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![Steven Whitehouse](/assets/img/avatar_default.png)
This adds an extra argument to gfs2_trans_add_bh() to indicate whether the bh being added to the transaction is metadata or data. Its currently unused since all existing callers set it to 1 (metadata) but following patches will make use of it. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
1590 lines
36 KiB
C
1590 lines
36 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/uio.h>
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#include <linux/blkdev.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <linux/gfs2_ioctl.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "bmap.h"
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#include "dir.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "jdata.h"
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#include "lm.h"
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#include "log.h"
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#include "meta_io.h"
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#include "ops_file.h"
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#include "ops_vm.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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/* "bad" is for NFS support */
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struct filldir_bad_entry {
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char *fbe_name;
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unsigned int fbe_length;
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uint64_t fbe_offset;
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struct gfs2_inum fbe_inum;
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unsigned int fbe_type;
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};
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struct filldir_bad {
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struct gfs2_sbd *fdb_sbd;
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struct filldir_bad_entry *fdb_entry;
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unsigned int fdb_entry_num;
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unsigned int fdb_entry_off;
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char *fdb_name;
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unsigned int fdb_name_size;
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unsigned int fdb_name_off;
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};
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/* For regular, non-NFS */
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struct filldir_reg {
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struct gfs2_sbd *fdr_sbd;
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int fdr_prefetch;
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filldir_t fdr_filldir;
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void *fdr_opaque;
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};
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typedef ssize_t(*do_rw_t) (struct file *file,
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char __user *buf,
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size_t size, loff_t *offset,
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unsigned int num_gh, struct gfs2_holder *ghs);
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/**
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* gfs2_llseek - seek to a location in a file
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* @file: the file
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* @offset: the offset
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* @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
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*
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* SEEK_END requires the glock for the file because it references the
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* file's size.
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*
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* Returns: The new offset, or errno
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*/
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static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
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{
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struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
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struct gfs2_holder i_gh;
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loff_t error;
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atomic_inc(&ip->i_sbd->sd_ops_file);
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if (origin == 2) {
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
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&i_gh);
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if (!error) {
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error = remote_llseek(file, offset, origin);
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gfs2_glock_dq_uninit(&i_gh);
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}
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} else
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error = remote_llseek(file, offset, origin);
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return error;
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}
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static inline unsigned int vma2state(struct vm_area_struct *vma)
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{
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if ((vma->vm_flags & (VM_MAYWRITE | VM_MAYSHARE)) ==
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(VM_MAYWRITE | VM_MAYSHARE))
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return LM_ST_EXCLUSIVE;
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return LM_ST_SHARED;
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}
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static ssize_t walk_vm_hard(struct file *file, const char __user *buf, size_t size,
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loff_t *offset, do_rw_t operation)
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{
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struct gfs2_holder *ghs;
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unsigned int num_gh = 0;
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ssize_t count;
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struct super_block *sb = file->f_dentry->d_inode->i_sb;
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long start = (unsigned long)buf;
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unsigned long end = start + size;
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int dumping = (current->flags & PF_DUMPCORE);
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unsigned int x = 0;
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for (vma = find_vma(mm, start); vma; vma = vma->vm_next) {
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if (end <= vma->vm_start)
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break;
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if (vma->vm_file &&
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vma->vm_file->f_dentry->d_inode->i_sb == sb) {
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num_gh++;
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}
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}
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ghs = kcalloc((num_gh + 1), sizeof(struct gfs2_holder), GFP_KERNEL);
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if (!ghs) {
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if (!dumping)
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up_read(&mm->mmap_sem);
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return -ENOMEM;
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}
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for (vma = find_vma(mm, start); vma; vma = vma->vm_next) {
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if (end <= vma->vm_start)
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break;
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if (vma->vm_file) {
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struct inode *inode = vma->vm_file->f_dentry->d_inode;
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if (inode->i_sb == sb)
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gfs2_holder_init(get_v2ip(inode)->i_gl,
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vma2state(vma), 0, &ghs[x++]);
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}
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}
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if (!dumping)
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up_read(&mm->mmap_sem);
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gfs2_assert(get_v2sdp(sb), x == num_gh);
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count = operation(file, buf, size, offset, num_gh, ghs);
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while (num_gh--)
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gfs2_holder_uninit(&ghs[num_gh]);
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kfree(ghs);
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return count;
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}
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/**
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* walk_vm - Walk the vmas associated with a buffer for read or write.
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* If any of them are gfs2, pass the gfs2 inode down to the read/write
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* worker function so that locks can be acquired in the correct order.
