[GFS2] The core of GFS2

This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1265 insertions, 0 deletions

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
new file mode 100644
index 000000000000..d0f90b88380c
--- /dev/null
+++ b/fs/gfs2/ops_inode.c
@@ -0,0 +1,1265 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/namei.h>
+#include <linux/utsname.h>
+#include <linux/mm.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "eaops.h"
+#include "eattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "ops_dentry.h"
+#include "ops_inode.h"
+#include "page.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "unlinked.h"
+
+/**
+ * gfs2_create - Create a file
+ * @dir: The directory in which to create the file
+ * @dentry: The dentry of the new file
+ * @mode: The mode of the new file
+ *
+ * Returns: errno
+ */
+
+static int gfs2_create(struct inode *dir, struct dentry *dentry,
+                       int mode, struct nameidata *nd)
+{
+        struct gfs2_inode *dip = get_v2ip(dir), *ip;
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_holder ghs[2];
+        struct inode *inode;
+        int new = 1;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+        for (;;) {
+                error = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
+                if (!error) {
+                        ip = get_gl2ip(ghs[1].gh_gl);
+                        gfs2_trans_end(sdp);
+                        if (dip->i_alloc.al_rgd)
+                                gfs2_inplace_release(dip);
+                        gfs2_quota_unlock(dip);
+                        gfs2_alloc_put(dip);
+                        gfs2_glock_dq_uninit_m(2, ghs);
+                        break;
+                } else if (error != -EEXIST ||
+                           (nd->intent.open.flags & O_EXCL)) {
+                        gfs2_holder_uninit(ghs);
+                        return error;
+                }
+
+                error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
+                if (!error) {
+                        new = 0;
+                        gfs2_holder_uninit(ghs);
+                        break;
+                } else if (error != -ENOENT) {
+                        gfs2_holder_uninit(ghs);
+                        return error;
+                }
+        }
+
+        inode = gfs2_ip2v(ip);
+        gfs2_inode_put(ip);
+
+        if (!inode)
+                return -ENOMEM;
+
+        d_instantiate(dentry, inode);
+        if (new)
+                mark_inode_dirty(inode);
+
+        return 0;
+}
+
+/**
+ * gfs2_lookup - Look up a filename in a directory and return its inode
+ * @dir: The directory inode
+ * @dentry: The dentry of the new inode
+ * @nd: passed from Linux VFS, ignored by us
+ *
+ * Called by the VFS layer. Lock dir and call gfs2_lookupi()
+ *
+ * Returns: errno
+ */
+
+static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
+                                  struct nameidata *nd)
+{
+        struct gfs2_inode *dip = get_v2ip(dir), *ip;
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct inode *inode = NULL;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        if (!sdp->sd_args.ar_localcaching)
+                dentry->d_op = &gfs2_dops;
+
+        error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
+        if (!error) {
+                inode = gfs2_ip2v(ip);
+                gfs2_inode_put(ip);
+                if (!inode)
+                        return ERR_PTR(-ENOMEM);
+
+        } else if (error != -ENOENT)
+                return ERR_PTR(error);
+
+        if (inode)
+                return d_splice_alias(inode, dentry);
+        d_add(dentry, inode);
+
+        return NULL;
+}
+
+/**
+ * gfs2_link - Link to a file
+ * @old_dentry: The inode to link
+ * @dir: Add link to this directory
+ * @dentry: The name of the link
+ *
+ * Link the inode in "old_dentry" into the directory "dir" with the
+ * name in "dentry".
