Messages in this thread Patch in this message | | | Date | Thu, 23 Aug 2012 14:43:26 +0400 | From | Cyrill Gorcunov <> | Subject | [patch 3/9] procfs: Add ability to plug in auxiliary fdinfo providers |
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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> CC: Pavel Emelyanov <xemul@parallels.com> CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Alexey Dobriyan <adobriyan@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> 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> --- fs/proc/fd.c | 5 +++++ include/linux/fs.h | 3 +++ 2 files changed, 8 insertions(+)
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 @@ -23,8 +23,13 @@ struct proc_fdinfo { static int seq_show(struct seq_file *m, void *v) { struct proc_fdinfo *fdinfo = container_of(m, struct proc_fdinfo, m); + seq_printf(m, "pos:\t%lli\nflags:\t0%o\n", (long long)fdinfo->fd_file->f_pos, fdinfo->f_flags); + + if (fdinfo->fd_file->f_op->show_fdinfo) + return fdinfo->fd_file->f_op->show_fdinfo(m, fdinfo->fd_file); + return 0; } 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 @@ -1775,6 +1775,8 @@ struct block_device_operations; #define HAVE_COMPAT_IOCTL 1 #define HAVE_UNLOCKED_IOCTL 1 +struct seq_file; + struct file_operations { struct module *owner; loff_t (*llseek) (struct file *, loff_t, int); @@ -1803,6 +1805,7 @@ 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 {
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