forked from ~ljy/RK356X_SDK_RELEASE
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hc
2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/fs/udf/inode.c
....@@ -57,15 +57,15 @@
5757 static int udf_sync_inode(struct inode *inode);
5858 static int udf_alloc_i_data(struct inode *inode, size_t size);
5959 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
60
-static int8_t udf_insert_aext(struct inode *, struct extent_position,
61
-			      struct kernel_lb_addr, uint32_t);
60
+static int udf_insert_aext(struct inode *, struct extent_position,
61
+			   struct kernel_lb_addr, uint32_t);
6262 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
6363 			      struct kernel_long_ad *, int *);
6464 static void udf_prealloc_extents(struct inode *, int, int,
6565 				 struct kernel_long_ad *, int *);
6666 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
67
-static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
68
-			       int, struct extent_position *);
67
+static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
68
+			      int, struct extent_position *);
6969 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
7070 
7171 static void __udf_clear_extent_cache(struct inode *inode)
....@@ -438,6 +438,12 @@
438438 		iinfo->i_next_alloc_goal++;
439439 	}
440440 
441
+	/*
442
+	 * Block beyond EOF and prealloc extents? Just discard preallocation
443
+	 * as it is not useful and complicates things.
444
+	 */
445
+	if (((loff_t)block) << inode->i_blkbits >= iinfo->i_lenExtents)
446
+		udf_discard_prealloc(inode);
441447 	udf_clear_extent_cache(inode);
442448 	phys = inode_getblk(inode, block, &err, &new);
443449 	if (!phys)
....@@ -487,8 +493,6 @@
487493 	uint32_t add;
488494 	int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
489495 	struct super_block *sb = inode->i_sb;
490
-	struct kernel_lb_addr prealloc_loc = {};
491
-	uint32_t prealloc_len = 0;
492496 	struct udf_inode_info *iinfo;
493497 	int err;
494498 
....@@ -509,19 +513,6 @@
509513 			~(sb->s_blocksize - 1);
510514 	}
511515 
512
-	/* Last extent are just preallocated blocks? */
513
-	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
514
-						EXT_NOT_RECORDED_ALLOCATED) {
515
-		/* Save the extent so that we can reattach it to the end */
516
-		prealloc_loc = last_ext->extLocation;
517
-		prealloc_len = last_ext->extLength;
518
-		/* Mark the extent as a hole */
519
-		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
520
-			(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
521
-		last_ext->extLocation.logicalBlockNum = 0;
522
-		last_ext->extLocation.partitionReferenceNum = 0;
523
-	}
524
-
525516 	/* Can we merge with the previous extent? */
526517 	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
527518 					EXT_NOT_RECORDED_NOT_ALLOCATED) {
....@@ -534,8 +525,10 @@
534525 	}
535526 
536527 	if (fake) {
537
-		udf_add_aext(inode, last_pos, &last_ext->extLocation,
538
-			     last_ext->extLength, 1);
528
+		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
529
+				   last_ext->extLength, 1);
530
+		if (err < 0)
531
+			goto out_err;
539532 		count++;
540533 	} else {
541534 		struct kernel_lb_addr tmploc;
....@@ -549,7 +542,7 @@
549542 		 * more extents, we may need to enter possible following
550543 		 * empty indirect extent.
