
if (likely(!err))
return err;
goto err_out;
}
/* Get the page containing the mirror copy of the mft record @m. */
- page = ntfs_map_page(vol->mftmirr_ino->i_mapping, mft_no >>
+ page = ntfs_map_page(vol->mftmirr_ino->i_mapping, ni->mft_no >>
(PAGE_CACHE_SHIFT - vol->mft_record_size_bits));
if (IS_ERR(page)) {
ntfs_error(vol->sb, "Failed to map mft mirror page.");
err = PTR_ERR(page);
goto err_out;
}
+ /*
+ * Exclusion against other writers. This should never be a problem
+ * since the page in which the mft record @m resides is also locked and
+ * hence any other writers would be held up there but it is better to
+ * make sure no one is writing from elsewhere.
+ */
lock_page(page);
- BUG_ON(!PageUptodate(page));
- ClearPageUptodate(page);
- /* Offset of the mft mirror record inside the page. */
- page_ofs = (mft_no << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK;
/* The address in the page of the mirror copy of the mft record @m. */
- kmirr = page_address(page) + page_ofs;
+ kmirr = page_address(page) + ((ni->mft_no << vol->mft_record_size_bits)
+ & ~PAGE_CACHE_MASK);
/* Copy the mst protected mft record to the mirror. */
memcpy(kmirr, m, vol->mft_record_size);
- /* Create uptodate buffers if not present. */
- if (unlikely(!page_has_buffers(page))) {
- struct buffer_head *tail;
-
- bh = head = alloc_page_buffers(page, blocksize, 1);
- do {
- set_buffer_uptodate(bh);
- tail = bh;
- bh = bh->b_this_page;
- } while (bh);
- tail->b_this_page = head;
- attach_page_buffers(page, head);
- BUG_ON(!page_has_buffers(page));
+ /* Make sure we have mapped buffers. */
+ if (!page_has_buffers(page)) {
+no_buffers_err_out:
+ ntfs_error(vol->sb, "Writing mft mirror records without "
+ "existing buffers is not implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ goto unlock_err_out;
}
bh = head = page_buffers(page);
- BUG_ON(!bh);
- rl = NULL;
+ if (!bh)
+ goto no_buffers_err_out;
nr_bhs = 0;
block_start = 0;
m_start = kmirr - (u8*)page_address(page);
m_end = m_start + vol->mft_record_size;
do {
block_end = block_start + blocksize;
- /* If the buffer is outside the mft record, skip it. */
- if (block_end <= m_start)
- continue;
- if (unlikely(block_start >= m_end))
- break;
- /* Need to map the buffer if it is not mapped already. */
- if (unlikely(!buffer_mapped(bh))) {
- VCN vcn;
- LCN lcn;
- unsigned int vcn_ofs;
-
- /* Obtain the vcn and offset of the current block. */
- vcn = ((VCN)mft_no << vol->mft_record_size_bits) +
- (block_start - m_start);
- vcn_ofs = vcn & vol->cluster_size_mask;
- vcn >>= vol->cluster_size_bits;
- if (!rl) {
- down_read(&NTFS_I(vol->mftmirr_ino)->
- runlist.lock);
- rl = NTFS_I(vol->mftmirr_ino)->runlist.rl;
- /*
- * $MFTMirr always has the whole of its runlist
- * in memory.
- */
- BUG_ON(!rl);
- }
- /* Seek to element containing target vcn. */
- while (rl->length && rl[1].vcn <= vcn)
- rl++;
- lcn = ntfs_rl_vcn_to_lcn(rl, vcn);
- /* For $MFTMirr, only lcn >= 0 is a successful remap. */
- if (likely(lcn >= 0)) {
- /* Setup buffer head to correct block. */
- bh->b_blocknr = ((lcn <<
- vol->cluster_size_bits) +
- vcn_ofs) >> blocksize_bits;
- set_buffer_mapped(bh);
- } else {
- bh->b_blocknr = -1;
- ntfs_error(vol->sb, "Cannot write mft mirror "
- "record 0x%lx because its "
- "location on disk could not "
- "be determined (error code "
- "%lli).", mft_no,
- (long long)lcn);
- err = -EIO;
+ /*
+ * If the buffer is outside the mft record, just skip it,
+ * clearing it if it is dirty to make sure it is not written
+ * out. It should never be marked dirty but better be safe.
+ */
+ if ((block_end <= m_start) || (block_start >= m_end)) {
+ if (buffer_dirty(bh)) {
+ ntfs_warning(vol->sb, "Clearing dirty mft "
+ "record page buffer. %s",
+ ntfs_please_email);
+ clear_buffer_dirty(bh);
}
+ continue;
+ }
+ if (!buffer_mapped(bh)) {
+ ntfs_error(vol->sb, "Writing mft mirror records "
+ "without existing mapped buffers is "
+ "not implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ continue;
+ }
+ if (!buffer_uptodate(bh)) {
+ ntfs_error(vol->sb, "Writing mft mirror records "
+ "without existing uptodate buffers is "
+ "not implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ continue;
}
- BUG_ON(!buffer_uptodate(bh));
BUG_ON(!nr_bhs && (m_start != block_start));
BUG_ON(nr_bhs >= max_bhs);
bhs[nr_bhs++] = bh;
BUG_ON((nr_bhs >= max_bhs) && (m_end != block_end));
} while (block_start = block_end, (bh = bh->b_this_page) != head);
- if (unlikely(rl))
- up_read(&NTFS_I(vol->mftmirr_ino)->runlist.lock);
if (likely(!err)) {
/* Lock buffers and start synchronous write i/o on them. */
for (i_bhs = 0; i_bhs < nr_bhs; i_bhs++) {
if (unlikely(test_set_buffer_locked(tbh)))
BUG();
BUG_ON(!buffer_uptodate(tbh));
- clear_buffer_dirty(tbh);
+ if (buffer_dirty(tbh))
+ clear_buffer_dirty(tbh);
get_bh(tbh);
tbh->b_end_io = end_buffer_write_sync;
submit_bh(WRITE, tbh);
if (unlikely(!buffer_uptodate(tbh))) {
err = -EIO;
/*
- * Set the buffer uptodate so the page and
- * buffer states do not become out of sync.
+ * Set the buffer uptodate so the page & buffer
+ * states don't become out of sync.
*/
- set_buffer_uptodate(tbh);
+ if (PageUptodate(page))
+ set_buffer_uptodate(tbh);
}
}
} else /* if (unlikely(err)) */ {
for (i_bhs = 0; i_bhs < nr_bhs; i_bhs++)
clear_buffer_dirty(bhs[i_bhs]);
}
+unlock_err_out:
/* Current state: all buffers are clean, unlocked, and uptodate. */
/* Remove the mst protection fixups again. */
post_write_mst_fixup((NTFS_RECORD*)kmirr);
flush_dcache_page(page);
- SetPageUptodate(page);
unlock_page(page);
ntfs_unmap_page(page);
- if (likely(!err)) {
- ntfs_debug("Done.");
- } else {
+ if (unlikely(err)) {
+ /* I/O error during writing. This is really bad! */
ntfs_error(vol->sb, "I/O error while writing mft mirror "
- "record 0x%lx!", mft_no);
-err_out:
- ntfs_error(vol->sb, "Failed to synchronize $MFTMirr (error "
- "code %i). Volume will be left marked dirty "
- "on umount. Run ntfsfix on the partition "
- "after umounting to correct this.", -err);
- NVolSetErrors(vol);
+ "record 0x%lx! You should unmount the volume "
+ "and run chkdsk or ntfsfix.", ni->mft_no);
+ goto err_out;
}
+ ntfs_debug("Done.");
+ return 0;
+err_out:
+ ntfs_error(vol->sb, "Failed to synchronize $MFTMirr (error code %i). "
+ "Volume will be left marked dirty on umount. Run "
+ "ntfsfix on the partition after umounting to correct "
+ "this.", -err);
+ /* We don't want to clear the dirty bit on umount. */
+ NVolSetErrors(vol);
return err;
}
* ntfs inode @ni to backing store. If the mft record @m has a counterpart in
* the mft mirror, that is also updated.
*
- * We only write the mft record if the ntfs inode @ni is dirty and the first
- * buffer belonging to its mft record is dirty, too. We ignore the dirty state
- * of subsequent buffers because we could have raced with
- * fs/ntfs/aops.c::mark_ntfs_record_dirty().
- *
* On success, clean the mft record and return 0. On error, leave the mft
* record dirty and return -errno. The caller should call make_bad_inode() on
* the base inode to ensure no more access happens to this inode. We do not do
{
ntfs_volume *vol = ni->vol;
struct page *page = ni->page;
- unsigned char blocksize_bits = vol->mft_ino->i_blkbits;
- unsigned int blocksize = 1 << blocksize_bits;
+ unsigned int blocksize = vol->sb->s_blocksize;
int max_bhs = vol->mft_record_size / blocksize;
struct buffer_head *bhs[max_bhs];
struct buffer_head *bh, *head;
- runlist_element *rl;
unsigned int block_start, block_end, m_start, m_end;
int i_bhs, nr_bhs, err = 0;
*/
if (!NInoTestClearDirty(ni))
goto done;
- BUG_ON(!page_has_buffers(page));
+ /* Make sure we have mapped buffers. */
+ if (!page_has_buffers(page)) {
+no_buffers_err_out:
+ ntfs_error(vol->sb, "Writing mft records without existing "
+ "buffers is not implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ goto err_out;
+ }
bh = head = page_buffers(page);
- BUG_ON(!bh);
- rl = NULL;
+ if (!bh)
+ goto no_buffers_err_out;
nr_bhs = 0;
block_start = 0;
m_start = ni->page_ofs;
m_end = m_start + vol->mft_record_size;
do {
block_end = block_start + blocksize;
- /* If the buffer is outside the mft record, skip it. */
- if (block_end <= m_start)
- continue;
- if (unlikely(block_start >= m_end))
- break;
/*
- * If this block is not the first one in the record, we ignore
- * the buffer's dirty state because we could have raced with a
- * parallel mark_ntfs_record_dirty().
+ * If the buffer is outside the mft record, just skip it,
+ * clearing it if it is dirty to make sure it is not written
+ * out. It should never be marked dirty but better be safe.
*/
- if (block_start == m_start) {
- /* This block is the first one in the record. */
- if (!buffer_dirty(bh)) {
- BUG_ON(nr_bhs);
- /* Clean records are not written out. */
- break;
+ if ((block_end <= m_start) || (block_start >= m_end)) {
+ if (buffer_dirty(bh)) {
+ ntfs_warning(vol->sb, "Clearing dirty mft "
+ "record page buffer. %s",
+ ntfs_please_email);
+ clear_buffer_dirty(bh);
}
+ continue;
}
- /* Need to map the buffer if it is not mapped already. */
- if (unlikely(!buffer_mapped(bh))) {
- VCN vcn;
- LCN lcn;
- unsigned int vcn_ofs;
-
- /* Obtain the vcn and offset of the current block. */
- vcn = ((VCN)ni->mft_no << vol->mft_record_size_bits) +
- (block_start - m_start);
- vcn_ofs = vcn & vol->cluster_size_mask;
- vcn >>= vol->cluster_size_bits;
- if (!rl) {
- down_read(&NTFS_I(vol->mft_ino)->runlist.lock);
- rl = NTFS_I(vol->mft_ino)->runlist.rl;
- BUG_ON(!rl);
- }
- /* Seek to element containing target vcn. */
- while (rl->length && rl[1].vcn <= vcn)
- rl++;
- lcn = ntfs_rl_vcn_to_lcn(rl, vcn);
- /* For $MFT, only lcn >= 0 is a successful remap. */
- if (likely(lcn >= 0)) {
- /* Setup buffer head to correct block. */
- bh->b_blocknr = ((lcn <<
- vol->cluster_size_bits) +
- vcn_ofs) >> blocksize_bits;
- set_buffer_mapped(bh);
- } else {
- bh->b_blocknr = -1;
- ntfs_error(vol->sb, "Cannot write mft record "
- "0x%lx because its location "
- "on disk could not be "
- "determined (error code %lli).",
- ni->mft_no, (long long)lcn);
- err = -EIO;
- }
+ if (!buffer_mapped(bh)) {
+ ntfs_error(vol->sb, "Writing mft records without "
+ "existing mapped buffers is not "
+ "implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ continue;
+ }
+ if (!buffer_uptodate(bh)) {
+ ntfs_error(vol->sb, "Writing mft records without "
+ "existing uptodate buffers is not "
+ "implemented yet. %s",
+ ntfs_please_email);
+ err = -EOPNOTSUPP;
+ continue;
}
- BUG_ON(!buffer_uptodate(bh));
BUG_ON(!nr_bhs && (m_start != block_start));
BUG_ON(nr_bhs >= max_bhs);
bhs[nr_bhs++] = bh;
BUG_ON((nr_bhs >= max_bhs) && (m_end != block_end));
} while (block_start = block_end, (bh = bh->b_this_page) != head);
- if (unlikely(rl))
- up_read(&NTFS_I(vol->mft_ino)->runlist.lock);
- if (!nr_bhs)
- goto done;
if (unlikely(err))
goto cleanup_out;
/* Apply the mst protection fixups. */
if (unlikely(test_set_buffer_locked(tbh)))
BUG();
BUG_ON(!buffer_uptodate(tbh));
- clear_buffer_dirty(tbh);
+ if (buffer_dirty(tbh))
+ clear_buffer_dirty(tbh);
get_bh(tbh);
tbh->b_end_io = end_buffer_write_sync;
submit_bh(WRITE, tbh);
}
/* Synchronize the mft mirror now if not @sync. */
if (!sync && ni->mft_no < vol->mftmirr_size)
- ntfs_sync_mft_mirror(vol, ni->mft_no, m, sync);
+ sync_mft_mirror(ni, m, sync);
/* Wait on i/o completion of buffers. */
for (i_bhs = 0; i_bhs < nr_bhs; i_bhs++) {
struct buffer_head *tbh = bhs[i_bhs];
if (unlikely(!buffer_uptodate(tbh))) {
err = -EIO;
/*
- * Set the buffer uptodate so the page and buffer
- * states do not become out of sync.
