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SubjectRe: [RFC] yet another knfsd-reiserfs patch


On Monday, April 23, 2001 10:45:14 AM -0400 Chris Mason <mason@suse.com> wrote:

>
> Hi guys,
>
> This patch is not meant to replace Neil Brown's knfsd ops stuff, the
> goal was to whip up something that had a chance of getting into 2.4.x,
> and that might be usable by the AFS guys too. Neil's patch tries to
> address a bunch of things that I didn't, and looks better for the
> long run.
>

Ok, here it is updated to 2.4.4. The only change was to adapt to the usage
of comp_short_keys in reiserfs_iget under 2.4.4.

-chris

diff -Nru a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
--- a/fs/nfsd/nfsfh.c Sun Apr 29 18:01:04 2001
+++ b/fs/nfsd/nfsfh.c Sun Apr 29 18:01:04 2001
@@ -116,40 +116,12 @@
return error;
}

-/* this should be provided by each filesystem in an nfsd_operations interface as
- * iget isn't really the right interface
- */
-static struct dentry *nfsd_iget(struct super_block *sb, unsigned long ino, __u32 generation)
+static struct dentry *dentry_from_inode(struct inode *inode)
{
-
- /* iget isn't really right if the inode is currently unallocated!!
- * This should really all be done inside each filesystem
- *
- * ext2fs' read_inode has been strengthed to return a bad_inode if the inode
- * had been deleted.
- *
- * Currently we don't know the generation for parent directory, so a generation
- * of 0 means "accept any"
- */
- struct inode *inode;
struct list_head *lp;
struct dentry *result;
- inode = iget(sb, ino);
- if (is_bad_inode(inode)
- || (generation && inode->i_generation != generation)
- ) {
- /* we didn't find the right inode.. */
- dprintk("fh_verify: Inode %lu, Bad count: %d %d or version %u %u\n",
- inode->i_ino,
- inode->i_nlink, atomic_read(&inode->i_count),
- inode->i_generation,
- generation);
-
- iput(inode);
- return ERR_PTR(-ESTALE);
- }
- /* now to find a dentry.
- * If possible, get a well-connected one
+ /*
+ * If possible, get a well-connected dentry
*/
spin_lock(&dcache_lock);
for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
@@ -172,6 +144,92 @@
return result;
}

