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dd538c832a
A spelling mistake (one of mine). Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
812 lines
19 KiB
C
812 lines
19 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 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 version 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/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/ext2_fs.h>
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#include <linux/crc32.h>
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#include <linux/iflags.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "lm_interface.h"
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#include "incore.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 "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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#include "util.h"
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#include "eaops.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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u64 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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/*
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* Most fields left uninitialised to catch anybody who tries to
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* use them. f_flags set to prevent file_accessed() from touching
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* any other part of this. Its use is purely as a flag so that we
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* know (in readpage()) whether or not do to locking.
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*/
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struct file gfs2_internal_file_sentinel = {
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.f_flags = O_NOATIME|O_RDONLY,
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};
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static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
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unsigned long offset, unsigned long size)
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{
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char *kaddr;
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unsigned long count = desc->count;
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if (size > count)
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size = count;
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kaddr = kmap(page);
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memcpy(desc->arg.buf, kaddr + offset, size);
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kunmap(page);
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desc->count = count - size;
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desc->written += size;
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desc->arg.buf += size;
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return size;
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}
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int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
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char *buf, loff_t *pos, unsigned size)
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{
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struct inode *inode = &ip->i_inode;
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read_descriptor_t desc;
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desc.written = 0;
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desc.arg.buf = buf;
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desc.count = size;
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desc.error = 0;
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do_generic_mapping_read(inode->i_mapping, ra_state,
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&gfs2_internal_file_sentinel, pos, &desc,
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gfs2_read_actor);
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return desc.written ? desc.written : desc.error;
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}
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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 = GFS2_I(file->f_mapping->host);
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struct gfs2_holder i_gh;
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loff_t error;
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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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/**
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* filldir_reg_func - Report a directory entry to the caller of gfs2_dir_read()
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* @opaque: opaque data used by the function
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* @name: the name of the directory entry
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* @length: the length of the name
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* @offset: the entry's offset in the directory
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* @inum: the inode number the entry points to
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* @type: the type of inode the entry points to
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*
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* Returns: 0 on success, 1 if buffer full
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*/
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static int filldir_reg_func(void *opaque, const char *name, unsigned int length,
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u64 offset, struct gfs2_inum *inum,
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unsigned int type)
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{
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struct filldir_reg *fdr = (struct filldir_reg *)opaque;
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struct gfs2_sbd *sdp = fdr->fdr_sbd;
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int error;
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error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset,
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inum->no_addr, type);
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if (error)
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return 1;
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if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) {
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gfs2_glock_prefetch_num(sdp,
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inum->no_addr, &gfs2_inode_glops,
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LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
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gfs2_glock_prefetch_num(sdp,
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inum->no_addr, &gfs2_iopen_glops,
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LM_ST_SHARED, LM_FLAG_TRY);
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}
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return 0;
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}
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/**
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* readdir_reg - Read directory entries from a directory
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* @file: The directory to read from
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* @dirent: Buffer for dirents
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* @filldir: Function used to do the copying
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*
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* Returns: errno
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*/
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static int readdir_reg(struct file *file, void *dirent, filldir_t filldir)
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{
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struct inode *dir = file->f_mapping->host;
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struct gfs2_inode *dip = GFS2_I(dir);
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struct filldir_reg fdr;
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struct gfs2_holder d_gh;
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u64 offset = file->f_pos;
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int error;
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fdr.fdr_sbd = GFS2_SB(dir);
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fdr.fdr_prefetch = 1;
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fdr.fdr_filldir = filldir;
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fdr.fdr_opaque = dirent;
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gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
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error = gfs2_glock_nq_atime(&d_gh);
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if (error) {
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gfs2_holder_uninit(&d_gh);
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return error;
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}
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error = gfs2_dir_read(dir, &offset, &fdr, filldir_reg_func);
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gfs2_glock_dq_uninit(&d_gh);
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file->f_pos = offset;
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return error;
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}
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/**
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* filldir_bad_func - Report a directory entry to the caller of gfs2_dir_read()
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* @opaque: opaque data used by the function
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* @name: the name of the directory entry
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* @length: the length of the name
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* @offset: the entry's offset in the directory
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* @inum: the inode number the entry points to
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* @type: the type of inode the entry points to
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*
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* For supporting NFS.