+ *
+ * Returns: errno
+ */
+
+static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
+                     struct dentry *dentry)
+{
+        struct gfs2_inode *dip = get_v2ip(dir);
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct inode *inode = old_dentry->d_inode;
+        struct gfs2_inode *ip = get_v2ip(inode);
+        struct gfs2_holder ghs[2];
+        int alloc_required;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        if (S_ISDIR(ip->i_di.di_mode))
+                return -EPERM;
+
+        gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+        error = gfs2_glock_nq_m(2, ghs);
+        if (error)
+                goto out;
+
+        error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL);
+        if (error)
+                goto out_gunlock;
+
+        error = gfs2_dir_search(dip, &dentry->d_name, NULL, NULL);
+        switch (error) {
+        case -ENOENT:
+                break;
+        case 0:
+                error = -EEXIST;
+        default:
+                goto out_gunlock;
+        }
+
+        error = -EINVAL;
+        if (!dip->i_di.di_nlink)
+                goto out_gunlock;
+        error = -EFBIG;
+        if (dip->i_di.di_entries == (uint32_t)-1)
+                goto out_gunlock;
+        error = -EPERM;
+        if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+                goto out_gunlock;
+        error = -EINVAL;
+        if (!ip->i_di.di_nlink)
+                goto out_gunlock;
+        error = -EMLINK;
+        if (ip->i_di.di_nlink == (uint32_t)-1)
+                goto out_gunlock;
+
+        error = gfs2_diradd_alloc_required(dip, &dentry->d_name,
+                                           &alloc_required);
+        if (error)
+                goto out_gunlock;
+
+        if (alloc_required) {
+                struct gfs2_alloc *al = gfs2_alloc_get(dip);
+
+                error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+                if (error)
+                        goto out_alloc;
+
+                error = gfs2_quota_check(dip, dip->i_di.di_uid,
+                                         dip->i_di.di_gid);
+                if (error)
+                        goto out_gunlock_q;
+
+                al->al_requested = sdp->sd_max_dirres;
+
+                error = gfs2_inplace_reserve(dip);
+                if (error)
+                        goto out_gunlock_q;
+
+                error = gfs2_trans_begin(sdp,
+                                         sdp->sd_max_dirres +
+                                         al->al_rgd->rd_ri.ri_length +
+                                         2 * RES_DINODE + RES_STATFS +
+                                         RES_QUOTA, 0);
+                if (error)
+                        goto out_ipres;
+        } else {
+                error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
+                if (error)
+                        goto out_ipres;
+        }
+
+        error = gfs2_dir_add(dip, &dentry->d_name, &ip->i_num,
+                             IF2DT(ip->i_di.di_mode));
+        if (error)
+                goto out_end_trans;
+
+        error = gfs2_change_nlink(ip, +1);
+
+ out_end_trans:
+        gfs2_trans_end(sdp);
+
+ out_ipres:
+        if (alloc_required)
+                gfs2_inplace_release(dip);
+
+ out_gunlock_q:
+        if (alloc_required)
+                gfs2_quota_unlock(dip);
+
+ out_alloc:
+        if (alloc_required)
+                gfs2_alloc_put(dip);
+
+ out_gunlock:
+        gfs2_glock_dq_m(2, ghs);
+
+ out:
+        gfs2_holder_uninit(ghs);
+        gfs2_holder_uninit(ghs + 1);
+
+        if (!error) {
+                atomic_inc(&inode->i_count);
+                d_instantiate(dentry, inode);
+                mark_inode_dirty(inode);
+        }
+
+        return error;
+}
+
+/**
+ * gfs2_unlink - Unlink a file
+ * @dir: The inode of the directory containing the file to unlink
+ * @dentry: The file itself
+ *
+ * Unlink a file.  Call gfs2_unlinki()
+ *
+ * Returns: errno
+ */
+
+static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
+{
+        struct gfs2_inode *dip = get_v2ip(dir);
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
+        struct gfs2_unlinked *ul;
+        struct gfs2_holder ghs[2];
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        error = gfs2_unlinked_get(sdp, &ul);
+        if (error)
+                return error;
+
+        gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+        error = gfs2_glock_nq_m(2, ghs);
+        if (error)
