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authorAndreas Gruenbacher <agruenba@redhat.com>2022-06-08 17:22:55 +0300
committerAndreas Gruenbacher <agruenba@redhat.com>2022-06-29 14:07:16 +0300
commit4480c27ca3eaaaae134633a594fba5601da13b4a (patch)
treeaca11ce2bab69d33f063fc50fc3664f3a8da4634 /fs/file.c
parent03c765b0e3b4cb5063276b086c76f7a612856a9a (diff)
downloadlinux-4480c27ca3eaaaae134633a594fba5601da13b4a.tar.xz
gfs2: Add glockfd debugfs file
When a process has a gfs2 file open, the file is keeping a reference on the underlying gfs2 inode, and the inode is keeping the inode's iopen glock held in shared mode. In other words, the process depends on the iopen glock of each open gfs2 file. Expose those dependencies in a new "glockfd" debugfs file. The new debugfs file contains one line for each gfs2 file descriptor, specifying the tgid, file descriptor number, and glock name, e.g., 1601 6 5/816d This list is compiled by iterating all tasks on the system using find_ge_pid(), and all file descriptors of each task using task_lookup_next_fd_rcu(). To make that work from gfs2, export those two functions. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/file.c')
-rw-r--r--fs/file.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c
index 3bcc1ecc314a..5f9c802a5d8d 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -980,6 +980,7 @@ struct file *task_lookup_next_fd_rcu(struct task_struct *task, unsigned int *ret
*ret_fd = fd;
return file;
}
+EXPORT_SYMBOL(task_lookup_next_fd_rcu);
/*
* Lightweight file lookup - no refcnt increment if fd table isn't shared.