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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 20:50:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 20:50:27 -0700
commit149e703cb8bfcbdae46140b108bb6f7d2407df8f (patch)
tree6fdea7cdd4fb54a272cb7dc3c46cb9f2b84059e9 /Documentation
parentd897166d8598e362a31d79dfd9a1e2eedb9ac85c (diff)
parent6ee9706aa22e026f438caabb2982e5f78de2c82c (diff)
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "Assorted stuff, with no common topic whatsoever..." * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: libfs: document simple_get_link() Documentation/filesystems/Locking: fix ->get_link() prototype Documentation/filesystems/vfs.txt: document how ->i_link works Documentation/filesystems/vfs.txt: remove bogus "Last updated" date fs: use timespec64 in relatime_need_update fs/block_dev.c: remove unused include
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/Locking2
-rw-r--r--Documentation/filesystems/vfs.txt8
2 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 7b20c385cc02..dac435575384 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -52,7 +52,7 @@ prototypes:
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
- const char *(*get_link) (struct dentry *, struct inode *, void **);
+ const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *);
void (*truncate) (struct inode *);
int (*permission) (struct inode *, int, unsigned int);
int (*get_acl)(struct inode *, int);
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 761c6fd24a53..57fc576b1f3e 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -3,8 +3,6 @@
Original author: Richard Gooch <rgooch@atnf.csiro.au>
- Last updated on June 24, 2007.
-
Copyright (C) 1999 Richard Gooch
Copyright (C) 2005 Pekka Enberg
@@ -465,6 +463,12 @@ otherwise noted.
argument. If request can't be handled without leaving RCU mode,
have it return ERR_PTR(-ECHILD).
+ If the filesystem stores the symlink target in ->i_link, the
+ VFS may use it directly without calling ->get_link(); however,
+ ->get_link() must still be provided. ->i_link must not be
+ freed until after an RCU grace period. Writing to ->i_link
+ post-iget() time requires a 'release' memory barrier.
+
readlink: this is now just an override for use by readlink(2) for the
cases when ->get_link uses nd_jump_link() or object is not in
fact a symlink. Normally filesystems should only implement