diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/notify/fdinfo.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c new file mode 100644 index 000000000..765b50aea --- /dev/null +++ b/fs/notify/fdinfo.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0 +#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/exportfs.h> + +#include "inotify/inotify.h" +#include "fdinfo.h" +#include "fsnotify.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, NULL); + 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->connector->type != FSNOTIFY_OBJ_TYPE_INODE) + return; + + inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); + inode = igrab(fsnotify_conn_inode(mark->connector)); + if (inode) { + seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ", + inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, + inotify_mark_user_mask(mark)); + 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_IGNORED_SURV_MODIFY) + mflags |= FAN_MARK_IGNORED_SURV_MODIFY; + + if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) { + inode = igrab(fsnotify_conn_inode(mark->connector)); + 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->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) { + struct mount *mnt = fsnotify_conn_mount(mark->connector); + + seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", + mnt->mnt_id, mflags, mark->mask, mark->ignored_mask); + } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) { + struct super_block *sb = fsnotify_conn_sb(mark->connector); + + seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n", + sb->s_dev, mflags, mark->mask, mark->ignored_mask); + } +} + +void fanotify_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct fsnotify_group *group = f->private_data; + + seq_printf(m, "fanotify flags:%x event-flags:%x\n", + group->fanotify_data.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 */ |