Add partial support for large (>4GB) files on ext2 filesystems. This

support is partial in that it will refuse to create large files on
filesystems that haven't been upgraded to EXT2_DYN_REV or that don't
have the EXT2_FEATURE_RO_COMPAT_LARGE_FILE flag set in the superblock.

MFC after:	2 weeks

6 files changed, 32 insertions, 2 deletions

diff --git a/sys/gnu/ext2fs/ext2_fs.h b/sys/gnu/ext2fs/ext2_fs.h
index 2943593..4c9466d 100644
--- a/sys/gnu/ext2fs/ext2_fs.h
+++ b/sys/gnu/ext2fs/ext2_fs.h
@@ -486,7 +486,8 @@ struct ext2_super_block {
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 #else
-#define EXT2_FEATURE_RO_COMPAT_SUPP	EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
+#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
+					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
 #endif
 
 /*
diff --git a/sys/gnu/ext2fs/ext2_inode.c b/sys/gnu/ext2fs/ext2_inode.c
index ec7215e..d940a5c 100644
--- a/sys/gnu/ext2fs/ext2_inode.c
+++ b/sys/gnu/ext2fs/ext2_inode.c
@@ -164,6 +164,16 @@ printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length);
 	 * value of oszie is 0, length will be at least 1.
 	 */
 	if (osize < length) {
+		/*
+		 * XXX Refuse to extend files past 2GB on old format
+		 * filesystems or ones that don't already have the
+		 * large file flag set in the superblock.
+		 */
+		if (osize < 0x8000000 && length >= 0x80000000 &&
+		    (oip->i_e2fs->s_es->s_rev_level == EXT2_GOOD_OLD_REV ||
+		    (oip->i_e2fs->s_es->s_feature_ro_compat &
+		    EXT2_FEATURE_RO_COMPAT_LARGE_FILE) == 0))
+			return (EFBIG);
 		offset = blkoff(fs, length - 1);
 		lbn = lblkno(fs, length - 1);
 		aflags = B_CLRBUF;
diff --git a/sys/gnu/ext2fs/ext2_inode_cnv.c b/sys/gnu/ext2fs/ext2_inode_cnv.c
index d64e549..12b5f4a 100644
--- a/sys/gnu/ext2fs/ext2_inode_cnv.c
+++ b/sys/gnu/ext2fs/ext2_inode_cnv.c
@@ -77,6 +77,8 @@ ext2_ei2i(ei, ip)
 	*/
 	ip->i_mode = ei->i_links_count ? ei->i_mode : 0;
 	ip->i_size = ei->i_size;
+	if (S_ISREG(ip->i_mode))
+		ip->i_size |= ((u_int64_t)ei->i_size_high) << 32;
 	ip->i_atime = ei->i_atime;
 	ip->i_mtime = ei->i_mtime;
 	ip->i_ctime = ei->i_ctime;
@@ -112,6 +114,8 @@ ext2_i2ei(ip, ei)
 	 */
 	ei->i_dtime = ei->i_links_count ? 0 : ip->i_mtime;
 	ei->i_size = ip->i_size;
+	if (S_ISREG(ip->i_mode))
+		ei->i_size_high = ip->i_size >> 32;
 	ei->i_atime = ip->i_atime;
 	ei->i_mtime = ip->i_mtime;
 	ei->i_ctime = ip->i_ctime;
diff --git a/sys/gnu/fs/ext2fs/ext2_fs.h b/sys/gnu/fs/ext2fs/ext2_fs.h
index 2943593..4c9466d 100644
--- a/sys/gnu/fs/ext2fs/ext2_fs.h
+++ b/sys/gnu/fs/ext2fs/ext2_fs.h
@@ -486,7 +486,8 @@ struct ext2_super_block {
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 #else
-#define EXT2_FEATURE_RO_COMPAT_SUPP	EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
+#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
+					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
 #endif
 
 /*
diff --git a/sys/gnu/fs/ext2fs/ext2_inode.c b/sys/gnu/fs/ext2fs/ext2_inode.c
index ec7215e..d940a5c 100644
--- a/sys/gnu/fs/ext2fs/ext2_inode.c
+++ b/sys/gnu/fs/ext2fs/ext2_inode.c
@@ -164,6 +164,16 @@ printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length);
 	 * value of oszie is 0, length will be at least 1.
 	 */
 	if (osize < length) {
+		/*
+		 * XXX Refuse to extend files past 2GB on old format
+		 * filesystems or ones that don't already have the
+		 * large file flag set in the superblock.
+		 */
+		if (osize < 0x8000000 && length >= 0x80000000 &&
+		    (oip->i_e2fs->s_es->s_rev_level == EXT2_GOOD_OLD_REV ||
+		    (oip->i_e2fs->s_es->s_feature_ro_compat &
+		    EXT2_FEATURE_RO_COMPAT_LARGE_FILE) == 0))
+			return (EFBIG);
 		offset = blkoff(fs, length - 1);
 		lbn = lblkno(fs, length - 1);
 		aflags = B_CLRBUF;
diff --git a/sys/gnu/fs/ext2fs/ext2_inode_cnv.c b/sys/gnu/fs/ext2fs/ext2_inode_cnv.c
index d64e549..12b5f4a 100644
--- a/sys/gnu/fs/ext2fs/ext2_inode_cnv.c
+++ b/sys/gnu/fs/ext2fs/ext2_inode_cnv.c
@@ -77,6 +77,8 @@ ext2_ei2i(ei, ip)
 	*/
 	ip->i_mode = ei->i_links_count ? ei->i_mode : 0;
 	ip->i_size = ei->i_size;
+	if (S_ISREG(ip->i_mode))
+		ip->i_size |= ((u_int64_t)ei->i_size_high) << 32;
 	ip->i_atime = ei->i_atime;
 	ip->i_mtime = ei->i_mtime;
 	ip->i_ctime = ei->i_ctime;
@@ -112,6 +114,8 @@ ext2_i2ei(ip, ei)
 	 */
 	ei->i_dtime = ei->i_links_count ? 0 : ip->i_mtime;
 	ei->i_size = ip->i_size;
+	if (S_ISREG(ip->i_mode))
+		ei->i_size_high = ip->i_size >> 32;
 	ei->i_atime = ip->i_atime;
 	ei->i_mtime = ip->i_mtime;
 	ei->i_ctime = ip->i_ctime;