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*
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* Returns: 0 on success, 1 if buffer full
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*/
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static int filldir_bad_func(void *opaque, const char *name, unsigned int length,
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u64 offset, struct gfs2_inum *inum,
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unsigned int type)
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{
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struct filldir_bad *fdb = (struct filldir_bad *)opaque;
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struct gfs2_sbd *sdp = fdb->fdb_sbd;
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struct filldir_bad_entry *fbe;
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if (fdb->fdb_entry_off == fdb->fdb_entry_num ||
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fdb->fdb_name_off + length > fdb->fdb_name_size)
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return 1;
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fbe = &fdb->fdb_entry[fdb->fdb_entry_off];
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fbe->fbe_name = fdb->fdb_name + fdb->fdb_name_off;
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memcpy(fbe->fbe_name, name, length);
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fbe->fbe_length = length;
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fbe->fbe_offset = offset;
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fbe->fbe_inum = *inum;
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fbe->fbe_type = type;
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fdb->fdb_entry_off++;
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fdb->fdb_name_off += length;
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if (!(length == 1 && *name == '.')) {
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gfs2_glock_prefetch_num(sdp,
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inum->no_addr, &gfs2_inode_glops,
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LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
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gfs2_glock_prefetch_num(sdp,
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inum->no_addr, &gfs2_iopen_glops,
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LM_ST_SHARED, LM_FLAG_TRY);
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}
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return 0;
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}
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/**
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* readdir_bad - Read directory entries from a directory
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* @file: The directory to read from
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* @dirent: Buffer for dirents
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* @filldir: Function used to do the copying
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*
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* For supporting NFS.
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*
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* Returns: errno
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*/
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static int readdir_bad(struct file *file, void *dirent, filldir_t filldir)
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{
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struct inode *dir = file->f_mapping->host;
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct filldir_reg fdr;
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unsigned int entries, size;
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struct filldir_bad *fdb;
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struct gfs2_holder d_gh;
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u64 offset = file->f_pos;
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unsigned int x;
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struct filldir_bad_entry *fbe;
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int error;
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entries = gfs2_tune_get(sdp, gt_entries_per_readdir);
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size = sizeof(struct filldir_bad) +
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entries * (sizeof(struct filldir_bad_entry) + GFS2_FAST_NAME_SIZE);
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fdb = kzalloc(size, GFP_KERNEL);
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if (!fdb)
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return -ENOMEM;
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fdb->fdb_sbd = sdp;
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fdb->fdb_entry = (struct filldir_bad_entry *)(fdb + 1);
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fdb->fdb_entry_num = entries;
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fdb->fdb_name = ((char *)fdb) + sizeof(struct filldir_bad) +
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entries * sizeof(struct filldir_bad_entry);
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fdb->fdb_name_size = entries * GFS2_FAST_NAME_SIZE;
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gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
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error = gfs2_glock_nq_atime(&d_gh);
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if (error) {
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gfs2_holder_uninit(&d_gh);
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goto out;
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}
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error = gfs2_dir_read(dir, &offset, fdb, filldir_bad_func);
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gfs2_glock_dq_uninit(&d_gh);
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fdr.fdr_sbd = sdp;
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fdr.fdr_prefetch = 0;
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fdr.fdr_filldir = filldir;
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fdr.fdr_opaque = dirent;
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for (x = 0; x < fdb->fdb_entry_off; x++) {
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fbe = &fdb->fdb_entry[x];
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error = filldir_reg_func(&fdr,
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fbe->fbe_name, fbe->fbe_length,
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fbe->fbe_offset,
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&fbe->fbe_inum, fbe->fbe_type);
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if (error) {
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file->f_pos = fbe->fbe_offset;
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error = 0;
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goto out;
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}
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}
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file->f_pos = offset;
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out:
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kfree(fdb);
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return error;
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}
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/**
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* gfs2_readdir - Read directory entries from a directory
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* @file: The directory to read from
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* @dirent: Buffer for dirents
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* @filldir: Function used to do the copying
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*
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* Returns: errno
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*/
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static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
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{
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int error;
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if (strcmp(current->comm, "nfsd") != 0)
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error = readdir_reg(file, dirent, filldir);
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else
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error = readdir_bad(file, dirent, filldir);
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return error;
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}
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static const u32 iflags_to_gfs2[32] = {
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[iflag_Sync] = GFS2_DIF_SYNC,
