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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>
This commit is contained in:
Christian Brauner 2023-08-02 13:57:04 +02:00
parent e062abaec6
commit dae8b08d5d
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 34 additions and 17 deletions
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51
fs/fsopen.c
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@ -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;