GFS2: Clean up some file names

This patch renames the ops_*.c files which have no counterpart
without the ops_ prefix in order to shorten the name and make
it more readable. In addition, ops_address.h (which was very
small) is moved into inode.h and inode.h is cleaned up by
adding extern where required.

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

1 files changed, 765 insertions, 0 deletions

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
new file mode 100644
index 000000000000..73b6f552f06d
--- /dev/null
+++ b/fs/gfs2/file.c
@@ -0,0 +1,765 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 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 version 2.
+ */
+
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/pagemap.h>
+#include <linux/uio.h>
+#include <linux/blkdev.h>
+#include <linux/mm.h>
+#include <linux/mount.h>
+#include <linux/fs.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/ext2_fs.h>
+#include <linux/crc32.h>
+#include <linux/writeback.h>
+#include <asm/uaccess.h>
+#include <linux/dlm.h>
+#include <linux/dlm_plock.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "bmap.h"
+#include "dir.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "util.h"
+#include "eaops.h"
+
+/**
+ * gfs2_llseek - seek to a location in a file
+ * @file: the file
+ * @offset: the offset
+ * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
+ *
+ * SEEK_END requires the glock for the file because it references the
+ * file's size.
+ *
+ * Returns: The new offset, or errno
+ */
+
+static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
+{
+        struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+        struct gfs2_holder i_gh;
+        loff_t error;
+
+        if (origin == 2) {
+                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
+                                           &i_gh);
+                if (!error) {
+                        error = generic_file_llseek_unlocked(file, offset, origin);
+                        gfs2_glock_dq_uninit(&i_gh);
+                }
+        } else
+                error = generic_file_llseek_unlocked(file, offset, origin);
+
+        return error;
+}
+
+/**
+ * gfs2_readdir - Read directory entries from a directory
+ * @file: The directory to read from
+ * @dirent: Buffer for dirents
+ * @filldir: Function used to do the copying
+ *
+ * Returns: errno
+ */
+
+static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+        struct inode *dir = file->f_mapping->host;
+        struct gfs2_inode *dip = GFS2_I(dir);
+        struct gfs2_holder d_gh;
+        u64 offset = file->f_pos;
+        int error;
+
+        gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+        error = gfs2_glock_nq(&d_gh);
+        if (error) {
+                gfs2_holder_uninit(&d_gh);
+                return error;
+        }
+
+        error = gfs2_dir_read(dir, &offset, dirent, filldir);
+
+        gfs2_glock_dq_uninit(&d_gh);
+
+        file->f_pos = offset;
+
+        return error;
+}
+
+/**
+ * fsflags_cvt
+ * @table: A table of 32 u32 flags
+ * @val: a 32 bit value to convert
+ *
+ * This function can be used to convert between fsflags values and
+ * GFS2's own flags values.
+ *
+ * Returns: the converted flags
+ */
+static u32 fsflags_cvt(const u32 *table, u32 val)
+{
+        u32 res = 0;
+        while(val) {
+                if (val & 1)
+                        res |= *table;
+                table++;
+                val >>= 1;
+        }
+        return res;
+}
+
+static const u32 fsflags_to_gfs2[32] = {
+        [3] = GFS2_DIF_SYNC,
+        [4] = GFS2_DIF_IMMUTABLE,
+        [5] = GFS2_DIF_APPENDONLY,
+        [7] = GFS2_DIF_NOATIME,
+        [12] = GFS2_DIF_EXHASH,
+        [14] = GFS2_DIF_INHERIT_JDATA,
+};
+
+static const u32 gfs2_to_fsflags[32] = {
+        [gfs2fl_Sync] = FS_SYNC_FL,
+        [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
+        [gfs2fl_AppendOnly] = FS_APPEND_FL,
+        [gfs2fl_NoAtime] = FS_NOATIME_FL,
+        [gfs2fl_ExHash] = FS_INDEX_FL,
+        [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
+};
+
+static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        struct gfs2_inode *ip = GFS2_I(inode);
+        struct gfs2_holder gh;
+        int error;
+        u32 fsflags;
+
+        gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
+        error = gfs2_glock_nq(&gh);
+        if (error)
+                return error;
+
+        fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
+        if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
+                fsflags |= FS_JOURNAL_DATA_FL;
+        if (put_user(fsflags, ptr))
+                error = -EFAULT;
+
+        gfs2_glock_dq(&gh);
+        gfs2_holder_uninit(&gh);
+        return error;
+}
+
+void gfs2_set_inode_flags(struct inode *inode)
