The patch titled
autofs4 needs to force fail return revalidate (update)
has been added to the -mm tree. Its filename is
autofs4-needs-to-force-fail-return-revalidate-update.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: autofs4 needs to force fail return revalidate (update)
From: Ian Kent <raven@xxxxxxxxxx>
Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/autofs4/root.c | 45 ++++++++++++------
fs/namei.c | 94 ++++++++++++++-------------------------
include/linux/dcache.h | 1
3 files changed, 65 insertions(+), 75 deletions(-)
diff -puN fs/autofs4/root.c~autofs4-needs-to-force-fail-return-revalidate-update fs/autofs4/root.c
--- a/fs/autofs4/root.c~autofs4-needs-to-force-fail-return-revalidate-update
+++ a/fs/autofs4/root.c
@@ -137,7 +137,9 @@ static int autofs4_dir_open(struct inode
nd.flags = LOOKUP_DIRECTORY;
ret = (dentry->d_op->d_revalidate)(dentry, &nd);
- if (!ret) {
+ if (ret <= 0) {
+ if (ret < 0)
+ status = ret;
dcache_dir_close(inode, file);
goto out;
}
@@ -400,13 +402,23 @@ static int autofs4_revalidate(struct den
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
int oz_mode = autofs4_oz_mode(sbi);
int flags = nd ? nd->flags : 0;
- int status = 0;
+ int status = 1;
/* Pending dentry */
if (autofs4_ispending(dentry)) {
- if (!oz_mode)
- status = try_to_fill_dentry(dentry, flags);
- return !status;
+ /* The daemon never causes a mount to trigger */
+ if (oz_mode)
+ return 1;
+
+ /*
+ * A zero status is success otherwise we have a
+ * negative error code.
+ */
+ status = try_to_fill_dentry(dentry, flags);
+ if (status == 0)
+ return 1;
+
+ return status;
}
/* Negative dentry.. invalidate if "old" */
@@ -421,16 +433,19 @@ static int autofs4_revalidate(struct den
DPRINTK("dentry=%p %.*s, emptydir",
dentry, dentry->d_name.len, dentry->d_name.name);
spin_unlock(&dcache_lock);
- if (!oz_mode) {
- status = try_to_fill_dentry(dentry, flags);
- if (status) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags |= DCACHE_REVAL_FORCE_FAIL;
- spin_unlock(&dentry->d_lock);
- return 0;
- }
- }
- return !status;
+ /* The daemon never causes a mount to trigger */
+ if (oz_mode)
+ return 1;
+
+ /*
+ * A zero status is success otherwise we have a
+ * negative error code.
+ */
+ status = try_to_fill_dentry(dentry, flags);
+ if (status == 0)
+ return 1;
+
+ return status;
}
spin_unlock(&dcache_lock);
diff -puN fs/namei.c~autofs4-needs-to-force-fail-return-revalidate-update fs/namei.c
--- a/fs/namei.c~autofs4-needs-to-force-fail-return-revalidate-update
+++ a/fs/namei.c
@@ -365,6 +365,29 @@ void release_open_intent(struct nameidat
fput(nd->intent.open.file);
}
+static __always_inline struct dentry *do_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ int status = dentry->d_op->d_revalidate(dentry, nd);
+ if (unlikely(status <= 0)) {
+ /*
+ * The dentry failed validation.
+ * If d_revalidate returned 0 attempt to invalidate
+ * the dentry otherwise d_revalidate is asking us
+ * to return a fail status.
+ */
+ if (!status) {
+ if (!d_invalidate(dentry)) {
+ dput(dentry);
+ dentry = NULL;
+ }
+ } else {
+ dput(dentry);
+ dentry = ERR_PTR(status);
+ }
+ }
+ return dentry;
+}
+
/*
* Internal lookup() using the new generic dcache.