+ * Set the buffer uptodate so the page & buffer states
+ * don't become out of sync.
*/
if (PageUptodate(page))
set_buffer_uptodate(tbh);
}
/* If @sync, now synchronize the mft mirror. */
if (sync && ni->mft_no < vol->mftmirr_size)
- ntfs_sync_mft_mirror(vol, ni->mft_no, m, sync);
+ sync_mft_mirror(ni, m, sync);
/* Remove the mst protection fixups again. */
post_write_mst_fixup((NTFS_RECORD*)m);
flush_dcache_mft_record_page(ni);
"Redirtying so the write is retried later.");
mark_mft_record_dirty(ni);
err = 0;
- } else
- NVolSetErrors(vol);
+ }
return err;
}
/**
- * ntfs_may_write_mft_record - check if an mft record may be written out
- * @vol: [IN] ntfs volume on which the mft record to check resides
- * @mft_no: [IN] mft record number of the mft record to check
- * @m: [IN] mapped mft record to check
- * @locked_ni: [OUT] caller has to unlock this ntfs inode if one is returned
- *
- * Check if the mapped (base or extent) mft record @m with mft record number
- * @mft_no belonging to the ntfs volume @vol may be written out. If necessary
- * and possible the ntfs inode of the mft record is locked and the base vfs
- * inode is pinned. The locked ntfs inode is then returned in @locked_ni. The
- * caller is responsible for unlocking the ntfs inode and unpinning the base
- * vfs inode.
- *
- * Return TRUE if the mft record may be written out and FALSE if not.
- *
- * The caller has locked the page and cleared the uptodate flag on it which
- * means that we can safely write out any dirty mft records that do not have
- * their inodes in icache as determined by ilookup5() as anyone
- * opening/creating such an inode would block when attempting to map the mft
- * record in read_cache_page() until we are finished with the write out.
- *
- * Here is a description of the tests we perform:
- *
- * If the inode is found in icache we know the mft record must be a base mft
- * record. If it is dirty, we do not write it and return FALSE as the vfs
- * inode write paths will result in the access times being updated which would
- * cause the base mft record to be redirtied and written out again. (We know
- * the access time update will modify the base mft record because Windows
- * chkdsk complains if the standard information attribute is not in the base
- * mft record.)
- *
- * If the inode is in icache and not dirty, we attempt to lock the mft record
- * and if we find the lock was already taken, it is not safe to write the mft
- * record and we return FALSE.
- *
- * If we manage to obtain the lock we have exclusive access to the mft record,
- * which also allows us safe writeout of the mft record. We then set
- * @locked_ni to the locked ntfs inode and return TRUE.
- *
- * Note we cannot just lock the mft record and sleep while waiting for the lock
- * because this would deadlock due to lock reversal (normally the mft record is
- * locked before the page is locked but we already have the page locked here
- * when we try to lock the mft record).
- *
- * If the inode is not in icache we need to perform further checks.
- *
- * If the mft record is not a FILE record or it is a base mft record, we can
- * safely write it and return TRUE.
- *
- * We now know the mft record is an extent mft record. We check if the inode
- * corresponding to its base mft record is in icache and obtain a reference to
- * it if it is. If it is not, we can safely write it and return TRUE.
- *
- * We now have the base inode for the extent mft record. We check if it has an
- * ntfs inode for the extent mft record attached and if not it is safe to write
- * the extent mft record and we return TRUE.
- *
- * The ntfs inode for the extent mft record is attached to the base inode so we
- * attempt to lock the extent mft record and if we find the lock was already
- * taken, it is not safe to write the extent mft record and we return FALSE.
- *
- * If we manage to obtain the lock we have exclusive access to the extent mft
- * record, which also allows us safe writeout of the extent mft record. We
- * set the ntfs inode of the extent mft record clean and then set @locked_ni to
- * the now locked ntfs inode and return TRUE.
- *
- * Note, the reason for actually writing dirty mft records here and not just
- * relying on the vfs inode dirty code paths is that we can have mft records
- * modified without them ever having actual inodes in memory. Also we can have
- * dirty mft records with clean ntfs inodes in memory. None of the described
- * cases would result in the dirty mft records being written out if we only
- * relied on the vfs inode dirty code paths. And these cases can really occur
- * during allocation of new mft records and in particular when the
- * initialized_size of the $MFT/$DATA attribute is extended and the new space
- * is initialized using ntfs_mft_record_format(). The clean inode can then
- * appear if the mft record is reused for a new inode before it got written
- * out.
+ * ntfs_mft_writepage - check if a metadata page contains dirty mft records
+ * @page: metadata page possibly containing dirty mft records
+ * @wbc: writeback control structure
+ *
+ * This is called from the VM when it wants to have a dirty $MFT/$DATA metadata
+ * page cache page cleaned. The VM has already locked the page and marked it
+ * clean. Instead of writing the page as a conventional ->writepage function
+ * would do, we check if the page still contains any dirty mft records (it must
+ * have done at some point in the past since the page was marked dirty) and if
+ * none are found, i.e. all mft records are clean, we unlock the page and
+ * return. The VM is then free to do with the page as it pleases. If on the
+ * other hand we do find any dirty mft records in the page, we redirty the page
+ * before unlocking it and returning so the VM knows that the page is still
+ * busy and cannot be thrown out.
+ *
+ * Note, we do not actually write any dirty mft records here because they are
+ * dirty inodes and hence will be written by the VFS inode dirty code paths.
+ * There is no need to write them from the VM page dirty code paths, too and in
+ * fact once we implement journalling it would be a complete nightmare having
+ * two code paths leading to mft record writeout.
*/
-BOOL ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
- const MFT_RECORD *m, ntfs_inode **locked_ni)
+static int ntfs_mft_writepage(struct page *page, struct writeback_control *wbc)
{
- struct super_block *sb = vol->sb;
- struct inode *mft_vi = vol->mft_ino;
- struct inode *vi;
- ntfs_inode *ni, *eni, **extent_nis;
- int i;
- ntfs_attr na;
+ struct inode *mft_vi = page->mapping->host;
+ struct super_block *sb = mft_vi->i_sb;
+ ntfs_volume *vol = NTFS_SB(sb);
+ u8 *maddr;
+ MFT_RECORD *m;
+ ntfs_inode **extent_nis;
+ unsigned long mft_no;
+ int nr, i, j;
+ BOOL is_dirty = FALSE;
- ntfs_debug("Entering for inode 0x%lx.", mft_no);
- /*
- * Normally we do not return a locked inode so set @locked_ni to NULL.
- */
- BUG_ON(!locked_ni);
- *locked_ni = NULL;
- /*
- * Check if the inode corresponding to this mft record is in the VFS
- * inode cache and obtain a reference to it if it is.
- */
- ntfs_debug("Looking for inode 0x%lx in icache.", mft_no);
- na.mft_no = mft_no;
- na.name = NULL;
- na.name_len = 0;
- na.type = AT_UNUSED;
- /*
- * For inode 0, i.e. $MFT itself, we cannot use ilookup5() from here or
- * we deadlock because the inode is already locked by the kernel
- * (fs/fs-writeback.c::__sync_single_inode()) and ilookup5() waits
- * until the inode is unlocked before returning it and it never gets
- * unlocked because ntfs_should_write_mft_record() never returns. )-:
- * Fortunately, we have inode 0 pinned in icache for the duration of
- * the mount so we can access it directly.
- */
- if (!mft_no) {
- /* Balance the below iput(). */
- vi = igrab(mft_vi);
- BUG_ON(vi != mft_vi);
- } else
- vi = ilookup5(sb, mft_no, (test_t)ntfs_test_inode, &na);
- if (vi) {
- ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
- /* The inode is in icache. */
- ni = NTFS_I(vi);
- /* Take a reference to the ntfs inode. */
- atomic_inc(&ni->count);
- /* If the inode is dirty, do not write this record. */
- if (NInoDirty(ni)) {
- ntfs_debug("Inode 0x%lx is dirty, do not write it.",
+ BUG_ON(!PageLocked(page));
+ BUG_ON(PageWriteback(page));
+ BUG_ON(mft_vi != vol->mft_ino);
+ /* The first mft record number in the page. */
+ mft_no = page->index << (PAGE_CACHE_SHIFT - vol->mft_record_size_bits);
+ /* Number of mft records in the page. */
+ nr = PAGE_CACHE_SIZE >> vol->mft_record_size_bits;
+ BUG_ON(!nr);
+ ntfs_debug("Entering for %i inodes starting at 0x%lx.", nr, mft_no);
+ /* Iterate over the mft records in the page looking for a dirty one. */
+ maddr = (u8*)kmap(page);
+ for (i = 0; i < nr; ++i, ++mft_no, maddr += vol->mft_record_size) {
+ struct inode *vi;
+ ntfs_inode *ni, *eni;
+ ntfs_attr na;
+
+ na.mft_no = mft_no;
+ na.name = NULL;
+ na.name_len = 0;
+ na.type = AT_UNUSED;
+ /*
+ * Check if the inode corresponding to this mft record is in
+ * the VFS inode cache and obtain a reference to it if it is.
+ */
+ ntfs_debug("Looking for inode 0x%lx in icache.", mft_no);
+ /*
+ * For inode 0, i.e. $MFT itself, we cannot use ilookup5() from
+ * here or we deadlock because the inode is already locked by
+ * the kernel (fs/fs-writeback.c::__sync_single_inode()) and
+ * ilookup5() waits until the inode is unlocked before
+ * returning it and it never gets unlocked because
+ * ntfs_mft_writepage() never returns. )-: Fortunately, we
+ * have inode 0 pinned in icache for the duration of the mount
+ * so we can access it directly.
+ */
+ if (!mft_no) {
+ /* Balance the below iput(). */
+ vi = igrab(mft_vi);
+ BUG_ON(vi != mft_vi);
+ } else
+ vi = ilookup5(sb, mft_no, (test_t)ntfs_test_inode, &na);
+ if (vi) {
+ ntfs_debug("Inode 0x%lx is in icache.", mft_no);
+ /* The inode is in icache. Check if it is dirty. */
+ ni = NTFS_I(vi);
+ if (!NInoDirty(ni)) {
+ /* The inode is not dirty, skip this record. */
+ ntfs_debug("Inode 0x%lx is not dirty, "
+ "continuing search.", mft_no);
+ iput(vi);
+ continue;
+ }
+ ntfs_debug("Inode 0x%lx is dirty, aborting search.",
mft_no);
- atomic_dec(&ni->count);
+ /* The inode is dirty, no need to search further. */
iput(vi);
- return FALSE;
+ is_dirty = TRUE;
+ break;
}
- ntfs_debug("Inode 0x%lx is not dirty.", mft_no);
- /* The inode is not dirty, try to take the mft record lock. */
- if (unlikely(down_trylock(&ni->mrec_lock))) {
- ntfs_debug("Mft record 0x%lx is already locked, do "
- "not write it.", mft_no);
- atomic_dec(&ni->count);
- iput(vi);
- return FALSE;
+ ntfs_debug("Inode 0x%lx is not in icache.", mft_no);
+ /* The inode is not in icache. */
+ /* Skip the record if it is not a mft record (type "FILE"). */
+ if (!ntfs_is_mft_recordp((le32*)maddr)) {
+ ntfs_debug("Mft record 0x%lx is not a FILE record, "
+ "continuing search.", mft_no);
+ continue;
}
- ntfs_debug("Managed to lock mft record 0x%lx, write it.",
- mft_no);
- /*
- * The write has to occur while we hold the mft record lock so
- * return the locked ntfs inode.
