write_inode_now(): avoid unnecessary synchronous write

[linux-2.6-omap-h63xx.git] / fs / ext4 / inode.c

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0e9055cf700e606f1aacb5432b8744a810242e11..f4e3874522465cb52324fa7d317dbc2a11e83fb4 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2680,21 +2680,31 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
        }
 }
 
-void ext4_read_inode(struct inode * inode)
+struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 {
        struct ext4_iloc iloc;
        struct ext4_inode *raw_inode;
-       struct ext4_inode_info *ei = EXT4_I(inode);
+       struct ext4_inode_info *ei;
        struct buffer_head *bh;
+       struct inode *inode;
+       long ret;
        int block;
 
+       inode = iget_locked(sb, ino);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+       if (!(inode->i_state & I_NEW))
+               return inode;
+
+       ei = EXT4_I(inode);
 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
        ei->i_acl = EXT4_ACL_NOT_CACHED;
        ei->i_default_acl = EXT4_ACL_NOT_CACHED;
 #endif
        ei->i_block_alloc_info = NULL;
 
-       if (__ext4_get_inode_loc(inode, &iloc, 0))
+       ret = __ext4_get_inode_loc(inode, &iloc, 0);
+       if (ret < 0)
                goto bad_inode;
        bh = iloc.bh;
        raw_inode = ext4_raw_inode(&iloc);
@@ -2720,6 +2730,7 @@ void ext4_read_inode(struct inode * inode)
                    !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) {
                        /* this inode is deleted */
                        brelse (bh);
+                       ret = -ESTALE;
                        goto bad_inode;
                }
                /* The only unlinked inodes we let through here have
@@ -2758,6 +2769,7 @@ void ext4_read_inode(struct inode * inode)
                if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize >
                    EXT4_INODE_SIZE(inode->i_sb)) {
                        brelse (bh);
+                       ret = -EIO;
                        goto bad_inode;
                }
                if (ei->i_extra_isize == 0) {
@@ -2811,11 +2823,12 @@ void ext4_read_inode(struct inode * inode)
        }
        brelse (iloc.bh);
        ext4_set_inode_flags(inode);
-       return;
+       unlock_new_inode(inode);
+       return inode;
 
 bad_inode:
-       make_bad_inode(inode);
-       return;
+       iget_failed(inode);
+       return ERR_PTR(ret);
 }
 
 static int ext4_inode_blocks_set(handle_t *handle,