+                goto out;
+
+        error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
+        if (error)
+                goto out_gunlock;
+
+        error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF +
+                                RES_UNLINKED, 0);
+        if (error)
+                goto out_gunlock;
+
+        error = gfs2_unlinki(dip, &dentry->d_name, ip,ul);
+
+        gfs2_trans_end(sdp);
+
+ out_gunlock:
+        gfs2_glock_dq_m(2, ghs);
+
+ out:
+        gfs2_holder_uninit(ghs);
+        gfs2_holder_uninit(ghs + 1);
+
+        gfs2_unlinked_put(sdp, ul);
+
+        return error;
+}
+
+/**
+ * gfs2_symlink - Create a symlink
+ * @dir: The directory to create the symlink in
+ * @dentry: The dentry to put the symlink in
+ * @symname: The thing which the link points to
+ *
+ * Returns: errno
+ */
+
+static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
+                        const char *symname)
+{
+        struct gfs2_inode *dip = get_v2ip(dir), *ip;
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_holder ghs[2];
+        struct inode *inode;
+        struct buffer_head *dibh;
+        int size;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        /* Must be stuffed with a null terminator for gfs2_follow_link() */
+        size = strlen(symname);
+        if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
+                return -ENAMETOOLONG;
+
+        gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+        error = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
+        if (error) {
+                gfs2_holder_uninit(ghs);
+                return error;
+        }
+
+        ip = get_gl2ip(ghs[1].gh_gl);
+
+        ip->i_di.di_size = size;
+
+        error = gfs2_meta_inode_buffer(ip, &dibh);
+
+        if (!gfs2_assert_withdraw(sdp, !error)) {
+                gfs2_dinode_out(&ip->i_di, dibh->b_data);
+                memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
+                       size);
+                brelse(dibh);
+        }
+
+        gfs2_trans_end(sdp);
+        if (dip->i_alloc.al_rgd)
+                gfs2_inplace_release(dip);
+        gfs2_quota_unlock(dip);
+        gfs2_alloc_put(dip);
+
+        gfs2_glock_dq_uninit_m(2, ghs);
+
+        inode = gfs2_ip2v(ip);
+        gfs2_inode_put(ip);
+
+        if (!inode)
+                return -ENOMEM;
+
+        d_instantiate(dentry, inode);
+        mark_inode_dirty(inode);
+
+        return 0;
+}
+
+/**
+ * gfs2_mkdir - Make a directory
+ * @dir: The parent directory of the new one
+ * @dentry: The dentry of the new directory
+ * @mode: The mode of the new directory
+ *
+ * Returns: errno
+ */
+
+static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+        struct gfs2_inode *dip = get_v2ip(dir), *ip;
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_holder ghs[2];
+        struct inode *inode;
+        struct buffer_head *dibh;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+        error = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
+        if (error) {
+                gfs2_holder_uninit(ghs);
+                return error;
+        }
+
+        ip = get_gl2ip(ghs[1].gh_gl);
+
+        ip->i_di.di_nlink = 2;
+        ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
+        ip->i_di.di_flags |= GFS2_DIF_JDATA;
+        ip->i_di.di_payload_format = GFS2_FORMAT_DE;
+        ip->i_di.di_entries = 2;
+
+        error = gfs2_meta_inode_buffer(ip, &dibh);
+
+        if (!gfs2_assert_withdraw(sdp, !error)) {
+                struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
+                struct gfs2_dirent *dent;
+
+                gfs2_dirent_alloc(ip, dibh, 1, &dent);
+
+                dent->de_inum = di->di_num; /* already GFS2 endian */
+                dent->de_hash = gfs2_disk_hash(".", 1);
+                dent->de_hash = cpu_to_be32(dent->de_hash);
+                dent->de_type = DT_DIR;
+                memcpy((char *) (dent + 1), ".", 1);
+                di->di_entries = cpu_to_be32(1);
+
+                gfs2_dirent_alloc(ip, dibh, 2, &dent);
+
+                gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
+                dent->de_hash = gfs2_disk_hash("..", 2);
+                dent->de_hash = cpu_to_be32(dent->de_hash);
+                dent->de_type = DT_DIR;
+                memcpy((char *) (dent + 1), "..", 2);
+
+                gfs2_dinode_out(&ip->i_di, (char *)di);
+
+                brelse(dibh);
+        }
+
+        error = gfs2_change_nlink(dip, +1);