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* @file: The file to read/write from/to
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* @buf: The buffer to copy to/from
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* @size: The amount of data requested
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* @offset: The current file offset
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* @operation: The read or write worker function
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*
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* Outputs: Offset - updated according to number of bytes written
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*
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* Returns: The number of bytes written, errno on failure
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*/
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static ssize_t walk_vm(struct file *file, const char __user *buf, size_t size,
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loff_t *offset, do_rw_t operation)
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{
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struct gfs2_holder gh;
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if (current->mm) {
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struct super_block *sb = file->f_dentry->d_inode->i_sb;
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long start = (unsigned long)buf;
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unsigned long end = start + size;
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int dumping = (current->flags & PF_DUMPCORE);
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if (!dumping)
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down_read(&mm->mmap_sem);
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for (vma = find_vma(mm, start); vma; vma = vma->vm_next) {
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if (end <= vma->vm_start)
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break;
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if (vma->vm_file &&
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vma->vm_file->f_dentry->d_inode->i_sb == sb)
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goto do_locks;
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}
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if (!dumping)
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up_read(&mm->mmap_sem);
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}
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return operation(file, buf, size, offset, 0, &gh);
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do_locks:
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return walk_vm_hard(file, buf, size, offset, operation);
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}
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static ssize_t do_jdata_read(struct file *file, char __user *buf, size_t size,
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loff_t *offset)
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{
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struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
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ssize_t count = 0;
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if (*offset < 0)
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return -EINVAL;
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if (!access_ok(VERIFY_WRITE, buf, size))
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return -EFAULT;
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if (!(file->f_flags & O_LARGEFILE)) {
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if (*offset >= MAX_NON_LFS)
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return -EFBIG;
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if (*offset + size > MAX_NON_LFS)
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size = MAX_NON_LFS - *offset;
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}
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count = gfs2_jdata_read(ip, buf, *offset, size, gfs2_copy2user);
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if (count > 0)
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*offset += count;
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return count;
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}
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/**
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* do_read_direct - Read bytes from a file
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* @file: The file to read from
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* @buf: The buffer to copy into
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* @size: The amount of data requested
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* @offset: The current file offset
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* @num_gh: The number of other locks we need to do the read
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* @ghs: the locks we need plus one for our lock
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*
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* Outputs: Offset - updated according to number of bytes read
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*
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* Returns: The number of bytes read, errno on failure
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*/
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static ssize_t do_read_direct(struct file *file, char __user *buf, size_t size,
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loff_t *offset, unsigned int num_gh,
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struct gfs2_holder *ghs)
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{
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struct inode *inode = file->f_mapping->host;
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struct gfs2_inode *ip = get_v2ip(inode);
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unsigned int state = LM_ST_DEFERRED;
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int flags = 0;
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unsigned int x;
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ssize_t count = 0;
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int error;
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for (x = 0; x < num_gh; x++)
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if (ghs[x].gh_gl == ip->i_gl) {
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state = LM_ST_SHARED;
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flags |= GL_LOCAL_EXCL;
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break;
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}
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gfs2_holder_init(ip->i_gl, state, flags, &ghs[num_gh]);
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error = gfs2_glock_nq_m(num_gh + 1, ghs);
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if (error)
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goto out;
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error = -EINVAL;
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if (gfs2_is_jdata(ip))
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goto out_gunlock;
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if (gfs2_is_stuffed(ip)) {
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size_t mask = bdev_hardsect_size(inode->i_sb->s_bdev) - 1;
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if (((*offset) & mask) || (((unsigned long)buf) & mask))
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goto out_gunlock;
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count = do_jdata_read(file, buf, size & ~mask, offset);
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} else
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count = generic_file_read(file, buf, size, offset);
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error = 0;
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out_gunlock:
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gfs2_glock_dq_m(num_gh + 1, ghs);
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out:
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gfs2_holder_uninit(&ghs[num_gh]);
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return (count) ? count : error;
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}
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/**
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* do_read_buf - Read bytes from a file
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* @file: The file to read from
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* @buf: The buffer to copy into
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* @size: The amount of data requested
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* @offset: The current file offset
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* @num_gh: The number of other locks we need to do the read
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* @ghs: the locks we need plus one for our lock
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*
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* Outputs: Offset - updated according to number of bytes read
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*
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* Returns: The number of bytes read, errno on failure
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*/
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static ssize_t do_read_buf(struct file *file, char __user *buf, size_t size,
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loff_t *offset, unsigned int num_gh,
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struct gfs2_holder *ghs)
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{
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struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
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ssize_t count = 0;
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int error;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &ghs[num_gh]);
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error = gfs2_glock_nq_m_atime(num_gh + 1, ghs);
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if (error)
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goto out;
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if (gfs2_is_jdata(ip))
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count = do_jdata_read(file, buf, size, offset);
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else
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count = generic_file_read(file, buf, size, offset);
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gfs2_glock_dq_m(num_gh + 1, ghs);
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out:
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gfs2_holder_uninit(&ghs[num_gh]);
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return (count) ? count : error;
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}
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/**
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* gfs2_read - Read bytes from a file
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* @file: The file to read from
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* @buf: The buffer to copy into
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* @size: The amount of data requested
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* @offset: The current file offset
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*
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* Outputs: Offset - updated according to number of bytes read
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*
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* Returns: The number of bytes read, errno on failure
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*/
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static ssize_t gfs2_read(struct file *file, char __user *buf, size_t size,
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loff_t *offset)
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{
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atomic_inc(&get_v2sdp(file->f_mapping->host->i_sb)->sd_ops_file);
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if (file->f_flags & O_DIRECT)
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return walk_vm(file, buf, size, offset, do_read_direct);
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else
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return walk_vm(file, buf, size, offset, do_read_buf);
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}
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/**
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* grope_mapping - feel up a mapping that needs to be written
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* @buf: the start of the memory to be written
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* @size: the size of the memory to be written
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*
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* We do this after acquiring the locks on the mapping,
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* but before starting the write transaction. We need to make
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* sure that we don't cause recursive transactions if blocks
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* need to be allocated to the file backing the mapping.
