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![Andreas Gruenbacher](/assets/img/avatar_default.png)
Switch to a simple array for mapping between the FS_*_FL and GFS_DIF_* flags. Clarify how the mapping between FS_JOURNAL_DATA_FL and the filesystem flags works. The GFS2_DIF_SYSTEM flag cannot be set from user space, so remove it from GFS2_FLAGS_USER_SET. Fail with -EINVAL when trying to set flags that are not supported instead of silently ignoring those flags. Partially fixes xfstest generic/424. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Andrew Price <anprice@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
1172 lines
29 KiB
C
1172 lines
29 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/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/mount.h>
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#include <linux/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/falloc.h>
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#include <linux/swap.h>
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#include <linux/crc32.h>
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#include <linux/writeback.h>
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#include <linux/uaccess.h>
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#include <linux/dlm.h>
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#include <linux/dlm_plock.h>
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#include <linux/delay.h>
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#include "gfs2.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 "log.h"
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#include "meta_io.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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/**
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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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* @whence: 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 whence)
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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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switch (whence) {
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case SEEK_END:
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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 = generic_file_llseek(file, offset, whence);
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gfs2_glock_dq_uninit(&i_gh);
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}
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break;
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case SEEK_DATA:
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error = gfs2_seek_data(file, offset);
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break;
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case SEEK_HOLE:
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error = gfs2_seek_hole(file, offset);
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break;
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case SEEK_CUR:
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case SEEK_SET:
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/*
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* These don't reference inode->i_size and don't depend on the
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* block mapping, so we don't need the glock.
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*/
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error = generic_file_llseek(file, offset, whence);
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break;
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default:
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error = -EINVAL;
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}
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return error;
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}
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/**
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* gfs2_readdir - Iterator for a directory
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* @file: The directory to read from
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* @ctx: What to feed directory entries to
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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, struct dir_context *ctx)
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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_holder d_gh;
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int error;
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
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if (error)
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return error;
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error = gfs2_dir_read(dir, ctx, &file->f_ra);
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gfs2_glock_dq_uninit(&d_gh);
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return error;
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}
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/**
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* fsflag_gfs2flag
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*
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* The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
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* and to GFS2_DIF_JDATA for non-directories.
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*/
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static struct {
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u32 fsflag;
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u32 gfsflag;
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} fsflag_gfs2flag[] = {
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{FS_SYNC_FL, GFS2_DIF_SYNC},
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{FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
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{FS_APPEND_FL, GFS2_DIF_APPENDONLY},
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{FS_NOATIME_FL, GFS2_DIF_NOATIME},
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{FS_INDEX_FL, GFS2_DIF_EXHASH},
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{FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
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{FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
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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 = file_inode(filp);
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder gh;
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int i, error;
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u32 gfsflags, fsflags = 0;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
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error = gfs2_glock_nq(&gh);
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if (error)
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goto out_uninit;
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gfsflags = ip->i_diskflags;
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if (S_ISDIR(inode->i_mode))
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gfsflags &= ~GFS2_DIF_JDATA;
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else
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gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
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for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
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if (gfsflags & fsflag_gfs2flag[i].gfsflag)
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fsflags |= fsflag_gfs2flag[i].fsflag;
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if (put_user(fsflags, ptr))
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error = -EFAULT;
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gfs2_glock_dq(&gh);
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out_uninit:
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gfs2_holder_uninit(&gh);
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return error;
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}
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void gfs2_set_inode_flags(struct inode *inode)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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unsigned int flags = inode->i_flags;
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flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
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if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
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flags |= S_NOSEC;
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if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
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flags |= S_IMMUTABLE;
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if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
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flags |= S_APPEND;
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if (ip->i_diskflags & GFS2_DIF_NOATIME)
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flags |= S_NOATIME;
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if (ip->i_diskflags & GFS2_DIF_SYNC)
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flags |= S_SYNC;
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inode->i_flags = flags;
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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_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_TOPDIR| \
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GFS2_DIF_INHERIT_JDATA)
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/**
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* do_gfs2_set_flags - set flags on an inode
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* @filp: file pointer
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* @reqflags: 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 = file_inode(filp);
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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 = mnt_want_write_file(filp);
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if (error)
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return error;
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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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goto out_drop_write;
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error = -EACCES;
