Messages in this thread Patch in this message | | | Subject | [PATCH 3/5] vfs: Allow fsinfo() to query what's in an fs_context | From | David Howells <> | Date | Wed, 01 Aug 2018 17:14:14 +0100 |
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Allow fsinfo() to be used to query the filesystem attached to an fs_context once a superblock has been created or if it comes from fspick().
This is done with something like:
fd = fsopen("ext4", 0); ... fsconfig(fd, fsconfig_cmd_create, ...); fsinfo(fd, NULL, ...);
Signed-off-by: David Howells <dhowells@redhat.com> ---
fs/statfs.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/fs/statfs.c b/fs/statfs.c index 87826933faa0..2757fbaa80fb 100644 --- a/fs/statfs.c +++ b/fs/statfs.c @@ -667,13 +667,40 @@ static int vfs_fsinfo_path(int dfd, const char __user *filename, return ret; } +static int vfs_fsinfo_fscontext(struct fs_context *fc, + struct fsinfo_kparams *params) +{ + int ret; + + if (fc->ops == &legacy_fs_context_ops) + return -EOPNOTSUPP; + + ret = mutex_lock_interruptible(&fc->uapi_mutex); + if (ret < 0) + return ret; + + ret = -EIO; + if (fc->root) { + struct path path = { .dentry = fc->root }; + + ret = vfs_fsinfo(&path, params); + } + + mutex_unlock(&fc->uapi_mutex); + return ret; +} + static int vfs_fsinfo_fd(unsigned int fd, struct fsinfo_kparams *params) { struct fd f = fdget_raw(fd); int ret = -EBADF; if (f.file) { - ret = vfs_fsinfo(&f.file->f_path, params); + if (f.file->f_op == &fscontext_fops) + ret = vfs_fsinfo_fscontext(f.file->private_data, + params); + else + ret = vfs_fsinfo(&f.file->f_path, params); fdput(f); } return ret;
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