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| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2012-12-17 16:04:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 17:15:27 -0800 |
| commit | 55985dd72ab27b47530dcc8bdddd28b69f4abe8b (patch) | |
| tree | 9117b3f9bc9d46fe89ee3eccc959bab9b0e9db7b | |
| parent | 2bf1cbf1c616b4dd85a3a8a715af9c5701c16a91 (diff) | |
| download | op-kernel-dev-55985dd72ab27b47530dcc8bdddd28b69f4abe8b.zip op-kernel-dev-55985dd72ab27b47530dcc8bdddd28b69f4abe8b.tar.gz | |
procfs: add ability to plug in auxiliary fdinfo providers
This patch brings ability to print out auxiliary data associated with
file in procfs interface /proc/pid/fdinfo/fd.
In particular further patches make eventfd, evenpoll, signalfd and
fsnotify to print additional information complete enough to restore
these objects after checkpoint.
To simplify the code we add show_fdinfo callback inside struct
file_operations (as Al and Pavel are proposing).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matthew Helsley <matt.helsley@gmail.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/fd.c | 2 | ||||
| -rw-r--r-- | include/linux/fs.h | 4 |
2 files changed, 4 insertions, 2 deletions
diff --git a/fs/proc/fd.c b/fs/proc/fd.c index f28a875..d7a4a28 100644 --- a/fs/proc/fd.c +++ b/fs/proc/fd.c @@ -50,6 +50,8 @@ static int seq_show(struct seq_file *m, void *v) if (!ret) { seq_printf(m, "pos:\t%lli\nflags:\t0%o\n", (long long)file->f_pos, f_flags); + if (file->f_op->show_fdinfo) + ret = file->f_op->show_fdinfo(m, file); fput(file); } diff --git a/include/linux/fs.h b/include/linux/fs.h index 029552f..5abf703 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -44,6 +44,7 @@ struct vm_area_struct; struct vfsmount; struct cred; struct swap_info_struct; +struct seq_file; extern void __init inode_init(void); extern void __init inode_init_early(void); @@ -1543,6 +1544,7 @@ struct file_operations { int (*setlease)(struct file *, long, struct file_lock **); long (*fallocate)(struct file *file, int mode, loff_t offset, loff_t len); + int (*show_fdinfo)(struct seq_file *m, struct file *f); }; struct inode_operations { @@ -1578,8 +1580,6 @@ struct inode_operations { umode_t create_mode, int *opened); } ____cacheline_aligned; -struct seq_file; - ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, |
