X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fext2%2Fsuper.c;h=4286ff6330b6a0b006ca159e5041b6e75ed2075b;hb=14d1adfc59ba66932ef167fdff62983e7c2b0197;hp=9f43879d6d68dd7dd859eb331b988c7f3e6fb754;hpb=6ab3d5624e172c553004ecc862bfeac16d9d68b7;p=pandora-kernel.git

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 9f43879d6d68..4286ff6330b6 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -251,6 +251,44 @@ static struct super_operations ext2_sops = {
 #endif
 };
 
+static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
+{
+	__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);
+	if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
+		return ERR_PTR(-ESTALE);
+
+	/* iget isn't really right if the inode is currently unallocated!!
+	 * ext2_read_inode currently does appropriate checks, but
+	 * it might be "neater" to call ext2_get_inode first and check
+	 * if the inode is valid.....
+	 */
+	inode = iget(sb, ino);
+	if (inode == NULL)
+		return ERR_PTR(-ENOMEM);
+	if (is_bad_inode(inode) ||
+	    (generation && inode->i_generation != generation)) {
+		/* we didn't find the right inode.. */
+		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;
+}
+
 /* Yes, most of these are left as NULL!!
  * A NULL value implies the default, which works with ext2-like file
  * systems, but can be improved upon.
@@ -258,6 +296,7 @@ static struct super_operations ext2_sops = {
  */
 static struct export_operations ext2_export_ops = {
 	.get_parent = ext2_get_parent,
+	.get_dentry = ext2_get_dentry,
 };
 
 static unsigned long get_sb_block(void **data)
@@ -775,7 +814,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	if (EXT2_INODE_SIZE(sb) == 0)
 		goto cantfind_ext2;
 	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
-	if (sbi->s_inodes_per_block == 0)
+	if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
 		goto cantfind_ext2;
 	sbi->s_itb_per_group = sbi->s_inodes_per_group /
 					sbi->s_inodes_per_block;
@@ -1044,7 +1083,6 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
 	unsigned long overhead;
 	int i;
 
-	lock_super(sb);
 	if (test_opt (sb, MINIX_DF))
 		overhead = 0;
 	else {
@@ -1085,7 +1123,6 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
 	buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
 	buf->f_ffree = ext2_count_free_inodes (sb);
 	buf->f_namelen = EXT2_NAME_LEN;
-	unlock_super(sb);
 	return 0;
 }
 
@@ -1157,7 +1194,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
 	struct buffer_head tmp_bh;
 	struct buffer_head *bh;
 
-	mutex_lock(&inode->i_mutex);
+	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
 	while (towrite > 0) {
 		tocopy = sb->s_blocksize - offset < towrite ?
 				sb->s_blocksize - offset : towrite;