+{
+        struct gfs2_inode *ip = GFS2_I(inode);
+        unsigned int flags = inode->i_flags;
+
+        flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
+        if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
+                flags |= S_IMMUTABLE;
+        if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
+                flags |= S_APPEND;
+        if (ip->i_diskflags & GFS2_DIF_NOATIME)
+                flags |= S_NOATIME;
+        if (ip->i_diskflags & GFS2_DIF_SYNC)
+                flags |= S_SYNC;
+        inode->i_flags = flags;
+}
+
+/* Flags that can be set by user space */
+#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA|                    \
+                             GFS2_DIF_IMMUTABLE|                \
+                             GFS2_DIF_APPENDONLY|               \
+                             GFS2_DIF_NOATIME|                  \
+                             GFS2_DIF_SYNC|                     \
+                             GFS2_DIF_SYSTEM|                   \
+                             GFS2_DIF_INHERIT_JDATA)
+
+/**
+ * gfs2_set_flags - set flags on an inode
+ * @inode: The inode
+ * @flags: The flags to set
+ * @mask: Indicates which flags are valid
+ *
+ */
+static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        struct gfs2_inode *ip = GFS2_I(inode);
+        struct gfs2_sbd *sdp = GFS2_SB(inode);
+        struct buffer_head *bh;
+        struct gfs2_holder gh;
+        int error;
+        u32 new_flags, flags;
+
+        error = mnt_want_write(filp->f_path.mnt);
+        if (error)
+                return error;
+
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+        if (error)
+                goto out_drop_write;
+
+        flags = ip->i_diskflags;
+        new_flags = (flags & ~mask) | (reqflags & mask);
+        if ((new_flags ^ flags) == 0)
+                goto out;
+
+        error = -EINVAL;
+        if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
+                goto out;
+
+        error = -EPERM;
+        if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
+                goto out;
+        if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
+                goto out;
+        if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
+            !capable(CAP_LINUX_IMMUTABLE))
+                goto out;
+        if (!IS_IMMUTABLE(inode)) {
+                error = gfs2_permission(inode, MAY_WRITE);
+                if (error)
+                        goto out;
+        }
+        if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
+                if (flags & GFS2_DIF_JDATA)
+                        gfs2_log_flush(sdp, ip->i_gl);
+                error = filemap_fdatawrite(inode->i_mapping);
+                if (error)
+                        goto out;
+                error = filemap_fdatawait(inode->i_mapping);
+                if (error)
+                        goto out;
+        }
+        error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+        if (error)
+                goto out;
+        error = gfs2_meta_inode_buffer(ip, &bh);
+        if (error)
+                goto out_trans_end;
+        gfs2_trans_add_bh(ip->i_gl, bh, 1);
+        ip->i_diskflags = new_flags;
+        gfs2_dinode_out(ip, bh->b_data);
+        brelse(bh);
+        gfs2_set_inode_flags(inode);
+        gfs2_set_aops(inode);
+out_trans_end:
+        gfs2_trans_end(sdp);
+out:
+        gfs2_glock_dq_uninit(&gh);
+out_drop_write:
+        mnt_drop_write(filp->f_path.mnt);
+        return error;
+}
+
+static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        u32 fsflags, gfsflags;
+        if (get_user(fsflags, ptr))
+                return -EFAULT;
+        gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
+        if (!S_ISDIR(inode->i_mode)) {
+                if (gfsflags & GFS2_DIF_INHERIT_JDATA)
+                        gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
+                return do_gfs2_set_flags(filp, gfsflags, ~0);
+        }
+        return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
+}
+
+static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        switch(cmd) {
+        case FS_IOC_GETFLAGS:
+                return gfs2_get_flags(filp, (u32 __user *)arg);
+        case FS_IOC_SETFLAGS:
+                return gfs2_set_flags(filp, (u32 __user *)arg);
+        }
+        return -ENOTTY;
+}
+
+/**
+ * gfs2_allocate_page_backing - Use bmap to allocate blocks
+ * @page: The (locked) page to allocate backing for
+ *
+ * We try to allocate all the blocks required for the page in
+ * one go. This might fail for various reasons, so we keep
+ * trying until all the blocks to back this page are allocated.
+ * If some of the blocks are already allocated, thats ok too.
