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NTFS: Fix page_has_buffers()/page_buffers() handling in fs/ntfs/aops.c.

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Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-09-08 22:08:11 +01:00
parent 311120eca0
commit a01ac532b5
2 changed files with 22 additions and 17 deletions
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1
fs/ntfs/ChangeLog
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@ -85,6 +85,7 @@ ToDo/Notes:
removal of the get_bh()/put_bh() pairs for each buffer. removal of the get_bh()/put_bh() pairs for each buffer.
- Fix fs/ntfs/aops.c::ntfs_{read,write}_block() to handle the case - Fix fs/ntfs/aops.c::ntfs_{read,write}_block() to handle the case
where a concurrent truncate has truncated the runlist under our feet. where a concurrent truncate has truncated the runlist under our feet.
- Fix page_has_buffers()/page_buffers() handling in fs/ntfs/aops.c.
2.1.23 - Implement extension of resident files and make writing safe as well as 2.1.23 - Implement extension of resident files and make writing safe as well as
many bug fixes, cleanups, and enhancements... many bug fixes, cleanups, and enhancements...

26
fs/ntfs/aops.c
View File

@ -185,13 +185,15 @@ static int ntfs_read_block(struct page *page)
blocksize_bits = VFS_I(ni)->i_blkbits; blocksize_bits = VFS_I(ni)->i_blkbits;
blocksize = 1 << blocksize_bits; blocksize = 1 << blocksize_bits;
if (!page_has_buffers(page)) if (!page_has_buffers(page)) {
create_empty_buffers(page, blocksize, 0); create_empty_buffers(page, blocksize, 0);
bh = head = page_buffers(page); if (unlikely(!page_has_buffers(page))) {
if (unlikely(!bh)) {
unlock_page(page); unlock_page(page);
return -ENOMEM; return -ENOMEM;
} }
}
bh = head = page_buffers(page);
BUG_ON(!bh);
iblock = (s64)page->index << (PAGE_CACHE_SHIFT - blocksize_bits); iblock = (s64)page->index << (PAGE_CACHE_SHIFT - blocksize_bits);
read_lock_irqsave(&ni->size_lock, flags); read_lock_irqsave(&ni->size_lock, flags);
@ -530,19 +532,21 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc)
BUG_ON(!PageUptodate(page)); BUG_ON(!PageUptodate(page));
create_empty_buffers(page, blocksize, create_empty_buffers(page, blocksize,
(1 << BH_Uptodate) | (1 << BH_Dirty)); (1 << BH_Uptodate) | (1 << BH_Dirty));
} if (unlikely(!page_has_buffers(page))) {
bh = head = page_buffers(page); ntfs_warning(vol->sb, "Error allocating page "
if (unlikely(!bh)) { "buffers. Redirtying page so we try "
ntfs_warning(vol->sb, "Error allocating page buffers. " "again later.");
"Redirtying page so we try again later.");
/* /*
* Put the page back on mapping->dirty_pages, but leave its * Put the page back on mapping->dirty_pages, but leave
* buffer's dirty state as-is. * its buffers' dirty state as-is.
*/ */
redirty_page_for_writepage(wbc, page); redirty_page_for_writepage(wbc, page);
unlock_page(page); unlock_page(page);
return 0; return 0;
} }
}
bh = head = page_buffers(page);
BUG_ON(!bh);
/* NOTE: Different naming scheme to ntfs_read_block()! */ /* NOTE: Different naming scheme to ntfs_read_block()! */
@ -910,7 +914,6 @@ static int ntfs_write_mst_block(struct page *page,
sync = (wbc->sync_mode == WB_SYNC_ALL); sync = (wbc->sync_mode == WB_SYNC_ALL);
/* Make sure we have mapped buffers. */ /* Make sure we have mapped buffers. */
BUG_ON(!page_has_buffers(page));
bh = head = page_buffers(page); bh = head = page_buffers(page);
BUG_ON(!bh); BUG_ON(!bh);
@ -2397,6 +2400,7 @@ void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs) {
buffers_to_free = bh; buffers_to_free = bh;
} }
bh = head = page_buffers(page); bh = head = page_buffers(page);
BUG_ON(!bh);
do { do {
bh_ofs = bh_offset(bh); bh_ofs = bh_offset(bh);
if (bh_ofs + bh_size <= ofs) if (bh_ofs + bh_size <= ofs)