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*
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* Returns: errno
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*/
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static int grope_mapping(const char __user *buf, size_t size)
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{
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const char __user *stop = buf + size;
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char c;
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while (buf < stop) {
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if (copy_from_user(&c, buf, 1))
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return -EFAULT;
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buf += PAGE_CACHE_SIZE;
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buf = (const char __user *)PAGE_ALIGN((unsigned long)buf);
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}
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|
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return 0;
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}
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|
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/**
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* do_write_direct_alloc - Write bytes to a file
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* @file: The file to write to
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* @buf: The buffer to copy from
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* @size: The amount of data requested
|
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* @offset: The current file offset
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*
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* Outputs: Offset - updated according to number of bytes written
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*
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* Returns: The number of bytes written, errno on failure
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*/
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|
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static ssize_t do_write_direct_alloc(struct file *file, const char __user *buf, size_t size,
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loff_t *offset)
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{
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struct inode *inode = file->f_mapping->host;
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struct gfs2_inode *ip = get_v2ip(inode);
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struct gfs2_sbd *sdp = ip->i_sbd;
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struct gfs2_alloc *al = NULL;
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struct iovec local_iov = { .iov_base = buf, .iov_len = size };
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struct buffer_head *dibh;
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unsigned int data_blocks, ind_blocks;
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ssize_t count;
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int error;
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|
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gfs2_write_calc_reserv(ip, size, &data_blocks, &ind_blocks);
|
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|
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al = gfs2_alloc_get(ip);
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|
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error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
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if (error)
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goto fail;
|
|
|
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error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
|
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if (error)
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goto fail_gunlock_q;
|
|
|
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al->al_requested = data_blocks + ind_blocks;
|
|
|
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error = gfs2_inplace_reserve(ip);
|
|
if (error)
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goto fail_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp,
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al->al_rgd->rd_ri.ri_length + ind_blocks +
|
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RES_DINODE + RES_STATFS + RES_QUOTA, 0);
|
|
if (error)
|
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goto fail_ipres;
|
|
|
|
if ((ip->i_di.di_mode & (S_ISUID | S_ISGID)) && !capable(CAP_FSETID)) {
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error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
|
|
ip->i_di.di_mode &= (ip->i_di.di_mode & S_IXGRP) ?
|
|
(~(S_ISUID | S_ISGID)) : (~S_ISUID);
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
}
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_sync, NULL);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
}
|
|
|
|
count = generic_file_write_nolock(file, &local_iov, 1, offset);
|
|
if (count < 0) {
|
|
error = count;
|
|
goto fail_end_trans;
|
|
}
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
|
|
if (ip->i_di.di_size < inode->i_size)
|
|
ip->i_di.di_size = inode->i_size;
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
if (file->f_flags & O_SYNC)
|
|
gfs2_log_flush_glock(ip->i_gl);
|
|
|
|
gfs2_inplace_release(ip);