+ */
+
+static int gfs2_allocate_page_backing(struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct buffer_head bh;
+        unsigned long size = PAGE_CACHE_SIZE;
+        u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+
+        do {
+                bh.b_state = 0;
+                bh.b_size = size;
+                gfs2_block_map(inode, lblock, &bh, 1);
+                if (!buffer_mapped(&bh))
+                        return -EIO;
+                size -= bh.b_size;
+                lblock += (bh.b_size >> inode->i_blkbits);
+        } while(size > 0);
+        return 0;
+}
+
+/**
+ * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
+ * @vma: The virtual memory area
+ * @page: The page which is about to become writable
+ *
+ * When the page becomes writable, we need to ensure that we have
+ * blocks allocated on disk to back that page.
+ */
+
+static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+        struct page *page = vmf->page;
+        struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+        struct gfs2_inode *ip = GFS2_I(inode);
+        struct gfs2_sbd *sdp = GFS2_SB(inode);
+        unsigned long last_index;
+        u64 pos = page->index << PAGE_CACHE_SHIFT;
+        unsigned int data_blocks, ind_blocks, rblocks;
+        int alloc_required = 0;
+        struct gfs2_holder gh;
+        struct gfs2_alloc *al;
+        int ret;
+
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+        ret = gfs2_glock_nq(&gh);
+        if (ret)
+                goto out;
+
+        set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
+        set_bit(GIF_SW_PAGED, &ip->i_flags);
+
+        ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
+        if (ret || !alloc_required)
+                goto out_unlock;
+        ret = -ENOMEM;
+        al = gfs2_alloc_get(ip);
+        if (al == NULL)
+                goto out_unlock;
+
+        ret = gfs2_quota_lock_check(ip);
+        if (ret)
+                goto out_alloc_put;
+        gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
+        al->al_requested = data_blocks + ind_blocks;
+        ret = gfs2_inplace_reserve(ip);
+        if (ret)
+                goto out_quota_unlock;
+
+        rblocks = RES_DINODE + ind_blocks;
+        if (gfs2_is_jdata(ip))
+                rblocks += data_blocks ? data_blocks : 1;
+        if (ind_blocks || data_blocks)
+                rblocks += RES_STATFS + RES_QUOTA;
+        ret = gfs2_trans_begin(sdp, rblocks, 0);
+        if (ret)
+                goto out_trans_fail;
+
+        lock_page(page);
+        ret = -EINVAL;
+        last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
+        if (page->index > last_index)
+                goto out_unlock_page;
+        ret = 0;
+        if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
+                goto out_unlock_page;
+        if (gfs2_is_stuffed(ip)) {
+                ret = gfs2_unstuff_dinode(ip, page);
+                if (ret)
+                        goto out_unlock_page;
+        }
+        ret = gfs2_allocate_page_backing(page);
+
+out_unlock_page:
+        unlock_page(page);
+        gfs2_trans_end(sdp);
+out_trans_fail:
+        gfs2_inplace_release(ip);
+out_quota_unlock:
+        gfs2_quota_unlock(ip);
+out_alloc_put:
+        gfs2_alloc_put(ip);
+out_unlock:
+        gfs2_glock_dq(&gh);
+out:
+        gfs2_holder_uninit(&gh);
+        if (ret == -ENOMEM)
+                ret = VM_FAULT_OOM;
+        else if (ret)
+                ret = VM_FAULT_SIGBUS;
+        return ret;
+}
+
+static struct vm_operations_struct gfs2_vm_ops = {
+        .fault = filemap_fault,
+        .page_mkwrite = gfs2_page_mkwrite,
+};
+
+/**
+ * gfs2_mmap -
+ * @file: The file to map
+ * @vma: The VMA which described the mapping
+ *
+ * There is no need to get a lock here unless we should be updating
+ * atime. We ignore any locking errors since the only consequence is
+ * a missed atime update (which will just be deferred until later).