+        gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
+
+        gfs2_trans_end(sdp);
+        if (dip->i_alloc.al_rgd)
+                gfs2_inplace_release(dip);
+        gfs2_quota_unlock(dip);
+        gfs2_alloc_put(dip);
+
+        gfs2_glock_dq_uninit_m(2, ghs);
+
+        inode = gfs2_ip2v(ip);
+        gfs2_inode_put(ip);
+
+        if (!inode)
+                return -ENOMEM;
+
+        d_instantiate(dentry, inode);
+        mark_inode_dirty(inode);
+
+        return 0;
+}
+
+/**
+ * gfs2_rmdir - Remove a directory
+ * @dir: The parent directory of the directory to be removed
+ * @dentry: The dentry of the directory to remove
+ *
+ * Remove a directory. Call gfs2_rmdiri()
+ *
+ * Returns: errno
+ */
+
+static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
+{
+        struct gfs2_inode *dip = get_v2ip(dir);
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
+        struct gfs2_unlinked *ul;
+        struct gfs2_holder ghs[2];
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        error = gfs2_unlinked_get(sdp, &ul);
+        if (error)
+                return error;
+
+        gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+        error = gfs2_glock_nq_m(2, ghs);
+        if (error)
+                goto out;
+
+        error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
+        if (error)
+                goto out_gunlock;
+
+        if (ip->i_di.di_entries < 2) {
+                if (gfs2_consist_inode(ip))
+                        gfs2_dinode_print(&ip->i_di);
+                error = -EIO;
+                goto out_gunlock;
+        }
+        if (ip->i_di.di_entries > 2) {
+                error = -ENOTEMPTY;
+                goto out_gunlock;
+        }
+
+        error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF +
+                                RES_UNLINKED, 0);
+        if (error)
+                goto out_gunlock;
+
+        error = gfs2_rmdiri(dip, &dentry->d_name, ip, ul);
+
+        gfs2_trans_end(sdp);
+
+ out_gunlock:
+        gfs2_glock_dq_m(2, ghs);
+
+ out:
+        gfs2_holder_uninit(ghs);
+        gfs2_holder_uninit(ghs + 1);
+
+        gfs2_unlinked_put(sdp, ul);
+
+        return error;
+}
+
+/**
+ * gfs2_mknod - Make a special file
+ * @dir: The directory in which the special file will reside
+ * @dentry: The dentry of the special file
+ * @mode: The mode of the special file
+ * @rdev: The device specification of the special file
+ *
+ */
+
+static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                      dev_t dev)
+{
+        struct gfs2_inode *dip = get_v2ip(dir), *ip;
+        struct gfs2_sbd *sdp = dip->i_sbd;
+        struct gfs2_holder ghs[2];
+        struct inode *inode;
+        struct buffer_head *dibh;
+        uint32_t major = 0, minor = 0;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        switch (mode & S_IFMT) {
+        case S_IFBLK:
+        case S_IFCHR:
+                major = MAJOR(dev);
+                minor = MINOR(dev);
+                break;
+        case S_IFIFO:
+        case S_IFSOCK:
+                break;
+        default:
+                return -EOPNOTSUPP;             
+        };
+
+        gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+        error = gfs2_createi(ghs, &dentry->d_name, mode);
+        if (error) {
+                gfs2_holder_uninit(ghs);
+                return error;
+        }
+
+        ip = get_gl2ip(ghs[1].gh_gl);
+
+        ip->i_di.di_major = major;
+        ip->i_di.di_minor = minor;
+
+        error = gfs2_meta_inode_buffer(ip, &dibh);
+
+        if (!gfs2_assert_withdraw(sdp, !error)) {
+                gfs2_dinode_out(&ip->i_di, dibh->b_data);
+                brelse(dibh);
+        }
+
+        gfs2_trans_end(sdp);
+        if (dip->i_alloc.al_rgd)
+                gfs2_inplace_release(dip);
+        gfs2_quota_unlock(dip);
+        gfs2_alloc_put(dip);
+
+        gfs2_glock_dq_uninit_m(2, ghs);
+
+        inode = gfs2_ip2v(ip);
+        gfs2_inode_put(ip);
+
+        if (!inode)
+                return -ENOMEM;
+
+        d_instantiate(dentry, inode);
+        mark_inode_dirty(inode);
+
+        return 0;
+}
+
+/**
+ * gfs2_rename - Rename a file
+ * @odir: Parent directory of old file name
+ * @odentry: The old dentry of the file
+ * @ndir: Parent directory of new file name
+ * @ndentry: The new dentry of the file
+ *
+ * Returns: errno
+ */
+
+static int gfs2_rename(struct inode *odir, struct dentry *odentry,
+                       struct inode *ndir, struct dentry *ndentry)
+{
