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ANDROID: vfs: d_canonical_path for stacked FS

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Inotify does not currently know when a filesystem is acting as a wrapper
around another fs. This means that inotify watchers will miss any
modifications to the base file, as well as any made in a separate stacked
fs that points to the same file.
d_canonical_path solves this problem by allowing the fs to map a dentry to
a path in the lower fs. Inotify can use it to find the appropriate place to
watch to be informed of all changes to a file.

Original-Change-Id: I09563baffad1711a045e45c1bd0bd8713c2cc0b6

Test: FileObserverTest and FileObserverTestLegacyPath on Cuttlefish
Bug: 171780975
Signed-off-by: Daniel Rosenberg <drosen@google.com>
[astrachan: Folded 34df4102216e ("ANDROID: fsnotify: Notify lower fs of
            open") into this patch]
Signed-off-by: Alistair Strachan <astrachan@google.com>
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: Ifb6719eaa466ab9cc98ab4b02866de16f7c73cbf
This commit is contained in:
Alessio Balsini
2020-10-27 13:24:03 +00:00
parent cc47b201a8
commit f37e05049b
3 changed files with 30 additions and 2 deletions
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include/linux/dcache.h
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@@ -147,6 +147,7 @@ struct dentry_operations {
struct vfsmount *(*d_automount)(struct path *);
int (*d_manage)(const struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *);
void (*d_canonical_path)(const struct path *, struct path *);
} ____cacheline_aligned;
/*