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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 20:58:12 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 20:58:12 -0800 |
commit | 848b81415c42ff3dc9a4204749087b015c37ef66 (patch) | |
tree | 391da3a73aea48632248220d2d6b8d45a88f7eae /fs/notify/fdinfo.c | |
parent | 992956189de58cae9f2be40585bc25105cd7c5ad (diff) | |
parent | 6fd59a83b9261fa53eaf98fb5514abba504a3ea3 (diff) | |
download | op-kernel-dev-848b81415c42ff3dc9a4204749087b015c37ef66.zip op-kernel-dev-848b81415c42ff3dc9a4204749087b015c37ef66.tar.gz |
Merge branch 'akpm' (Andrew's patch-bomb)
Merge misc patches from Andrew Morton:
"Incoming:
- lots of misc stuff
- backlight tree updates
- lib/ updates
- Oleg's percpu-rwsem changes
- checkpatch
- rtc
- aoe
- more checkpoint/restart support
I still have a pile of MM stuff pending - Pekka should be merging
later today after which that is good to go. A number of other things
are twiddling thumbs awaiting maintainer merges."
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (180 commits)
scatterlist: don't BUG when we can trivially return a proper error.
docs: update documentation about /proc/<pid>/fdinfo/<fd> fanotify output
fs, fanotify: add @mflags field to fanotify output
docs: add documentation about /proc/<pid>/fdinfo/<fd> output
fs, notify: add procfs fdinfo helper
fs, exportfs: add exportfs_encode_inode_fh() helper
fs, exportfs: escape nil dereference if no s_export_op present
fs, epoll: add procfs fdinfo helper
fs, eventfd: add procfs fdinfo helper
procfs: add ability to plug in auxiliary fdinfo providers
tools/testing/selftests/kcmp/kcmp_test.c: print reason for failure in kcmp_test
breakpoint selftests: print failure status instead of cause make error
kcmp selftests: print fail status instead of cause make error
kcmp selftests: make run_tests fix
mem-hotplug selftests: print failure status instead of cause make error
cpu-hotplug selftests: print failure status instead of cause make error
mqueue selftests: print failure status instead of cause make error
vm selftests: print failure status instead of cause make error
ubifs: use prandom_bytes
mtd: nandsim: use prandom_bytes
...
Diffstat (limited to 'fs/notify/fdinfo.c')
-rw-r--r-- | fs/notify/fdinfo.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c new file mode 100644 index 0000000..514c4b8 --- /dev/null +++ b/fs/notify/fdinfo.c @@ -0,0 +1,179 @@ +#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 int show_fdinfo(struct seq_file *m, struct file *f, + int (*show)(struct seq_file *m, struct fsnotify_mark *mark)) +{ + struct fsnotify_group *group = f->private_data; + struct fsnotify_mark *mark; + int ret = 0; + + spin_lock(&group->mark_lock); + list_for_each_entry(mark, &group->marks_list, g_list) { + ret = show(m, mark); + if (ret) + break; + } + spin_unlock(&group->mark_lock); + return ret; +} + +#if defined(CONFIG_EXPORTFS) +static int show_mark_fhandle(struct seq_file *m, struct inode *inode) +{ + struct { + struct file_handle handle; + u8 pad[64]; + } 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 == 255) || (ret == -ENOSPC)) { + WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); + return 0; + } + + f.handle.handle_type = ret; + f.handle.handle_bytes = size * sizeof(u32); + + ret = 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++) + ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]); + + return ret; +} +#else +static int show_mark_fhandle(struct seq_file *m, struct inode *inode) +{ + return 0; +} +#endif + +#ifdef CONFIG_INOTIFY_USER + +static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) +{ + struct inotify_inode_mark *inode_mark; + struct inode *inode; + int ret = 0; + + if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE))) + return 0; + + inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); + inode = igrab(mark->i.inode); + if (inode) { + ret = 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); + ret |= show_mark_fhandle(m, inode); + ret |= seq_putc(m, '\n'); + iput(inode); + } + + return ret; +} + +int inotify_show_fdinfo(struct seq_file *m, struct file *f) +{ + return show_fdinfo(m, f, inotify_fdinfo); +} + +#endif /* CONFIG_INOTIFY_USER */ + +#ifdef CONFIG_FANOTIFY + +static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) +{ + unsigned int mflags = 0; + struct inode *inode; + int ret = 0; + + if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE)) + return 0; + + 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->i.inode); + if (!inode) + goto out; + ret = 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); + ret |= show_mark_fhandle(m, inode); + ret |= seq_putc(m, '\n'); + iput(inode); + } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) { + struct mount *mnt = real_mount(mark->m.mnt); + + ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x " + "ignored_mask:%x\n", mnt->mnt_id, mflags, + mark->mask, mark->ignored_mask); + } +out: + return ret; +} + +int 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); + + return show_fdinfo(m, f, fanotify_fdinfo); +} + +#endif /* CONFIG_FANOTIFY */ + +#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ + +#endif /* CONFIG_PROC_FS */ |