+ *
+ * Returns: 0
+ */
+
+static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+
+        if (!(file->f_flags & O_NOATIME)) {
+                struct gfs2_holder i_gh;
+                int error;
+
+                gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+                error = gfs2_glock_nq(&i_gh);
+                file_accessed(file);
+                if (error == 0)
+                        gfs2_glock_dq_uninit(&i_gh);
+        }
+        vma->vm_ops = &gfs2_vm_ops;
+        vma->vm_flags |= VM_CAN_NONLINEAR;
+
+        return 0;
+}
+
+/**
+ * gfs2_open - open a file
+ * @inode: the inode to open
+ * @file: the struct file for this opening
+ *
+ * Returns: errno
+ */
+
+static int gfs2_open(struct inode *inode, struct file *file)
+{
+        struct gfs2_inode *ip = GFS2_I(inode);
+        struct gfs2_holder i_gh;
+        struct gfs2_file *fp;
+        int error;
+
+        fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
+        if (!fp)
+                return -ENOMEM;
+
+        mutex_init(&fp->f_fl_mutex);
+
+        gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
+        file->private_data = fp;
+
+        if (S_ISREG(ip->i_inode.i_mode)) {
+                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
+                                           &i_gh);
+                if (error)
+                        goto fail;
+
+                if (!(file->f_flags & O_LARGEFILE) &&
+                    ip->i_disksize > MAX_NON_LFS) {
+                        error = -EOVERFLOW;
+                        goto fail_gunlock;
+                }
+
+                gfs2_glock_dq_uninit(&i_gh);
+        }
+
+        return 0;
+
+fail_gunlock:
+        gfs2_glock_dq_uninit(&i_gh);
+fail:
+        file->private_data = NULL;
+        kfree(fp);
+        return error;
+}
+
+/**
+ * gfs2_close - called to close a struct file
+ * @inode: the inode the struct file belongs to
+ * @file: the struct file being closed
+ *
+ * Returns: errno
+ */
+
+static int gfs2_close(struct inode *inode, struct file *file)
+{
+        struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
+        struct gfs2_file *fp;
+
+        fp = file->private_data;
+        file->private_data = NULL;
+
+        if (gfs2_assert_warn(sdp, fp))
+                return -EIO;
+
+        kfree(fp);
+
+        return 0;
+}
+
+/**
+ * gfs2_fsync - sync the dirty data for a file (across the cluster)
+ * @file: the file that points to the dentry (we ignore this)
+ * @dentry: the dentry that points to the inode to sync
+ *
+ * The VFS will flush "normal" data for us. We only need to worry
+ * about metadata here. For journaled data, we just do a log flush
+ * as we can't avoid it. Otherwise we can just bale out if datasync
+ * is set. For stuffed inodes we must flush the log in order to
+ * ensure that all data is on disk.
+ *
+ * The call to write_inode_now() is there to write back metadata and
+ * the inode itself. It does also try and write the data, but thats
+ * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
+ * for us.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+        struct inode *inode = dentry->d_inode;
+        int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
+        int ret = 0;
+
+        if (gfs2_is_jdata(GFS2_I(inode))) {
+                gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
+                return 0;
+        }
+
+        if (sync_state != 0) {
+                if (!datasync)
+                        ret = write_inode_now(inode, 0);
+
+                if (gfs2_is_stuffed(GFS2_I(inode)))
+                        gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
+        }
+
+        return ret;
+}
+
+#ifdef CONFIG_GFS2_FS_LOCKING_DLM
+
+/**
+ * gfs2_setlease - acquire/release a file lease
+ * @file: the file pointer
+ * @arg: lease type
+ * @fl: file lock
+ *
+ * We don't currently have a way to enforce a lease across the whole
+ * cluster; until we do, disable leases (by just returning -EINVAL),
+ * unless the administrator has requested purely local locking.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
+{
+        return -EINVAL;
+}
+
+/**
+ * gfs2_lock - acquire/release a posix lock on a file
+ * @file: the file pointer
+ * @cmd: either modify or retrieve lock state, possibly wait
+ * @fl: type and range of lock
+ *
+ * Returns: errno
+ */
+
+static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
+{
+        struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+        struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
+        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
+
+        if (!(fl->fl_flags & FL_POSIX))
+                return -ENOLCK;
+        if (__mandatory_lock(&ip->i_inode))
+                return -ENOLCK;
+
+        if (cmd == F_CANCELLK) {
+                /* Hack: */
+                cmd = F_SETLK;
+                fl->fl_type = F_UNLCK;
+        }
+        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+                return -EIO;
