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authorAl Viro <viro@zeniv.linux.org.uk>2017-07-07 21:51:19 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-08 03:09:10 +0300
commit49d31c2f389acfe83417083e1208422b4091cd9e (patch)
treeb4ab96fd8300dd73a398a7d587f8839fa052c03b /include/linux/dcache.h
parenta8e2b6367794e6cee9eecba6d5ff425f338e0754 (diff)
downloadlinux-49d31c2f389acfe83417083e1208422b4091cd9e.tar.xz
dentry name snapshots
take_dentry_name_snapshot() takes a safe snapshot of dentry name; if the name is a short one, it gets copied into caller-supplied structure, otherwise an extra reference to external name is grabbed (those are never modified). In either case the pointer to stable string is stored into the same structure. dentry must be held by the caller of take_dentry_name_snapshot(), but may be freely dropped afterwards - the snapshot will stay until destroyed by release_dentry_name_snapshot(). Intended use: struct name_snapshot s; take_dentry_name_snapshot(&s, dentry); ... access s.name ... release_dentry_name_snapshot(&s); Replaces fsnotify_oldname_...(), gets used in fsnotify to obtain the name to pass down with event. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/dcache.h')
-rw-r--r--include/linux/dcache.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index d2e38dc6172c..025727bf6797 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -591,5 +591,11 @@ static inline struct inode *d_real_inode(const struct dentry *dentry)
return d_backing_inode(d_real((struct dentry *) dentry, NULL, 0));
}
+struct name_snapshot {
+ const char *name;
+ char inline_name[DNAME_INLINE_LEN];
+};
+void take_dentry_name_snapshot(struct name_snapshot *, struct dentry *);
+void release_dentry_name_snapshot(struct name_snapshot *);
#endif /* __LINUX_DCACHE_H */