- */
- *locked_ni = ni;
- return TRUE;
- }
- ntfs_debug("Inode 0x%lx is not in icache.", mft_no);
- /* The inode is not in icache. */
- /* Write the record if it is not a mft record (type "FILE"). */
- if (!ntfs_is_mft_record(m->magic)) {
- ntfs_debug("Mft record 0x%lx is not a FILE record, write it.",
- mft_no);
- return TRUE;
- }
- /* Write the mft record if it is a base inode. */
- if (!m->base_mft_record) {
- ntfs_debug("Mft record 0x%lx is a base record, write it.",
- mft_no);
- return TRUE;
- }
- /*
- * This is an extent mft record. Check if the inode corresponding to
- * its base mft record is in icache and obtain a reference to it if it
- * is.
- */
- na.mft_no = MREF_LE(m->base_mft_record);
- ntfs_debug("Mft record 0x%lx is an extent record. Looking for base "
- "inode 0x%lx in icache.", mft_no, na.mft_no);
- vi = ilookup5(sb, na.mft_no, (test_t)ntfs_test_inode, &na);
- if (!vi) {
+ m = (MFT_RECORD*)maddr;
/*
- * The base inode is not in icache, write this extent mft
- * record.
+ * Skip the mft record if it is not in use. FIXME: What about
+ * deleted/deallocated (extent) inodes? (AIA)
*/
- ntfs_debug("Base inode 0x%lx is not in icache, write the "
- "extent record.", na.mft_no);
- return TRUE;
- }
- ntfs_debug("Base inode 0x%lx is in icache.", na.mft_no);
- /*
- * The base inode is in icache. Check if it has the extent inode
- * corresponding to this extent mft record attached.
- */
- ni = NTFS_I(vi);
- down(&ni->extent_lock);
- if (ni->nr_extents <= 0) {
+ if (!(m->flags & MFT_RECORD_IN_USE)) {
+ ntfs_debug("Mft record 0x%lx is not in use, "
+ "continuing search.", mft_no);
+ continue;
+ }
+ /* Skip the mft record if it is a base inode. */
+ if (!m->base_mft_record) {
+ ntfs_debug("Mft record 0x%lx is a base record, "
+ "continuing search.", mft_no);
+ continue;
+ }
/*
- * The base inode has no attached extent inodes, write this
- * extent mft record.
+ * This is an extent mft record. Check if the inode
+ * corresponding to its base mft record is in icache.
*/
- up(&ni->extent_lock);
- iput(vi);
- ntfs_debug("Base inode 0x%lx has no attached extent inodes, "
- "write the extent record.", na.mft_no);
- return TRUE;
- }
- /* Iterate over the attached extent inodes. */
- extent_nis = ni->ext.extent_ntfs_inos;
- for (eni = NULL, i = 0; i < ni->nr_extents; ++i) {
- if (mft_no == extent_nis[i]->mft_no) {
+ na.mft_no = MREF_LE(m->base_mft_record);
+ ntfs_debug("Mft record 0x%lx is an extent record. Looking "
+ "for base inode 0x%lx in icache.", mft_no,
+ na.mft_no);
+ vi = ilookup5(sb, na.mft_no, (test_t)ntfs_test_inode,
+ &na);
+ if (!vi) {
/*
- * Found the extent inode corresponding to this extent
+ * The base inode is not in icache. Skip this extent
* mft record.
*/
- eni = extent_nis[i];
- break;
+ ntfs_debug("Base inode 0x%lx is not in icache, "
+ "continuing search.", na.mft_no);
+ continue;
}
- }
- /*
- * If the extent inode was not attached to the base inode, write this
- * extent mft record.
- */
- if (!eni) {
- up(&ni->extent_lock);
- iput(vi);
- ntfs_debug("Extent inode 0x%lx is not attached to its base "
- "inode 0x%lx, write the extent record.",
- mft_no, na.mft_no);
- return TRUE;
- }
- ntfs_debug("Extent inode 0x%lx is attached to its base inode 0x%lx.",
- mft_no, na.mft_no);
- /* Take a reference to the extent ntfs inode. */
- atomic_inc(&eni->count);
- up(&ni->extent_lock);
- /*
- * Found the extent inode coresponding to this extent mft record.
- * Try to take the mft record lock.
- */
- if (unlikely(down_trylock(&eni->mrec_lock))) {
- atomic_dec(&eni->count);
- iput(vi);
- ntfs_debug("Extent mft record 0x%lx is already locked, do "
- "not write it.", mft_no);
- return FALSE;
- }
- ntfs_debug("Managed to lock extent mft record 0x%lx, write it.",
- mft_no);
- if (NInoTestClearDirty(eni))
- ntfs_debug("Extent inode 0x%lx is dirty, marking it clean.",
- mft_no);
- /*
- * The write has to occur while we hold the mft record lock so return
- * the locked extent ntfs inode.
- */
- *locked_ni = eni;
- return TRUE;
-}
-
-static const char *es = " Leaving inconsistent metadata. Unmount and run "
- "chkdsk.";
-
-/**
- * ntfs_mft_bitmap_find_and_alloc_free_rec_nolock - see name
- * @vol: volume on which to search for a free mft record
- * @base_ni: open base inode if allocating an extent mft record or NULL
- *
- * Search for a free mft record in the mft bitmap attribute on the ntfs volume
- * @vol.
- *
- * If @base_ni is NULL start the search at the default allocator position.
- *
- * If @base_ni is not NULL start the search at the mft record after the base
- * mft record @base_ni.
- *
- * Return the free mft record on success and -errno on error. An error code of
- * -ENOSPC means that there are no free mft records in the currently
- * initialized mft bitmap.
- *
- * Locking: Caller must hold vol->mftbmp_lock for writing.
- */
-static int ntfs_mft_bitmap_find_and_alloc_free_rec_nolock(ntfs_volume *vol,
- ntfs_inode *base_ni)
-{
- s64 pass_end, ll, data_pos, pass_start, ofs, bit;
- struct address_space *mftbmp_mapping;
- u8 *buf, *byte;
- struct page *page;
- unsigned int page_ofs, size;
- u8 pass, b;
-
- ntfs_debug("Searching for free mft record in the currently "
- "initialized mft bitmap.");
- mftbmp_mapping = vol->mftbmp_ino->i_mapping;
- /*
- * Set the end of the pass making sure we do not overflow the mft
- * bitmap.
- */
- pass_end = NTFS_I(vol->mft_ino)->allocated_size >>
- vol->mft_record_size_bits;
- ll = NTFS_I(vol->mftbmp_ino)->initialized_size << 3;
- if (pass_end > ll)
- pass_end = ll;
- pass = 1;
- if (!base_ni)
- data_pos = vol->mft_data_pos;
- else
- data_pos = base_ni->mft_no + 1;
- if (data_pos < 24)
- data_pos = 24;
- if (data_pos >= pass_end) {
- data_pos = 24;
- pass = 2;
- /* This happens on a freshly formatted volume. */
- if (data_pos >= pass_end)
- return -ENOSPC;
- }
- pass_start = data_pos;
- ntfs_debug("Starting bitmap search: pass %u, pass_start 0x%llx, "
- "pass_end 0x%llx, data_pos 0x%llx.", pass,
- (long long)pass_start, (long long)pass_end,
- (long long)data_pos);
- /* Loop until a free mft record is found. */
- for (; pass <= 2;) {
- /* Cap size to pass_end. */
- ofs = data_pos >> 3;
- page_ofs = ofs & ~PAGE_CACHE_MASK;
- size = PAGE_CACHE_SIZE - page_ofs;
- ll = ((pass_end + 7) >> 3) - ofs;
- if (size > ll)
- size = ll;
- size <<= 3;
+ ntfs_debug("Base inode 0x%lx is in icache.", na.mft_no);
/*
- * If we are still within the active pass, search the next page
- * for a zero bit.
+ * The base inode is in icache. Check if it has the extent
+ * inode corresponding to this extent mft record attached.
*/
- if (size) {
- page = ntfs_map_page(mftbmp_mapping,
- ofs >> PAGE_CACHE_SHIFT);
- if (unlikely(IS_ERR(page))) {
- ntfs_error(vol->sb, "Failed to read mft "
- "bitmap, aborting.");
- return PTR_ERR(page);
- }
- buf = (u8*)page_address(page) + page_ofs;
- bit = data_pos & 7;
- data_pos &= ~7ull;
- ntfs_debug("Before inner for loop: size 0x%x, "
- "data_pos 0x%llx, bit 0x%llx", size,
- (long long)data_pos, (long long)bit);
- for (; bit < size && data_pos + bit < pass_end;
- bit &= ~7ull, bit += 8) {
- byte = buf + (bit >> 3);
- if (*byte == 0xff)
- continue;
- b = ffz((unsigned long)*byte);
- if (b < 8 && b >= (bit & 7)) {
- ll = data_pos + (bit & ~7ull) + b;
- if (unlikely(ll > (1ll << 32))) {
- ntfs_unmap_page(page);
- return -ENOSPC;
- }
- *byte |= 1 << b;
- flush_dcache_page(page);
- set_page_dirty(page);
- ntfs_unmap_page(page);
- ntfs_debug("Done. (Found and "
- "allocated mft record "
- "0x%llx.)",
- (long long)ll);
- return ll;
- }
- }
- ntfs_debug("After inner for loop: size 0x%x, "
- "data_pos 0x%llx, bit 0x%llx", size,
- (long long)data_pos, (long long)bit);
- data_pos += size;
- ntfs_unmap_page(page);
+ ni = NTFS_I(vi);
+ down(&ni->extent_lock);
+ if (ni->nr_extents <= 0) {
/*
- * If the end of the pass has not been reached yet,
- * continue searching the mft bitmap for a zero bit.
+ * The base inode has no attached extent inodes. Skip
+ * this extent mft record.
*/
- if (data_pos < pass_end)
- continue;
+ up(&ni->extent_lock);
+ iput(vi);
+ continue;
}
- /* Do the next pass. */
- if (++pass == 2) {
- /*
- * Starting the second pass, in which we scan the first
- * part of the zone which we omitted earlier.
- */
- pass_end = pass_start;
- data_pos = pass_start = 24;
- ntfs_debug("pass %i, pass_start 0x%llx, pass_end "
- "0x%llx.", pass, (long long)pass_start,
- (long long)pass_end);
- if (data_pos >= pass_end)
+ /* Iterate over the attached extent inodes. */
+ extent_nis = ni->ext.extent_ntfs_inos;
+ for (eni = NULL, j = 0; j < ni->nr_extents; ++j) {
+ if (mft_no == extent_nis[j]->mft_no) {
+ /*
+ * Found the extent inode corresponding to this
+ * extent mft record.
+ */
+ eni = extent_nis[j];
break;
- }
- }
- /* No free mft records in currently initialized mft bitmap. */
- ntfs_debug("Done. (No free mft records left in currently initialized "
- "mft bitmap.)");
- return -ENOSPC;
-}
-
-/**
- * ntfs_mft_bitmap_extend_allocation_nolock - extend mft bitmap by a cluster
- * @vol: volume on which to extend the mft bitmap attribute
- *
- * Extend the mft bitmap attribute on the ntfs volume @vol by one cluster.
- *
- * Note: Only changes allocated_size, i.e. does not touch initialized_size or
- * data_size.
- *
- * Return 0 on success and -errno on error.
- *
- * Locking: - Caller must hold vol->mftbmp_lock for writing.
- * - This function takes NTFS_I(vol->mftbmp_ino)->runlist.lock for
- * writing and releases it before returning.
- * - This function takes vol->lcnbmp_lock for writing and releases it
- * before returning.
