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authorChristian Brauner <brauner@kernel.org>2023-08-02 14:57:04 +0300
committerChristian Brauner <brauner@kernel.org>2023-08-14 19:48:02 +0300
commitdae8b08d5d83b7550917af06cfba76f0b908bf15 (patch)
treeedb057d1f4ee345a2513f9d12bb7c4360ad7f927 /fs/fsopen.c
parente062abaec65b970c4d7ecf26bc1558a1b6f92970 (diff)
downloadlinux-dae8b08d5d83b7550917af06cfba76f0b908bf15.tar.xz
fs: add vfs_cmd_create()
Split the steps to create a superblock into a tiny helper. This will make the next patch easier to follow. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Aleksa Sarai <cyphar@cyphar.com> Message-Id: <20230802-vfs-super-exclusive-v2-2-95dc4e41b870@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/fsopen.c')
-rw-r--r--fs/fsopen.c51
1 files changed, 34 insertions, 17 deletions
diff --git a/fs/fsopen.c b/fs/fsopen.c
index fc9d2d9fd234..1de2b3576958 100644
--- a/fs/fsopen.c
+++ b/fs/fsopen.c
@@ -209,6 +209,39 @@ err:
return ret;
}
+static int vfs_cmd_create(struct fs_context *fc)
+{
+ struct super_block *sb;
+ int ret;
+
+ if (fc->phase != FS_CONTEXT_CREATE_PARAMS)
+ return -EBUSY;
+
+ if (!mount_capable(fc))
+ return -EPERM;
+
+ fc->phase = FS_CONTEXT_CREATING;
+
+ ret = vfs_get_tree(fc);
+ if (ret) {
+ fc->phase = FS_CONTEXT_FAILED;
+ return ret;
+ }
+
+ sb = fc->root->d_sb;
+ ret = security_sb_kern_mount(sb);
+ if (unlikely(ret)) {
+ fc_drop_locked(fc);
+ fc->phase = FS_CONTEXT_FAILED;
+ return ret;
+ }
+
+ /* vfs_get_tree() callchains will have grabbed @s_umount */
+ up_write(&sb->s_umount);
+ fc->phase = FS_CONTEXT_AWAITING_MOUNT;
+ return 0;
+}
+
/*
* Check the state and apply the configuration. Note that this function is
* allowed to 'steal' the value by setting param->xxx to NULL before returning.
@@ -224,23 +257,7 @@ static int vfs_fsconfig_locked(struct fs_context *fc, int cmd,
return ret;
switch (cmd) {
case FSCONFIG_CMD_CREATE:
- if (fc->phase != FS_CONTEXT_CREATE_PARAMS)
- return -EBUSY;
- if (!mount_capable(fc))
- return -EPERM;
- fc->phase = FS_CONTEXT_CREATING;
- ret = vfs_get_tree(fc);
- if (ret)
- break;
- sb = fc->root->d_sb;
- ret = security_sb_kern_mount(sb);
- if (unlikely(ret)) {
- fc_drop_locked(fc);
- break;
- }
- up_write(&sb->s_umount);
- fc->phase = FS_CONTEXT_AWAITING_MOUNT;
- return 0;
+ return vfs_cmd_create(fc);
case FSCONFIG_CMD_RECONFIGURE:
if (fc->phase != FS_CONTEXT_RECONF_PARAMS)
return -EBUSY;