+        if (IS_GETLK(cmd))
+                return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
+        else if (fl->fl_type == F_UNLCK)
+                return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
+        else
+                return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
+}
+
+static int do_flock(struct file *file, int cmd, struct file_lock *fl)
+{
+        struct gfs2_file *fp = file->private_data;
+        struct gfs2_holder *fl_gh = &fp->f_fl_gh;
+        struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
+        struct gfs2_glock *gl;
+        unsigned int state;
+        int flags;
+        int error = 0;
+
+        state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
+        flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
+
+        mutex_lock(&fp->f_fl_mutex);
+
+        gl = fl_gh->gh_gl;
+        if (gl) {
+                if (fl_gh->gh_state == state)
+                        goto out;
+                flock_lock_file_wait(file,
+                                     &(struct file_lock){.fl_type = F_UNLCK});
+                gfs2_glock_dq_wait(fl_gh);
+                gfs2_holder_reinit(state, flags, fl_gh);
+        } else {
+                error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
+                                       &gfs2_flock_glops, CREATE, &gl);
+                if (error)
+                        goto out;
+                gfs2_holder_init(gl, state, flags, fl_gh);
+                gfs2_glock_put(gl);
+        }
+        error = gfs2_glock_nq(fl_gh);
+        if (error) {
+                gfs2_holder_uninit(fl_gh);
+                if (error == GLR_TRYFAILED)
+                        error = -EAGAIN;
+        } else {
+                error = flock_lock_file_wait(file, fl);
+                gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
+        }
+
+out:
+        mutex_unlock(&fp->f_fl_mutex);
+        return error;
+}
+
+static void do_unflock(struct file *file, struct file_lock *fl)
+{
+        struct gfs2_file *fp = file->private_data;
+        struct gfs2_holder *fl_gh = &fp->f_fl_gh;
+
+        mutex_lock(&fp->f_fl_mutex);
+        flock_lock_file_wait(file, fl);
+        if (fl_gh->gh_gl)
+                gfs2_glock_dq_uninit(fl_gh);
+        mutex_unlock(&fp->f_fl_mutex);
+}
+
+/**
+ * gfs2_flock - acquire/release a flock lock on a file
+ * @file: the file pointer
+ * @cmd: either modify or retrieve lock state, possibly wait
+ * @fl: type and range of lock
+ *
+ * Returns: errno
+ */
+
+static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
+{
+        struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+
+        if (!(fl->fl_flags & FL_FLOCK))
+                return -ENOLCK;
+        if (__mandatory_lock(&ip->i_inode))
+                return -ENOLCK;
+
+        if (fl->fl_type == F_UNLCK) {
+                do_unflock(file, fl);
+                return 0;
+        } else {
+                return do_flock(file, cmd, fl);
+        }
+}
+
+const struct file_operations gfs2_file_fops = {
+        .llseek         = gfs2_llseek,
+        .read           = do_sync_read,
+        .aio_read       = generic_file_aio_read,
+        .write          = do_sync_write,
+        .aio_write      = generic_file_aio_write,
+        .unlocked_ioctl = gfs2_ioctl,
+        .mmap           = gfs2_mmap,
+        .open           = gfs2_open,
+        .release        = gfs2_close,
+        .fsync          = gfs2_fsync,
+        .lock           = gfs2_lock,
+        .flock          = gfs2_flock,
+        .splice_read    = generic_file_splice_read,
+        .splice_write   = generic_file_splice_write,
+        .setlease       = gfs2_setlease,
+};
+
+const struct file_operations gfs2_dir_fops = {
+        .readdir        = gfs2_readdir,
+        .unlocked_ioctl = gfs2_ioctl,
+        .open           = gfs2_open,
+        .release        = gfs2_close,
+        .fsync          = gfs2_fsync,
+        .lock           = gfs2_lock,
+        .flock          = gfs2_flock,
+};
+
+#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
+
+const struct file_operations gfs2_file_fops_nolock = {
+        .llseek         = gfs2_llseek,
+        .read           = do_sync_read,
+        .aio_read       = generic_file_aio_read,
+        .write          = do_sync_write,
+        .aio_write      = generic_file_aio_write,
+        .unlocked_ioctl = gfs2_ioctl,
+        .mmap           = gfs2_mmap,
+        .open           = gfs2_open,
+        .release        = gfs2_close,
+        .fsync          = gfs2_fsync,
+        .splice_read    = generic_file_splice_read,
+        .splice_write   = generic_file_splice_write,
+        .setlease       = generic_setlease,
+};
+
+const struct file_operations gfs2_dir_fops_nolock = {
+        .readdir        = gfs2_readdir,
+        .unlocked_ioctl = gfs2_ioctl,
+        .open           = gfs2_open,
+        .release        = gfs2_close,
+        .fsync          = gfs2_fsync,
+};
+