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if (!inode_owner_or_capable(inode))
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goto out;
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error = 0;
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flags = ip->i_diskflags;
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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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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 = gfs2_permission(inode, MAY_WRITE);
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if (error)
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goto out;
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}
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if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
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if (new_flags & GFS2_DIF_JDATA)
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gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
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error = filemap_fdatawrite(inode->i_mapping);
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if (error)
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goto out;
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error = filemap_fdatawait(inode->i_mapping);
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if (error)
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goto out;
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if (new_flags & GFS2_DIF_JDATA)
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gfs2_ordered_del_inode(ip);
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}
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error = gfs2_trans_begin(sdp, RES_DINODE, 0);
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if (error)
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goto out;
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error = gfs2_meta_inode_buffer(ip, &bh);
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if (error)
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goto out_trans_end;
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inode->i_ctime = current_time(inode);
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gfs2_trans_add_meta(ip->i_gl, bh);
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ip->i_diskflags = new_flags;
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gfs2_dinode_out(ip, bh->b_data);
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brelse(bh);
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gfs2_set_inode_flags(inode);
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gfs2_set_aops(inode);
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out_trans_end:
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gfs2_trans_end(sdp);
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out:
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gfs2_glock_dq_uninit(&gh);
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out_drop_write:
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mnt_drop_write_file(filp);
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return error;
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}
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static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
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{
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struct inode *inode = file_inode(filp);
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u32 fsflags, gfsflags = 0;
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u32 mask;
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int i;
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if (get_user(fsflags, ptr))
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return -EFAULT;
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for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
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if (fsflags & fsflag_gfs2flag[i].fsflag) {
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fsflags &= ~fsflag_gfs2flag[i].fsflag;
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gfsflags |= fsflag_gfs2flag[i].gfsflag;
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}
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}
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if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
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return -EINVAL;
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mask = GFS2_FLAGS_USER_SET;
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if (S_ISDIR(inode->i_mode)) {
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mask &= ~GFS2_DIF_JDATA;
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} else {
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/* The GFS2_DIF_TOPDIR flag is only valid for directories. */
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if (gfsflags & GFS2_DIF_TOPDIR)
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return -EINVAL;
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mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
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}
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return do_gfs2_set_flags(filp, gfsflags, mask);
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}
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static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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switch(cmd) {
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case FS_IOC_GETFLAGS:
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return gfs2_get_flags(filp, (u32 __user *)arg);
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case FS_IOC_SETFLAGS:
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return gfs2_set_flags(filp, (u32 __user *)arg);
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case FITRIM:
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return gfs2_fitrim(filp, (void __user *)arg);
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}
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return -ENOTTY;
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}
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/**
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* gfs2_size_hint - Give a hint to the size of a write request
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* @filep: The struct file
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* @offset: The file offset of the write
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* @size: The length of the write
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*
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* When we are about to do a write, this function records the total
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* write size in order to provide a suitable hint to the lower layers
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* about how many blocks will be required.
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*
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*/
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static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
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{
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struct inode *inode = file_inode(filep);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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struct gfs2_inode *ip = GFS2_I(inode);
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size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
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int hint = min_t(size_t, INT_MAX, blks);
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if (hint > atomic_read(&ip->i_res.rs_sizehint))
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atomic_set(&ip->i_res.rs_sizehint, hint);
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}
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/**
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* gfs2_allocate_page_backing - Use bmap to allocate blocks
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* @page: The (locked) page to allocate backing for
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*
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* We try to allocate all the blocks required for the page in
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* one go. This might fail for various reasons, so we keep
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* trying until all the blocks to back this page are allocated.
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* If some of the blocks are already allocated, thats ok too.
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*/
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static int gfs2_allocate_page_backing(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct buffer_head bh;
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unsigned long size = PAGE_SIZE;
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u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits);
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do {
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bh.b_state = 0;
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bh.b_size = size;
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gfs2_block_map(inode, lblock, &bh, 1);
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if (!buffer_mapped(&bh))
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return -EIO;
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size -= bh.b_size;
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lblock += (bh.b_size >> inode->i_blkbits);
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} while(size > 0);
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return 0;
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}
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|
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/**
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* gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
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* @vma: The virtual memory area
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* @vmf: The virtual memory fault containing the page to become writable
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*
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* When the page becomes writable, we need to ensure that we have
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* blocks allocated on disk to back that page.
