fs/ext4/extents.c

43 #define EXT4_EXT_MARK_UNWRIT1	0x2  /* mark first half unwritten */
44 #define EXT4_EXT_MARK_UNWRIT2	0x4  /* mark second half unwritten */
332 	int unwritten = ext4_ext_is_unwritten(path[path->p_depth].p_ext);
338 	return ext4_split_extent_at(handle, inode, ppath, lblk, unwritten ?
1807 	int merge_done = 0, unwritten;
1817 		unwritten = ext4_ext_is_unwritten(ex);
1820 		if (unwritten)
1978 	int mb_flags = 0, unwritten;
2030 			unwritten = ext4_ext_is_unwritten(ex);
2033 			if (unwritten)
2056 			unwritten = ext4_ext_is_unwritten(ex);
2061 			if (unwritten)
2408  * delayed and unwritten block.  A partial cluster meeting that
2579 	unsigned unwritten = 0;
2606 			unwritten = 1;
2608 			unwritten = 0;
2611 			  unwritten, ex_ee_len);
2696 		 * Do not mark unwritten if all the blocks in the
2699 		if (unwritten && num)
3139  *		 the states(init or unwritten) of new extents.
3312 	int unwritten;
3320 	unwritten = ext4_ext_is_unwritten(ex);
3325 		if (unwritten)
3351 	unwritten = ext4_ext_is_unwritten(ex);
3355 		if (unwritten) {
3373  * to an unwritten extent. It may result in splitting the unwritten
3375  * unwritten).
3382  *  - The extent pointed to by 'path' is unwritten.
3434 	 * unwritten extent to its neighbor. This is much cheaper
3628  * to an unwritten extent.
3630  * Writing to an unwritten extent may result in splitting the unwritten
3631  * extent into multiple initialized/unwritten extents (up to three)
3633  *   a> There is no split required: Entire extent should be unwritten
3637  * This works the same way in the case of initialized -> unwritten conversion.
3640  * the unwritten extent split. To prevent ENOSPC occur at the IO
3641  * complete, we need to split the unwritten extent before DIO submit
3642  * the IO. The unwritten extent called at this time will be split
3643  * into three unwritten extent(at most). After IO complete, the part
3647  * Returns the size of unwritten extent to be written on success.
3678 	/* Convert to unwritten */
3768 	 * unwritten extent
3801 	/* first mark the extent as unwritten */
3840 	 * When writing into unwritten space, we should not fail to
3882 	 * we already have an unwritten extent
3905 	 * discovered unwritten extent to written.
3914 	 * shouldn't get a 0 return when converting an unwritten extent
4174 		 * unwritten extents are treated as holes, except that
4191 			 * caller wants to convert it to unwritten.
4272 	 * EXT_INIT_MAX_LEN and for an unwritten extent this limit is
4332 	/* Mark unwritten */
4397 	 * when it is _not_ an unwritten extent.
4557 	 * unwritten and possibly manually zero out unaligned parts of the
4579 	 * Indirect files do not support unwritten extents
4667 	 * In worst case we have to writeout two nonadjacent unwritten
4809  * all unwritten extents within this range will be converted to
5603  * @unwritten: Mark second inode's extents as unwritten after swap
5618 		  ext4_lblk_t count, int unwritten, int *erp)
5751 		if (unwritten)
5873  * Updates physical block address and unwritten status of extent
5880 			      int len, int unwritten, ext4_fsblk_t pblk)
5925 	if (unwritten)