* SMP-safe
@@ -379,27 +402,9 @@ static struct dentry * cached_lookup(str
if (!dentry)
dentry = d_lookup(parent, name);
- if (dentry && dentry->d_op && dentry->d_op->d_revalidate) {
- if (!dentry->d_op->d_revalidate(dentry, nd)) {
- if (!d_invalidate(dentry)) {
- dput(dentry);
- return NULL;
- }
- /*
- * As well as the normal validation, check if we need
- * to force a fail on a valid dentry (autofs4 browsable
- * mounts).
- */
- spin_lock(&dentry->d_lock);
- if (dentry->d_flags & DCACHE_REVAL_FORCE_FAIL) {
- dentry->d_flags &= ~DCACHE_REVAL_FORCE_FAIL;
- spin_unlock(&dentry->d_lock);
- dput(dentry);
- return ERR_PTR(-ENOENT);
- }
- spin_unlock(&dentry->d_lock);
- }
- }
+ if (dentry && dentry->d_op && dentry->d_op->d_revalidate)
+ dentry = do_revalidate(dentry, nd);
+
return dentry;
}
@@ -492,25 +497,9 @@ static struct dentry * real_lookup(struc
*/
mutex_unlock(&dir->i_mutex);
if (result->d_op && result->d_op->d_revalidate) {
- if (!result->d_op->d_revalidate(result, nd)) {
- if (!d_invalidate(result)) {
- dput(result);
- return ERR_PTR(-ENOENT);
- }
- /*
- * d_revalidate failed but the dentry is still valid so
- * check if we need to force a fail on the dentry (autofs4
- * browsable mounts).
- */
- spin_lock(&result->d_lock);
- if (result->d_flags & DCACHE_REVAL_FORCE_FAIL) {
- result->d_flags &= ~DCACHE_REVAL_FORCE_FAIL;
- spin_unlock(&result->d_lock);
- dput(result);
- return ERR_PTR(-ENOENT);
- }
- spin_unlock(&result->d_lock);
- }
+ result = do_revalidate(result, nd);
+ if (!result)
+ result = ERR_PTR(-ENOENT);
}
return result;
}
@@ -790,25 +779,12 @@ need_lookup:
goto done;
need_revalidate:
- if (dentry->d_op->d_revalidate(dentry, nd))
- goto done;
- if (d_invalidate(dentry)) {
- /*
- * d_revalidate failed but the dentry is still valid so check
- * if we need to return a fail (autofs4 browsable mounts).
- */
- spin_lock(&dentry->d_lock);
- if (dentry->d_flags & DCACHE_REVAL_FORCE_FAIL) {
- dentry->d_flags &= ~DCACHE_REVAL_FORCE_FAIL;
- spin_unlock(&dentry->d_lock);
- dput(dentry);
- return -ENOENT;
- }
- spin_unlock(&dentry->d_lock);
- goto done;
- }
- dput(dentry);
- goto need_lookup;
+ dentry = do_revalidate(dentry, nd);
+ if (!dentry)
+ goto need_lookup;
+ if (IS_ERR(dentry))
+ goto fail;
+ goto done;
fail:
return PTR_ERR(dentry);
diff -puN include/linux/dcache.h~autofs4-needs-to-force-fail-return-revalidate-update include/linux/dcache.h
--- a/include/linux/dcache.h~autofs4-needs-to-force-fail-return-revalidate-update
+++ a/include/linux/dcache.h
@@ -163,7 +163,6 @@ d_iput: no no no yes
#define DCACHE_UNHASHED 0x0010
#define DCACHE_INOTIFY_PARENT_WATCHED 0x0020 /* Parent inode is watched */
-#define DCACHE_REVAL_FORCE_FAIL 0x0040 /* Force revalidate fail on valid dentry */
extern spinlock_t dcache_lock;
_
Patches currently in -mm which might be from raven@xxxxxxxxxx are
autofs4-need-to-invalidate-children-on-tree-mount-expire.patch
autofs4-needs-to-force-fail-return-revalidate.patch
autofs4-needs-to-force-fail-return-revalidate-update.patch
fs-use-list_move.patch
-
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