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79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
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#include <linux/fdtable.h>
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#include <linux/fsnotify_backend.h>
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#include <linux/init.h>
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#include <linux/kernel.h> /* UINT_MAX */
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#include <linux/types.h>
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#include "fanotify.h"
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static int fanotify_handle_event(struct fsnotify_group *group, struct fsnotify_event *event)
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{
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int ret;
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BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
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BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
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BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
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BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
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BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
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BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
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BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
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pr_debug("%s: group=%p event=%p\n", __func__, group, event);
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ret = fsnotify_add_notify_event(group, event, NULL, NULL);
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return ret;
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}
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static bool fanotify_should_send_event(struct fsnotify_group *group, struct inode *inode,
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struct vfsmount *mnt, __u32 mask, void *data,
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int data_type)
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{
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struct fsnotify_mark *fsn_mark;
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bool send;
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pr_debug("%s: group=%p inode=%p mask=%x data=%p data_type=%d\n",
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__func__, group, inode, mask, data, data_type);
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/* sorry, fanotify only gives a damn about files and dirs */
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if (!S_ISREG(inode->i_mode) &&
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!S_ISDIR(inode->i_mode))
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return false;
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/* if we don't have enough info to send an event to userspace say no */
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if (data_type != FSNOTIFY_EVENT_PATH)
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return false;
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fsn_mark = fsnotify_find_mark(group, inode);
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if (!fsn_mark)
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return false;
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/* if the event is for a child and this inode doesn't care about
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* events on the child, don't send it! */
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if ((mask & FS_EVENT_ON_CHILD) &&
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!(fsn_mark->mask & FS_EVENT_ON_CHILD)) {
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send = false;
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} else {
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/*
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* We care about children, but do we care about this particular
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* type of event?
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*/
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mask = (mask & ~FS_EVENT_ON_CHILD);
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send = (fsn_mark->mask & mask);
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}
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/* find took a reference */
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fsnotify_put_mark(fsn_mark);
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return send;
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}
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const struct fsnotify_ops fanotify_fsnotify_ops = {
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.handle_event = fanotify_handle_event,
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.should_send_event = fanotify_should_send_event,
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.free_group_priv = NULL,
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.free_event_priv = NULL,
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.freeing_mark = NULL,
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};
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