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*/
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|
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static int gfs2_page_mkwrite(struct vm_fault *vmf)
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{
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struct page *page = vmf->page;
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struct inode *inode = file_inode(vmf->vma->vm_file);
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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 gfs2_alloc_parms ap = { .aflags = 0, };
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unsigned long last_index;
|
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u64 pos = page->index << PAGE_SHIFT;
|
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unsigned int data_blocks, ind_blocks, rblocks;
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struct gfs2_holder gh;
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loff_t size;
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int ret;
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|
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sb_start_pagefault(inode->i_sb);
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|
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ret = gfs2_rsqa_alloc(ip);
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if (ret)
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goto out;
|
|
|
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gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
|
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|
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
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ret = gfs2_glock_nq(&gh);
|
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if (ret)
|
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goto out_uninit;
|
|
|
|
/* Update file times before taking page lock */
|
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file_update_time(vmf->vma->vm_file);
|
|
|
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set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
|
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set_bit(GIF_SW_PAGED, &ip->i_flags);
|
|
|
|
if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
|
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lock_page(page);
|
|
if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
|
|
ret = -EAGAIN;
|
|
unlock_page(page);
|
|
}
|
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goto out_unlock;
|
|
}
|
|
|
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ret = gfs2_rindex_update(sdp);
|
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if (ret)
|
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goto out_unlock;
|
|
|
|
gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
|
|
ap.target = data_blocks + ind_blocks;
|
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ret = gfs2_quota_lock_check(ip, &ap);
|
|
if (ret)
|
|
goto out_unlock;
|
|
ret = gfs2_inplace_reserve(ip, &ap);
|
|
if (ret)
|
|
goto out_quota_unlock;
|
|
|
|
rblocks = RES_DINODE + ind_blocks;
|
|
if (gfs2_is_jdata(ip))
|
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rblocks += data_blocks ? data_blocks : 1;
|
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if (ind_blocks || data_blocks) {
|
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rblocks += RES_STATFS + RES_QUOTA;
|
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rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
|
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}
|
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ret = gfs2_trans_begin(sdp, rblocks, 0);
|
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if (ret)
|
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goto out_trans_fail;
|
|
|
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lock_page(page);
|
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ret = -EINVAL;
|
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size = i_size_read(inode);
|
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last_index = (size - 1) >> PAGE_SHIFT;
|
|
/* Check page index against inode size */
|
|
if (size == 0 || (page->index > last_index))
|
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goto out_trans_end;
|
|
|
|
ret = -EAGAIN;
|
|
/* If truncated, we must retry the operation, we may have raced
|
|
* with the glock demotion code.
|
|
*/
|
|
if (!PageUptodate(page) || page->mapping != inode->i_mapping)
|
|
goto out_trans_end;
|
|
|
|
/* Unstuff, if required, and allocate backing blocks for page */
|
|
ret = 0;
|
|
if (gfs2_is_stuffed(ip))
|
|
ret = gfs2_unstuff_dinode(ip, page);
|
|
if (ret == 0)
|
|
ret = gfs2_allocate_page_backing(page);
|
|
|
|
out_trans_end:
|
|
if (ret)
|
|
unlock_page(page);
|
|
gfs2_trans_end(sdp);
|
|
out_trans_fail:
|
|
gfs2_inplace_release(ip);
|
|
out_quota_unlock:
|
|
gfs2_quota_unlock(ip);
|
|
out_unlock:
|
|
gfs2_glock_dq(&gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&gh);
|
|
if (ret == 0) {
|
|
set_page_dirty(page);
|
|
wait_for_stable_page(page);
|
|
}
|
|
out:
|
|
sb_end_pagefault(inode->i_sb);
|
|
return block_page_mkwrite_return(ret);
|
|
}
|
|
|
|
static const struct vm_operations_struct gfs2_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.map_pages = filemap_map_pages,
|
|
.page_mkwrite = gfs2_page_mkwrite,
|
|
};
|
|
|
|
/**
|
|
* gfs2_mmap -
|
|
* @file: The file to map
|
|
* @vma: The VMA which described the mapping
|
|
*
|
|
* There is no need to get a lock here unless we should be updating
|
|
* atime. We ignore any locking errors since the only consequence is
|
|
* a missed atime update (which will just be deferred until later).
