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 <[email protected]> CC: Pavel Emelyanov <[email protected]> CC: Oleg Nesterov <[email protected]> CC: Andrey Vagin <[email protected]> CC: Al Viro <[email protected]> CC: Alexey Dobriyan <[email protected]> CC: Andrew Morton <[email protected]> CC: James Bottomley <[email protected]> CC: "Aneesh Kumar K.V" <[email protected]> CC: Alexey Dobriyan <[email protected]> CC: Matthew Helsley <[email protected]> CC: "J. Bruce Fields" <[email protected]> CC: "Aneesh Kumar K.V" <[email protected]> CC: Tvrtko Ursulin <[email protected]> --- fs/proc/fd.c | 2 ++ include/linux/fs.h | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) Index: linux-2.6.git/fs/proc/fd.c =================================================================== --- linux-2.6.git.orig/fs/proc/fd.c +++ linux-2.6.git/fs/proc/fd.c @@ -50,6 +50,8 @@ static int seq_show(struct seq_file *m, 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); } Index: linux-2.6.git/include/linux/fs.h =================================================================== --- linux-2.6.git.orig/include/linux/fs.h +++ linux-2.6.git/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); @@ -1545,6 +1546,7 @@ 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 { @@ -1580,8 +1582,6 @@ 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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
