Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull ext[23], udf and quota fixes from Jan Kara:
 "Assorted fixes in quota, ext2, ext3 & udf.

  Probably the most important is a fix of fs corruption issue in ext2
  XIP support (OTOH xip is rarely used)"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ext2: Fix fs corruption in ext2_get_xip_mem()
  quota: info leak in quota_getquota()
  jbd: Revert "jbd: remove dependency on __GFP_NOFAIL"
  udf: fix for pathetic mount times in case of invalid file system
  ext3: Count journal as bsddf overhead in ext3_statfs

fs/ext2/inode.c

@@ -632,6 +632,8 @@ static int ext2_get_blocks(struct inode *inode,
 	int count = 0;
 	ext2_fsblk_t first_block = 0;
 
+	BUG_ON(maxblocks == 0);
+
 	depth = ext2_block_to_path(inode,iblock,offsets,&blocks_to_boundary);
 
 	if (depth == 0)

fs/ext2/xip.c

@@ -35,6 +35,7 @@ __ext2_get_block(struct inode *inode, pgoff_t pgoff, int create,
 	int rc;
 
 	memset(&tmp, 0, sizeof(struct buffer_head));
+	tmp.b_size = 1 << inode->i_blkbits;
 	rc = ext2_get_block(inode, pgoff, &tmp, create);
 	*result = tmp.b_blocknr;
 

fs/ext3/super.c

@@ -2825,6 +2825,10 @@ static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
 		 * bitmap, and an inode table.
 		 */
 		overhead += ngroups * (2 + sbi->s_itb_per_group);
+
+		/* Add the journal blocks as well */
+                overhead += sbi->s_journal->j_maxlen;
+
 		sbi->s_overhead_last = overhead;
 		smp_wmb();
 		sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);

fs/jbd/transaction.c

@@ -26,7 +26,6 @@
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/hrtimer.h>
-#include <linux/backing-dev.h>
 
 static void __journal_temp_unlink_buffer(struct journal_head *jh);
 
@@ -100,10 +99,11 @@ static int start_this_handle(journal_t *journal, handle_t *handle)
 
 alloc_transaction:
 	if (!journal->j_running_transaction) {
-		new_transaction = kzalloc(sizeof(*new_transaction), GFP_NOFS);
+		new_transaction = kzalloc(sizeof(*new_transaction),
+						GFP_NOFS|__GFP_NOFAIL);
 		if (!new_transaction) {
-			congestion_wait(BLK_RW_ASYNC, HZ/50);
+			ret = -ENOMEM;
-			goto alloc_transaction;
+			goto out;
 		}
 	}
 

fs/quota/quota.c

@@ -117,6 +117,7 @@ static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
 
 static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
 {
+	memset(dst, 0, sizeof(*dst));
 	dst->dqb_bhardlimit = src->d_blk_hardlimit;
 	dst->dqb_bsoftlimit = src->d_blk_softlimit;
 	dst->dqb_curspace = src->d_bcount;

fs/udf/super.c

@@ -76,6 +76,9 @@
 
 #define UDF_DEFAULT_BLOCKSIZE 2048
 
+#define VSD_FIRST_SECTOR_OFFSET		32768
+#define VSD_MAX_SECTOR_OFFSET		0x800000
+
 enum { UDF_MAX_LINKS = 0xffff };
 
 /* These are the "meat" - everything else is stuffing */
@@ -685,7 +688,7 @@ out_unlock:
 static loff_t udf_check_vsd(struct super_block *sb)
 {
 	struct volStructDesc *vsd = NULL;
-	loff_t sector = 32768;
+	loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 	int sectorsize;
 	struct buffer_head *bh = NULL;
 	int nsr02 = 0;
@@ -703,8 +706,18 @@ static loff_t udf_check_vsd(struct super_block *sb)
 	udf_debug("Starting at sector %u (%ld byte sectors)\n",
 		  (unsigned int)(sector >> sb->s_blocksize_bits),
 		  sb->s_blocksize);
-	/* Process the sequence (if applicable) */
+	/* Process the sequence (if applicable). The hard limit on the sector
-	for (; !nsr02 && !nsr03; sector += sectorsize) {
+	 * offset is arbitrary, hopefully large enough so that all valid UDF
+	 * filesystems will be recognised. There is no mention of an upper
+	 * bound to the size of the volume recognition area in the standard.
+	 *  The limit will prevent the code to read all the sectors of a
+	 * specially crafted image (like a bluray disc full of CD001 sectors),
+	 * potentially causing minutes or even hours of uninterruptible I/O
+	 * activity. This actually happened with uninitialised SSD partitions
+	 * (all 0xFF) before the check for the limit and all valid IDs were
+	 * added */
+	for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
+	     sector += sectorsize) {
 		/* Read a block */
 		bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 		if (!bh)
@@ -714,10 +727,7 @@ static loff_t udf_check_vsd(struct super_block *sb)
 		vsd = (struct volStructDesc *)(bh->b_data +
 					      (sector & (sb->s_blocksize - 1)));
 
-		if (vsd->stdIdent[0] == 0) {
+		if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
-			brelse(bh);
-			break;
-		} else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 				    VSD_STD_ID_LEN)) {
 			switch (vsd->structType) {
 			case 0:
@@ -753,6 +763,17 @@ static loff_t udf_check_vsd(struct super_block *sb)
 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 				    VSD_STD_ID_LEN))
 			nsr03 = sector;
+		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
+				    VSD_STD_ID_LEN))
+			; /* nothing */
+		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
+				    VSD_STD_ID_LEN))
+			; /* nothing */
+		else {
+			/* invalid id : end of volume recognition area */
+			brelse(bh);
+			break;
+		}
 		brelse(bh);
 	}
 
@@ -760,7 +781,8 @@ static loff_t udf_check_vsd(struct super_block *sb)
 		return nsr03;
 	else if (nsr02)
 		return nsr02;
-	else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
+	else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
+			VSD_FIRST_SECTOR_OFFSET)
 		return -1;
 	else
 		return 0;
@@ -1270,6 +1292,9 @@ static int udf_load_partdesc(struct super_block *sb, sector_t block)
 	 * PHYSICAL partitions are already set up
 	 */
 	type1_idx = i;
+#ifdef UDFFS_DEBUG
+	map = NULL; /* supress 'maybe used uninitialized' warning */
+#endif
 	for (i = 0; i < sbi->s_partitions; i++) {
 		map = &sbi->s_partmaps[i];
 
@@ -1891,7 +1916,9 @@ static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
 			return 0;
 		}
 		if (nsr_off == -1)
-			udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
+			udf_debug("Failed to read sector at offset %d. "
+				  "Assuming open disc. Skipping validity "
+				  "check\n", VSD_FIRST_SECTOR_OFFSET);
 		if (!sbi->s_last_block)
 			sbi->s_last_block = udf_get_last_block(sb);
 	} else {