X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fntfs%2Fcompress.c;h=68a607ff9fd36d2f7e62b76546392029ff1111a7;hb=26294aef29acca3e3c33b81e9da506c56c91f3b4;hp=ee5ae706f8611cb5f2e66a8b42d1fa5675b11579;hpb=207e0a826fdee4bfe853681aef2175a739c11286;p=linux-2.6.git diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c index ee5ae706f..68a607ff9 100644 --- a/fs/ntfs/compress.c +++ b/fs/ntfs/compress.c @@ -67,7 +67,7 @@ static DEFINE_SPINLOCK(ntfs_cb_lock); /** * allocate_compression_buffers - allocate the decompression buffers * - * Caller has to hold the ntfs_lock semaphore. + * Caller has to hold the ntfs_lock mutex. * * Return 0 on success or -ENOMEM if the allocations failed. */ @@ -84,7 +84,7 @@ int allocate_compression_buffers(void) /** * free_compression_buffers - free the decompression buffers * - * Caller has to hold the ntfs_lock semaphore. + * Caller has to hold the ntfs_lock mutex. */ void free_compression_buffers(void) { @@ -96,13 +96,14 @@ void free_compression_buffers(void) /** * zero_partial_compressed_page - zero out of bounds compressed page region */ -static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page) +static void zero_partial_compressed_page(struct page *page, + const s64 initialized_size) { u8 *kp = page_address(page); unsigned int kp_ofs; ntfs_debug("Zeroing page region outside initialized size."); - if (((s64)page->index << PAGE_CACHE_SHIFT) >= ni->initialized_size) { + if (((s64)page->index << PAGE_CACHE_SHIFT) >= initialized_size) { /* * FIXME: Using clear_page() will become wrong when we get * PAGE_CACHE_SIZE != PAGE_SIZE but for now there is no problem. @@ -110,7 +111,7 @@ static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page) clear_page(kp); return; } - kp_ofs = ni->initialized_size & ~PAGE_CACHE_MASK; + kp_ofs = initialized_size & ~PAGE_CACHE_MASK; memset(kp + kp_ofs, 0, PAGE_CACHE_SIZE - kp_ofs); return; } @@ -118,12 +119,12 @@ static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page) /** * handle_bounds_compressed_page - test for&handle out of bounds compressed page */ -static inline void handle_bounds_compressed_page(ntfs_inode *ni, - struct page *page) +static inline void handle_bounds_compressed_page(struct page *page, + const loff_t i_size, const s64 initialized_size) { - if ((page->index >= (ni->initialized_size >> PAGE_CACHE_SHIFT)) && - (ni->initialized_size < VFS_I(ni)->i_size)) - zero_partial_compressed_page(ni, page); + if ((page->index >= (initialized_size >> PAGE_CACHE_SHIFT)) && + (initialized_size < i_size)) + zero_partial_compressed_page(page, initialized_size); return; } @@ -138,6 +139,8 @@ static inline void handle_bounds_compressed_page(ntfs_inode *ni, * @xpage_done: set to 1 if xpage was completed successfully (IN/OUT) * @cb_start: compression block to decompress (IN) * @cb_size: size of compression block @cb_start in bytes (IN) + * @i_size: file size when we started the read (IN) + * @initialized_size: initialized file size when we started the read (IN) * * The caller must have disabled preemption. ntfs_decompress() reenables it when * the critical section is finished. @@ -165,7 +168,8 @@ static inline void handle_bounds_compressed_page(ntfs_inode *ni, static int ntfs_decompress(struct page *dest_pages[], int *dest_index, int *dest_ofs, const int dest_max_index, const int dest_max_ofs, const int xpage, char *xpage_done, u8 *const cb_start, - const u32 cb_size) + const u32 cb_size, const loff_t i_size, + const s64 