551544 		 */
552
-		if (new_block_bytes || prealloc_len)
545
+		if (new_block_bytes)
553546 			udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
554547 	}
555548 
....@@ -569,7 +562,7 @@
569562 		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
570563 				   last_ext->extLength, 1);
571564 		if (err)
572
-			return err;
565
+			goto out_err;
573566 		count++;
574567 	}
575568 	if (new_block_bytes) {
....@@ -578,22 +571,11 @@
578571 		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
579572 				   last_ext->extLength, 1);
580573 		if (err)
581
-			return err;
574
+			goto out_err;
582575 		count++;
583576 	}
584577 
585578 out:
586
-	/* Do we have some preallocated blocks saved? */
587
-	if (prealloc_len) {
588
-		err = udf_add_aext(inode, last_pos, &prealloc_loc,
589
-				   prealloc_len, 1);
590
-		if (err)
591
-			return err;
592
-		last_ext->extLocation = prealloc_loc;
593
-		last_ext->extLength = prealloc_len;
594
-		count++;
595
-	}
596
-
597579 	/* last_pos should point to the last written extent... */
598580 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
599581 		last_pos->offset -= sizeof(struct short_ad);
....@@ -603,19 +585,28 @@
603585 		return -EIO;
604586 
605587 	return count;
588
+out_err:
589
+	/* Remove extents we've created so far */
590
+	udf_clear_extent_cache(inode);
591
+	udf_truncate_extents(inode);
592
+	return err;
606593 }
607594 
608595 /* Extend the final block of the file to final_block_len bytes */
609596 static void udf_do_extend_final_block(struct inode *inode,
610597 				      struct extent_position *last_pos,
611598 				      struct kernel_long_ad *last_ext,
612
-				      uint32_t final_block_len)
599
+				      uint32_t new_elen)
613600 {
614
-	struct super_block *sb = inode->i_sb;
615601 	uint32_t added_bytes;
616602 
617
-	added_bytes = final_block_len -
618
-		      (last_ext->extLength & (sb->s_blocksize - 1));
603
+	/*
604
+	 * Extent already large enough? It may be already rounded up to block
605
+	 * size...
606
+	 */
607
+	if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
608
+		return;
609
+	added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
619610 	last_ext->extLength += added_bytes;
620611 	UDF_I(inode)->i_lenExtents += added_bytes;
621612 
....@@ -632,12 +623,12 @@
632623 	int8_t etype;
633624 	struct super_block *sb = inode->i_sb;
634625 	sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
635
-	unsigned long partial_final_block;
626
+	loff_t new_elen;
636627 	int adsize;
637628 	struct udf_inode_info *iinfo = UDF_I(inode);
638629 	struct kernel_long_ad extent;
639630 	int err = 0;
640
-	int within_final_block;
631
+	bool within_last_ext;
641632 
642633 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
643634 		adsize = sizeof(struct short_ad);
....@@ -646,8 +637,17 @@
646637 	else
647638 		BUG();
648639 
640
+	/*
641
+	 * When creating hole in file, just don't bother with preserving
642
+	 * preallocation. It likely won't be very useful anyway.
643
+	 */
644
+	udf_discard_prealloc(inode);
645
+
649646 	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
650
-	within_final_block = (etype != -1);
647
+	within_last_ext = (etype != -1);
648
+	/* We don't expect extents past EOF... */
649
+	WARN_ON_ONCE(within_last_ext &&
650
+		     elen > ((loff_t)offset + 1) << inode->i_blkbits);
651651 
652652 	if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
653653 	    (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
....@@ -663,19 +663,17 @@
663663 		extent.extLength |= etype << 30;
664664 	}
665665 
666
-	partial_final_block = newsize & (sb->s_blocksize - 1);
666
+	new_elen = ((loff_t)offset << inode->i_blkbits) |
667
+					(newsize & (sb->s_blocksize - 1));
667668 
668669 	/* File has extent covering the new size (could happen when extending
669670 	 * inside a block)?
