static int au_hfsn_handle_event(struct fsnotify_group *group,
struct fsnotify_mark *inode_mark,
struct fsnotify_mark *vfsmount_mark,
struct fsnotify_event *event)
{
int err;
struct au_hnotify *hnotify;
struct inode *h_dir, *h_inode;
__u32 mask;
struct qstr h_child_qstr = {
.name = event->file_name,
.len = event->name_len
};
AuDebugOn(event->data_type != FSNOTIFY_EVENT_INODE);
err = 0;
/* if FS_UNMOUNT happens, there must be another bug */
mask = event->mask;
AuDebugOn(mask & FS_UNMOUNT);
if (mask & (FS_IN_IGNORED | FS_UNMOUNT))
goto out;
h_dir = event->to_tell;
h_inode = event->inode;
#ifdef AuDbgHnotify
au_debug(1);
if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1
|| strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) {
AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n",
h_dir->i_ino, mask, au_hfsn_name(mask),
AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0);
/* WARN_ON(1); */
}
au_debug(0);
#endif
AuDebugOn(!inode_mark);
hnotify = container_of(inode_mark, struct au_hnotify, hn_mark);
err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode);
out:
return err;
}
/* isn't it waste to ask every registered 'group'? */
/* copied from linux/fs/notify/inotify/inotify_fsnotiry.c */
/* it should be exported to modules */
static bool au_hfsn_should_send_event(struct fsnotify_group *group,
struct inode *h_inode,
struct fsnotify_mark *inode_mark,
struct fsnotify_mark *vfsmount_mark,
__u32 mask, void *data, int data_type)
{
mask = (mask & ~FS_EVENT_ON_CHILD);
return inode_mark->mask & mask;
}
/*
* returns a negative dentry whose name is unique and temporary.
*/
struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
struct qstr *prefix)
{
struct dentry *dentry;
int i;
char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1],
*name, *p;
/* strict atomic_t is unnecessary here */
static unsigned short cnt;
struct qstr qs;
BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
name = defname;
qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1;
if (unlikely(prefix->len > DNAME_INLINE_LEN)) {
dentry = ERR_PTR(-ENAMETOOLONG);
if (unlikely(qs.len > NAME_MAX))
goto out;
dentry = ERR_PTR(-ENOMEM);
name = kmalloc(qs.len + 1, GFP_NOFS);
if (unlikely(!name))
goto out;
}
/* doubly whiteout-ed */
memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
p = name + AUFS_WH_PFX_LEN * 2;
memcpy(p, prefix->name, prefix->len);
p += prefix->len;
*p++ = '.';
AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
qs.name = name;
for (i = 0; i < 3; i++) {
sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++);
dentry = au_sio_lkup_one(&qs, h_parent, br);
if (IS_ERR(dentry) || !dentry->d_inode)
goto out_name;
dput(dentry);
}
/* pr_warn("could not get random name\n"); */
dentry = ERR_PTR(-EEXIST);
AuDbg("%.*s\n", AuLNPair(&qs));
BUG();
out_name:
if (name != defname)
kfree(name);
out:
AuTraceErrPtr(dentry);
return dentry;
}
struct dentry *vfsub__lookup_hash(struct qstr *name, struct dentry *parent,
struct nameidata *nd)
{
struct dentry *d;
LKTRTrace("%.*s/%.*s, nd %d\n",
AuDLNPair(parent), AuLNPair(name), !!nd);
if (nd)
LKTRTrace("nd{0x%x}\n", nd->flags);
IMustLock(parent->d_inode);
d = __lookup_hash(name, parent, nd);
if (!IS_ERR(d))
au_update_fuse_h_inode(NULL, d); /*ignore*/
return d;
}