|
|
gfs2_quota_unlock(ip);
|
|
gfs2_alloc_put(ip);
|
|
|
|
if (file->f_mapping->nrpages) {
|
|
error = filemap_fdatawrite(file->f_mapping);
|
|
if (!error)
|
|
error = filemap_fdatawait(file->f_mapping);
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
return count;
|
|
|
|
fail_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
|
|
fail_ipres:
|
|
gfs2_inplace_release(ip);
|
|
|
|
fail_gunlock_q:
|
|
gfs2_quota_unlock(ip);
|
|
|
|
fail:
|
|
gfs2_alloc_put(ip);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* do_write_direct - Write bytes to a file
|
|
* @file: The file to write to
|
|
* @buf: The buffer to copy from
|
|
* @size: The amount of data requested
|
|
* @offset: The current file offset
|
|
* @num_gh: The number of other locks we need to do the read
|
|
* @gh: the locks we need plus one for our lock
|
|
*
|
|
* Outputs: Offset - updated according to number of bytes written
|
|
*
|
|
* Returns: The number of bytes written, errno on failure
|
|
*/
|
|
|
|
static ssize_t do_write_direct(struct file *file, const char __user *buf, size_t size,
|
|
loff_t *offset, unsigned int num_gh,
|
|
struct gfs2_holder *ghs)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct gfs2_file *fp = get_v2fp(file);
|
|
unsigned int state = LM_ST_DEFERRED;
|
|
int alloc_required;
|
|
unsigned int x;
|
|
size_t s;
|
|
ssize_t count = 0;
|
|
int error;
|
|
|
|
if (test_bit(GFF_DID_DIRECT_ALLOC, &fp->f_flags))
|
|
state = LM_ST_EXCLUSIVE;
|
|
else
|
|
for (x = 0; x < num_gh; x++)
|
|
if (ghs[x].gh_gl == ip->i_gl) {
|
|
state = LM_ST_EXCLUSIVE;
|
|
break;
|
|
}
|
|
|
|
restart:
|
|
gfs2_holder_init(ip->i_gl, state, 0, &ghs[num_gh]);
|
|
|
|
error = gfs2_glock_nq_m(num_gh + 1, ghs);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = -EINVAL;
|
|
if (gfs2_is_jdata(ip))
|
|
goto out_gunlock;
|
|
|
|
if (num_gh) {
|
|
error = grope_mapping(buf, size);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
|
|
if (file->f_flags & O_APPEND)
|
|
*offset = ip->i_di.di_size;
|
|
|
|
if (!(file->f_flags & O_LARGEFILE)) {
|
|
error = -EFBIG;
|
|
if (*offset >= MAX_NON_LFS)
|
|
goto out_gunlock;
|
|
if (*offset + size > MAX_NON_LFS)
|
|
size = MAX_NON_LFS - *offset;
|
|
}
|
|
|
|
if (gfs2_is_stuffed(ip) ||
|
|
*offset + size > ip->i_di.di_size ||
|
|
((ip->i_di.di_mode & (S_ISUID | S_ISGID)) && !capable(CAP_FSETID)))
|
|
alloc_required = 1;
|
|
else {
|
|
error = gfs2_write_alloc_required(ip, *offset, size,
|
|
&alloc_required);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
|
|
if (alloc_required && state != LM_ST_EXCLUSIVE) {
|
|
gfs2_glock_dq_m(num_gh + 1, ghs);
|
|
gfs2_holder_uninit(&ghs[num_gh]);
|
|
state = LM_ST_EXCLUSIVE;
|
|
goto restart;
|
|
}
|
|
|
|
if (alloc_required) {
|
|
set_bit(GFF_DID_DIRECT_ALLOC, &fp->f_flags);
|
|
|
|
/* split large writes into smaller atomic transactions */
|
|
while (size) {
|
|
s = gfs2_tune_get(sdp, gt_max_atomic_write);
|
|
if (s > size)
|
|
s = size;
|
|
|
|
error = do_write_direct_alloc(file, buf, s, offset);
|
|
if (error < 0)
|
|
goto out_gunlock;
|
|
|
|
buf += error;
|
|
size -= error;
|
|
count += error;
|
|
}
|
|
} else {
|
|
struct iovec local_iov = { .iov_base = buf, .iov_len = size };
|
|
struct gfs2_holder t_gh;
|
|
|
|
clear_bit(GFF_DID_DIRECT_ALLOC, &fp->f_flags);
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
|
|
GL_NEVER_RECURSE, &t_gh);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
count = generic_file_write_nolock(file, &local_iov, 1, offset);
|
|
|
|
gfs2_glock_dq_uninit(&t_gh);
|
|
}
|
|
|
|
error = 0;
|
|
|
|
out_gunlock:
|
|
gfs2_glock_dq_m(num_gh + 1, ghs);
|
|
|
|
out:
|
|
gfs2_holder_uninit(&ghs[num_gh]);
|
|
|
|
return (count) ? count : error;
|
|
}
|
|
|
|
/**
|
|
* do_do_write_buf - Write bytes to a file
|
|
* @file: The file to write to
|
|
* @buf: The buffer to copy from
|
|
* @size: The amount of data requested
|
|
* @offset: The current file offset
|
|
*
|
|
* Outputs: Offset - updated according to number of bytes written
|
|
*
|
|
* Returns: The number of bytes written, errno on failure
|
|
*/
|
|
|
|
static ssize_t do_do_write_buf(struct file *file, const char __user *buf, size_t size,
|
|
loff_t *offset)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct gfs2_inode *ip = get_v2ip(inode);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct gfs2_alloc *al = NULL;
|
|
struct buffer_head *dibh;
|
|
unsigned int data_blocks, ind_blocks;
|
|
int alloc_required, journaled;
|
|
ssize_t count;
|
|
int error;
|
|
|
|
journaled = gfs2_is_jdata(ip);
|
|
|
|
gfs2_write_calc_reserv(ip, size, &data_blocks, &ind_blocks);
|
|
|
|
error = gfs2_write_alloc_required(ip, *offset, size, &alloc_required);
|
|
if (error)
|
|
return error;
|
|
|
|
if (alloc_required) {
|
|
al = gfs2_alloc_get(ip);
|
|
|
|
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
|
|
if (error)
|
|
goto fail_gunlock_q;
|
|
|
|
al->al_requested = data_blocks + ind_blocks;
|
|
|
|
error = gfs2_inplace_reserve(ip);
|
|
if (error)
|
|
goto fail_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp,
|
|
al->al_rgd->rd_ri.ri_length +
|
|
ind_blocks +
|
|
((journaled) ? data_blocks : 0) +
|
|
RES_DINODE + RES_STATFS + RES_QUOTA,
|
|
0);
|
|
if (error)
|
|
goto fail_ipres;
|
|
} else {
|
|
error = gfs2_trans_begin(sdp,
|
|
((journaled) ? data_blocks : 0) +
|
|
RES_DINODE,
|
|
0);
|
|
if (error)
|
|
goto fail_ipres;
|
|
}
|
|
|
|
if ((ip->i_di.di_mode & (S_ISUID | S_ISGID)) && !capable(CAP_FSETID)) {
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
|
|
ip->i_di.di_mode &= (ip->i_di.di_mode & S_IXGRP) ?