- */
-static int ntfs_mft_bitmap_extend_allocation_nolock(ntfs_volume *vol)
-{
- LCN lcn;
- s64 ll;
- struct page *page;
- ntfs_inode *mft_ni, *mftbmp_ni;
- runlist_element *rl, *rl2 = NULL;
- ntfs_attr_search_ctx *ctx = NULL;
- MFT_RECORD *mrec;
- ATTR_RECORD *a = NULL;
- int ret, mp_size;
- u32 old_alen = 0;
- u8 *b, tb;
- struct {
- u8 added_cluster:1;
- u8 added_run:1;
- u8 mp_rebuilt:1;
- } status = { 0, 0, 0 };
-
- ntfs_debug("Extending mft bitmap allocation.");
- mft_ni = NTFS_I(vol->mft_ino);
- mftbmp_ni = NTFS_I(vol->mftbmp_ino);
- /*
- * Determine the last lcn of the mft bitmap. The allocated size of the
- * mft bitmap cannot be zero so we are ok to do this.
- * ntfs_find_vcn() returns the runlist locked on success.
- */
- rl = ntfs_find_vcn(mftbmp_ni, (mftbmp_ni->allocated_size - 1) >>
- vol->cluster_size_bits, TRUE);
- if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
- ntfs_error(vol->sb, "Failed to determine last allocated "
- "cluster of mft bitmap attribute.");
- if (!IS_ERR(rl)) {
- up_write(&mftbmp_ni->runlist.lock);
- ret = -EIO;
- } else
- ret = PTR_ERR(rl);
- return ret;
- }
- lcn = rl->lcn + rl->length;
- ntfs_debug("Last lcn of mft bitmap attribute is 0x%llx.",
- (long long)lcn);
- /*
- * Attempt to get the cluster following the last allocated cluster by
- * hand as it may be in the MFT zone so the allocator would not give it
- * to us.
- */
- ll = lcn >> 3;
- page = ntfs_map_page(vol->lcnbmp_ino->i_mapping,
- ll >> PAGE_CACHE_SHIFT);
- if (IS_ERR(page)) {
- up_write(&mftbmp_ni->runlist.lock);
- ntfs_error(vol->sb, "Failed to read from lcn bitmap.");
- return PTR_ERR(page);
- }
- b = (u8*)page_address(page) + (ll & ~PAGE_CACHE_MASK);
- tb = 1 << (lcn & 7ull);
- down_write(&vol->lcnbmp_lock);
- if (*b != 0xff && !(*b & tb)) {
- /* Next cluster is free, allocate it. */
- *b |= tb;
- flush_dcache_page(page);
- set_page_dirty(page);
- up_write(&vol->lcnbmp_lock);
- ntfs_unmap_page(page);
- /* Update the mft bitmap runlist. */
- rl->length++;
- rl[1].vcn++;
- status.added_cluster = 1;
- ntfs_debug("Appending one cluster to mft bitmap.");
- } else {
- up_write(&vol->lcnbmp_lock);
- ntfs_unmap_page(page);
- /* Allocate a cluster from the DATA_ZONE. */
- rl2 = ntfs_cluster_alloc(vol, rl[1].vcn, 1, lcn, DATA_ZONE);
- if (IS_ERR(rl2)) {
- up_write(&mftbmp_ni->runlist.lock);
- ntfs_error(vol->sb, "Failed to allocate a cluster for "
- "the mft bitmap.");
- return PTR_ERR(rl2);
- }
- rl = ntfs_runlists_merge(mftbmp_ni->runlist.rl, rl2);
- if (IS_ERR(rl)) {
- up_write(&mftbmp_ni->runlist.lock);
- ntfs_error(vol->sb, "Failed to merge runlists for mft "
- "bitmap.");
- if (ntfs_cluster_free_from_rl(vol, rl2)) {
- ntfs_error(vol->sb, "Failed to dealocate "
- "allocated cluster.%s", es);
- NVolSetErrors(vol);
}
- ntfs_free(rl2);
- return PTR_ERR(rl);
}
- mftbmp_ni->runlist.rl = rl;
- status.added_run = 1;
- ntfs_debug("Adding one run to mft bitmap.");
- /* Find the last run in the new runlist. */
- for (; rl[1].length; rl++)
- ;
- }
- /*
- * Update the attribute record as well. Note: @rl is the last
- * (non-terminator) runlist element of mft bitmap.
- */
- mrec = map_mft_record(mft_ni);
- if (IS_ERR(mrec)) {
- ntfs_error(vol->sb, "Failed to map mft record.");
- ret = PTR_ERR(mrec);
- goto undo_alloc;
- }
- ctx = ntfs_attr_get_search_ctx(mft_ni, mrec);
- if (unlikely(!ctx)) {
- ntfs_error(vol->sb, "Failed to get search context.");
- ret = -ENOMEM;
- goto undo_alloc;
- }
- ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name,
- mftbmp_ni->name_len, CASE_SENSITIVE, rl[1].vcn, NULL,
- 0, ctx);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to find last attribute extent of "
- "mft bitmap attribute.");
- if (ret == -ENOENT)
- ret = -EIO;
- goto undo_alloc;
- }
- a = ctx->attr;
- ll = sle64_to_cpu(a->data.non_resident.lowest_vcn);
- /* Search back for the previous last allocated cluster of mft bitmap. */
- for (rl2 = rl; rl2 > mftbmp_ni->runlist.rl; rl2--) {
- if (ll >= rl2->vcn)
+ /*
+ * If the extent inode was not attached to the base inode, skip
+ * this extent mft record.
+ */
+ if (!eni) {
+ up(&ni->extent_lock);
+ iput(vi);
+ continue;
+ }
+ /*
+ * Found the extent inode corrsponding to this extent mft
+ * record. If it is dirty, no need to search further.
+ */
+ if (NInoDirty(eni)) {
+ up(&ni->extent_lock);
+ iput(vi);
+ is_dirty = TRUE;
break;
- }
- BUG_ON(ll < rl2->vcn);
- BUG_ON(ll >= rl2->vcn + rl2->length);
- /* Get the size for the new mapping pairs array for this extent. */
- mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll);
- if (unlikely(mp_size <= 0)) {
- ntfs_error(vol->sb, "Get size for mapping pairs failed for "
- "mft bitmap attribute extent.");
- ret = mp_size;
- if (!ret)
- ret = -EIO;
- goto undo_alloc;
- }
- /* Expand the attribute record if necessary. */
- old_alen = le32_to_cpu(a->length);
- ret = ntfs_attr_record_resize(ctx->mrec, a, mp_size +
- le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
- if (unlikely(ret)) {
- if (ret != -ENOSPC) {
- ntfs_error(vol->sb, "Failed to resize attribute "
- "record for mft bitmap attribute.");
- goto undo_alloc;
}
- // TODO: Deal with this by moving this extent to a new mft
- // record or by starting a new extent in a new mft record or by
- // moving other attributes out of this mft record.
- ntfs_error(vol->sb, "Not enough space in this mft record to "
- "accomodate extended mft bitmap attribute "
- "extent. Cannot handle this yet.");
- ret = -EOPNOTSUPP;
- goto undo_alloc;
- }
- status.mp_rebuilt = 1;
- /* Generate the mapping pairs array directly into the attr record. */
- ret = ntfs_mapping_pairs_build(vol, (u8*)a +
- le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
- mp_size, rl2, ll, NULL);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to build mapping pairs array for "
- "mft bitmap attribute.");
- goto undo_alloc;
+ /* The extent inode is not dirty, so do the next record. */
+ up(&ni->extent_lock);
+ iput(vi);
}
- /* Update the highest_vcn. */
- a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 1);
- /*
- * We now have extended the mft bitmap allocated_size by one cluster.
- * Reflect this in the ntfs_inode structure and the attribute record.
- */
- if (a->data.non_resident.lowest_vcn) {
+ kunmap(page);
+ /* If a dirty mft record was found, redirty the page. */
+ if (is_dirty) {
+ ntfs_debug("Inode 0x%lx is dirty. Redirtying the page "
+ "starting at inode 0x%lx.", mft_no,
+ page->index << (PAGE_CACHE_SHIFT -
+ vol->mft_record_size_bits));
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ } else {
/*
- * We are not in the first attribute extent, switch to it, but
- * first ensure the changes will make it to disk later.
+ * Keep the VM happy. This must be done otherwise the
+ * radix-tree tag PAGECACHE_TAG_DIRTY remains set even though
+ * the page is clean.
*/
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_reinit_search_ctx(ctx);
- ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name,
- mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL,
- 0, ctx);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to find first attribute "
- "extent of mft bitmap attribute.");
- goto restore_undo_alloc;
- }
- a = ctx->attr;
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ unlock_page(page);
+ end_page_writeback(page);
}
- mftbmp_ni->allocated_size += vol->cluster_size;
- a->data.non_resident.allocated_size =
- cpu_to_sle64(mftbmp_ni->allocated_size);
- /* Ensure the changes make it to disk. */
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- up_write(&mftbmp_ni->runlist.lock);
ntfs_debug("Done.");
return 0;
-restore_undo_alloc:
- ntfs_attr_reinit_search_ctx(ctx);
- if (ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name,
- mftbmp_ni->name_len, CASE_SENSITIVE, rl[1].vcn, NULL,
- 0, ctx)) {
- ntfs_error(vol->sb, "Failed to find last attribute extent of "
- "mft bitmap attribute.%s", es);
- mftbmp_ni->allocated_size += vol->cluster_size;
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- up_write(&mftbmp_ni->runlist.lock);
- /*
- * The only thing that is now wrong is ->allocated_size of the
- * base attribute extent which chkdsk should be able to fix.
- */
- NVolSetErrors(vol);
- return ret;
- }
- a = ctx->attr;
- a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 2);
-undo_alloc:
- if (status.added_cluster) {
- /* Truncate the last run in the runlist by one cluster. */
- rl->length--;
- rl[1].vcn--;
- } else if (status.added_run) {
- lcn = rl->lcn;
- /* Remove the last run from the runlist. */
- rl->lcn = rl[1].lcn;
- rl->length = 0;
- }
- /* Deallocate the cluster. */
- down_write(&vol->lcnbmp_lock);
- if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
- ntfs_error(vol->sb, "Failed to free allocated cluster.%s", es);
- NVolSetErrors(vol);
- }
- up_write(&vol->lcnbmp_lock);
- if (status.mp_rebuilt) {
- if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
- a->data.non_resident.mapping_pairs_offset),
- old_alen - le16_to_cpu(
- a->data.non_resident.mapping_pairs_offset),
- rl2, ll, NULL)) {
- ntfs_error(vol->sb, "Failed to restore mapping pairs "
- "array.%s", es);
- NVolSetErrors(vol);
- }
- if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) {
- ntfs_error(vol->sb, "Failed to restore attribute "
- "record.%s", es);
- NVolSetErrors(vol);
- }
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- }
- if (ctx)
- ntfs_attr_put_search_ctx(ctx);
- if (!IS_ERR(mrec))
- unmap_mft_record(mft_ni);
- up_write(&mftbmp_ni->runlist.lock);
- return ret;
-}
-
-/**
- * ntfs_mft_bitmap_extend_initialized_nolock - extend mftbmp initialized data
- * @vol: volume on which to extend the mft bitmap attribute
- *
- * Extend the initialized portion of the mft bitmap attribute on the ntfs
- * volume @vol by 8 bytes.
- *
- * Note: Only changes initialized_size and data_size, i.e. requires that
- * allocated_size is big enough to fit the new initialized_size.
- *
- * Return 0 on success and -error on error.
- *
- * Locking: Caller must hold vol->mftbmp_lock for writing.
- */
-static int ntfs_mft_bitmap_extend_initialized_nolock(ntfs_volume *vol)
-{
- s64 old_data_size, old_initialized_size;
- struct inode *mftbmp_vi;
- ntfs_inode *mft_ni, *mftbmp_ni;
- ntfs_attr_search_ctx *ctx;
- MFT_RECORD *mrec;
- ATTR_RECORD *a;
- int ret;
-
- ntfs_debug("Extending mft bitmap initiailized (and data) size.");
- mft_ni = NTFS_I(vol->mft_ino);
- mftbmp_vi = vol->mftbmp_ino;
- mftbmp_ni = NTFS_I(mftbmp_vi);
- /* Get the attribute record. */
- mrec = map_mft_record(mft_ni);
- if (IS_ERR(mrec)) {
- ntfs_error(vol->sb, "Failed to map mft record.");
- return PTR_ERR(mrec);
- }
- ctx = ntfs_attr_get_search_ctx(mft_ni, mrec);
- if (unlikely(!ctx)) {
- ntfs_error(vol->sb, "Failed to get search context.");
- ret = -ENOMEM;
- goto unm_err_out;
- }
- ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name,
- mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL, 0, ctx);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to find first attribute extent of "
- "mft bitmap attribute.");
- if (ret == -ENOENT)
- ret = -EIO;
- goto put_err_out;
- }
- a = ctx->attr;
- old_data_size = mftbmp_vi->i_size;
- old_initialized_size = mftbmp_ni->initialized_size;
- /*
- * We can simply update the initialized_size before filling the space
- * with zeroes because the caller is holding the mft bitmap lock for
- * writing which ensures that no one else is trying to access the data.
