diff options
| -rw-r--r-- | fs/ocfs2/aops.c | 99 |
1 files changed, 61 insertions, 38 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 8368036f434..acf8f000672 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -137,6 +137,7 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock, { int err = 0; u64 p_blkno, past_eof; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, (unsigned long long)iblock, bh_result, create); @@ -151,15 +152,6 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock, goto bail; } - /* this can happen if another node truncs after our extend! */ - spin_lock(&OCFS2_I(inode)->ip_lock); - if (iblock >= ocfs2_clusters_to_blocks(inode->i_sb, - OCFS2_I(inode)->ip_clusters)) - err = -EIO; - spin_unlock(&OCFS2_I(inode)->ip_lock); - if (err) - goto bail; - err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL); if (err) { mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " @@ -168,22 +160,38 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock, goto bail; } - map_bh(bh_result, inode->i_sb, p_blkno); - - if (bh_result->b_blocknr == 0) { - err = -EIO; - mlog(ML_ERROR, "iblock = %llu p_blkno = %llu blkno=(%llu)\n", - (unsigned long long)iblock, - (unsigned long long)p_blkno, - (unsigned long long)OCFS2_I(inode)->ip_blkno); - } + /* + * ocfs2 never allocates in this function - the only time we + * need to use BH_New is when we're extending i_size on a file + * system which doesn't support holes, in which case BH_New + * allows block_prepare_write() to zero. + */ + mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb), + "ino %lu, iblock %llu\n", inode->i_ino, + (unsigned long long)iblock); + + if (p_blkno) + map_bh(bh_result, inode->i_sb, p_blkno); + + if (!ocfs2_sparse_alloc(osb)) { + if (p_blkno == 0) { + err = -EIO; + mlog(ML_ERROR, + "iblock = %llu p_blkno = %llu blkno=(%llu)\n", + (unsigned long long)iblock, + (unsigned long long)p_blkno, + (unsigned long long)OCFS2_I(inode)->ip_blkno); + mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); + dump_stack(); + } - past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); - mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, - (unsigned long long)past_eof); + past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); + mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, + (unsigned long long)past_eof); - if (create && (iblock >= past_eof)) - set_buffer_new(bh_result); + if (create && (iblock >= past_eof)) + set_buffer_new(bh_result); + } bail: if (err < 0) @@ -436,28 +444,15 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, * nicely aligned and of the right size, so there's no need * for us to check any of that. */ - spin_lock(&OCFS2_I(inode)->ip_lock); - inode_blocks = ocfs2_clusters_to_blocks(inode->i_sb, - OCFS2_I(inode)->ip_clusters); - - /* - * For a read which begins past the end of file, we return a hole. - */ - if (!create && (iblock >= inode_blocks)) { - spin_unlock(&OCFS2_I(inode)->ip_lock); - ret = 0; - goto bail; - } + inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); /* * Any write past EOF is not allowed because we'd be extending. */ if (create && (iblock + max_blocks) > inode_blocks) { - spin_unlock(&OCFS2_I(inode)->ip_lock); ret = -EIO; goto bail; } - spin_unlock(&OCFS2_I(inode)->ip_lock); /* This figures out the size of the next contiguous block, and * our logical offset */ @@ -470,7 +465,35 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, goto bail; } - map_bh(bh_result, inode->i_sb, p_blkno); + if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { + ocfs2_error(inode->i_sb, + "Inode %llu has a hole at block %llu\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)iblock); + ret = -EROFS; + goto bail; + } + + /* + * get_more_blocks() expects us to describe a hole by clearing + * the mapped bit on bh_result(). + */ + if (p_blkno) + map_bh(bh_result, inode->i_sb, p_blkno); + else { + /* + * ocfs2_prepare_inode_for_write() should have caught + * the case where we'd be filling a hole and triggered + * a buffered write instead. + */ + if (create) { + ret = -EIO; + mlog_errno(ret); + goto bail; + } + + clear_buffer_mapped(bh_result); + } /* make sure we don't map more than max_blocks blocks here as that's all the kernel will handle at this point. */ |