initialized_size) { /* * Pointers into the compressed data, i.e. the compression block (cb), @@ -219,9 +223,6 @@ return_error: spin_unlock(&ntfs_cb_lock); /* Second stage: finalize completed pages. */ if (nr_completed_pages > 0) { - struct page *page = dest_pages[completed_pages[0]]; - ntfs_inode *ni = NTFS_I(page->mapping->host); - for (i = 0; i < nr_completed_pages; i++) { int di = completed_pages[i]; @@ -230,7 +231,8 @@ return_error: * If we are outside the initialized size, zero * the out of bounds page range. */ - handle_bounds_compressed_page(ni, dp); + handle_bounds_compressed_page(dp, i_size, + initialized_size); flush_dcache_page(dp); kunmap(dp); SetPageUptodate(dp); @@ -478,12 +480,14 @@ return_overflow: */ int ntfs_read_compressed_block(struct page *page) { + loff_t i_size; + s64 initialized_size; struct address_space *mapping = page->mapping; ntfs_inode *ni = NTFS_I(mapping->host); ntfs_volume *vol = ni->vol; struct super_block *sb = vol->sb; runlist_element *rl; - unsigned long block_size = sb->s_blocksize; + unsigned long flags, block_size = sb->s_blocksize; unsigned char block_size_bits = sb->s_blocksize_bits; u8 *cb, *cb_pos, *cb_end; struct buffer_head **bhs; @@ -535,7 +539,6 @@ int ntfs_read_compressed_block(struct page *page) if (unlikely(!pages || !bhs)) { kfree(bhs); kfree(pages); - SetPageError(page); unlock_page(page); ntfs_error(vol->sb, "Failed to allocate internal buffers."); return -ENOMEM; @@ -552,8 +555,12 @@ int ntfs_read_compressed_block(struct page *page) * The remaining pages need to be allocated and inserted into the page * cache, alignment guarantees keep all the below much simpler. (-8 */ - max_page = ((VFS_I(ni)->i_size + PAGE_CACHE_SIZE - 1) >> - PAGE_CACHE_SHIFT) - offset; + read_lock_irqsave(&ni->size_lock, flags); + i_size = i_size_read(VFS_I(ni)); + initialized_size = ni->initialized_size; + read_unlock_irqrestore(&ni->size_lock, flags); + max_page = ((i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - + offset; if (nr_pages < max_page) max_page = nr_pages; for (i = 0; i < max_page; i++, offset++) { @@ -824,7 +831,8 @@ lock_retry_remap: * If we are outside the initialized size, zero * the out of bounds page range. */ - handle_bounds_compressed_page(ni, page); + handle_bounds_compressed_page(page, i_size, + initialized_size); flush_dcache_page(page); kunmap(page); SetPageUptodate(page); @@ -847,7 +855,8 @@ lock_retry_remap: ntfs_debug("Found compressed compression block."); err = ntfs_decompress(pages, &cur_page, &cur_ofs, cb_max_page, cb_max_ofs, xpage, &xpage_done, - cb_pos, cb_size - (cb_pos - cb)); + cb_pos, cb_size - (cb_pos - cb), i_size, + initialized_size); /* * We can sleep from now on, lock already dropped by * ntfs_decompress(). @@ -861,9 +870,6 @@ lock_retry_remap: for (; prev_cur_page < cur_page; prev_cur_page++) { page = pages[prev_cur_page]; if (page) { - if (prev_cur_page == xpage && - !xpage_done) - SetPageError(page); flush_dcache_page(page); kunmap(page); unlock_page(page); @@ -894,8 +900,6 @@ lock_retry_remap: "Terminating them with extreme " "prejudice. Inode 0x%lx, page index " "0x%lx.", ni->mft_no, page->index); - if (cur_page == xpage && !xpage_done) - SetPageError(page); flush_dcache_page(page); kunmap(page); unlock_page(page); @@ -943,8 +947,6 @@ err_out: for (i = cur_page; i < max_page; i++) { page = pages[i]; if (page) { - if (i == xpage && !xpage_done) - SetPageError(page); flush_dcache_page(page); kunmap(page); unlock_page(page);