- */
- mftbmp_ni->initialized_size += 8;
- a->data.non_resident.initialized_size =
- cpu_to_sle64(mftbmp_ni->initialized_size);
- if (mftbmp_ni->initialized_size > mftbmp_vi->i_size) {
- mftbmp_vi->i_size = mftbmp_ni->initialized_size;
- a->data.non_resident.data_size =
- cpu_to_sle64(mftbmp_vi->i_size);
- }
- /* Ensure the changes make it to disk. */
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- /* Initialize the mft bitmap attribute value with zeroes. */
- ret = ntfs_attr_set(mftbmp_ni, old_initialized_size, 8, 0);
- if (likely(!ret)) {
- ntfs_debug("Done. (Wrote eight initialized bytes to mft "
- "bitmap.");
- return 0;
- }
- ntfs_error(vol->sb, "Failed to write to mft bitmap.");
- /* Try to recover from the error. */
- mrec = map_mft_record(mft_ni);
- if (IS_ERR(mrec)) {
- ntfs_error(vol->sb, "Failed to map mft record.%s", es);
- NVolSetErrors(vol);
- return ret;
- }
- ctx = ntfs_attr_get_search_ctx(mft_ni, mrec);
- if (unlikely(!ctx)) {
- ntfs_error(vol->sb, "Failed to get search context.%s", es);
- NVolSetErrors(vol);
- goto unm_err_out;
- }
- if (ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name,
- mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL, 0, ctx)) {
- ntfs_error(vol->sb, "Failed to find first attribute extent of "
- "mft bitmap attribute.%s", es);
- NVolSetErrors(vol);
-put_err_out:
- ntfs_attr_put_search_ctx(ctx);
-unm_err_out:
- unmap_mft_record(mft_ni);
- goto err_out;
- }
- a = ctx->attr;
- mftbmp_ni->initialized_size = old_initialized_size;
- a->data.non_resident.initialized_size =
- cpu_to_sle64(old_initialized_size);
- if (mftbmp_vi->i_size != old_data_size) {
- mftbmp_vi->i_size = old_data_size;
- a->data.non_resident.data_size = cpu_to_sle64(old_data_size);
- }
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- ntfs_debug("Restored status of mftbmp: allocated_size 0x%llx, "
- "data_size 0x%llx, initialized_size 0x%llx.",
- (long long)mftbmp_ni->allocated_size,
- (long long)mftbmp_vi->i_size,
- (long long)mftbmp_ni->initialized_size);
-err_out:
- return ret;
-}
-
-/**
- * ntfs_mft_data_extend_allocation_nolock - extend mft data attribute
- * @vol: volume on which to extend the mft data attribute
- *
- * Extend the mft data attribute on the ntfs volume @vol by 16 mft records
- * worth of clusters or if not enough space for this by one mft record worth
- * of clusters.
- *
- * Note: Only changes allocated_size, i.e. does not touch initialized_size or
- * data_size.
- *
- * Return 0 on success and -errno on error.
- *
- * Locking: - Caller must hold vol->mftbmp_lock for writing.
- * - This function takes NTFS_I(vol->mft_ino)->runlist.lock for
- * writing and releases it before returning.
- * - This function calls functions which take vol->lcnbmp_lock for
- * writing and release it before returning.
- */
-static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol)
-{
- LCN lcn;
- VCN old_last_vcn;
- s64 min_nr, nr, ll = 0;
- ntfs_inode *mft_ni;
- runlist_element *rl, *rl2;
- ntfs_attr_search_ctx *ctx = NULL;
- MFT_RECORD *mrec;
- ATTR_RECORD *a = NULL;
- int ret, mp_size;
- u32 old_alen = 0;
- BOOL mp_rebuilt = FALSE;
-
- ntfs_debug("Extending mft data allocation.");
- mft_ni = NTFS_I(vol->mft_ino);
- /*
- * Determine the preferred allocation location, i.e. the last lcn of
- * the mft data attribute. The allocated size of the mft data
- * attribute cannot be zero so we are ok to do this.
- * ntfs_find_vcn() returns the runlist locked on success.
- */
- rl = ntfs_find_vcn(mft_ni, (mft_ni->allocated_size - 1) >>
- vol->cluster_size_bits, TRUE);
- if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
- ntfs_error(vol->sb, "Failed to determine last allocated "
- "cluster of mft data attribute.");
- if (!IS_ERR(rl)) {
- up_write(&mft_ni->runlist.lock);
- ret = -EIO;
- } else
- ret = PTR_ERR(rl);
- return ret;
- }
- lcn = rl->lcn + rl->length;
- ntfs_debug("Last lcn of mft data attribute is 0x%llx.",
- (long long)lcn);
- /* Minimum allocation is one mft record worth of clusters. */
- min_nr = vol->mft_record_size >> vol->cluster_size_bits;
- if (!min_nr)
- min_nr = 1;
- /* Want to allocate 16 mft records worth of clusters. */
- nr = vol->mft_record_size << 4 >> vol->cluster_size_bits;
- if (!nr)
- nr = min_nr;
- /* Ensure we do not go above 2^32-1 mft records. */
- if (unlikely((mft_ni->allocated_size +
- (nr << vol->cluster_size_bits)) >>
- vol->mft_record_size_bits >= (1ll << 32))) {
- nr = min_nr;
- if (unlikely((mft_ni->allocated_size +
- (nr << vol->cluster_size_bits)) >>
- vol->mft_record_size_bits >= (1ll << 32))) {
- ntfs_warning(vol->sb, "Cannot allocate mft record "
- "because the maximum number of inodes "
- "(2^32) has already been reached.");
- up_write(&mft_ni->runlist.lock);
- return -ENOSPC;
- }
- }
- ntfs_debug("Trying mft data allocation with %s cluster count %lli.",
- nr > min_nr ? "default" : "minimal", (long long)nr);
- old_last_vcn = rl[1].vcn;
- do {
- rl2 = ntfs_cluster_alloc(vol, old_last_vcn, nr, lcn, MFT_ZONE);
- if (likely(!IS_ERR(rl2)))
- break;
- if (PTR_ERR(rl2) != -ENOSPC || nr == min_nr) {
- ntfs_error(vol->sb, "Failed to allocate the minimal "
- "number of clusters (%lli) for the "
- "mft data attribute.", (long long)nr);
- up_write(&mft_ni->runlist.lock);
- return PTR_ERR(rl2);
- }
- /*
- * There is not enough space to do the allocation, but there
- * might be enough space to do a minimal allocation so try that
- * before failing.
- */
- nr = min_nr;
- ntfs_debug("Retrying mft data allocation with minimal cluster "
- "count %lli.", (long long)nr);
- } while (1);
- rl = ntfs_runlists_merge(mft_ni->runlist.rl, rl2);
- if (IS_ERR(rl)) {
- up_write(&mft_ni->runlist.lock);
- ntfs_error(vol->sb, "Failed to merge runlists for mft data "
- "attribute.");
- if (ntfs_cluster_free_from_rl(vol, rl2)) {
- ntfs_error(vol->sb, "Failed to dealocate clusters "
- "from the mft data attribute.%s", es);
- NVolSetErrors(vol);
- }
- ntfs_free(rl2);
- return PTR_ERR(rl);
- }
- mft_ni->runlist.rl = rl;
- ntfs_debug("Allocated %lli clusters.", nr);
- /* Find the last run in the new runlist. */
- for (; rl[1].length; rl++)
- ;
- /* Update the attribute record as well. */
- mrec = map_mft_record(mft_ni);
- if (IS_ERR(mrec)) {
- ntfs_error(vol->sb, "Failed to map mft record.");
- ret = PTR_ERR(mrec);
- goto undo_alloc;
- }
- ctx = ntfs_attr_get_search_ctx(mft_ni, mrec);
- if (unlikely(!ctx)) {
- ntfs_error(vol->sb, "Failed to get search context.");
- ret = -ENOMEM;
- goto undo_alloc;
- }
- ret = ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len,
- CASE_SENSITIVE, rl[1].vcn, NULL, 0, ctx);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to find last attribute extent of "
- "mft data attribute.");
- if (ret == -ENOENT)
- ret = -EIO;
- goto undo_alloc;
- }
- a = ctx->attr;
- ll = sle64_to_cpu(a->data.non_resident.lowest_vcn);
- /* Search back for the previous last allocated cluster of mft bitmap. */
- for (rl2 = rl; rl2 > mft_ni->runlist.rl; rl2--) {
- if (ll >= rl2->vcn)
- break;
- }
- BUG_ON(ll < rl2->vcn);
- BUG_ON(ll >= rl2->vcn + rl2->length);
- /* Get the size for the new mapping pairs array for this extent. */
- mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll);
- if (unlikely(mp_size <= 0)) {
- ntfs_error(vol->sb, "Get size for mapping pairs failed for "
- "mft data attribute extent.");
- ret = mp_size;
- if (!ret)
- ret = -EIO;
- goto undo_alloc;
- }
- /* Expand the attribute record if necessary. */
- old_alen = le32_to_cpu(a->length);
- ret = ntfs_attr_record_resize(ctx->mrec, a, mp_size +
- le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
- if (unlikely(ret)) {
- if (ret != -ENOSPC) {
- ntfs_error(vol->sb, "Failed to resize attribute "
- "record for mft data attribute.");
- goto undo_alloc;
- }
- // TODO: Deal with this by moving this extent to a new mft
- // record or by starting a new extent in a new mft record or by
- // moving other attributes out of this mft record.
- // Note: Use the special reserved mft records and ensure that
- // this extent is not required to find the mft record in
- // question.
- ntfs_error(vol->sb, "Not enough space in this mft record to "
- "accomodate extended mft data attribute "
- "extent. Cannot handle this yet.");
- ret = -EOPNOTSUPP;
- goto undo_alloc;
- }
- mp_rebuilt = TRUE;
- /* Generate the mapping pairs array directly into the attr record. */
- ret = ntfs_mapping_pairs_build(vol, (u8*)a +
- le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
- mp_size, rl2, ll, NULL);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to build mapping pairs array of "
- "mft data attribute.");
- goto undo_alloc;
- }
- /* Update the highest_vcn. */
- a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 1);
- /*
- * We now have extended the mft data allocated_size by nr clusters.
- * Reflect this in the ntfs_inode structure and the attribute record.
- * @rl is the last (non-terminator) runlist element of mft data
- * attribute.
- */
- if (a->data.non_resident.lowest_vcn) {
- /*
- * We are not in the first attribute extent, switch to it, but
- * first ensure the changes will make it to disk later.
- */
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_reinit_search_ctx(ctx);
- ret = ntfs_attr_lookup(mft_ni->type, mft_ni->name,
- mft_ni->name_len, CASE_SENSITIVE, 0, NULL, 0,
- ctx);
- if (unlikely(ret)) {
- ntfs_error(vol->sb, "Failed to find first attribute "
- "extent of mft data attribute.");
- goto restore_undo_alloc;
- }
- a = ctx->attr;
- }
- mft_ni->allocated_size += nr << vol->cluster_size_bits;
- a->data.non_resident.allocated_size =
- cpu_to_sle64(mft_ni->allocated_size);
- /* Ensure the changes make it to disk. */
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- up_write(&mft_ni->runlist.lock);
- ntfs_debug("Done.");
- return 0;
-restore_undo_alloc:
- ntfs_attr_reinit_search_ctx(ctx);
- if (ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len,
- CASE_SENSITIVE, rl[1].vcn, NULL, 0, ctx)) {
- ntfs_error(vol->sb, "Failed to find last attribute extent of "
- "mft data attribute.%s", es);
- mft_ni->allocated_size += nr << vol->cluster_size_bits;
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- up_write(&mft_ni->runlist.lock);
- /*
- * The only thing that is now wrong is ->allocated_size of the
- * base attribute extent which chkdsk should be able to fix.