670671 	 */
671
-	if (within_final_block) {
672
+	if (within_last_ext) {
672673 		/* Extending file within the last file block */
673
-		udf_do_extend_final_block(inode, &epos, &extent,
674
-					  partial_final_block);
674
+		udf_do_extend_final_block(inode, &epos, &extent, new_elen);
675675 	} else {
676
-		loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
677
-			     partial_final_block;
678
-		err = udf_do_extend_file(inode, &epos, &extent, add);
676
+		err = udf_do_extend_file(inode, &epos, &extent, new_elen);
679677 	}
680678 
681679 	if (err < 0)
....@@ -697,7 +695,7 @@
697695 	struct kernel_lb_addr eloc, tmpeloc;
698696 	int c = 1;
699697 	loff_t lbcount = 0, b_off = 0;
700
-	udf_pblk_t newblocknum, newblock;
698
+	udf_pblk_t newblocknum, newblock = 0;
701699 	sector_t offset = 0;
702700 	int8_t etype;
703701 	struct udf_inode_info *iinfo = UDF_I(inode);
....@@ -776,10 +774,11 @@
776774 		goto out_free;
777775 	}
778776 
779
-	/* Are we beyond EOF? */
777
+	/* Are we beyond EOF and preallocated extent? */
780778 	if (etype == -1) {
781779 		int ret;
782780 		loff_t hole_len;
781
+
783782 		isBeyondEOF = true;
784783 		if (count) {
785784 			if (c)
....@@ -799,25 +798,22 @@
799798 		ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
800799 		if (ret < 0) {
801800 			*err = ret;
802
-			newblock = 0;
803801 			goto out_free;
804802 		}
805803 		c = 0;
806804 		offset = 0;
807805 		count += ret;
808
-		/* We are not covered by a preallocated extent? */
809
-		if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
810
-						EXT_NOT_RECORDED_ALLOCATED) {
811
-			/* Is there any real extent? - otherwise we overwrite
812
-			 * the fake one... */
813
-			if (count)
814
-				c = !c;
815
-			laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
816
-				inode->i_sb->s_blocksize;
817
-			memset(&laarr[c].extLocation, 0x00,
818
-				sizeof(struct kernel_lb_addr));
819
-			count++;
820
-		}
806
+		/*
807
+		 * Is there any real extent? - otherwise we overwrite the fake
808
+		 * one...
809
+		 */
810
+		if (count)
811
+			c = !c;
812
+		laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
813
+			inode->i_sb->s_blocksize;
814
+		memset(&laarr[c].extLocation, 0x00,
815
+			sizeof(struct kernel_lb_addr));
816
+		count++;
821817 		endnum = c + 1;
822818 		lastblock = 1;
823819 	} else {
....@@ -864,7 +860,6 @@
864860 				goal, err);
865861 		if (!newblocknum) {
866862 			*err = -ENOSPC;
867
-			newblock = 0;
868863 			goto out_free;
869864 		}
870865 		if (isBeyondEOF)
....@@ -890,7 +885,9 @@
890885 	/* write back the new extents, inserting new extents if the new number
891886 	 * of extents is greater than the old number, and deleting extents if
892887 	 * the new number of extents is less than the old number */
893
-	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
888
+	*err = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
889
+	if (*err < 0)
890
+		goto out_free;
894891 
895892 	newblock = udf_get_pblock(inode->i_sb, newblocknum,
896893 				iinfo->i_location.partitionReferenceNum, 0);
....@@ -1094,23 +1091,8 @@
10941091 			blocksize - 1) >> blocksize_bits)))) {
10951092 
10961093 			if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1097
-				(lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1098
-				blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1099
-				lip1->extLength = (lip1->extLength -
1100
-						  (li->extLength &
1101
-						   UDF_EXTENT_LENGTH_MASK) +
1102
-						   UDF_EXTENT_LENGTH_MASK) &
1103
-							~(blocksize - 1);
1104
-				li->extLength = (li->extLength &
1105
-						 UDF_EXTENT_FLAG_MASK) +
1106
-						(UDF_EXTENT_LENGTH_MASK + 1) -
1107
-						blocksize;
1108
-				lip1->extLocation.logicalBlockNum =
1109
-					li->extLocation.logicalBlockNum +
1110
-					((li->extLength &
1111
-						UDF_EXTENT_LENGTH_MASK) >>
1112
-						blocksize_bits);
1113
-			} else {
1094
+			     (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1095
+			     blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
11141096 				li->extLength = lip1->extLength +
11151097 					(((li->extLength &
11161098 						UDF_EXTENT_LENGTH_MASK) +
....@@ -1173,21 +1155,30 @@
11731155 	}
11741156 }
11751157 
1176
-static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1177
-			       int startnum, int endnum,
1178
-			       struct extent_position *epos)
1158
+static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1159
+			      int startnum, int endnum,
1160
+			      struct extent_position *epos)
11791161 {
11801162 	int start = 0, i;
11811163 	struct kernel_lb_addr tmploc;
11821164 	uint32_t tmplen;
1165
+	int err;
11831166 
11841167 	if (startnum > endnum) {
11851168 		for (i = 0; i < (startnum - endnum); i++)
11861169 			udf_delete_aext(inode, *epos);
11871170 	} else if (startnum < endnum) {
11881171 		for (i = 0; i < (endnum - startnum); i++) {
1189
-			udf_insert_aext(inode, *epos, laarr[i].extLocation,
1190
-					laarr[i].extLength);
1172
+			err = udf_insert_aext(inode, *epos,
1173
+					      laarr[i].extLocation,
1174
+					      laarr[i].extLength);
1175
+			/*
1176
+			 * If we fail here, we are likely corrupting the extent
1177
+			 * list and leaking blocks. At least stop early to
1178
+			 * limit the damage.