|
|
(~(S_ISUID | S_ISGID)) : (~S_ISUID);
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
}
|
|
|
|
if (journaled) {
|
|
count = gfs2_jdata_write(ip, buf, *offset, size,
|
|
gfs2_copy_from_user);
|
|
if (count < 0) {
|
|
error = count;
|
|
goto fail_end_trans;
|
|
}
|
|
|
|
*offset += count;
|
|
} else {
|
|
struct iovec local_iov = { .iov_base = buf, .iov_len = size };
|
|
|
|
count = generic_file_write_nolock(file, &local_iov, 1, offset);
|
|
if (count < 0) {
|
|
error = count;
|
|
goto fail_end_trans;
|
|
}
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
|
|
if (ip->i_di.di_size < inode->i_size)
|
|
ip->i_di.di_size = inode->i_size;
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
}
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
if (file->f_flags & O_SYNC || IS_SYNC(inode)) {
|
|
gfs2_log_flush_glock(ip->i_gl);
|
|
error = filemap_fdatawrite(file->f_mapping);
|
|
if (error == 0)
|
|
error = filemap_fdatawait(file->f_mapping);
|
|
if (error)
|
|
goto fail_ipres;
|
|
}
|
|
|
|
if (alloc_required) {
|
|
gfs2_assert_warn(sdp, count != size ||
|
|
al->al_alloced);
|
|
gfs2_inplace_release(ip);
|
|
gfs2_quota_unlock(ip);
|
|
gfs2_alloc_put(ip);
|
|
}
|
|
|
|
return count;
|
|
|
|
fail_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
|
|
fail_ipres:
|
|
if (alloc_required)
|
|
gfs2_inplace_release(ip);
|
|
|
|
fail_gunlock_q:
|
|
if (alloc_required)
|
|
gfs2_quota_unlock(ip);
|
|
|
|
fail:
|
|
if (alloc_required)
|
|
gfs2_alloc_put(ip);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* do_write_buf - Write bytes to a file
|
|
* @file: The file to write to
|
|
* @buf: The buffer to copy from
|
|
* @size: The amount of data requested
|
|
* @offset: The current file offset
|
|
* @num_gh: The number of other locks we need to do the read
|
|
* @gh: the locks we need plus one for our lock
|
|
*
|
|
* Outputs: Offset - updated according to number of bytes written
|
|
*
|
|
* Returns: The number of bytes written, errno on failure
|
|
*/
|
|
|
|
static ssize_t do_write_buf(struct file *file, const char __user *buf, size_t size,
|
|
loff_t *offset, unsigned int num_gh,
|
|
struct gfs2_holder *ghs)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
size_t s;
|
|
ssize_t count = 0;
|
|
int error;
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ghs[num_gh]);
|
|
|
|
error = gfs2_glock_nq_m(num_gh + 1, ghs);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (num_gh) {
|
|
error = grope_mapping(buf, size);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
|
|
if (file->f_flags & O_APPEND)
|
|
*offset = ip->i_di.di_size;
|
|
|
|
if (!(file->f_flags & O_LARGEFILE)) {
|
|
error = -EFBIG;
|
|
if (*offset >= MAX_NON_LFS)
|
|
goto out_gunlock;
|
|
if (*offset + size > MAX_NON_LFS)
|
|
size = MAX_NON_LFS - *offset;
|
|
}
|
|
|
|
/* split large writes into smaller atomic transactions */
|
|
while (size) {
|
|
s = gfs2_tune_get(sdp, gt_max_atomic_write);
|
|
if (s > size)
|
|
s = size;
|
|
|
|
error = do_do_write_buf(file, buf, s, offset);
|
|
if (error < 0)
|
|
goto out_gunlock;
|
|
|
|
buf += error;
|
|
size -= error;
|
|
count += error;
|
|
}
|
|
|
|
error = 0;
|
|
|
|
out_gunlock:
|
|
gfs2_glock_dq_m(num_gh + 1, ghs);
|
|
|
|
out:
|
|
gfs2_holder_uninit(&ghs[num_gh]);
|
|
|
|
return (count) ? count : error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_write - Write bytes to a file
|
|
* @file: The file to write to
|
|
* @buf: The buffer to copy from
|
|
* @size: The amount of data requested
|
|
* @offset: The current file offset
|
|
*
|
|
* Outputs: Offset - updated according to number of bytes written
|
|
*
|
|
* Returns: The number of bytes written, errno on failure
|
|
*/
|
|
|
|
static ssize_t gfs2_write(struct file *file, const char __user *buf,
|
|
size_t size, loff_t *offset)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
ssize_t count;
|
|
|
|
atomic_inc(&get_v2sdp(inode->i_sb)->sd_ops_file);
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (!access_ok(VERIFY_READ, buf, size))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (file->f_flags & O_DIRECT)
|
|
count = walk_vm(file, buf, size, offset,
|
|
do_write_direct);
|
|
else
|
|
count = walk_vm(file, buf, size, offset, do_write_buf);
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* filldir_reg_func - Report a directory entry to the caller of gfs2_dir_read()
|
|
* @opaque: opaque data used by the function
|
|
* @name: the name of the directory entry
|
|
* @length: the length of the name
|
|
* @offset: the entry's offset in the directory
