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introduce fs_context methods

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2018-12-23 18:55:56 -05:00
parent e1a91586d5
commit f3a09c9201
5 changed files with 65 additions and 16 deletions
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36
fs/super.c
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@@ -894,13 +894,15 @@ int reconfigure_super(struct fs_context *fc)
}
}
retval = legacy_reconfigure(fc);
if (retval) {
if (!force)
goto cancel_readonly;
/* If forced remount, go ahead despite any errors */
WARN(1, "forced remount of a %s fs returned %i\n",
sb->s_type->name, retval);
if (fc->ops->reconfigure) {
retval = fc->ops->reconfigure(fc);
if (retval) {
if (!force)
goto cancel_readonly;
/* If forced remount, go ahead despite any errors */
WARN(1, "forced remount of a %s fs returned %i\n",
sb->s_type->name, retval);
}
}
WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |
@@ -1294,10 +1296,28 @@ int vfs_get_tree(struct fs_context *fc)
struct super_block *sb;
int error;
error = legacy_get_tree(fc);
if (fc->fs_type->fs_flags & FS_REQUIRES_DEV && !fc->source)
return -ENOENT;
if (fc->root)
return -EBUSY;
/* Get the mountable root in fc->root, with a ref on the root and a ref
* on the superblock.
*/
error = fc->ops->get_tree(fc);
if (error < 0)
return error;
if (!fc->root) {
pr_err("Filesystem %s get_tree() didn't set fc->root\n",
fc->fs_type->name);
/* We don't know what the locking state of the superblock is -
* if there is a superblock.
*/
BUG();
}
sb = fc->root->d_sb;
WARN_ON(!sb->s_bdi);