|
|
*
|
|
* Returns: 0
|
|
*/
|
|
|
|
static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
|
|
if (!(file->f_flags & O_NOATIME) &&
|
|
!IS_NOATIME(&ip->i_inode)) {
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
|
|
&i_gh);
|
|
if (error)
|
|
return error;
|
|
/* grab lock to update inode */
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
file_accessed(file);
|
|
}
|
|
vma->vm_ops = &gfs2_vm_ops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_open_common - This is common to open and atomic_open
|
|
* @inode: The inode being opened
|
|
* @file: The file being opened
|
|
*
|
|
* This maybe called under a glock or not depending upon how it has
|
|
* been called. We must always be called under a glock for regular
|
|
* files, however. For other file types, it does not matter whether
|
|
* we hold the glock or not.
|
|
*
|
|
* Returns: Error code or 0 for success
|
|
*/
|
|
|
|
int gfs2_open_common(struct inode *inode, struct file *file)
|
|
{
|
|
struct gfs2_file *fp;
|
|
int ret;
|
|
|
|
if (S_ISREG(inode->i_mode)) {
|
|
ret = generic_file_open(inode, file);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
|
|
if (!fp)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&fp->f_fl_mutex);
|
|
|
|
gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
|
|
file->private_data = fp;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_open - open a file
|
|
* @inode: the inode to open
|
|
* @file: the struct file for this opening
|
|
*
|
|
* After atomic_open, this function is only used for opening files
|
|
* which are already cached. We must still get the glock for regular
|
|
* files to ensure that we have the file size uptodate for the large
|
|
* file check which is in the common code. That is only an issue for
|
|
* regular files though.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
bool need_unlock = false;
|
|
|
|
if (S_ISREG(ip->i_inode.i_mode)) {
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
|
|
&i_gh);
|
|
if (error)
|
|
return error;
|
|
need_unlock = true;
|
|
}
|
|
|
|
error = gfs2_open_common(inode, file);
|
|
|
|
if (need_unlock)
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_release - 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_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
|
|
if (!(file->f_mode & FMODE_WRITE))
|
|
return 0;
|
|
|
|
gfs2_rsqa_delete(ip, &inode->i_writecount);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_fsync - sync the dirty data for a file (across the cluster)
|
|
* @file: the file that points to the dentry
|
|
* @start: the start position in the file to sync
|
|
* @end: the end position in the file to sync
|
|
* @datasync: set if we can ignore timestamp changes
|
|
*
|
|
* We split the data flushing here so that we don't wait for the data
|
|
* until after we've also sent the metadata to disk. Note that for
|
|
* data=ordered, we will write & wait for the data at the log flush
|
|
* stage anyway, so this is unlikely to make much of a difference
|
|
* except in the data=writeback case.
|
|
*
|
|
* If the fdatawrite fails due to any reason except -EIO, we will
|
|
* continue the remainder of the fsync, although we'll still report
|
|
* the error at the end. This is to match filemap_write_and_wait_range()
|
|
* behaviour.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
int sync_state = inode->i_state & I_DIRTY_ALL;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
int ret = 0, ret1 = 0;
|
|
|
|
if (mapping->nrpages) {
|
|
ret1 = filemap_fdatawrite_range(mapping, start, end);
|
|
if (ret1 == -EIO)
|
|
return ret1;
|
|
}
|
|
|
|
if (!gfs2_is_jdata(ip))
|
|
sync_state &= ~I_DIRTY_PAGES;
|
|
if (datasync)
|
|
sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
|
|
|
|
if (sync_state) {
|
|
ret = sync_inode_metadata(inode, 1);
|
|
if (ret)
|
|
return ret;
|
|
if (gfs2_is_jdata(ip))
|
|
ret = file_write_and_wait(file);
|
|
if (ret)
|
|
return ret;
|
|
gfs2_ail_flush(ip->i_gl, 1);
|
|
}
|
|
|
|
if (mapping->nrpages)
|
|
ret = file_fdatawait_range(file, start, end);
|
|
|
|
return ret ? ret : ret1;
|
|
}
|
|
|
|
/**
|
|
* gfs2_file_write_iter - Perform a write to a file
|
|
* @iocb: The io context
|
|
* @iov: The data to write
|
|
* @nr_segs: Number of @iov segments
|
|
* @pos: The file position
|
|
*
|
|
* We have to do a lock/unlock here to refresh the inode size for
|
|
* O_APPEND writes, otherwise we can land up writing at the wrong
|
|
* offset. There is still a race, but provided the app is using its
|
|
* own file locking, this will make O_APPEND work as expected.