+        struct gfs2_inode *odip = get_v2ip(odir);
+        struct gfs2_inode *ndip = get_v2ip(ndir);
+        struct gfs2_inode *ip = get_v2ip(odentry->d_inode);
+        struct gfs2_inode *nip = NULL;
+        struct gfs2_sbd *sdp = odip->i_sbd;
+        struct gfs2_unlinked *ul;
+        struct gfs2_holder ghs[4], r_gh;
+        unsigned int num_gh;
+        int dir_rename = 0;
+        int alloc_required;
+        unsigned int x;
+        int error;
+
+        atomic_inc(&sdp->sd_ops_inode);
+
+        if (ndentry->d_inode) {
+                nip = get_v2ip(ndentry->d_inode);
+                if (ip == nip)
+                        return 0;
+        }
+
+        error = gfs2_unlinked_get(sdp, &ul);
+        if (error)
+                return error;
+
+        /* Make sure we aren't trying to move a dirctory into it's subdir */
+
+        if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
+                dir_rename = 1;
+
+                error = gfs2_glock_nq_init(sdp->sd_rename_gl,
+                                           LM_ST_EXCLUSIVE, 0,
+                                           &r_gh);
+                if (error)
+                        goto out;
+
+                error = gfs2_ok_to_move(ip, ndip);
+                if (error)
+                        goto out_gunlock_r;
+        }
+
+        gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+        gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
+        num_gh = 3;
+
+        if (nip)
+                gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
+
+        error = gfs2_glock_nq_m(num_gh, ghs);
+        if (error)
+                goto out_uninit;
+
+        /* Check out the old directory */
+
+        error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
+        if (error)
+                goto out_gunlock;
+
+        /* Check out the new directory */
+
+        if (nip) {
+                error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
+                if (error)
+                        goto out_gunlock;
+
+                if (S_ISDIR(nip->i_di.di_mode)) {
+                        if (nip->i_di.di_entries < 2) {
+                                if (gfs2_consist_inode(nip))
+                                        gfs2_dinode_print(&nip->i_di);
+                                error = -EIO;
+                                goto out_gunlock;
+                        }
+                        if (nip->i_di.di_entries > 2) {
+                                error = -ENOTEMPTY;
+                                goto out_gunlock;
+                        }
+                }
+        } else {
+                error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL);
+                if (error)
+                        goto out_gunlock;
+
+                error = gfs2_dir_search(ndip, &ndentry->d_name, NULL, NULL);
+                switch (error) {
+                case -ENOENT:
+                        error = 0;
+                        break;
+                case 0:
+                        error = -EEXIST;
+                default:
+                        goto out_gunlock;
+                };
+
+                if (odip != ndip) {
+                        if (!ndip->i_di.di_nlink) {
+                                error = -EINVAL;
+                                goto out_gunlock;
+                        }
+                        if (ndip->i_di.di_entries == (uint32_t)-1) {
+                                error = -EFBIG;
+                                goto out_gunlock;
+                        }
+                        if (S_ISDIR(ip->i_di.di_mode) &&
+                            ndip->i_di.di_nlink == (uint32_t)-1) {
+                                error = -EMLINK;
+                                goto out_gunlock;
+                        }
+                }
+        }
+
+        /* Check out the dir to be renamed */
+
+        if (dir_rename) {
+                error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL);
+                if (error)
+                        goto out_gunlock;
+        }
+
+        error = gfs2_diradd_alloc_required(ndip, &ndentry->d_name,
+                                           &alloc_required);
+        if (error)
+                goto out_gunlock;
+
+        if (alloc_required) {
+                struct gfs2_alloc *al = gfs2_alloc_get(ndip);
+
+                error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+                if (error)
+                        goto out_alloc;
+
