Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / notify / fdinfo.c

diff --git a/kernel/fs/notify/fdinfo.c b/kernel/fs/notify/fdinfo.c
new file mode 100644 (file)
index 0000000..58b7cdb
--- /dev/null
+++ b/kernel/fs/notify/fdinfo.c
@@ -0,0 +1,165 @@
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fsnotify_backend.h>
+#include <linux/idr.h>
+#include <linux/init.h>
+#include <linux/inotify.h>
+#include <linux/fanotify.h>
+#include <linux/kernel.h>
+#include <linux/namei.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/exportfs.h>
+
+#include "inotify/inotify.h"
+#include "../fs/mount.h"
+
+#if defined(CONFIG_PROC_FS)
+
+#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
+
+static void show_fdinfo(struct seq_file *m, struct file *f,
+                       void (*show)(struct seq_file *m,
+                                    struct fsnotify_mark *mark))
+{
+       struct fsnotify_group *group = f->private_data;
+       struct fsnotify_mark *mark;
+
+       mutex_lock(&group->mark_mutex);
+       list_for_each_entry(mark, &group->marks_list, g_list) {
+               show(m, mark);
+               if (seq_has_overflowed(m))
+                       break;
+       }
+       mutex_unlock(&group->mark_mutex);
+}
+
+#if defined(CONFIG_EXPORTFS)
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
+{
+       struct {
+               struct file_handle handle;
+               u8 pad[MAX_HANDLE_SZ];
+       } f;
+       int size, ret, i;
+
+       f.handle.handle_bytes = sizeof(f.pad);
+       size = f.handle.handle_bytes >> 2;
+
+       ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
+       if ((ret == FILEID_INVALID) || (ret < 0)) {
+               WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
+               return;
+       }
+
+       f.handle.handle_type = ret;
+       f.handle.handle_bytes = size * sizeof(u32);
+
+       seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
+                  f.handle.handle_bytes, f.handle.handle_type);
+
+       for (i = 0; i < f.handle.handle_bytes; i++)
+               seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
+}
+#else
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
+{
+}
+#endif
+
+#ifdef CONFIG_INOTIFY_USER
+
+static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+{
+       struct inotify_inode_mark *inode_mark;
+       struct inode *inode;
+
+       if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
+               return;
+
+       inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
+       inode = igrab(mark->inode);
+       if (inode) {
+               seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
+                          inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
+                          mark->mask, mark->ignored_mask);
+               show_mark_fhandle(m, inode);
+               seq_putc(m, '\n');
+               iput(inode);
+       }
+}
+
+void inotify_show_fdinfo(struct seq_file *m, struct file *f)
+{
+       show_fdinfo(m, f, inotify_fdinfo);
+}
+
+#endif /* CONFIG_INOTIFY_USER */
+
+#ifdef CONFIG_FANOTIFY
+
+static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+{
+       unsigned int mflags = 0;
+       struct inode *inode;
+
+       if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
+               return;
+
+       if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
+               mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
+
+       if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
+               inode = igrab(mark->inode);
+               if (!inode)
+                       return;
+               seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
+                          inode->i_ino, inode->i_sb->s_dev,
+                          mflags, mark->mask, mark->ignored_mask);
+               show_mark_fhandle(m, inode);
+               seq_putc(m, '\n');
+               iput(inode);
+       } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
+               struct mount *mnt = real_mount(mark->mnt);
+
+               seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
+                          mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
+       }
+}
+
+void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
+{
+       struct fsnotify_group *group = f->private_data;
+       unsigned int flags = 0;
+
+       switch (group->priority) {
+       case FS_PRIO_0:
+               flags |= FAN_CLASS_NOTIF;
+               break;
+       case FS_PRIO_1:
+               flags |= FAN_CLASS_CONTENT;
+               break;
+       case FS_PRIO_2:
+               flags |= FAN_CLASS_PRE_CONTENT;
+               break;
+       }
+
+       if (group->max_events == UINT_MAX)
+               flags |= FAN_UNLIMITED_QUEUE;
+
+       if (group->fanotify_data.max_marks == UINT_MAX)
+               flags |= FAN_UNLIMITED_MARKS;
+
+       seq_printf(m, "fanotify flags:%x event-flags:%x\n",
+                  flags, group->fanotify_data.f_flags);
+
+       show_fdinfo(m, f, fanotify_fdinfo);
+}
+
+#endif /* CONFIG_FANOTIFY */
+
+#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
+
+#endif /* CONFIG_PROC_FS */