+static struct inode *__inode_from_fh(struct super_block *sb, int ino,
+ int generation)
+{
+ struct inode *inode ;
+
+ inode = iget(sb, ino);
+ if (is_bad_inode(inode)
+ || (generation && inode->i_generation != generation)
+ ) {
+ /* we didn't find the right inode.. */
+ dprintk("fh_verify: Inode %lu, Bad count: %d %d or version %u %u\n",
+ inode->i_ino,
+ inode->i_nlink, atomic_read(&inode->i_count),
+ inode->i_generation,
+ generation);
+
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+ return inode ;
+}
+
+static struct inode *inode_from_fh(struct super_block *sb,
+ __u32 *datap,
+ int len)
+{
+ if (sb->s_op->inode_from_fh)
+ return sb->s_op->inode_from_fh(sb, datap, len) ;
+ return __inode_from_fh(sb, datap[0], datap[1]) ;
+}
+
+static struct inode *parent_from_fh(struct super_block *sb,
+ __u32 *datap,
+ int len)
+{
+ if (sb->s_op->parent_from_fh)
+ return sb->s_op->parent_from_fh(sb, datap, len) ;
+
+ if (len >= 3)
+ return __inode_from_fh(sb, datap[2], 0) ;
+ return ERR_PTR(-ESTALE);
+}
+
+/*
+ * two iget funcs, one for inode, and one for parent directory
+ *
+ * this should be provided by each filesystem in an nfsd_operations interface as
+ * iget isn't really the right interface
+ *
+ * If the filesystem doesn't provide funcs to get inodes from datap,
+ * it must be: inum, generation, dir inum. Length of 2 means the
+ * dir inum isn't there.
+ *
+ * iget isn't really right if the inode is currently unallocated!!
+ * This should really all be done inside each filesystem
+ *
+ * ext2fs' read_inode has been strengthed to return a bad_inode if the inode
+ * had been deleted.
+ *
+ * Currently we don't know the generation for parent directory, so a generation
+ * of 0 means "accept any"
+ */
+static struct dentry *nfsd_iget(struct super_block *sb, __u32 *datap, int len)
+{
+
+ struct inode *inode;
+
+ inode = inode_from_fh(sb, datap, len) ;
+ if (IS_ERR(inode)) {
+ return ERR_PTR(PTR_ERR(inode)) ;
+ }
+ return dentry_from_inode(inode) ;
+}
+
+static struct dentry *nfsd_parent_iget(struct super_block *sb, __u32 *datap,
+ int len)
+{
+ struct inode *inode;
+
+ inode = parent_from_fh(sb, datap, len) ;
+ if (IS_ERR(inode)) {
+ return ERR_PTR(PTR_ERR(inode)) ;
+ }
+ return dentry_from_inode(inode) ;
+}
+
/* this routine links an IS_ROOT dentry into the dcache tree. It gains "parent"
* as a parent and "name" as a name
* It should possibly go in dcache.c
@@ -339,9 +397,13 @@
* We use nfsd_iget and if that doesn't return a suitably connected dentry,
* we try to find the parent, and the parent of that and so-on until a
* connection if made.
+ *
+ * If the filesystem doesn't provide funcs to get inodes from datap,
+ * it must be: inum, generation, dir inum. Length of 2 means the
+ * dir inum isn't there.
*/
static struct dentry *
-find_fh_dentry(struct super_block *sb, ino_t ino, int generation, ino_t dirino, int needpath)
+find_fh_dentry(struct super_block *sb, __u32 *datap, int len, int needpath)
{
struct dentry *dentry, *result = NULL;
struct dentry *tmp;
@@ -361,7 +423,7 @@
*/
retry:
down(&sb->s_nfsd_free_path_sem);
- result = nfsd_iget(sb, ino, generation);
+ result = nfsd_iget(sb, datap, len) ;
if (IS_ERR(result)
|| !(result->d_flags & DCACHE_NFSD_DISCONNECTED)
|| (!S_ISDIR(result->d_inode->i_mode) && ! needpath)) {
@@ -378,37 +440,36 @@
/* It's a directory, or we are required to confirm the file's
* location in the tree.
*/
- dprintk("nfs_fh: need to look harder for %d/%ld\n",sb->s_dev,ino);
+ dprintk("nfs_fh: need to look harder for %d/%ld\n",sb->s_dev,result->d_inode->i_ino);