+                error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
+                                         ndip->i_di.di_gid);
+                if (error)
+                        goto out_gunlock_q;
+
+                al->al_requested = sdp->sd_max_dirres;
+
+                error = gfs2_inplace_reserve(ndip);
+                if (error)
+                        goto out_gunlock_q;
+
+                error = gfs2_trans_begin(sdp,
+                                         sdp->sd_max_dirres +
+                                         al->al_rgd->rd_ri.ri_length +
+                                         4 * RES_DINODE + 4 * RES_LEAF +
+                                         RES_UNLINKED + RES_STATFS +
+                                         RES_QUOTA, 0);
+                if (error)
+                        goto out_ipreserv;
+        } else {
+                error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
+                                         5 * RES_LEAF +
+                                         RES_UNLINKED, 0);
+                if (error)
+                        goto out_gunlock;
+        }
+
+        /* Remove the target file, if it exists */
+
+        if (nip) {
+                if (S_ISDIR(nip->i_di.di_mode))
+                        error = gfs2_rmdiri(ndip, &ndentry->d_name, nip, ul);
+                else
+                        error = gfs2_unlinki(ndip, &ndentry->d_name, nip, ul);
+                if (error)
+                        goto out_end_trans;
+        }
+
+        if (dir_rename) {
+                struct qstr name;
+                name.len = 2;
+                name.name = "..";
+
+                error = gfs2_change_nlink(ndip, +1);
+                if (error)
+                        goto out_end_trans;
+                error = gfs2_change_nlink(odip, -1);
+                if (error)
+                        goto out_end_trans;
+
+                error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
+                if (error)
+                        goto out_end_trans;
+        } else {
+                struct buffer_head *dibh;
+                error = gfs2_meta_inode_buffer(ip, &dibh);
+                if (error)
+                        goto out_end_trans;
+                ip->i_di.di_ctime = get_seconds();
+                gfs2_trans_add_bh(ip->i_gl, dibh);
+                gfs2_dinode_out(&ip->i_di, dibh->b_data);
+                brelse(dibh);
+        }
+
+        error = gfs2_dir_del(odip, &odentry->d_name);
+        if (error)
+                goto out_end_trans;
+
+        error = gfs2_dir_add(ndip, &ndentry->d_name, &ip->i_num,
+                             IF2DT(ip->i_di.di_mode));
+        if (error)
+                goto out_end_trans;
+
+ out_end_trans:
+        gfs2_trans_end(sdp);
+
+ out_ipreserv:
+        if (alloc_required)
+                gfs2_inplace_release(ndip);
+
+ out_gunlock_q:
+        if (alloc_required)
+                gfs2_quota_unlock(ndip);
+
+ out_alloc:
+        if (alloc_required)
+                gfs2_alloc_put(ndip);
+
+ out_gunlock:
+        gfs2_glock_dq_m(num_gh, ghs);
+
+ out_uninit:
+        for (x = 0; x < num_gh; x++)
+                gfs2_holder_uninit(ghs + x);
+
+ out_gunlock_r:
+        if (dir_rename)
+                gfs2_glock_dq_uninit(&r_gh);
+
+ out:
+        gfs2_unlinked_put(sdp, ul);
+
+        return error;
+}
+
+/**
+ * gfs2_readlink - Read the value of a symlink
+ * @dentry: the symlink
+ * @buf: the buffer to read the symlink data into
+ * @size: the size of the buffer
+ *
+ * Returns: errno
+ */
+
+static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
+                         int user_size)
+{
+        struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
+        char array[GFS2_FAST_NAME_SIZE], *buf = array;
+        unsigned int len = GFS2_FAST_NAME_SIZE;
+        int error;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        error = gfs2_readlinki(ip, &buf, &len);
+        if (error)
+                return error;
+
+        if (user_size > len - 1)
+                user_size = len - 1;
+
+        if (copy_to_user(user_buf, buf, user_size))
+                error = -EFAULT;
+        else
+                error = user_size;
+
+        if (buf != array)
+                kfree(buf);
+
+        return error;
+}
+
+/**
+ * gfs2_follow_link - Follow a symbolic link
+ * @dentry: The dentry of the link
+ * @nd: Data that we pass to vfs_follow_link()
+ *
+ * This can handle symlinks of any size. It is optimised for symlinks
+ * under GFS2_FAST_NAME_SIZE.
