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ANDROID: mnt: Add filesystem private data to mount points

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This starts to add private data associated directly
to mount points. The intent is to give filesystems
a sense of where they have come from, as a means of
letting a filesystem take different actions based on
this information.

Bug: 62094374
Bug: 120446149
Change-Id: Ie769d7b3bb2f5972afe05c1bf16cf88c91647ab2
Signed-off-by: Daniel Rosenberg <drosen@google.com>
[astrachan: Folded 89a54ed3bf68 ("ANDROID: mnt: Fix next_descendent")
            into this patch]
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Daniel Rosenberg
2016-10-26 15:29:51 -07:00
committed by Alistair Strachan
parent 50f0dd432b
commit a618d31ac8
5 changed files with 64 additions and 1 deletions
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3
include/linux/fs.h
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@@ -1861,6 +1861,8 @@ struct super_operations {
int (*unfreeze_fs) (struct super_block *);
int (*statfs) (struct dentry *, struct kstatfs *);
int (*remount_fs) (struct super_block *, int *, char *);
void *(*clone_mnt_data) (void *);
void (*copy_mnt_data) (void *, void *);
void (*umount_begin) (struct super_block *);
int (*show_options)(struct seq_file *, struct dentry *);
@@ -2123,6 +2125,7 @@ struct file_system_type {
#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
struct dentry *(*mount) (struct file_system_type *, int,
const char *, void *);
void *(*alloc_mnt_data) (void);
void (*kill_sb) (struct super_block *);
struct module *owner;
struct file_system_type * next;