|
|
*
|
|
*/
|
|
|
|
static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct gfs2_inode *ip = GFS2_I(file_inode(file));
|
|
int ret;
|
|
|
|
ret = gfs2_rsqa_alloc(ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
|
|
|
|
if (iocb->ki_flags & IOCB_APPEND) {
|
|
struct gfs2_holder gh;
|
|
|
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
|
|
if (ret)
|
|
return ret;
|
|
gfs2_glock_dq_uninit(&gh);
|
|
}
|
|
|
|
return generic_file_write_iter(iocb, from);
|
|
}
|
|
|
|
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
|
|
int mode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct buffer_head *dibh;
|
|
int error;
|
|
unsigned int nr_blks;
|
|
sector_t lblock = offset >> inode->i_blkbits;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (unlikely(error))
|
|
return error;
|
|
|
|
gfs2_trans_add_meta(ip->i_gl, dibh);
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = gfs2_unstuff_dinode(ip, NULL);
|
|
if (unlikely(error))
|
|
goto out;
|
|
}
|
|
|
|
while (len) {
|
|
struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
|
|
bh_map.b_size = len;
|
|
set_buffer_zeronew(&bh_map);
|
|
|
|
error = gfs2_block_map(inode, lblock, &bh_map, 1);
|
|
if (unlikely(error))
|
|
goto out;
|
|
len -= bh_map.b_size;
|
|
nr_blks = bh_map.b_size >> inode->i_blkbits;
|
|
lblock += nr_blks;
|
|
if (!buffer_new(&bh_map))
|
|
continue;
|
|
if (unlikely(!buffer_zeronew(&bh_map))) {
|
|
error = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
brelse(dibh);
|
|
return error;
|
|
}
|
|
/**
|
|
* calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
|
|
* blocks, determine how many bytes can be written.
|
|
* @ip: The inode in question.
|
|
* @len: Max cap of bytes. What we return in *len must be <= this.
|
|
* @data_blocks: Compute and return the number of data blocks needed
|
|
* @ind_blocks: Compute and return the number of indirect blocks needed
|
|
* @max_blocks: The total blocks available to work with.
|
|
*
|
|
* Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
|
|
*/
|
|
static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
|
|
unsigned int *data_blocks, unsigned int *ind_blocks,
|
|
unsigned int max_blocks)
|
|
{
|
|
loff_t max = *len;
|
|
const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
|
|
|
|
for (tmp = max_data; tmp > sdp->sd_diptrs;) {
|
|
tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
|
|
max_data -= tmp;
|
|
}
|
|
|
|
*data_blocks = max_data;
|
|
*ind_blocks = max_blocks - max_data;
|
|
*len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
|
|
if (*len > max) {
|
|
*len = max;
|
|
gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
|
|
}
|
|
}
|
|
|
|
static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_alloc_parms ap = { .aflags = 0, };
|
|
unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
|
|
loff_t bytes, max_bytes, max_blks = UINT_MAX;
|
|
int error;
|
|
const loff_t pos = offset;
|
|
const loff_t count = len;
|
|
loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
|
|
loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
|
|
loff_t max_chunk_size = UINT_MAX & bsize_mask;
|
|
|
|
next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
|
|
|
|
offset &= bsize_mask;
|
|
|
|
len = next - offset;
|
|
bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
|
|
if (!bytes)
|
|
bytes = UINT_MAX;
|
|
bytes &= bsize_mask;
|
|
if (bytes == 0)
|
|
bytes = sdp->sd_sb.sb_bsize;
|
|
|
|
gfs2_size_hint(file, offset, len);
|
|
|
|
gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
|
|
ap.min_target = data_blocks + ind_blocks;
|
|
|
|
while (len > 0) {
|
|
if (len < bytes)