found = 0;
if (!S_ISDIR(result->d_inode->i_mode)) {
nfsdstats.fh_nocache_nondir++;
- if (dirino == 0)
- goto err_result; /* don't know how to find parent */
- else {
- /* need to iget dirino and make sure this inode is in that directory */
- dentry = nfsd_iget(sb, dirino, 0);
- err = PTR_ERR(dentry);
- if (IS_ERR(dentry))
- goto err_result;
- err = -ESTALE;
- if (!dentry->d_inode
- || !S_ISDIR(dentry->d_inode->i_mode)) {
- goto err_dentry;
- }
- if (!(dentry->d_flags & DCACHE_NFSD_DISCONNECTED))
- found = 1;
- tmp = splice(result, dentry);
- err = PTR_ERR(tmp);
- if (IS_ERR(tmp))
- goto err_dentry;
- if (tmp != result) {
- /* it is safe to just use tmp instead, but we must discard result first */
- d_drop(result);
- dput(result);
- result = tmp;
- /* If !found, then this is really wierd, but it shouldn't hurt */
- }
+ /* need to iget dirino and make sure this inode is in that
+ * directory . nfsd_parent_iget returns -ESTALE when the
+ * parent directory inum wasn't provided
+ */
+ dentry = nfsd_parent_iget(sb, datap, len) ;
+ err = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ goto err_result;
+ err = -ESTALE;
+ if (!dentry->d_inode
+ || !S_ISDIR(dentry->d_inode->i_mode)) {
+ goto err_dentry;
+ }
+ if (!(dentry->d_flags & DCACHE_NFSD_DISCONNECTED))
+ found = 1;
+ tmp = splice(result, dentry);
+ err = PTR_ERR(tmp);
+ if (IS_ERR(tmp))
+ goto err_dentry;
+ if (tmp != result) {
+ /* it is safe to just use tmp instead, but we must discard result first */
+ d_drop(result);
+ dput(result);
+ result = tmp;
+ /* If !found, then this is really wierd, but it shouldn't hurt */
}
} else {
nfsdstats.fh_nocache_dir++;
@@ -577,24 +638,36 @@
case 1:
if ((data_left-=2)<0) goto out;
dentry = find_fh_dentry(exp->ex_dentry->d_inode->i_sb,
- datap[0], datap[1],
- 0,
+ datap, 2,
!(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
break;
case 2:
+ /* NOTE, I'm overloading case 2 right now
+ * for both completely filesystem controlled
+ * and the standard filehandle. This means
+ * we might be using more than 3 ints in
+ * datap, and data_left might not be correct
+ * after this call.
+ *
+ * This looks ok right now, but needs to be
+ * fixed long term. It also means that
+ * if the FS stores things differently than
+ * the defaults, it can't use length < 4.
+ */
if ((data_left-=3)<0) goto out;
dentry = find_fh_dentry(exp->ex_dentry->d_inode->i_sb,
- datap[0], datap[1],
- datap[2],
+ datap, 3 + data_left,
!(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
break;
default: goto out;
}
} else {
-
+ __u32 tmp[3] ;
+ tmp[0] = fh->ofh_ino ;
+ tmp[1] = fh->ofh_generation ;
+ tmp[2] = fh->ofh_dirino ;
dentry = find_fh_dentry(exp->ex_dentry->d_inode->i_sb,
- fh->ofh_ino, fh->ofh_generation,
- fh->ofh_dirino,
+ tmp, 3,
!(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
}
if (IS_ERR(dentry)) {
@@ -703,9 +776,18 @@
__u32 **datapp, int maxsize)
{
__u32 *datap= *datapp;
+ struct super_block *sb = dentry->d_inode->i_sb ;
+
if (dentry == exp->ex_dentry)
return 0;
- /* if super_operations provides dentry_to_fh lookup, should use that */
+
+ /* use the provided FS provide func to fill the handle */
+ if (sb->s_op->fill_fh) {
+ int used ;
+ used = sb->s_op->fill_fh(dentry, datap, maxsize/sizeof(__u32)) ;
+ *datapp = datap + used ;
+ return 2 ;
+ }

*datap++ = ino_t_to_u32(dentry->d_inode->i_ino);
*datap++ = dentry->d_inode->i_generation;
diff -Nru a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
--- a/fs/reiserfs/inode.c Sun Apr 29 18:01:04 2001
+++ b/fs/reiserfs/inode.c Sun Apr 29 18:01:04 2001
@@ -1163,7 +1163,7 @@
return;
}
if (retval != ITEM_FOUND) {
- reiserfs_warning ("vs-13042: reiserfs_read_inode2: %K not found\n", &key);
+ /* a stale NFS handle can trigger this without it being an error */
pathrelse (&path_to_sd);
make_bad_inode(inode) ;
return;
@@ -1185,21 +1185,76 @@
if (!inode)
return inode ;

