![Andrey Vagin](/assets/img/avatar_default.png)
Currently we handle only ENOSPC. In case of other errors the file_handle variable isn't filled properly and we will show a part of stack. Signed-off-by: Andrey Vagin <avagin@openvz.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
180 lines
4.2 KiB
C
180 lines
4.2 KiB
C
#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/fsnotify_backend.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/inotify.h>
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#include <linux/fanotify.h>
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#include <linux/kernel.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/exportfs.h>
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#include "inotify/inotify.h"
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#include "../fs/mount.h"
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#if defined(CONFIG_PROC_FS)
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#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
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static int show_fdinfo(struct seq_file *m, struct file *f,
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int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
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{
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struct fsnotify_group *group = f->private_data;
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struct fsnotify_mark *mark;
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int ret = 0;
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mutex_lock(&group->mark_mutex);
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list_for_each_entry(mark, &group->marks_list, g_list) {
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ret = show(m, mark);
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if (ret)
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break;
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}
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mutex_unlock(&group->mark_mutex);
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return ret;
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}
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#if defined(CONFIG_EXPORTFS)
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static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
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{
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struct {
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struct file_handle handle;
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u8 pad[MAX_HANDLE_SZ];
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} f;
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int size, ret, i;
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f.handle.handle_bytes = sizeof(f.pad);
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size = f.handle.handle_bytes >> 2;
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ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
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if ((ret == FILEID_INVALID) || (ret < 0)) {
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WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
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return 0;
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}
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f.handle.handle_type = ret;
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f.handle.handle_bytes = size * sizeof(u32);
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ret = seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
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f.handle.handle_bytes, f.handle.handle_type);
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for (i = 0; i < f.handle.handle_bytes; i++)
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ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
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return ret;
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}
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#else
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static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_INOTIFY_USER
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static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
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{
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struct inotify_inode_mark *inode_mark;
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struct inode *inode;
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int ret = 0;
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if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
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return 0;
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inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
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inode = igrab(mark->i.inode);
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if (inode) {
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ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
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"mask:%x ignored_mask:%x ",
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inode_mark->wd, inode->i_ino,
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inode->i_sb->s_dev,
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mark->mask, mark->ignored_mask);
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ret |= show_mark_fhandle(m, inode);
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ret |= seq_putc(m, '\n');
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iput(inode);
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}
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return ret;
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}
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int inotify_show_fdinfo(struct seq_file *m, struct file *f)
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{
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return show_fdinfo(m, f, inotify_fdinfo);
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}
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#endif /* CONFIG_INOTIFY_USER */
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#ifdef CONFIG_FANOTIFY
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static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
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{
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unsigned int mflags = 0;
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struct inode *inode;
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int ret = 0;
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if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
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return 0;
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if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
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mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
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if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
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inode = igrab(mark->i.inode);
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if (!inode)
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goto out;
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ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
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"mflags:%x mask:%x ignored_mask:%x ",
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inode->i_ino, inode->i_sb->s_dev,
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mflags, mark->mask, mark->ignored_mask);
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ret |= show_mark_fhandle(m, inode);
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ret |= seq_putc(m, '\n');
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iput(inode);
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} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
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struct mount *mnt = real_mount(mark->m.mnt);
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ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x "
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"ignored_mask:%x\n", mnt->mnt_id, mflags,
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mark->mask, mark->ignored_mask);
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}
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out:
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return ret;
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}
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int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
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{
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struct fsnotify_group *group = f->private_data;
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unsigned int flags = 0;
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switch (group->priority) {
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case FS_PRIO_0:
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flags |= FAN_CLASS_NOTIF;
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break;
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case FS_PRIO_1:
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flags |= FAN_CLASS_CONTENT;
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break;
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case FS_PRIO_2:
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flags |= FAN_CLASS_PRE_CONTENT;
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break;
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}
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if (group->max_events == UINT_MAX)
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flags |= FAN_UNLIMITED_QUEUE;
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if (group->fanotify_data.max_marks == UINT_MAX)
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flags |= FAN_UNLIMITED_MARKS;
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seq_printf(m, "fanotify flags:%x event-flags:%x\n",
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flags, group->fanotify_data.f_flags);
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return show_fdinfo(m, f, fanotify_fdinfo);
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}
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#endif /* CONFIG_FANOTIFY */
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#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
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#endif /* CONFIG_PROC_FS */
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