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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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28
fs/fs_context.c
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@@ -51,6 +51,7 @@ static struct fs_context *alloc_fs_context(struct file_system_type *fs_type,
unsigned int sb_flags_mask,
enum fs_context_purpose purpose)
{
int (*init_fs_context)(struct fs_context *);
struct fs_context *fc;
int ret = -ENOMEM;
@@ -81,7 +82,12 @@ static struct fs_context *alloc_fs_context(struct file_system_type *fs_type,
break;
}
ret = legacy_init_fs_context(fc);
/* TODO: Make all filesystems support this unconditionally */
init_fs_context = fc->fs_type->init_fs_context;
if (!init_fs_context)
init_fs_context = legacy_init_fs_context;
ret = init_fs_context(fc);
if (ret < 0)
goto err_fc;
fc->need_free = true;
@@ -141,8 +147,8 @@ void put_fs_context(struct fs_context *fc)
deactivate_super(sb);
}
if (fc->need_free)
legacy_fs_context_free(fc);
if (fc->need_free && fc->ops && fc->ops->free)
fc->ops->free(fc);
security_free_mnt_opts(&fc->security);
put_net(fc->net_ns);
@@ -180,7 +186,7 @@ static int legacy_parse_monolithic(struct fs_context *fc, void *data)
/*
* Get a mountable root with the legacy mount command.
*/
int legacy_get_tree(struct fs_context *fc)
static int legacy_get_tree(struct fs_context *fc)
{
struct legacy_fs_context *ctx = fc->fs_private;
struct super_block *sb;
@@ -201,7 +207,7 @@ int legacy_get_tree(struct fs_context *fc)
/*
* Handle remount.
*/
int legacy_reconfigure(struct fs_context *fc)
static int legacy_reconfigure(struct fs_context *fc)
{
struct legacy_fs_context *ctx = fc->fs_private;
struct super_block *sb = fc->root->d_sb;
@@ -213,6 +219,13 @@ int legacy_reconfigure(struct fs_context *fc)
ctx ? ctx->legacy_data : NULL);
}
const struct fs_context_operations legacy_fs_context_ops = {
.free = legacy_fs_context_free,
.parse_monolithic = legacy_parse_monolithic,
.get_tree = legacy_get_tree,
.reconfigure = legacy_reconfigure,
};
/*
* Initialise a legacy context for a filesystem that doesn't support
* fs_context.
@@ -222,10 +235,13 @@ static int legacy_init_fs_context(struct fs_context *fc)
fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL);
if (!fc->fs_private)
return -ENOMEM;
fc->ops = &legacy_fs_context_ops;
return 0;
}
int parse_monolithic_mount_data(struct fs_context *fc, void *data)
{
return legacy_parse_monolithic(fc, data);
int (*monolithic_mount_data)(struct fs_context *, void *);
monolithic_mount_data = fc->ops->parse_monolithic;
return monolithic_mount_data(fc, data);
}