|
|
bytes = len;
|
|
if (!gfs2_write_alloc_required(ip, offset, bytes)) {
|
|
len -= bytes;
|
|
offset += bytes;
|
|
continue;
|
|
}
|
|
|
|
/* We need to determine how many bytes we can actually
|
|
* fallocate without exceeding quota or going over the
|
|
* end of the fs. We start off optimistically by assuming
|
|
* we can write max_bytes */
|
|
max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
|
|
|
|
/* Since max_bytes is most likely a theoretical max, we
|
|
* calculate a more realistic 'bytes' to serve as a good
|
|
* starting point for the number of bytes we may be able
|
|
* to write */
|
|
gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
|
|
ap.target = data_blocks + ind_blocks;
|
|
|
|
error = gfs2_quota_lock_check(ip, &ap);
|
|
if (error)
|
|
return error;
|
|
/* ap.allowed tells us how many blocks quota will allow
|
|
* us to write. Check if this reduces max_blks */
|
|
if (ap.allowed && ap.allowed < max_blks)
|
|
max_blks = ap.allowed;
|
|
|
|
error = gfs2_inplace_reserve(ip, &ap);
|
|
if (error)
|
|
goto out_qunlock;
|
|
|
|
/* check if the selected rgrp limits our max_blks further */
|
|
if (ap.allowed && ap.allowed < max_blks)
|
|
max_blks = ap.allowed;
|
|
|
|
/* Almost done. Calculate bytes that can be written using
|
|
* max_blks. We also recompute max_bytes, data_blocks and
|
|
* ind_blocks */
|
|
calc_max_reserv(ip, &max_bytes, &data_blocks,
|
|
&ind_blocks, max_blks);
|
|
|
|
rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
|
|
RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
|
|
if (gfs2_is_jdata(ip))
|
|
rblocks += data_blocks ? data_blocks : 1;
|
|
|
|
error = gfs2_trans_begin(sdp, rblocks,
|
|
PAGE_SIZE/sdp->sd_sb.sb_bsize);
|
|
if (error)
|
|
goto out_trans_fail;
|
|
|
|
error = fallocate_chunk(inode, offset, max_bytes, mode);
|
|
gfs2_trans_end(sdp);
|
|
|
|
if (error)
|
|
goto out_trans_fail;
|
|
|
|
len -= max_bytes;
|
|
offset += max_bytes;
|
|
gfs2_inplace_release(ip);
|
|
gfs2_quota_unlock(ip);
|
|
}
|
|
|
|
if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
|
|
i_size_write(inode, pos + count);
|
|
file_update_time(file);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
|
|
return vfs_fsync_range(file, pos, pos + count - 1,
|
|
(file->f_flags & __O_SYNC) ? 0 : 1);
|
|
return 0;
|
|
|
|
out_trans_fail:
|
|
gfs2_inplace_release(ip);
|
|
out_qunlock:
|
|
gfs2_quota_unlock(ip);
|
|
return error;
|
|
}
|
|
|
|
static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
int ret;
|
|
|
|
if (mode & ~FALLOC_FL_KEEP_SIZE)
|
|
return -EOPNOTSUPP;
|
|
/* fallocate is needed by gfs2_grow to reserve space in the rindex */
|
|
if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
|
|
return -EOPNOTSUPP;
|
|
|
|
inode_lock(inode);
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
|
|
ret = gfs2_glock_nq(&gh);
|
|
if (ret)
|
|
goto out_uninit;
|
|
|
|
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
|
|
(offset + len) > inode->i_size) {
|
|
ret = inode_newsize_ok(inode, offset + len);
|
|
if (ret)
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = get_write_access(inode);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = gfs2_rsqa_alloc(ip);
|
|
if (ret)
|
|
goto out_putw;
|
|
|
|
ret = __gfs2_fallocate(file, mode, offset, len);
|
|
if (ret)
|
|
gfs2_rs_deltree(&ip->i_res);
|
|
|
|
out_putw:
|
|
put_write_access(inode);
|
|
out_unlock:
|
|
gfs2_glock_dq(&gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&gh);
|
|
inode_unlock(inode);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
|
|
struct file *out, loff_t *ppos,
|
|
size_t len, unsigned int flags)
|
|
{