|
|
* @inum: the inode number the entry points to
|
|
* @type: the type of inode the entry points to
|
|
*
|
|
* Returns: 0 on success, 1 if buffer full
|
|
*/
|
|
|
|
static int filldir_reg_func(void *opaque, const char *name, unsigned int length,
|
|
uint64_t offset, struct gfs2_inum *inum,
|
|
unsigned int type)
|
|
{
|
|
struct filldir_reg *fdr = (struct filldir_reg *)opaque;
|
|
struct gfs2_sbd *sdp = fdr->fdr_sbd;
|
|
int error;
|
|
|
|
error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset,
|
|
inum->no_formal_ino, type);
|
|
if (error)
|
|
return 1;
|
|
|
|
if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) {
|
|
gfs2_glock_prefetch_num(sdp,
|
|
inum->no_addr, &gfs2_inode_glops,
|
|
LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
|
|
gfs2_glock_prefetch_num(sdp,
|
|
inum->no_addr, &gfs2_iopen_glops,
|
|
LM_ST_SHARED, LM_FLAG_TRY);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* readdir_reg - 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 readdir_reg(struct file *file, void *dirent, filldir_t filldir)
|
|
{
|
|
struct gfs2_inode *dip = get_v2ip(file->f_mapping->host);
|
|
struct filldir_reg fdr;
|
|
struct gfs2_holder d_gh;
|
|
uint64_t offset = file->f_pos;
|
|
int error;
|
|
|
|
fdr.fdr_sbd = dip->i_sbd;
|
|
fdr.fdr_prefetch = 1;
|
|
fdr.fdr_filldir = filldir;
|
|
fdr.fdr_opaque = dirent;
|
|
|
|
gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
|
|
error = gfs2_glock_nq_atime(&d_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(&d_gh);
|
|
return error;
|
|
}
|
|
|
|
error = gfs2_dir_read(dip, &offset, &fdr, filldir_reg_func);
|
|
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
|
|
file->f_pos = offset;
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* filldir_bad_func - Report a directory entry to the caller of gfs2_dir_read()
|
|
* @opaque: opaque data used by the function
|
|
* @name: the name of the directory entry
|
|
* @length: the length of the name
|
|
* @offset: the entry's offset in the directory
|
|
* @inum: the inode number the entry points to
|
|
* @type: the type of inode the entry points to
|
|
*
|
|
* For supporting NFS.
|
|
*
|
|
* Returns: 0 on success, 1 if buffer full
|
|
*/
|
|
|
|
static int filldir_bad_func(void *opaque, const char *name, unsigned int length,
|
|
uint64_t offset, struct gfs2_inum *inum,
|
|
unsigned int type)
|
|
{
|
|
struct filldir_bad *fdb = (struct filldir_bad *)opaque;
|
|
struct gfs2_sbd *sdp = fdb->fdb_sbd;
|
|
struct filldir_bad_entry *fbe;
|
|
|
|
if (fdb->fdb_entry_off == fdb->fdb_entry_num ||
|
|
fdb->fdb_name_off + length > fdb->fdb_name_size)
|
|
return 1;
|
|
|
|
fbe = &fdb->fdb_entry[fdb->fdb_entry_off];
|
|
fbe->fbe_name = fdb->fdb_name + fdb->fdb_name_off;
|
|
memcpy(fbe->fbe_name, name, length);
|
|
fbe->fbe_length = length;
|
|
fbe->fbe_offset = offset;
|
|
fbe->fbe_inum = *inum;
|
|
fbe->fbe_type = type;
|
|
|
|
fdb->fdb_entry_off++;
|
|
fdb->fdb_name_off += length;
|
|
|
|
if (!(length == 1 && *name == '.')) {
|
|
gfs2_glock_prefetch_num(sdp,
|
|
inum->no_addr, &gfs2_inode_glops,
|
|
LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
|
|
gfs2_glock_prefetch_num(sdp,
|
|
inum->no_addr, &gfs2_iopen_glops,
|
|
LM_ST_SHARED, LM_FLAG_TRY);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* readdir_bad - Read directory entries from a directory
|
|
* @file: The directory to read from
|
|
* @dirent: Buffer for dirents
|
|
* @filldir: Function used to do the copying
|
|
*
|
|
* For supporting NFS.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int readdir_bad(struct file *file, void *dirent, filldir_t filldir)
|
|
{
|
|
struct gfs2_inode *dip = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = dip->i_sbd;
|
|
struct filldir_reg fdr;
|
|
unsigned int entries, size;
|
|
struct filldir_bad *fdb;
|
|
struct gfs2_holder d_gh;
|
|
uint64_t offset = file->f_pos;
|
|
unsigned int x;
|
|
struct filldir_bad_entry *fbe;
|
|
int error;
|
|
|
|
entries = gfs2_tune_get(sdp, gt_entries_per_readdir);
|
|
size = sizeof(struct filldir_bad) +
|
|
entries * (sizeof(struct filldir_bad_entry) + GFS2_FAST_NAME_SIZE);
|
|
|
|
fdb = kzalloc(size, GFP_KERNEL);
|
|
if (!fdb)
|
|
return -ENOMEM;
|
|
|
|
fdb->fdb_sbd = sdp;
|
|
fdb->fdb_entry = (struct filldir_bad_entry *)(fdb + 1);
|
|
fdb->fdb_entry_num = entries;
|
|
fdb->fdb_name = ((char *)fdb) + sizeof(struct filldir_bad) +
|
|
entries * sizeof(struct filldir_bad_entry);
|
|
fdb->fdb_name_size = entries * GFS2_FAST_NAME_SIZE;
|
|
|
|
gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
|
|
error = gfs2_glock_nq_atime(&d_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(&d_gh);
|
|
goto out;
|
|
}
|
|
|
|
error = gfs2_dir_read(dip, &offset, fdb, filldir_bad_func);
|
|
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
|
|
fdr.fdr_sbd = sdp;
|
|
fdr.fdr_prefetch = 0;
|
|
fdr.fdr_filldir = filldir;
|
|
fdr.fdr_opaque = dirent;
|
|
|
|
for (x = 0; x < fdb->fdb_entry_off; x++) {
|
|
fbe = &fdb->fdb_entry[x];
|
|
|
|
error = filldir_reg_func(&fdr,
|
|
fbe->fbe_name, fbe->fbe_length,
|
|
fbe->fbe_offset,
|
|
&fbe->fbe_inum, fbe->fbe_type);
|
|
if (error) {
|
|
file->f_pos = fbe->fbe_offset;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
file->f_pos = offset;
|
|
|
|
out:
|
|
kfree(fdb);
|
|
|
|
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)
|
|
{
|
|
int error;
|
|
|
|
atomic_inc(&get_v2sdp(file->f_mapping->host->i_sb)->sd_ops_file);
|
|
|
|
if (strcmp(current->comm, "nfsd") != 0)
|
|
error = readdir_reg(file, dirent, filldir);
|
|
else
|
|
error = readdir_bad(file, dirent, filldir);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int gfs2_ioctl_flags(struct gfs2_inode *ip, unsigned int cmd, unsigned long arg)
|
|
{
|
|
unsigned int lmode = (cmd == GFS2_IOCTL_SETFLAGS) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
|
|
struct buffer_head *dibh;
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
__u32 flags = 0, change;
|
|
|
|
if (cmd == GFS2_IOCTL_SETFLAGS) {
|
|
error = get_user(flags, (__u32 __user *)arg);
|
|
if (error)
|
|
return -EFAULT;
|
|
}
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, lmode, 0, &i_gh);
|
|
if (error)
|
|
return error;
|
|
|
|
if (cmd == GFS2_IOCTL_SETFLAGS) {
|
|
change = flags ^ ip->i_di.di_flags;
|
|
error = -EPERM;
|
|
if (change & (GFS2_DIF_IMMUTABLE|GFS2_DIF_APPENDONLY)) {
|
|
if (!capable(CAP_LINUX_IMMUTABLE))
|
|
goto out;
|
|
}
|
|
error = -EINVAL;
|
|
if (flags & (GFS2_DIF_JDATA|GFS2_DIF_DIRECTIO)) {
|
|
if (!S_ISREG(ip->i_di.di_mode))
|
|
goto out;
|
|
/* FIXME: Would be nice not to require the following test */
|
|
if ((flags & GFS2_DIF_JDATA) && ip->i_di.di_size)
|
|
goto out;
|
|
}
|
|
if (flags & (GFS2_DIF_INHERIT_JDATA|GFS2_DIF_INHERIT_DIRECTIO)) {
|
|
if (!S_ISDIR(ip->i_di.di_mode))
|
|
goto out;
|
|
}
|
|
|
|
error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out_trans_end;
|
|
|
|
ip->i_di.di_flags = flags;
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
|
|
brelse(dibh);
|
|
|
|
out_trans_end:
|
|
gfs2_trans_end(ip->i_sbd);
|
|
} else {
|
|
flags = ip->i_di.di_flags;
|
|
}
|
|
out:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
if (cmd == GFS2_IOCTL_GETFLAGS) {
|
|
if (put_user(flags, (__u32 __user *)arg))
|
|
return -EFAULT;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_ioctl - do an ioctl on a file
|
|
* @inode: the inode
|
|
* @file: the file pointer
|
|
* @cmd: the ioctl command
|
|
* @arg: the argument
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(inode);
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
|
|
switch (cmd) {
|
|
case GFS2_IOCTL_SETFLAGS:
|
|
case GFS2_IOCTL_GETFLAGS:
|
|
return gfs2_ioctl_flags(ip, cmd, arg);
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_mmap -
|
|
* @file: The file to map
|
|
* @vma: The VMA which described the mapping
|
|
*
|
|
* Returns: 0 or error code
|
|
*/
|
|
|
|
static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
|
|
error = gfs2_glock_nq_atime(&i_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(&i_gh);
|
|
return error;
|
|
}
|
|
|
|
if (gfs2_is_jdata(ip)) {
|
|
if (vma->vm_flags & VM_MAYSHARE)
|
|
error = -EOPNOTSUPP;
|
|
else
|
|
vma->vm_ops = &gfs2_vm_ops_private;
|
|
} else {
|
|
/* This is VM_MAYWRITE instead of VM_WRITE because a call
|
|
to mprotect() can turn on VM_WRITE later. */
|
|
|
|
if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
|
|
(VM_MAYSHARE | VM_MAYWRITE))
|
|
vma->vm_ops = &gfs2_vm_ops_sharewrite;
|
|
else
|
|
vma->vm_ops = &gfs2_vm_ops_private;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* 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 = get_v2ip(inode);
|
|
struct gfs2_holder i_gh;
|
|
struct gfs2_file *fp;
|
|
int error;
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
|
|
fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
|
|
if (!fp)
|
|
return -ENOMEM;
|
|
|
|
init_MUTEX(&fp->f_fl_mutex);
|
|
|
|
fp->f_inode = ip;
|
|
fp->f_vfile = file;
|
|
|
|
gfs2_assert_warn(ip->i_sbd, !get_v2fp(file));
|
|
set_v2fp(file, fp);
|
|
|
|