+ *
+ * Returns: 0 on success or error code
+ */
+
+static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+        struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
+        char array[GFS2_FAST_NAME_SIZE], *buf = array;
+        unsigned int len = GFS2_FAST_NAME_SIZE;
+        int error;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        error = gfs2_readlinki(ip, &buf, &len);
+        if (!error) {
+                error = vfs_follow_link(nd, buf);
+                if (buf != array)
+                        kfree(buf);
+        }
+
+        return ERR_PTR(error);
+}
+
+/**
+ * gfs2_permission -
+ * @inode:
+ * @mask:
+ * @nd: passed from Linux VFS, ignored by us
+ *
+ * Returns: errno
+ */
+
+static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+        struct gfs2_inode *ip = get_v2ip(inode);
+        struct gfs2_holder i_gh;
+        int error;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        if (ip->i_vn == ip->i_gl->gl_vn)
+                return generic_permission(inode, mask, gfs2_check_acl);
+
+        error = gfs2_glock_nq_init(ip->i_gl,
+                                   LM_ST_SHARED, LM_FLAG_ANY,
+                                   &i_gh);
+        if (!error) {
+                error = generic_permission(inode, mask, gfs2_check_acl_locked);
+                gfs2_glock_dq_uninit(&i_gh);
+        }
+
+        return error;
+}
+
+static int setattr_size(struct inode *inode, struct iattr *attr)
+{
+        struct gfs2_inode *ip = get_v2ip(inode);
+        int error;
+
+        if (attr->ia_size != ip->i_di.di_size) {
+                error = vmtruncate(inode, attr->ia_size);
+                if (error)
+                        return error;
+        }
+
+        error = gfs2_truncatei(ip, attr->ia_size, gfs2_truncator_page);
+        if (error)
+                return error;
+
+        return error;
+}
+
+static int setattr_chown(struct inode *inode, struct iattr *attr)
+{
+        struct gfs2_inode *ip = get_v2ip(inode);
+        struct gfs2_sbd *sdp = ip->i_sbd;
+        struct buffer_head *dibh;
+        uint32_t ouid, ogid, nuid, ngid;
+        int error;
+
+        ouid = ip->i_di.di_uid;
+        ogid = ip->i_di.di_gid;
+        nuid = attr->ia_uid;
+        ngid = attr->ia_gid;
+
+        if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
+                ouid = nuid = NO_QUOTA_CHANGE;
+        if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
+                ogid = ngid = NO_QUOTA_CHANGE;
+
+        gfs2_alloc_get(ip);
+
+        error = gfs2_quota_lock(ip, nuid, ngid);
+        if (error)
+                goto out_alloc;
+
+        if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+                error = gfs2_quota_check(ip, nuid, ngid);
+                if (error)
+                        goto out_gunlock_q;
+        }
+
+        error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
+        if (error)
+                goto out_gunlock_q;
+
+        error = gfs2_meta_inode_buffer(ip, &dibh);
+        if (error)
+                goto out_end_trans;
+
+        error = inode_setattr(inode, attr);
+        gfs2_assert_warn(sdp, !error);
+        gfs2_inode_attr_out(ip);
+
+        gfs2_trans_add_bh(ip->i_gl, dibh);
+        gfs2_dinode_out(&ip->i_di, dibh->b_data);
+        brelse(dibh);
+
+        if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+                gfs2_quota_change(ip, -ip->i_di.di_blocks,
+                                 ouid, ogid);
+                gfs2_quota_change(ip, ip->i_di.di_blocks,
+                                 nuid, ngid);
+        }
+
+ out_end_trans:
+        gfs2_trans_end(sdp);
+
+ out_gunlock_q:
+        gfs2_quota_unlock(ip);
+
+ out_alloc:
+        gfs2_alloc_put(ip);
+
+        return error;
+}
+
+/**
+ * gfs2_setattr - Change attributes on an inode
+ * @dentry: The dentry which is changing
+ * @attr: The structure describing the change
+ *
+ * The VFS layer wants to change one or more of an inodes attributes.  Write
+ * that change out to disk.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
+{
+        struct inode *inode = dentry->d_inode;
+        struct gfs2_inode *ip = get_v2ip(inode);
+        struct gfs2_holder i_gh;
+        int error;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+        if (error)
+                return error;
+
+        error = -EPERM;
+        if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+                goto out;
+
+        error = inode_change_ok(inode, attr);
+        if (error)
+                goto out;
+
+        if (attr->ia_valid & ATTR_SIZE)
+                error = setattr_size(inode, attr);
+        else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
+                error = setattr_chown(inode, attr);
+        else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
+                error = gfs2_acl_chmod(ip, attr);
+        else
+                error = gfs2_setattr_simple(ip, attr);
+
+ out:
+        gfs2_glock_dq_uninit(&i_gh);
+
+        if (!error)
+                mark_inode_dirty(inode);
+
+        return error;
+}
+
+/**
+ * gfs2_getattr - Read out an inode's attributes
+ * @mnt: ?
