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autofs_lookup(): hold ->d_lock over playing with ->d_flags 

... as well as setting ->d_fsdata, etc.  Make all of that
atomic.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-07-27 10:03:14 -04:00
parent c4931db9b0
commit 5f68056ca5
1 changed files with 7 additions and 6 deletions
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13
fs/autofs/root.c
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@ -504,21 +504,22 @@ static struct dentry *autofs_lookup(struct inode *dir,
if (!autofs_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
return ERR_PTR(-ENOENT);
/* Mark entries in the root as mount triggers */
if (IS_ROOT(dentry->d_parent) &&
autofs_type_indirect(sbi->type))
__managed_dentry_set_managed(dentry);
ino = autofs_new_ino(sbi);
if (!ino)
return ERR_PTR(-ENOMEM);
spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
/* Mark entries in the root as mount triggers */
if (IS_ROOT(dentry->d_parent) &&
autofs_type_indirect(sbi->type))
__managed_dentry_set_managed(dentry);
dentry->d_fsdata = ino;
ino->dentry = dentry;
spin_lock(&sbi->lookup_lock);
list_add(&ino->active, &sbi->active_list);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dentry->d_lock);
}
return NULL;
}