- */
- NVolSetErrors(vol);
- return ret;
- }
- a = ctx->attr;
- a->data.non_resident.highest_vcn = cpu_to_sle64(old_last_vcn - 1);
-undo_alloc:
- if (ntfs_cluster_free(vol->mft_ino, old_last_vcn, -1) < 0) {
- ntfs_error(vol->sb, "Failed to free clusters from mft data "
- "attribute.%s", es);
- NVolSetErrors(vol);
- }
- if (ntfs_rl_truncate_nolock(vol, &mft_ni->runlist, old_last_vcn)) {
- ntfs_error(vol->sb, "Failed to truncate mft data attribute "
- "runlist.%s", es);
- NVolSetErrors(vol);
- }
- if (mp_rebuilt) {
- if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
- a->data.non_resident.mapping_pairs_offset),
- old_alen - le16_to_cpu(
- a->data.non_resident.mapping_pairs_offset),
- rl2, ll, NULL)) {
- ntfs_error(vol->sb, "Failed to restore mapping pairs "
- "array.%s", es);
- NVolSetErrors(vol);
- }
- if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) {
- ntfs_error(vol->sb, "Failed to restore attribute "
- "record.%s", es);
- NVolSetErrors(vol);
- }
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- }
- if (ctx)
- ntfs_attr_put_search_ctx(ctx);
- if (!IS_ERR(mrec))
- unmap_mft_record(mft_ni);
- up_write(&mft_ni->runlist.lock);
- return ret;
-}
-
-/**
- * ntfs_mft_record_layout - layout an mft record into a memory buffer
- * @vol: volume to which the mft record will belong
- * @mft_no: mft reference specifying the mft record number
- * @m: destination buffer of size >= @vol->mft_record_size bytes
- *
- * Layout an empty, unused mft record with the mft record number @mft_no into
- * the buffer @m. The volume @vol is needed because the mft record structure
- * was modified in NTFS 3.1 so we need to know which volume version this mft
- * record will be used on.
- *
- * Return 0 on success and -errno on error.
- */
-static int ntfs_mft_record_layout(const ntfs_volume *vol, const s64 mft_no,
- MFT_RECORD *m)
-{
- ATTR_RECORD *a;
-
- ntfs_debug("Entering for mft record 0x%llx.", (long long)mft_no);
- if (mft_no >= (1ll << 32)) {
- ntfs_error(vol->sb, "Mft record number 0x%llx exceeds "
- "maximum of 2^32.", (long long)mft_no);
- return -ERANGE;
- }
- /* Start by clearing the whole mft record to gives us a clean slate. */
- memset(m, 0, vol->mft_record_size);
- /* Aligned to 2-byte boundary. */
- if (vol->major_ver < 3 || (vol->major_ver == 3 && !vol->minor_ver))
- m->usa_ofs = cpu_to_le16((sizeof(MFT_RECORD_OLD) + 1) & ~1);
- else {
- m->usa_ofs = cpu_to_le16((sizeof(MFT_RECORD) + 1) & ~1);
- /*
- * Set the NTFS 3.1+ specific fields while we know that the
- * volume version is 3.1+.
- */
- m->reserved = 0;
- m->mft_record_number = cpu_to_le32((u32)mft_no);
- }
- m->magic = magic_FILE;
- if (vol->mft_record_size >= NTFS_BLOCK_SIZE)
- m->usa_count = cpu_to_le16(vol->mft_record_size /
- NTFS_BLOCK_SIZE + 1);
- else {
- m->usa_count = cpu_to_le16(1);
- ntfs_warning(vol->sb, "Sector size is bigger than mft record "
- "size. Setting usa_count to 1. If chkdsk "
- "reports this as corruption, please email "
- "linux-ntfs-dev@lists.sourceforge.net stating "
- "that you saw this message and that the "
- "modified file system created was corrupt. "
- "Thank you.");
- }
- /* Set the update sequence number to 1. */
- *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs)) = cpu_to_le16(1);
- m->lsn = 0;
- m->sequence_number = cpu_to_le16(1);
- m->link_count = 0;
- /*
- * Place the attributes straight after the update sequence array,
- * aligned to 8-byte boundary.
- */
- m->attrs_offset = cpu_to_le16((le16_to_cpu(m->usa_ofs) +
- (le16_to_cpu(m->usa_count) << 1) + 7) & ~7);
- m->flags = 0;
- /*
- * Using attrs_offset plus eight bytes (for the termination attribute).
- * attrs_offset is already aligned to 8-byte boundary, so no need to
- * align again.
- */
- m->bytes_in_use = cpu_to_le32(le16_to_cpu(m->attrs_offset) + 8);
- m->bytes_allocated = cpu_to_le32(vol->mft_record_size);
- m->base_mft_record = 0;
- m->next_attr_instance = 0;
- /* Add the termination attribute. */
- a = (ATTR_RECORD*)((u8*)m + le16_to_cpu(m->attrs_offset));
- a->type = AT_END;
- a->length = 0;
- ntfs_debug("Done.");
- return 0;
-}
-
-/**
- * ntfs_mft_record_format - format an mft record on an ntfs volume
- * @vol: volume on which to format the mft record
- * @mft_no: mft record number to format
- *
- * Format the mft record @mft_no in $MFT/$DATA, i.e. lay out an empty, unused
- * mft record into the appropriate place of the mft data attribute. This is
- * used when extending the mft data attribute.
- *
- * Return 0 on success and -errno on error.
- */
-static int ntfs_mft_record_format(const ntfs_volume *vol, const s64 mft_no)
-{
- struct inode *mft_vi = vol->mft_ino;
- struct page *page;
- MFT_RECORD *m;
- pgoff_t index, end_index;
- unsigned int ofs;
- int err;
-
- ntfs_debug("Entering for mft record 0x%llx.", (long long)mft_no);
- /*
- * The index into the page cache and the offset within the page cache
- * page of the wanted mft record.
- */
- index = mft_no << vol->mft_record_size_bits >> PAGE_CACHE_SHIFT;
- ofs = (mft_no << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK;
- /* The maximum valid index into the page cache for $MFT's data. */
- end_index = mft_vi->i_size >> PAGE_CACHE_SHIFT;
- if (unlikely(index >= end_index)) {
- if (unlikely(index > end_index || ofs + vol->mft_record_size >=
- (mft_vi->i_size & ~PAGE_CACHE_MASK))) {
- ntfs_error(vol->sb, "Tried to format non-existing mft "
- "record 0x%llx.", (long long)mft_no);
- return -ENOENT;
- }
- }
- /* Read, map, and pin the page containing the mft record. */
- page = ntfs_map_page(mft_vi->i_mapping, index);
- if (unlikely(IS_ERR(page))) {
- ntfs_error(vol->sb, "Failed to map page containing mft record "
- "to format 0x%llx.", (long long)mft_no);
- return PTR_ERR(page);
- }
- lock_page(page);
- BUG_ON(!PageUptodate(page));
- ClearPageUptodate(page);
- m = (MFT_RECORD*)((u8*)page_address(page) + ofs);
- err = ntfs_mft_record_layout(vol, mft_no, m);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to layout mft record 0x%llx.",
- (long long)mft_no);
- SetPageUptodate(page);
- unlock_page(page);
- ntfs_unmap_page(page);
- return err;
- }
- flush_dcache_page(page);
- SetPageUptodate(page);
- unlock_page(page);
- /*
- * Make sure the mft record is written out to disk. We could use
- * ilookup5() to check if an inode is in icache and so on but this is
- * unnecessary as ntfs_writepage() will write the dirty record anyway.
- */
- mark_ntfs_record_dirty(page, ofs);
- ntfs_unmap_page(page);
- ntfs_debug("Done.");
- return 0;
-}
-
-/**
- * ntfs_mft_record_alloc - allocate an mft record on an ntfs volume
- * @vol: [IN] volume on which to allocate the mft record
- * @mode: [IN] mode if want a file or directory, i.e. base inode or 0
- * @base_ni: [IN] open base inode if allocating an extent mft record or NULL
- * @mrec: [OUT] on successful return this is the mapped mft record
- *
- * Allocate an mft record in $MFT/$DATA of an open ntfs volume @vol.
- *
- * If @base_ni is NULL make the mft record a base mft record, i.e. a file or
- * direvctory inode, and allocate it at the default allocator position. In
- * this case @mode is the file mode as given to us by the caller. We in
- * particular use @mode to distinguish whether a file or a directory is being
- * created (S_IFDIR(mode) and S_IFREG(mode), respectively).
- *
- * If @base_ni is not NULL make the allocated mft record an extent record,
- * allocate it starting at the mft record after the base mft record and attach
- * the allocated and opened ntfs inode to the base inode @base_ni. In this
- * case @mode must be 0 as it is meaningless for extent inodes.
- *
- * You need to check the return value with IS_ERR(). If false, the function
- * was successful and the return value is the now opened ntfs inode of the
- * allocated mft record. *@mrec is then set to the allocated, mapped, pinned,
- * and locked mft record. If IS_ERR() is true, the function failed and the
- * error code is obtained from PTR_ERR(return value). *@mrec is undefined in
- * this case.
- *
- * Allocation strategy:
- *
- * To find a free mft record, we scan the mft bitmap for a zero bit. To
- * optimize this we start scanning at the place specified by @base_ni or if
- * @base_ni is NULL we start where we last stopped and we perform wrap around
- * when we reach the end. Note, we do not try to allocate mft records below
- * number 24 because numbers 0 to 15 are the defined system files anyway and 16
- * to 24 are special in that they are used for storing extension mft records
- * for the $DATA attribute of $MFT. This is required to avoid the possibility
- * of creating a runlist with a circular dependency which once written to disk
- * can never be read in again. Windows will only use records 16 to 24 for
- * normal files if the volume is completely out of space. We never use them
- * which means that when the volume is really out of space we cannot create any
- * more files while Windows can still create up to 8 small files. We can start
- * doing this at some later time, it does not matter much for now.
- *
- * When scanning the mft bitmap, we only search up to the last allocated mft
- * record. If there are no free records left in the range 24 to number of
- * allocated mft records, then we extend the $MFT/$DATA attribute in order to
- * create free mft records. We extend the allocated size of $MFT/$DATA by 16
- * records at a time or one cluster, if cluster size is above 16kiB. If there
- * is not sufficient space to do this, we try to extend by a single mft record
- * or one cluster, if cluster size is above the mft record size.
- *
- * No matter how many mft records we allocate, we initialize only the first
- * allocated mft record, incrementing mft data size and initialized size
- * accordingly, open an ntfs_inode for it and return it to the caller, unless
- * there are less than 24 mft records, in which case we allocate and initialize
- * mft records until we reach record 24 which we consider as the first free mft
- * record for use by normal files.
- *
- * If during any stage we overflow the initialized data in the mft bitmap, we
- * extend the initialized size (and data size) by 8 bytes, allocating another
- * cluster if required. The bitmap data size has to be at least equal to the
- * number of mft records in the mft, but it can be bigger, in which case the
- * superflous bits are padded with zeroes.
- *
- * Thus, when we return successfully (IS_ERR() is false), we will have:
- * - initialized / extended the mft bitmap if necessary,
- * - initialized / extended the mft data if necessary,
- * - set the bit corresponding to the mft record being allocated in the
- * mft bitmap,
- * - opened an ntfs_inode for the allocated mft record, and we will have
- * - returned the ntfs_inode as well as the allocated mapped, pinned, and
- * locked mft record.
- *
- * On error, the volume will be left in a consistent state and no record will
- * be allocated. If rolling back a partial operation fails, we may leave some
- * inconsistent metadata in which case we set NVolErrors() so the volume is
- * left dirty when unmounted.
- *
- * Note, this function cannot make use of most of the normal functions, like
- * for example for attribute resizing, etc, because when the run list overflows
- * the base mft record and an attribute list is used, it is very important that
- * the extension mft records used to store the $DATA attribute of $MFT can be
- * reached without having to read the information contained inside them, as
- * this would make it impossible to find them in the first place after the
- * volume is unmounted. $MFT/$BITMAP probably does not need to follow this
- * rule because the bitmap is not essential for finding the mft records, but on
- * the other hand, handling the bitmap in this special way would make life
- * easier because otherwise there might be circular invocations of functions
- * when reading the bitmap.