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[iflag_Immutable] = GFS2_DIF_IMMUTABLE,
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[iflag_Append] = GFS2_DIF_APPENDONLY,
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[iflag_NoAtime] = GFS2_DIF_NOATIME,
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[iflag_Index] = GFS2_DIF_EXHASH,
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[iflag_JournalData] = GFS2_DIF_JDATA,
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[iflag_DirectIO] = GFS2_DIF_DIRECTIO,
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};
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static const u32 gfs2_to_iflags[32] = {
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[gfs2fl_Sync] = IFLAG_SYNC,
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[gfs2fl_Immutable] = IFLAG_IMMUTABLE,
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[gfs2fl_AppendOnly] = IFLAG_APPEND,
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[gfs2fl_NoAtime] = IFLAG_NOATIME,
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[gfs2fl_ExHash] = IFLAG_INDEX,
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[gfs2fl_Jdata] = IFLAG_JOURNAL_DATA,
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[gfs2fl_Directio] = IFLAG_DIRECTIO,
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[gfs2fl_InheritDirectio] = IFLAG_DIRECTIO,
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[gfs2fl_InheritJdata] = IFLAG_JOURNAL_DATA,
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};
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static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder gh;
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int error;
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u32 iflags;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
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error = gfs2_glock_nq_m_atime(1, &gh);
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if (error)
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return error;
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iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags);
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if (put_user(iflags, ptr))
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error = -EFAULT;
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gfs2_glock_dq_m(1, &gh);
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gfs2_holder_uninit(&gh);
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return error;
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}
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/* Flags that can be set by user space */
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#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
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GFS2_DIF_DIRECTIO| \
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GFS2_DIF_IMMUTABLE| \
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GFS2_DIF_APPENDONLY| \
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GFS2_DIF_NOATIME| \
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GFS2_DIF_SYNC| \
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GFS2_DIF_SYSTEM| \
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GFS2_DIF_INHERIT_DIRECTIO| \
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GFS2_DIF_INHERIT_JDATA)
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/**
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* gfs2_set_flags - set flags on an inode
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* @inode: The inode
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* @flags: The flags to set
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* @mask: Indicates which flags are valid
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*
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*/
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static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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struct buffer_head *bh;
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struct gfs2_holder gh;
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int error;
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u32 new_flags, flags;
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
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if (error)
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return error;
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flags = ip->i_di.di_flags;
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new_flags = (flags & ~mask) | (reqflags & mask);
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if ((new_flags ^ flags) == 0)
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goto out;
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if (S_ISDIR(inode->i_mode)) {
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if ((new_flags ^ flags) & GFS2_DIF_JDATA)
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new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
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if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
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new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
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}
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error = -EINVAL;
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if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
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goto out;
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error = -EPERM;
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if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
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goto out;
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if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
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goto out;
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if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
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!capable(CAP_LINUX_IMMUTABLE))
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goto out;
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if (!IS_IMMUTABLE(inode)) {
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error = permission(inode, MAY_WRITE, NULL);
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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_di.di_flags = new_flags;
|
|
gfs2_dinode_out(&ip->i_di, bh->b_data);
|
|
brelse(bh);
|
|
out_trans_end:
|
|
gfs2_trans_end(sdp);
|
|
out:
|
|
gfs2_glock_dq_uninit(&gh);
|
|
return error;
|
|
}
|
|
|
|
static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
|
|
{
|
|
u32 iflags, gfsflags;
|
|
if (get_user(iflags, ptr))
|
|
return -EFAULT;
|
|
gfsflags = iflags_cvt(iflags_to_gfs2, iflags);
|
|
return do_gfs2_set_flags(filp, gfsflags, ~0);
|
|
}
|
|
|
|
static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch(cmd) {
|
|
case IFLAGS_GET_IOC:
|
|
return gfs2_get_flags(filp, (u32 __user *)arg);
|
|
case IFLAGS_SET_IOC:
|
|
return gfs2_set_flags(filp, (u32 __user *)arg);
|
|
}
|
|
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 = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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 = 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_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;
|
|
|
|
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
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
|
|
|
|
gfs2_log_flush(ip->i_gl->gl_sbd, 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 = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
struct lm_lockname name =
|
|
{ .ln_number = ip->i_num.no_addr,
|
|
.ln_type = LM_TYPE_PLOCK };
|
|
|
|
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;
|
|
int ret;
|
|
ret = posix_test_lock(file, fl, &tmp);
|
|
fl->fl_type = F_UNLCK;
|
|
if (ret)
|
|
memcpy(fl, &tmp, sizeof(struct file_lock));
|
|
return 0;
|
|
} else {
|
|
return posix_lock_file_wait(file, fl);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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_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;
|
|
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(GFS2_SB(&ip->i_inode),
|
|
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(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);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
|
|
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);
|
|
}
|
|
|
|
const struct file_operations gfs2_file_fops = {
|
|
.llseek = gfs2_llseek,
|
|
.read = generic_file_read,
|
|
.readv = generic_file_readv,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = generic_file_write,
|
|
.writev = generic_file_writev,
|
|
.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,
|
|
.sendfile = generic_file_sendfile,
|
|
.flock = gfs2_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|