if (S_ISREG(ip->i_di.di_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_di.di_size > MAX_NON_LFS) {
|
|
error = -EFBIG;
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
/* Listen to the Direct I/O flag */
|
|
|
|
if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
|
|
file->f_flags |= O_DIRECT;
|
|
|
|
/* Don't let the user open O_DIRECT on a jdata file */
|
|
|
|
if ((file->f_flags & O_DIRECT) && gfs2_is_jdata(ip)) {
|
|
error = -EINVAL;
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_gunlock:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
fail:
|
|
set_v2fp(file, 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 = get_v2sdp(inode->i_sb);
|
|
struct gfs2_file *fp;
|
|
|
|
atomic_inc(&sdp->sd_ops_file);
|
|
|
|
fp = get_v2fp(file);
|
|
set_v2fp(file, 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
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
gfs2_log_flush_glock(ip->i_gl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct lm_lockname name =
|
|
{ .ln_number = ip->i_num.no_addr,
|
|
.ln_type = LM_TYPE_PLOCK };
|
|
|
|
atomic_inc(&sdp->sd_ops_file);
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks) {
|
|
if (IS_GETLK(cmd)) {
|
|
struct file_lock *tmp;
|
|
lock_kernel();
|
|
tmp = posix_test_lock(file, fl);
|
|
fl->fl_type = F_UNLCK;
|
|
if (tmp)
|
|
memcpy(fl, tmp, sizeof(struct file_lock));
|
|
unlock_kernel();
|
|
return 0;
|
|
} else {
|
|
int error;
|
|
lock_kernel();
|
|
error = posix_lock_file_wait(file, fl);
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
}
|
|
|
|
if (IS_GETLK(cmd))
|
|
return gfs2_lm_plock_get(sdp, &name, file, fl);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
return gfs2_lm_punlock(sdp, &name, file, fl);
|
|
else
|
|
return gfs2_lm_plock(sdp, &name, file, cmd, fl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_sendfile - Send bytes to a file or socket
|
|
* @in_file: The file to read from
|
|
* @out_file: The file to write to
|
|
* @count: The amount of data
|
|
* @offset: The beginning file offset
|
|
*
|
|
* Outputs: offset - updated according to number of bytes read
|
|
*
|
|
* Returns: The number of bytes sent, errno on failure
|
|
*/
|
|
|
|
static ssize_t gfs2_sendfile(struct file *in_file, loff_t *offset, size_t count,
|
|
read_actor_t actor, void *target)
|
|
{
|
|
struct gfs2_inode *ip = get_v2ip(in_file->f_mapping->host);
|
|
struct gfs2_holder gh;
|
|
ssize_t retval;
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
|
|
|
|
retval = gfs2_glock_nq_atime(&gh);
|
|
if (retval)
|
|
goto out;
|
|
|
|
if (gfs2_is_jdata(ip))
|
|
retval = -EOPNOTSUPP;
|
|
else
|
|
retval = generic_file_sendfile(in_file, offset, count, actor,
|
|
target);
|
|
|
|
gfs2_glock_dq(&gh);
|
|
|
|
out:
|
|
gfs2_holder_uninit(&gh);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = get_v2fp(file);
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
struct gfs2_inode *ip = fp->f_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;
|
|
|
|
down(&fp->f_fl_mutex);
|
|
|
|
gl = fl_gh->gh_gl;
|
|
if (gl) {
|
|
if (fl_gh->gh_state == state)
|
|
goto out;
|
|
gfs2_glock_hold(gl);
|
|
flock_lock_file_wait(file,
|
|
&(struct file_lock){.fl_type = F_UNLCK});
|
|
gfs2_glock_dq_uninit(fl_gh);
|
|
} else {
|
|
error = gfs2_glock_get(ip->i_sbd,
|
|
ip->i_num.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(ip->i_sbd, !error);
|
|
}
|
|
|
|
out:
|
|
up(&fp->f_fl_mutex);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void do_unflock(struct file *file, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = get_v2fp(file);
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
|
|
down(&fp->f_fl_mutex);
|
|
flock_lock_file_wait(file, fl);
|
|
if (fl_gh->gh_gl)
|
|
gfs2_glock_dq_uninit(fl_gh);
|
|
up(&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 = get_v2ip(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
|
|
atomic_inc(&ip->i_sbd->sd_ops_file);
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks)
|
|
return flock_lock_file_wait(file, fl);
|
|
|
|
if (fl->fl_type == F_UNLCK) {
|
|
do_unflock(file, fl);
|
|
return 0;
|
|
} else
|
|
return do_flock(file, cmd, fl);
|
|
}
|
|
|
|
struct file_operations gfs2_file_fops = {
|
|
.llseek = gfs2_llseek,
|
|
.read = gfs2_read,
|
|
.write = gfs2_write,
|
|
.ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.sendfile = gfs2_sendfile,
|
|
.flock = gfs2_flock,
|
|
};
|
|
|
|
struct file_operations gfs2_dir_fops = {
|
|
.readdir = gfs2_readdir,
|
|
.ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
};
|
|
|