- */
-ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode,
- ntfs_inode *base_ni, MFT_RECORD **mrec)
-{
- s64 ll, bit, old_data_initialized, old_data_size;
- struct inode *vi;
- struct page *page;
- ntfs_inode *mft_ni, *mftbmp_ni, *ni;
- ntfs_attr_search_ctx *ctx;
- MFT_RECORD *m;
- ATTR_RECORD *a;
- pgoff_t index;
- unsigned int ofs;
- int err;
- le16 seq_no, usn;
- BOOL record_formatted = FALSE;
-
- if (base_ni) {
- ntfs_debug("Entering (allocating an extent mft record for "
- "base mft record 0x%llx).",
- (long long)base_ni->mft_no);
- /* @mode and @base_ni are mutually exclusive. */
- BUG_ON(mode);
- } else
- ntfs_debug("Entering (allocating a base mft record).");
- if (mode) {
- /* @mode and @base_ni are mutually exclusive. */
- BUG_ON(base_ni);
- /* We only support creation of normal files and directories. */
- if (!S_ISREG(mode) && !S_ISDIR(mode))
- return ERR_PTR(-EOPNOTSUPP);
- }
- BUG_ON(!mrec);
- mft_ni = NTFS_I(vol->mft_ino);
- mftbmp_ni = NTFS_I(vol->mftbmp_ino);
- down_write(&vol->mftbmp_lock);
- bit = ntfs_mft_bitmap_find_and_alloc_free_rec_nolock(vol, base_ni);
- if (bit >= 0) {
- ntfs_debug("Found and allocated free record (#1), bit 0x%llx.",
- (long long)bit);
- goto have_alloc_rec;
- }
- if (bit != -ENOSPC) {
- up_write(&vol->mftbmp_lock);
- return ERR_PTR(bit);
- }
- /*
- * No free mft records left. If the mft bitmap already covers more
- * than the currently used mft records, the next records are all free,
- * so we can simply allocate the first unused mft record.
- * Note: We also have to make sure that the mft bitmap at least covers
- * the first 24 mft records as they are special and whilst they may not
- * be in use, we do not allocate from them.
- */
- ll = mft_ni->initialized_size >> vol->mft_record_size_bits;
- if (mftbmp_ni->initialized_size << 3 > ll &&
- mftbmp_ni->initialized_size > 3) {
- bit = ll;
- if (bit < 24)
- bit = 24;
- if (unlikely(bit >= (1ll << 32)))
- goto max_err_out;
- ntfs_debug("Found free record (#2), bit 0x%llx.",
- (long long)bit);
- goto found_free_rec;
- }
- /*
- * The mft bitmap needs to be expanded until it covers the first unused
- * mft record that we can allocate.
- * Note: The smallest mft record we allocate is mft record 24.
- */
- bit = mftbmp_ni->initialized_size << 3;
- if (unlikely(bit >= (1ll << 32)))
- goto max_err_out;
- ntfs_debug("Status of mftbmp before extension: allocated_size 0x%llx, "
- "data_size 0x%llx, initialized_size 0x%llx.",
- (long long)mftbmp_ni->allocated_size,
- (long long)vol->mftbmp_ino->i_size,
- (long long)mftbmp_ni->initialized_size);
- if (mftbmp_ni->initialized_size + 8 > mftbmp_ni->allocated_size) {
- /* Need to extend bitmap by one more cluster. */
- ntfs_debug("mftbmp: initialized_size + 8 > allocated_size.");
- err = ntfs_mft_bitmap_extend_allocation_nolock(vol);
- if (unlikely(err)) {
- up_write(&vol->mftbmp_lock);
- goto err_out;
- }
- ntfs_debug("Status of mftbmp after allocation extension: "
- "allocated_size 0x%llx, data_size 0x%llx, "
- "initialized_size 0x%llx.",
- (long long)mftbmp_ni->allocated_size,
- (long long)vol->mftbmp_ino->i_size,
- (long long)mftbmp_ni->initialized_size);
- }
- /*
- * We now have sufficient allocated space, extend the initialized_size
- * as well as the data_size if necessary and fill the new space with
- * zeroes.
- */
- err = ntfs_mft_bitmap_extend_initialized_nolock(vol);
- if (unlikely(err)) {
- up_write(&vol->mftbmp_lock);
- goto err_out;
- }
- ntfs_debug("Status of mftbmp after initialized extention: "
- "allocated_size 0x%llx, data_size 0x%llx, "
- "initialized_size 0x%llx.",
- (long long)mftbmp_ni->allocated_size,
- (long long)vol->mftbmp_ino->i_size,
- (long long)mftbmp_ni->initialized_size);
- ntfs_debug("Found free record (#3), bit 0x%llx.", (long long)bit);
-found_free_rec:
- /* @bit is the found free mft record, allocate it in the mft bitmap. */
- ntfs_debug("At found_free_rec.");
- err = ntfs_bitmap_set_bit(vol->mftbmp_ino, bit);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to allocate bit in mft bitmap.");
- up_write(&vol->mftbmp_lock);
- goto err_out;
- }
- ntfs_debug("Set bit 0x%llx in mft bitmap.", (long long)bit);
-have_alloc_rec:
- /*
- * The mft bitmap is now uptodate. Deal with mft data attribute now.
- * Note, we keep hold of the mft bitmap lock for writing until all
- * modifications to the mft data attribute are complete, too, as they
- * will impact decisions for mft bitmap and mft record allocation done
- * by a parallel allocation and if the lock is not maintained a
- * parallel allocation could allocate the same mft record as this one.
- */
- ll = (bit + 1) << vol->mft_record_size_bits;
- if (ll <= mft_ni->initialized_size) {
- ntfs_debug("Allocated mft record already initialized.");
- goto mft_rec_already_initialized;
- }
- ntfs_debug("Initializing allocated mft record.");
- /*
- * The mft record is outside the initialized data. Extend the mft data
- * attribute until it covers the allocated record. The loop is only
- * actually traversed more than once when a freshly formatted volume is
- * first written to so it optimizes away nicely in the common case.
- */
- ntfs_debug("Status of mft data before extension: "
- "allocated_size 0x%llx, data_size 0x%llx, "
- "initialized_size 0x%llx.",
- (long long)mft_ni->allocated_size,
- (long long)vol->mft_ino->i_size,
- (long long)mft_ni->initialized_size);
- while (ll > mft_ni->allocated_size) {
- err = ntfs_mft_data_extend_allocation_nolock(vol);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to extend mft data "
- "allocation.");
- goto undo_mftbmp_alloc_nolock;
- }
- ntfs_debug("Status of mft data after allocation extension: "
- "allocated_size 0x%llx, data_size 0x%llx, "
- "initialized_size 0x%llx.",
- (long long)mft_ni->allocated_size,
- (long long)vol->mft_ino->i_size,
- (long long)mft_ni->initialized_size);
- }
- /*
- * Extend mft data initialized size (and data size of course) to reach
- * the allocated mft record, formatting the mft records allong the way.
- * Note: We only modify the ntfs_inode structure as that is all that is
- * needed by ntfs_mft_record_format(). We will update the attribute
- * record itself in one fell swoop later on.
- */
- old_data_initialized = mft_ni->initialized_size;
- old_data_size = vol->mft_ino->i_size;
- while (ll > mft_ni->initialized_size) {
- s64 new_initialized_size, mft_no;
-
- new_initialized_size = mft_ni->initialized_size +
- vol->mft_record_size;
- mft_no = mft_ni->initialized_size >> vol->mft_record_size_bits;
- if (new_initialized_size > vol->mft_ino->i_size)
- vol->mft_ino->i_size = new_initialized_size;
- ntfs_debug("Initializing mft record 0x%llx.",
- (long long)mft_no);
- err = ntfs_mft_record_format(vol, mft_no);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to format mft record.");
- goto undo_data_init;
- }
- mft_ni->initialized_size = new_initialized_size;
- }
- record_formatted = TRUE;
- /* Update the mft data attribute record to reflect the new sizes. */
- m = map_mft_record(mft_ni);
- if (IS_ERR(m)) {
- ntfs_error(vol->sb, "Failed to map mft record.");
- err = PTR_ERR(m);
- goto undo_data_init;
- }
- ctx = ntfs_attr_get_search_ctx(mft_ni, m);
- if (unlikely(!ctx)) {
- ntfs_error(vol->sb, "Failed to get search context.");
- err = -ENOMEM;
- unmap_mft_record(mft_ni);
- goto undo_data_init;
- }
- err = ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len,
- CASE_SENSITIVE, 0, NULL, 0, ctx);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to find first attribute extent of "
- "mft data attribute.");
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- goto undo_data_init;
- }
- a = ctx->attr;
- a->data.non_resident.initialized_size =
- cpu_to_sle64(mft_ni->initialized_size);
- a->data.non_resident.data_size = cpu_to_sle64(vol->mft_ino->i_size);
- /* Ensure the changes make it to disk. */
- flush_dcache_mft_record_page(ctx->ntfs_ino);
- mark_mft_record_dirty(ctx->ntfs_ino);
- ntfs_attr_put_search_ctx(ctx);
- unmap_mft_record(mft_ni);
- ntfs_debug("Status of mft data after mft record initialization: "
- "allocated_size 0x%llx, data_size 0x%llx, "
- "initialized_size 0x%llx.",
- (long long)mft_ni->allocated_size,
- (long long)vol->mft_ino->i_size,
- (long long)mft_ni->initialized_size);
- BUG_ON(vol->mft_ino->i_size > mft_ni->allocated_size);
- BUG_ON(mft_ni->initialized_size > vol->mft_ino->i_size);
-mft_rec_already_initialized:
- /*
- * We can finally drop the mft bitmap lock as the mft data attribute
- * has been fully updated. The only disparity left is that the
- * allocated mft record still needs to be marked as in use to match the
- * set bit in the mft bitmap but this is actually not a problem since
- * this mft record is not referenced from anywhere yet and the fact
- * that it is allocated in the mft bitmap means that no-one will try to
- * allocate it either.
- */
- up_write(&vol->mftbmp_lock);
- /*
- * We now have allocated and initialized the mft record. Calculate the
- * index of and the offset within the page cache page the record is in.
- */
- index = bit << vol->mft_record_size_bits >> PAGE_CACHE_SHIFT;
- ofs = (bit << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK;
- /* Read, map, and pin the page containing the mft record. */
- page = ntfs_map_page(vol->mft_ino->i_mapping, index);
- if (unlikely(IS_ERR(page))) {
- ntfs_error(vol->sb, "Failed to map page containing allocated "
- "mft record 0x%llx.", (long long)bit);
- err = PTR_ERR(page);
- goto undo_mftbmp_alloc;
- }
- lock_page(page);
- BUG_ON(!PageUptodate(page));
- ClearPageUptodate(page);
- m = (MFT_RECORD*)((u8*)page_address(page) + ofs);
- /* If we just formatted the mft record no need to do it again. */
- if (!record_formatted) {
- /* Sanity check that the mft record is really not in use. */
- if (ntfs_is_file_record(m->magic) &&
- (m->flags & MFT_RECORD_IN_USE)) {
- ntfs_error(vol->sb, "Mft record 0x%llx was marked "
- "free in mft bitmap but is marked "
- "used itself. Corrupt filesystem. "
- "Unmount and run chkdsk.",
- (long long)bit);
- err = -EIO;
- SetPageUptodate(page);
- unlock_page(page);
- ntfs_unmap_page(page);
- NVolSetErrors(vol);
- goto undo_mftbmp_alloc;
- }
- /*
- * We need to (re-)format the mft record, preserving the
- * sequence number if it is not zero as well as the update
- * sequence number if it is not zero or -1 (0xffff). This
- * means we do not need to care whether or not something went
- * wrong with the previous mft record.
- */
- seq_no = m->sequence_number;
- usn = *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs));
- err = ntfs_mft_record_layout(vol, bit, m);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to layout allocated mft "
- "record 0x%llx.", (long long)bit);
- SetPageUptodate(page);
- unlock_page(page);
- ntfs_unmap_page(page);
- goto undo_mftbmp_alloc;
- }
- if (seq_no)
- m->sequence_number = seq_no;
- if (usn && le16_to_cpu(usn) != 0xffff)
- *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs)) = usn;
- }
- /* Set the mft record itself in use. */
- m->flags |= MFT_RECORD_IN_USE;
- if (S_ISDIR(mode))
- m->flags |= MFT_RECORD_IS_DIRECTORY;
- flush_dcache_page(page);
- SetPageUptodate(page);
- if (base_ni) {
- /*
- * Setup the base mft record in the extent mft record. This
- * completes initialization of the allocated extent mft record
- * and we can simply use it with map_extent_mft_record().
