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[PATCH] fuse: support caching negative dentries

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Add support for caching negative dentries.

Up till now, ->d_revalidate() always forced a new lookup on these.  Now let
the lookup method return a zero node ID (not used for anything else) meaning a
negative entry, but with a positive cache timeout.  The old way of signaling
negative entry (replying ENOENT) still works.

Userspace should check the ABI minor version to see whether sending a zero ID
is allowed by the kernel or not.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2006-01-06 00:19:38 -08:00 committed by Linus Torvalds
parent de5f120255
commit 8cbdf1e6f6
1 changed files with 43 additions and 21 deletions
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64
fs/fuse/dir.c
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@ -23,9 +23,26 @@ static inline unsigned long time_to_jiffies(unsigned long sec,
static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o)
{
struct fuse_inode *fi = get_fuse_inode(entry->d_inode);
entry->d_time = time_to_jiffies(o->entry_valid, o->entry_valid_nsec);
fi->i_time = time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
if (entry->d_inode)
get_fuse_inode(entry->d_inode)->i_time =
time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
}
void fuse_invalidate_attr(struct inode *inode)
{
get_fuse_inode(inode)->i_time = jiffies - 1;
}
static void fuse_invalidate_entry_cache(struct dentry *entry)
{
entry->d_time = jiffies - 1;
}
static void fuse_invalidate_entry(struct dentry *entry)
{
d_invalidate(entry);
fuse_invalidate_entry_cache(entry);
}
static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
@ -45,15 +62,22 @@ static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
if (!entry->d_inode || is_bad_inode(entry->d_inode))
struct inode *inode = entry->d_inode;
if (inode && is_bad_inode(inode))
return 0;
else if (time_after(jiffies, entry->d_time)) {
int err;
struct fuse_entry_out outarg;
struct inode *inode = entry->d_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
struct fuse_conn *fc;
struct fuse_req *req;
fuse_invalidate_entry_cache(entry);
if (!inode)
return 0;
fc = get_fuse_conn(inode);
req = fuse_get_request(fc);
if (!req)
return 0;
@ -61,6 +85,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
request_send(fc, req);
err = req->out.h.error;
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_send_forget(fc, req, outarg.nodeid, 1);
return 0;
@ -118,9 +143,9 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
if (!err && invalid_nodeid(outarg.nodeid))
if (!err && outarg.nodeid && invalid_nodeid(outarg.nodeid))
err = -EIO;
if (!err) {
if (!err && outarg.nodeid) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
@ -138,22 +163,13 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
}
d_add(entry, inode);
entry->d_op = &fuse_dentry_operations;
if (inode)
if (!err)
fuse_change_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
return NULL;
}
void fuse_invalidate_attr(struct inode *inode)
{
get_fuse_inode(inode)->i_time = jiffies - 1;
}
static void fuse_invalidate_entry(struct dentry *entry)
{
d_invalidate(entry);
entry->d_time = jiffies - 1;
}
static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
@ -387,6 +403,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
inode->i_nlink = 0;
fuse_invalidate_attr(inode);
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
@ -412,6 +429,7 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
if (!err) {
entry->d_inode->i_nlink = 0;
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
@ -447,6 +465,10 @@ static int fuse_rename(struct inode *olddir, struct dentry *oldent,
fuse_invalidate_attr(olddir);
if (olddir != newdir)
fuse_invalidate_attr(newdir);
/* newent will end up negative */
if (newent->d_inode)
fuse_invalidate_entry_cache(newent);
} else if (err == -EINTR) {
/* If request was interrupted, DEITY only knows if the
rename actually took place. If the invalidation