From: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx> This commit add fuse connection device id, open_flags and backing files, to fdinfo of opened fuse files. Related discussions can be found at links below. Link: https://lore.kernel.org/all/CAOQ4uxgS3OUy9tpphAJKCQFRAn2zTERXXa0QN_KvP6ZOe2KVBw@xxxxxxxxxxxxxx/ Link: https://lore.kernel.org/all/CAOQ4uxgkg0uOuAWO2wOPNkMmD9wqd5wMX+gTfCT-zVHBC8CkZg@xxxxxxxxxxxxxx/ Cc: Amir Goldstein <amir73il@xxxxxxxxx> Signed-off-by: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx> --- fs/fuse/file.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 754378dd9f7159f20fde6376962d45c4c706b868..1e54965780e9d625918c22a3dea48ba5a9a5ed1b 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -8,6 +8,8 @@ #include "fuse_i.h" +#include "linux/idr.h" +#include "linux/rcupdate.h" #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/kernel.h> @@ -3392,6 +3394,21 @@ static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off, return ret; } +static void fuse_file_show_fdinfo(struct seq_file *seq, struct file *f) +{ + struct fuse_file *ff = f->private_data; + struct fuse_conn *fc = ff->fm->fc; + struct file *backing_file = fuse_file_passthrough(ff); + + seq_printf(seq, "fuse conn:%u open_flags:%u\n", fc->dev, ff->open_flags); + + if (backing_file) { + seq_puts(seq, "fuse backing_file: "); + seq_file_path(seq, backing_file, " \t\n\\"); + seq_puts(seq, "\n"); + } +} + static const struct file_operations fuse_file_operations = { .llseek = fuse_file_llseek, .read_iter = fuse_file_read_iter, @@ -3411,6 +3428,9 @@ static const struct file_operations fuse_file_operations = { .poll = fuse_file_poll, .fallocate = fuse_file_fallocate, .copy_file_range = fuse_copy_file_range, +#ifdef CONFIG_PROC_FS + .show_fdinfo = fuse_file_show_fdinfo, +#endif }; static const struct address_space_operations fuse_file_aops = { -- 2.43.0
