1 files changed, 93 insertions, 14 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3c1397f..4c8d31c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -523,7 +523,7 @@ static void ext4_destroy_inode(struct inode *inode)
 	kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
 }
 
-static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
+static void init_once(struct kmem_cache *cachep, void *foo)
 {
 	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
 
@@ -596,9 +596,80 @@ static inline void ext4_show_quota_options(struct seq_file *seq, struct super_bl
 #endif
 }
 
+/*
+ * Show an option if
+ *  - it's set to a non-default value OR
+ *  - if the per-sb default is different from the global default
+ */
 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
 {
 	struct super_block *sb = vfs->mnt_sb;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	struct ext4_super_block *es = sbi->s_es;
+	unsigned long def_mount_opts;
+
+	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+
+	if (sbi->s_sb_block != 1)
+		seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
+	if (test_opt(sb, MINIX_DF))
+		seq_puts(seq, ",minixdf");
+	if (test_opt(sb, GRPID))
+		seq_puts(seq, ",grpid");
+	if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
+		seq_puts(seq, ",nogrpid");
+	if (sbi->s_resuid != EXT4_DEF_RESUID ||
+	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
+		seq_printf(seq, ",resuid=%u", sbi->s_resuid);
+	}
+	if (sbi->s_resgid != EXT4_DEF_RESGID ||
+	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
+		seq_printf(seq, ",resgid=%u", sbi->s_resgid);
+	}
+	if (test_opt(sb, ERRORS_CONT)) {
+		int def_errors = le16_to_cpu(es->s_errors);
+
+		if (def_errors == EXT4_ERRORS_PANIC ||
+		    def_errors == EXT4_ERRORS_RO) {
+			seq_puts(seq, ",errors=continue");
+		}
+	}
+	if (test_opt(sb, ERRORS_RO))
+		seq_puts(seq, ",errors=remount-ro");
+	if (test_opt(sb, ERRORS_PANIC))
+		seq_puts(seq, ",errors=panic");
+	if (test_opt(sb, NO_UID32))
+		seq_puts(seq, ",nouid32");
+	if (test_opt(sb, DEBUG))
+		seq_puts(seq, ",debug");
+	if (test_opt(sb, OLDALLOC))
+		seq_puts(seq, ",oldalloc");
+#ifdef CONFIG_EXT4_FS_XATTR
+	if (test_opt(sb, XATTR_USER))
+		seq_puts(seq, ",user_xattr");
+	if (!test_opt(sb, XATTR_USER) &&
+	    (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
+		seq_puts(seq, ",nouser_xattr");
+	}
+#endif
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+	if (test_opt(sb, POSIX_ACL))
+		seq_puts(seq, ",acl");
+	if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
+		seq_puts(seq, ",noacl");
+#endif
+	if (!test_opt(sb, RESERVATION))
+		seq_puts(seq, ",noreservation");
+	if (sbi->s_commit_interval) {
+		seq_printf(seq, ",commit=%u",
+			   (unsigned) (sbi->s_commit_interval / HZ));
+	}
+	if (test_opt(sb, BARRIER))
+		seq_puts(seq, ",barrier=1");
+	if (test_opt(sb, NOBH))
+		seq_puts(seq, ",nobh");
+	if (!test_opt(sb, EXTENTS))
+		seq_puts(seq, ",noextents");
 
 	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
 		seq_puts(seq, ",data=journal");
@@ -1415,8 +1486,6 @@ static void ext4_orphan_cleanup (struct super_block * sb,
 	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
 }
 
-#define log2(n) ffz(~(n))
-
 /*
  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
@@ -1479,6 +1548,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	int needs_recovery;
 	__le32 features;
 	__u64 blocks_count;
+	int err;
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
@@ -1487,6 +1557,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	sbi->s_mount_opt = 0;
 	sbi->s_resuid = EXT4_DEF_RESUID;
 	sbi->s_resgid = EXT4_DEF_RESGID;
+	sbi->s_sb_block = sb_block;
 
 	unlock_kernel();
 
@@ -1667,7 +1738,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
 		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
 		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
-		    sbi->s_desc_size & (sbi->s_desc_size - 1)) {
+		    !is_power_of_2(sbi->s_desc_size)) {
 			printk(KERN_ERR
 			       "EXT4-fs: unsupported descriptor size %lu\n",
 			       sbi->s_desc_size);
@@ -1688,8 +1759,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
 	sbi->s_sbh = bh;
 	sbi->s_mount_state = le16_to_cpu(es->s_state);
-	sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
-	sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
+	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
+	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
 	for (i=0; i < 4; i++)
 		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
 	sbi->s_def_hash_version = es->s_def_hash_version;
@@ -1759,12 +1830,20 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 	spin_lock_init(&sbi->s_next_gen_lock);
 
-	percpu_counter_init(&sbi->s_freeblocks_counter,
-		ext4_count_free_blocks(sb));
-	percpu_counter_init(&sbi->s_freeinodes_counter,
-		ext4_count_free_inodes(sb));
-	percpu_counter_init(&sbi->s_dirs_counter,
-		ext4_count_dirs(sb));
+	err = percpu_counter_init(&sbi->s_freeblocks_counter,
+			ext4_count_free_blocks(sb));
+	if (!err) {
+		err = percpu_counter_init(&sbi->s_freeinodes_counter,
+				ext4_count_free_inodes(sb));
+	}
+	if (!err) {
+		err = percpu_counter_init(&sbi->s_dirs_counter,
+				ext4_count_dirs(sb));
+	}
+	if (err) {
+		printk(KERN_ERR "EXT4-fs: insufficient memory\n");
+		goto failed_mount3;
+	}
 
 	/* per fileystem reservation list head & lock */
 	spin_lock_init(&sbi->s_rsv_window_lock);
@@ -2592,13 +2671,13 @@ static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
 	buf->f_type = EXT4_SUPER_MAGIC;
 	buf->f_bsize = sb->s_blocksize;
 	buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
-	buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
+	buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
 	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
 	buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
 	if (buf->f_bfree < ext4_r_blocks_count(es))
 		buf->f_bavail = 0;
 	buf->f_files = le32_to_cpu(es->s_inodes_count);
-	buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
+	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
 	es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
 	buf->f_namelen = EXT4_NAME_LEN;
 	fsid = le64_to_cpup((void *)es->s_uuid) ^