|
|
int error;
|
|
struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
|
|
|
|
error = gfs2_rsqa_alloc(ip);
|
|
if (error)
|
|
return (ssize_t)error;
|
|
|
|
gfs2_size_hint(out, *ppos, len);
|
|
|
|
return iter_file_splice_write(pipe, out, ppos, len, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
|
|
|
|
/**
|
|
* gfs2_lock - acquire/release a posix lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
|
|
return -ENOLCK;
|
|
|
|
if (cmd == F_CANCELLK) {
|
|
/* Hack: */
|
|
cmd = F_SETLK;
|
|
fl->fl_type = F_UNLCK;
|
|
}
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
|
|
if (fl->fl_type == F_UNLCK)
|
|
locks_lock_file_wait(file, fl);
|
|
return -EIO;
|
|
}
|
|
if (IS_GETLK(cmd))
|
|
return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
|
|
else
|
|
return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
|
|
}
|
|
|
|
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
struct gfs2_inode *ip = GFS2_I(file_inode(file));
|
|
struct gfs2_glock *gl;
|
|
unsigned int state;
|
|
u16 flags;
|
|
int error = 0;
|
|
int sleeptime;
|
|
|
|
state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
|
|
flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
|
|
if (gfs2_holder_initialized(fl_gh)) {
|
|
if (fl_gh->gh_state == state)
|
|
goto out;
|
|
locks_lock_file_wait(file,
|
|
&(struct file_lock) {
|
|
.fl_type = F_UNLCK,
|
|
.fl_flags = FL_FLOCK
|
|
});
|
|
gfs2_glock_dq(fl_gh);
|
|
gfs2_holder_reinit(state, flags, fl_gh);
|
|
} else {
|
|
error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
|
|
&gfs2_flock_glops, CREATE, &gl);
|
|
if (error)
|
|
goto out;
|
|
gfs2_holder_init(gl, state, flags, fl_gh);
|
|
gfs2_glock_put(gl);
|
|
}
|
|
for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
|
|
error = gfs2_glock_nq(fl_gh);
|
|
if (error != GLR_TRYFAILED)
|
|
break;
|
|
fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
|
|
fl_gh->gh_error = 0;
|
|
msleep(sleeptime);
|
|
}
|
|
if (error) {
|
|
gfs2_holder_uninit(fl_gh);
|
|
if (error == GLR_TRYFAILED)
|
|
error = -EAGAIN;
|
|
} else {
|
|
error = locks_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);
|
|
locks_lock_file_wait(file, fl);
|
|
if (gfs2_holder_initialized(fl_gh)) {
|
|
gfs2_glock_dq(fl_gh);
|
|
gfs2_holder_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)
|
|
{
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
if (fl->fl_type & LOCK_MAND)
|
|
return -EOPNOTSUPP;
|
|
|
|
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_iter = generic_file_read_iter,
|
|
.write_iter = gfs2_file_write_iter,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_release,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = gfs2_file_splice_write,
|
|
.setlease = simple_nosetlease,
|
|
.fallocate = gfs2_fallocate,
|
|
};
|
|
|
|
const struct file_operations gfs2_dir_fops = {
|
|
.iterate_shared = gfs2_readdir,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_release,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
|
|
|
|
const struct file_operations gfs2_file_fops_nolock = {
|
|
.llseek = gfs2_llseek,
|
|
.read_iter = generic_file_read_iter,
|
|
.write_iter = gfs2_file_write_iter,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_release,
|
|
.fsync = gfs2_fsync,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = gfs2_file_splice_write,
|
|
.setlease = generic_setlease,
|
|
.fallocate = gfs2_fallocate,
|
|
};
|
|
|
|
const struct file_operations gfs2_dir_fops_nolock = {
|
|
.iterate_shared = gfs2_readdir,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_release,
|
|
.fsync = gfs2_fsync,
|
|
.llseek = default_llseek,
|
|
};
|
|
|