1179
+			 */
1180
+			if (err < 0)
1181
+				return err;
11911182 			udf_next_aext(inode, epos, &laarr[i].extLocation,
11921183 				      &laarr[i].extLength, 1);
11931184 			start++;
....@@ -1199,6 +1190,7 @@
11991190 		udf_write_aext(inode, epos, &laarr[i].extLocation,
12001191 			       laarr[i].extLength, 1);
12011192 	}
1193
+	return 0;
12021194 }
12031195 
12041196 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
....@@ -1401,6 +1393,7 @@
14011393 		ret = -EIO;
14021394 		goto out;
14031395 	}
1396
+	iinfo->i_hidden = hidden_inode;
14041397 	iinfo->i_unique = 0;
14051398 	iinfo->i_lenEAttr = 0;
14061399 	iinfo->i_lenExtents = 0;
....@@ -1736,8 +1729,12 @@
17361729 
17371730 	if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
17381731 		fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1739
-	else
1740
-		fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1732
+	else {
1733
+		if (iinfo->i_hidden)
1734
+			fe->fileLinkCount = cpu_to_le16(0);
1735
+		else
1736
+			fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1737
+	}
17411738 
17421739 	fe->informationLength = cpu_to_le64(inode->i_size);
17431740 
....@@ -1908,8 +1905,13 @@
19081905 	if (!inode)
19091906 		return ERR_PTR(-ENOMEM);
19101907 
1911
-	if (!(inode->i_state & I_NEW))
1908
+	if (!(inode->i_state & I_NEW)) {
1909
+		if (UDF_I(inode)->i_hidden != hidden_inode) {
1910
+			iput(inode);
1911
+			return ERR_PTR(-EFSCORRUPTED);
1912
+		}
19121913 		return inode;
1914
+	}
19131915 
19141916 	memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
19151917 	err = udf_read_inode(inode, hidden_inode);
....@@ -2223,12 +2225,13 @@
22232225 	return etype;
22242226 }
22252227 
2226
-static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2227
-			      struct kernel_lb_addr neloc, uint32_t nelen)
2228
+static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2229
+			   struct kernel_lb_addr neloc, uint32_t nelen)
22282230 {
22292231 	struct kernel_lb_addr oeloc;
22302232 	uint32_t oelen;
22312233 	int8_t etype;
2234
+	int err;
22322235 
22332236 	if (epos.bh)
22342237 		get_bh(epos.bh);
....@@ -2238,10 +2241,10 @@
22382241 		neloc = oeloc;
22392242 		nelen = (etype << 30) | oelen;
22402243 	}
2241
-	udf_add_aext(inode, &epos, &neloc, nelen, 1);
2244
+	err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
22422245 	brelse(epos.bh);
22432246 
2244
-	return (nelen >> 30);
2247
+	return err;
22452248 }
22462249 
22472250 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)