- */
- m->base_mft_record = MK_LE_MREF(base_ni->mft_no,
- base_ni->seq_no);
- /*
- * Allocate an extent inode structure for the new mft record,
- * attach it to the base inode @base_ni and map, pin, and lock
- * its, i.e. the allocated, mft record.
- */
- m = map_extent_mft_record(base_ni, bit, &ni);
- if (IS_ERR(m)) {
- ntfs_error(vol->sb, "Failed to map allocated extent "
- "mft record 0x%llx.", (long long)bit);
- err = PTR_ERR(m);
- /* Set the mft record itself not in use. */
- m->flags &= cpu_to_le16(
- ~le16_to_cpu(MFT_RECORD_IN_USE));
- flush_dcache_page(page);
- /* Make sure the mft record is written out to disk. */
- mark_ntfs_record_dirty(page, ofs);
- unlock_page(page);
- ntfs_unmap_page(page);
- goto undo_mftbmp_alloc;
- }
- /*
- * Make sure the allocated mft record is written out to disk.
- * No need to set the inode dirty because the caller is going
- * to do that anyway after finishing with the new extent mft
- * record (e.g. at a minimum a new attribute will be added to
- * the mft record.
- */
- mark_ntfs_record_dirty(page, ofs);
- unlock_page(page);
- /*
- * Need to unmap the page since map_extent_mft_record() mapped
- * it as well so we have it mapped twice at the moment.
- */
- ntfs_unmap_page(page);
- } else {
- /*
- * Allocate a new VFS inode and set it up. NOTE: @vi->i_nlink
- * is set to 1 but the mft record->link_count is 0. The caller
- * needs to bear this in mind.
- */
- vi = new_inode(vol->sb);
- if (unlikely(!vi)) {
- err = -ENOMEM;
- /* Set the mft record itself not in use. */
- m->flags &= cpu_to_le16(
- ~le16_to_cpu(MFT_RECORD_IN_USE));
- flush_dcache_page(page);
- /* Make sure the mft record is written out to disk. */
- mark_ntfs_record_dirty(page, ofs);
- unlock_page(page);
- ntfs_unmap_page(page);
- goto undo_mftbmp_alloc;
- }
- vi->i_ino = bit;
- /*
- * This is the optimal IO size (for stat), not the fs block
- * size.
- */
- vi->i_blksize = PAGE_CACHE_SIZE;
- /*
- * This is for checking whether an inode has changed w.r.t. a
- * file so that the file can be updated if necessary (compare
- * with f_version).
- */
- vi->i_version = 1;
-
- /* The owner and group come from the ntfs volume. */
- vi->i_uid = vol->uid;
- vi->i_gid = vol->gid;
-
- /* Initialize the ntfs specific part of @vi. */
- ntfs_init_big_inode(vi);
- ni = NTFS_I(vi);
- /*
- * Set the appropriate mode, attribute type, and name. For
- * directories, also setup the index values to the defaults.
- */
- if (S_ISDIR(mode)) {
- vi->i_mode = S_IFDIR | S_IRWXUGO;
- vi->i_mode &= ~vol->dmask;
-
- NInoSetMstProtected(ni);
- ni->type = AT_INDEX_ALLOCATION;
- ni->name = I30;
- ni->name_len = 4;
-
- ni->itype.index.block_size = 4096;
- ni->itype.index.block_size_bits = generic_ffs(4096) - 1;
- ni->itype.index.collation_rule = COLLATION_FILE_NAME;
- if (vol->cluster_size <= ni->itype.index.block_size) {
- ni->itype.index.vcn_size = vol->cluster_size;
- ni->itype.index.vcn_size_bits =
- vol->cluster_size_bits;
- } else {
- ni->itype.index.vcn_size = vol->sector_size;
- ni->itype.index.vcn_size_bits =
- vol->sector_size_bits;
- }
- } else {
- vi->i_mode = S_IFREG | S_IRWXUGO;
- vi->i_mode &= ~vol->fmask;
-
- ni->type = AT_DATA;
- ni->name = NULL;
- ni->name_len = 0;
- }
- if (IS_RDONLY(vi))
- vi->i_mode &= ~S_IWUGO;
-
- /* Set the inode times to the current time. */
- vi->i_atime = vi->i_mtime = vi->i_ctime = current_kernel_time();
- /*
- * Set the file size to 0, the ntfs inode sizes are set to 0 by
- * the call to ntfs_init_big_inode() below.
- */
- vi->i_size = 0;
- vi->i_blocks = 0;
-
- /* Set the sequence number. */
- vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
- /*
- * Manually map, pin, and lock the mft record as we already
- * have its page mapped and it is very easy to do.
- */
- atomic_inc(&ni->count);
- down(&ni->mrec_lock);
- ni->page = page;
- ni->page_ofs = ofs;
- /*
- * Make sure the allocated mft record is written out to disk.
- * NOTE: We do not set the ntfs inode dirty because this would
- * fail in ntfs_write_inode() because the inode does not have a
- * standard information attribute yet. Also, there is no need
- * to set the inode dirty because the caller is going to do
- * that anyway after finishing with the new mft record (e.g. at
- * a minimum some new attributes will be added to the mft
- * record.
- */
- mark_ntfs_record_dirty(page, ofs);
- unlock_page(page);
-
- /* Add the inode to the inode hash for the superblock. */
- insert_inode_hash(vi);
-
- /* Update the default mft allocation position. */
- vol->mft_data_pos = bit + 1;
- }
- /*
- * Return the opened, allocated inode of the allocated mft record as
- * well as the mapped, pinned, and locked mft record.
- */
- ntfs_debug("Returning opened, allocated %sinode 0x%llx.",
- base_ni ? "extent " : "", (long long)bit);
- *mrec = m;
- return ni;
-undo_data_init:
- mft_ni->initialized_size = old_data_initialized;
- vol->mft_ino->i_size = old_data_size;
- goto undo_mftbmp_alloc_nolock;
-undo_mftbmp_alloc:
- down_write(&vol->mftbmp_lock);
-undo_mftbmp_alloc_nolock:
- if (ntfs_bitmap_clear_bit(vol->mftbmp_ino, bit)) {
- ntfs_error(vol->sb, "Failed to clear bit in mft bitmap.%s", es);
- NVolSetErrors(vol);
- }
- up_write(&vol->mftbmp_lock);
-err_out:
- return ERR_PTR(err);
-max_err_out:
- ntfs_warning(vol->sb, "Cannot allocate mft record because the maximum "
- "number of inodes (2^32) has already been reached.");
- up_write(&vol->mftbmp_lock);
- return ERR_PTR(-ENOSPC);
}
-/**
- * ntfs_extent_mft_record_free - free an extent mft record on an ntfs volume
- * @ni: ntfs inode of the mapped extent mft record to free
- * @m: mapped extent mft record of the ntfs inode @ni
- *
- * Free the mapped extent mft record @m of the extent ntfs inode @ni.
- *
- * Note that this function unmaps the mft record and closes and destroys @ni
- * internally and hence you cannot use either @ni nor @m any more after this
- * function returns success.
- *
- * On success return 0 and on error return -errno. @ni and @m are still valid
- * in this case and have not been freed.
- *
- * For some errors an error message is displayed and the success code 0 is
- * returned and the volume is then left dirty on umount. This makes sense in
- * case we could not rollback the changes that were already done since the
- * caller no longer wants to reference this mft record so it does not matter to
- * the caller if something is wrong with it as long as it is properly detached
- * from the base inode.
- */
-int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m)
-{
- unsigned long mft_no = ni->mft_no;
- ntfs_volume *vol = ni->vol;
- ntfs_inode *base_ni;
- ntfs_inode **extent_nis;
- int i, err;
- le16 old_seq_no;
- u16 seq_no;
-
- BUG_ON(NInoAttr(ni));
- BUG_ON(ni->nr_extents != -1);
-
- down(&ni->extent_lock);
- base_ni = ni->ext.base_ntfs_ino;
- up(&ni->extent_lock);
-
- BUG_ON(base_ni->nr_extents <= 0);
-
- ntfs_debug("Entering for extent inode 0x%lx, base inode 0x%lx.\n",
- mft_no, base_ni->mft_no);
-
- down(&base_ni->extent_lock);
-
- /* Make sure we are holding the only reference to the extent inode. */
- if (atomic_read(&ni->count) > 2) {
- ntfs_error(vol->sb, "Tried to free busy extent inode 0x%lx, "
- "not freeing.", base_ni->mft_no);
- up(&base_ni->extent_lock);
- return -EBUSY;
- }
-
- /* Dissociate the ntfs inode from the base inode. */
- extent_nis = base_ni->ext.extent_ntfs_inos;
- err = -ENOENT;
- for (i = 0; i < base_ni->nr_extents; i++) {
- if (ni != extent_nis[i])
- continue;
- extent_nis += i;
- base_ni->nr_extents--;
- memmove(extent_nis, extent_nis + 1, (base_ni->nr_extents - i) *
- sizeof(ntfs_inode*));
- err = 0;
- break;
- }
-
- up(&base_ni->extent_lock);
-
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Extent inode 0x%lx is not attached to "
- "its base inode 0x%lx.", mft_no,
- base_ni->mft_no);
- BUG();
- }
-
- /*
- * The extent inode is no longer attached to the base inode so no one
- * can get a reference to it any more.
- */
-
- /* Mark the mft record as not in use. */
- m->flags &= const_cpu_to_le16(~const_le16_to_cpu(MFT_RECORD_IN_USE));
-
- /* Increment the sequence number, skipping zero, if it is not zero. */
- old_seq_no = m->sequence_number;
- seq_no = le16_to_cpu(old_seq_no);
- if (seq_no == 0xffff)
- seq_no = 1;
- else if (seq_no)
- seq_no++;
- m->sequence_number = cpu_to_le16(seq_no);
-
- /*
- * Set the ntfs inode dirty and write it out. We do not need to worry
- * about the base inode here since whatever caused the extent mft
- * record to be freed is guaranteed to do it already.
- */
- NInoSetDirty(ni);
- err = write_mft_record(ni, m, 0);
- if (unlikely(err)) {
- ntfs_error(vol->sb, "Failed to write mft record 0x%lx, not "
- "freeing.", mft_no);
- goto rollback;
- }
-rollback_error:
- /* Unmap and throw away the now freed extent inode. */
- unmap_extent_mft_record(ni);
- ntfs_clear_extent_inode(ni);
-
- /* Clear the bit in the $MFT/$BITMAP corresponding to this record. */
- down_write(&vol->mftbmp_lock);
- err = ntfs_bitmap_clear_bit(vol->mftbmp_ino, mft_no);
- up_write(&vol->mftbmp_lock);
- if (unlikely(err)) {
- /*
- * The extent inode is gone but we failed to deallocate it in
- * the mft bitmap. Just emit a warning and leave the volume
- * dirty on umount.
- */
- ntfs_error(vol->sb, "Failed to clear bit in mft bitmap.%s", es);
- NVolSetErrors(vol);
- }
- return 0;
-rollback:
- /* Rollback what we did... */
- down(&base_ni->extent_lock);
- extent_nis = base_ni->ext.extent_ntfs_inos;
- if (!(base_ni->nr_extents & 3)) {
- int new_size = (base_ni->nr_extents + 4) * sizeof(ntfs_inode*);
-
- extent_nis = (ntfs_inode**)kmalloc(new_size, GFP_NOFS);
- if (unlikely(!extent_nis)) {
- ntfs_error(vol->sb, "Failed to allocate internal "
- "buffer during rollback.%s", es);
- up(&base_ni->extent_lock);
- NVolSetErrors(vol);
- goto rollback_error;
- }
- if (base_ni->nr_extents) {
- BUG_ON(!base_ni->ext.extent_ntfs_inos);
- memcpy(extent_nis, base_ni->ext.extent_ntfs_inos,
- new_size - 4 * sizeof(ntfs_inode*));
- kfree(base_ni->ext.extent_ntfs_inos);
- }
- base_ni->ext.extent_ntfs_inos = extent_nis;
- }
- m->flags |= MFT_RECORD_IN_USE;
- m->sequence_number = old_seq_no;
- extent_nis[base_ni->nr_extents++] = ni;
- up(&base_ni->extent_lock);
- mark_mft_record_dirty(ni);
- return err;
-}
#endif /* NTFS_RW */
git://git.onelab.eu / linux-2.6.git / blobdiff