nfsd race fixes: ext4

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 08cac9f..6e60528 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -826,7 +826,10 @@ got:
        ext4_set_inode_flags(inode);
        if (IS_DIRSYNC(inode))
                handle->h_sync = 1;
-       insert_inode_hash(inode);
+       if (insert_inode_locked(inode) < 0) {
+               err = -EINVAL;
+               goto fail_drop;
+       }
        spin_lock(&sbi->s_next_gen_lock);
        inode->i_generation = sbi->s_next_generation++;
        spin_unlock(&sbi->s_next_gen_lock);
@@ -881,6 +884,7 @@ fail_drop:
        DQUOT_DROP(inode);
        inode->i_flags |= S_NOQUOTA;
        inode->i_nlink = 0;
+       unlock_new_inode(inode);
        iput(inode);
        brelse(bitmap_bh);
        return ERR_PTR(err);

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 63adcb7..da98a90 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1693,9 +1693,11 @@ static int ext4_add_nondir(handle_t *handle,
        if (!err) {
                ext4_mark_inode_dirty(handle, inode);
                d_instantiate(dentry, inode);
+               unlock_new_inode(inode);
                return 0;
        }
        drop_nlink(inode);
+       unlock_new_inode(inode);
        iput(inode);
        return err;
 }
@@ -1830,6 +1832,7 @@ retry:
        if (err) {
 out_clear_inode:
                clear_nlink(inode);
+               unlock_new_inode(inode);
                ext4_mark_inode_dirty(handle, inode);
                iput(inode);
                goto out_stop;
@@ -1838,6 +1841,7 @@ out_clear_inode:
        ext4_update_dx_flag(dir);
        ext4_mark_inode_dirty(handle, dir);
        d_instantiate(dentry, inode);
+       unlock_new_inode(inode);
 out_stop:
        ext4_journal_stop(handle);
        if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
@@ -2212,6 +2216,7 @@ retry:
                                mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
                if (err) {
                        clear_nlink(inode);
+                       unlock_new_inode(inode);
                        ext4_mark_inode_dirty(handle, inode);
                        iput(inode);
                        goto out_stop;
@@ -2262,7 +2267,14 @@ retry:
        ext4_inc_count(handle, inode);
        atomic_inc(&inode->i_count);
 
-       err = ext4_add_nondir(handle, dentry, inode);
+       err = ext4_add_entry(handle, dentry, inode);
+       if (!err) {
+               ext4_mark_inode_dirty(handle, inode);
+               d_instantiate(dentry, inode);
+       } else {
+               drop_nlink(inode);
+               iput(inode);
+       }
        ext4_journal_stop(handle);
        if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
                goto retry;