+ * @dentry: The dentry to stat
+ * @stat: The inode's stats
+ *
+ * Returns: errno
+ */
+
+static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                        struct kstat *stat)
+{
+        struct inode *inode = dentry->d_inode;
+        struct gfs2_inode *ip = get_v2ip(inode);
+        struct gfs2_holder gh;
+        int error;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+        if (!error) {
+                generic_fillattr(inode, stat);
+                gfs2_glock_dq_uninit(&gh);
+        }
+
+        return error;
+}
+
+static int gfs2_setxattr(struct dentry *dentry, const char *name,
+                         const void *data, size_t size, int flags)
+{
+        struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
+        struct gfs2_ea_request er;
+
+        atomic_inc(&ip->i_sbd->sd_ops_inode);
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        er.er_type = gfs2_ea_name2type(name, &er.er_name);
+        if (er.er_type == GFS2_EATYPE_UNUSED)
+                return -EOPNOTSUPP;
+        er.er_data = (char *)data;
+        er.er_name_len = strlen(er.er_name);
+        er.er_data_len = size;
+        er.er_flags = flags;
+
+        gfs2_assert_warn(ip->i_sbd, !(er.er_flags & GFS2_ERF_MODE));
+
+        return gfs2_ea_set(ip, &er);
+}
+
+static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
+                             void *data, size_t size)
+{
+        struct gfs2_ea_request er;
+
+        atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        er.er_type = gfs2_ea_name2type(name, &er.er_name);
+        if (er.er_type == GFS2_EATYPE_UNUSED)
+                return -EOPNOTSUPP;
+        er.er_data = data;
+        er.er_name_len = strlen(er.er_name);
+        er.er_data_len = size;
+
+        return gfs2_ea_get(get_v2ip(dentry->d_inode), &er);
+}
+
+static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+        struct gfs2_ea_request er;
+
+        atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        er.er_data = (size) ? buffer : NULL;
+        er.er_data_len = size;
+
+        return gfs2_ea_list(get_v2ip(dentry->d_inode), &er);
+}
+
+static int gfs2_removexattr(struct dentry *dentry, const char *name)
+{
+        struct gfs2_ea_request er;
+
+        atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        er.er_type = gfs2_ea_name2type(name, &er.er_name);
+        if (er.er_type == GFS2_EATYPE_UNUSED)
+                return -EOPNOTSUPP;
+        er.er_name_len = strlen(er.er_name);
+
+        return gfs2_ea_remove(get_v2ip(dentry->d_inode), &er);
+}
+
+struct inode_operations gfs2_file_iops = {
+        .permission = gfs2_permission,
+        .setattr = gfs2_setattr,
+        .getattr = gfs2_getattr,
+        .setxattr = gfs2_setxattr,
+        .getxattr = gfs2_getxattr,
+        .listxattr = gfs2_listxattr,
+        .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_dev_iops = {
+        .permission = gfs2_permission,
+        .setattr = gfs2_setattr,
+        .getattr = gfs2_getattr,
+        .setxattr = gfs2_setxattr,
+        .getxattr = gfs2_getxattr,
+        .listxattr = gfs2_listxattr,
+        .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_dir_iops = {
+        .create = gfs2_create,
+        .lookup = gfs2_lookup,
+        .link = gfs2_link,
+        .unlink = gfs2_unlink,
+        .symlink = gfs2_symlink,
+        .mkdir = gfs2_mkdir,
+        .rmdir = gfs2_rmdir,
+        .mknod = gfs2_mknod,
+        .rename = gfs2_rename,
+        .permission = gfs2_permission,
+        .setattr = gfs2_setattr,
+        .getattr = gfs2_getattr,
+        .setxattr = gfs2_setxattr,
+        .getxattr = gfs2_getxattr,
+        .listxattr = gfs2_listxattr,
+        .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_symlink_iops = {
+        .readlink = gfs2_readlink,
+        .follow_link = gfs2_follow_link,
+        .permission = gfs2_permission,
+        .setattr = gfs2_setattr,
+        .getattr = gfs2_getattr,
+        .setxattr = gfs2_setxattr,
+        .getxattr = gfs2_getxattr,
+        .listxattr = gfs2_listxattr,
+        .removexattr = gfs2_removexattr,
+};
+