- if (is_bad_inode (inode)) {
- reiserfs_warning ("vs-13048: reiserfs_iget: "
- "bad_inode. Stat data of (%lu %lu) not found\n",
- key->on_disk_key.k_dir_id, key->on_disk_key.k_objectid);
- iput (inode);
- inode = 0;
- } else if (comp_short_keys (INODE_PKEY (inode), key)) {
- reiserfs_warning ("vs-13049: reiserfs_iget: "
- "Looking for (%lu %lu), found inode of (%lu %lu)\n",
- key->on_disk_key.k_dir_id, key->on_disk_key.k_objectid,
- INODE_PKEY (inode)->k_dir_id, INODE_PKEY (inode)->k_objectid);
+ if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
+ /* either due to i/o error or a stale NFS handle */
iput (inode);
inode = 0;
}
return inode;
+}
+
+struct inode *reiserfs_inode_from_fh(struct super_block *sb, __u32 *data,
+ int len) {
+ struct cpu_key key ;
+ struct inode *inode = NULL ;
+
+ if (len < 2)
+ goto out ;
+
+ /* this works for handles from old kernels because the default
+ ** reiserfs generation number is the packing locality.
+ */
+ key.on_disk_key.k_objectid = data[0] ;
+ key.on_disk_key.k_dir_id = data[1] ;
+ inode = reiserfs_iget(sb, &key) ;
+
+out:
+ if (!inode)
+ return ERR_PTR(-ESTALE) ;
+ return inode ;
+}
+
+struct inode *reiserfs_parent_from_fh(struct super_block *sb, __u32 *data,
+ int len) {
+ struct cpu_key key ;
+ struct inode *inode ;
+
+ /*
+ ** Make sure the handle was long enough to store the parent directory
+ ** information. This also handles the case where an old
+ ** kernel (no filehandle interface) setup this filehandle, they use
+ ** a length of 3. Either way, we don't have enough info to find the
+ ** directory.
+ */
+ if (len < 4)
+ return ERR_PTR(-ESTALE) ;
+
+ key.on_disk_key.k_objectid = data[2] ;
+ key.on_disk_key.k_dir_id = data[3] ;
+ inode = reiserfs_iget(sb, &key) ;
+
+ if (!inode)
+ return ERR_PTR(-ESTALE) ;
+ return inode ;
+}
+
+int reiserfs_fill_fh(struct dentry *dentry, __u32 *data, int maxlen) {
+ struct inode *inode = dentry->d_inode ;
+
+ if (maxlen < 2)
+ return -ENOMEM ;
+
+ data[0] = inode->i_ino ;
+ data[1] = le32_to_cpu(INODE_PKEY (inode)->k_dir_id) ;
+
+ /* no room for directory info? return what we've stored so far */
+ if (maxlen < 4)
+ return 2 ;
+
+ inode = dentry->d_parent->d_inode ;
+ data[2] = inode->i_ino ;
+ data[3] = le32_to_cpu(INODE_PKEY (inode)->k_dir_id) ;
+ return 4;
}


diff -Nru a/fs/reiserfs/super.c b/fs/reiserfs/super.c
--- a/fs/reiserfs/super.c Sun Apr 29 18:01:04 2001
+++ b/fs/reiserfs/super.c Sun Apr 29 18:01:04 2001
@@ -148,7 +148,9 @@
unlockfs: reiserfs_unlockfs,
statfs: reiserfs_statfs,
remount_fs: reiserfs_remount,
-
+ fill_fh: reiserfs_fill_fh,
+ inode_from_fh: reiserfs_inode_from_fh,
+ parent_from_fh: reiserfs_parent_from_fh,
};

/* this was (ext2)parse_options */
diff -Nru a/include/linux/fs.h b/include/linux/fs.h
--- a/include/linux/fs.h Sun Apr 29 18:01:04 2001
+++ b/include/linux/fs.h Sun Apr 29 18:01:04 2001
@@ -820,6 +820,9 @@
int (*remount_fs) (struct super_block *, int *, char *);
void (*clear_inode) (struct inode *);
void (*umount_begin) (struct super_block *);
+ int (*fill_fh) (struct dentry *, __u32 *fh, int size);
+ struct inode * (*inode_from_fh) (struct super_block *, __u32 *, int);
+ struct inode * (*parent_from_fh) (struct super_block *, __u32 *, int);
};

/* Inode state bits.. */
diff -Nru a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
--- a/include/linux/reiserfs_fs.h Sun Apr 29 18:01:04 2001
+++ b/include/linux/reiserfs_fs.h Sun Apr 29 18:01:04 2001
@@ -1806,6 +1806,11 @@
extern int reiserfs_notify_change(struct dentry * dentry, struct iattr * attr);
void reiserfs_write_inode (struct inode * inode, int) ;

+/* nfs support funcs */
+int reiserfs_fill_fh(struct dentry *, __u32 *fh, int size);
+struct inode *reiserfs_inode_from_fh(struct super_block *, __u32 *, int);
+struct inode *reiserfs_parent_from_fh(struct super_block *, __u32 *, int);
+
/* we don't mark inodes dirty, we just log them */
void reiserfs_dirty_inode (struct inode * inode) ;

-
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