X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fext2%2Fsuper.c;h=75af3fbe838472268bc1f75d2061630a3c02b13a;hb=13f14b4d8be225cbb11ff2be7c048590a9ccf87b;hp=77bd5f9262f94c4e2da4a012c5f89b50af357dd1;hpb=2843483d2eb02ad104edbe8b2429fb6a39d25063;p=linux-2.6

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 77bd5f9262..75af3fbe83 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -234,16 +234,16 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
 	    le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
 		seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 	}
-	if (test_opt(sb, ERRORS_CONT)) {
+	if (test_opt(sb, ERRORS_RO)) {
 		int def_errors = le16_to_cpu(es->s_errors);
 
 		if (def_errors == EXT2_ERRORS_PANIC ||
-		    def_errors == EXT2_ERRORS_RO) {
-			seq_puts(seq, ",errors=continue");
+		    def_errors == EXT2_ERRORS_CONTINUE) {
+			seq_puts(seq, ",errors=remount-ro");
 		}
 	}
-	if (test_opt(sb, ERRORS_RO))
-		seq_puts(seq, ",errors=remount-ro");
+	if (test_opt(sb, ERRORS_CONT))
+		seq_puts(seq, ",errors=continue");
 	if (test_opt(sb, ERRORS_PANIC))
 		seq_puts(seq, ",errors=panic");
 	if (test_opt(sb, NO_UID32))
@@ -311,13 +311,10 @@ static const struct super_operations ext2_sops = {
 #endif
 };
 
-static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
+static struct inode *ext2_nfs_get_inode(struct super_block *sb,
+		u64 ino, u32 generation)
 {
-	__u32 *objp = vobjp;
-	unsigned long ino = objp[0];
-	__u32 generation = objp[1];
 	struct inode *inode;
-	struct dentry *result;
 
 	if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
 		return ERR_PTR(-ESTALE);
@@ -338,15 +335,21 @@ static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
 		iput(inode);
 		return ERR_PTR(-ESTALE);
 	}
-	/* now to find a dentry.
-	 * If possible, get a well-connected one
-	 */
-	result = d_alloc_anon(inode);
-	if (!result) {
-		iput(inode);
-		return ERR_PTR(-ENOMEM);
-	}
-	return result;
+	return inode;
+}
+
+static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
+		int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				    ext2_nfs_get_inode);
+}
+
+static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
+		int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				    ext2_nfs_get_inode);
 }
 
 /* Yes, most of these are left as NULL!!
@@ -354,9 +357,10 @@ static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
  * systems, but can be improved upon.
  * Currently only get_parent is required.
  */
-static struct export_operations ext2_export_ops = {
+static const struct export_operations ext2_export_ops = {
+	.fh_to_dentry = ext2_fh_to_dentry,
+	.fh_to_parent = ext2_fh_to_parent,
 	.get_parent = ext2_get_parent,
-	.get_dentry = ext2_get_dentry,
 };
 
 static unsigned long get_sb_block(void **data)
@@ -676,11 +680,31 @@ static int ext2_check_descriptors (struct super_block * sb)
 static loff_t ext2_max_size(int bits)
 {
 	loff_t res = EXT2_NDIR_BLOCKS;
-	/* This constant is calculated to be the largest file size for a
-	 * dense, 4k-blocksize file such that the total number of
+	int meta_blocks;
+	loff_t upper_limit;
+
+	/* This is calculated to be the largest file size for a
+	 * dense, file such that the total number of
 	 * sectors in the file, including data and all indirect blocks,
-	 * does not exceed 2^32. */
-	const loff_t upper_limit = 0x1ff7fffd000LL;
+	 * does not exceed 2^32 -1
+	 * __u32 i_blocks representing the total number of
+	 * 512 bytes blocks of the file
+	 */
+	upper_limit = (1LL << 32) - 1;
+
+	/* total blocks in file system block size */
+	upper_limit >>= (bits - 9);
+
+
+	/* indirect blocks */
+	meta_blocks = 1;
+	/* double indirect blocks */
+	meta_blocks += 1 + (1LL << (bits-2));
+	/* tripple indirect blocks */
+	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
+
+	upper_limit -= meta_blocks;
+	upper_limit <<= bits;
 
 	res += 1LL << (bits-2);
 	res += 1LL << (2*(bits-2));
@@ -688,6 +712,10 @@ static loff_t ext2_max_size(int bits)
 	res <<= bits;
 	if (res > upper_limit)
 		res = upper_limit;
+
+	if (res > MAX_LFS_FILESIZE)
+		res = MAX_LFS_FILESIZE;
+
 	return res;
 }
 
@@ -792,10 +820,10 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	
 	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
 		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
-	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
-		set_opt(sbi->s_mount_opt, ERRORS_RO);
-	else
+	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
 		set_opt(sbi->s_mount_opt, ERRORS_CONT);
+	else
+		set_opt(sbi->s_mount_opt, ERRORS_RO);
 
 	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
 	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
@@ -840,8 +868,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 
 	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
 
-	if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
-				  (sb->s_blocksize != blocksize))) {
+	if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
 		if (!silent)
 			printk("XIP: Unsupported blocksize\n");
 		goto failed_mount;