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![Serge E. Hallyn](/assets/img/avatar_default.png)
And give it a kernel-doc comment. [akpm@linux-foundation.org: btrfs changed in linux-next] Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Daniel Lezcano <daniel.lezcano@free.fr> Acked-by: David Howells <dhowells@redhat.com> Cc: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1078 lines
26 KiB
C
1078 lines
26 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/ext2_fs.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 <asm/uaccess.h>
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#include <linux/dlm.h>
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#include <linux/dlm_plock.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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* @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 = generic_file_llseek_unlocked(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 = generic_file_llseek_unlocked(file, offset, origin);
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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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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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u64 offset = file->f_pos;
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int error;
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gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
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error = gfs2_glock_nq(&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, dirent, filldir);
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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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* fsflags_cvt
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* @table: A table of 32 u32 flags
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* @val: a 32 bit value to convert
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*
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* This function can be used to convert between fsflags values and
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* GFS2's own flags values.
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*
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* Returns: the converted flags
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*/
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static u32 fsflags_cvt(const u32 *table, u32 val)
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{
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u32 res = 0;
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while(val) {
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if (val & 1)
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res |= *table;
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table++;
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val >>= 1;
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}
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return res;
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}
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static const u32 fsflags_to_gfs2[32] = {
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[3] = GFS2_DIF_SYNC,
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[4] = GFS2_DIF_IMMUTABLE,
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[5] = GFS2_DIF_APPENDONLY,
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[7] = GFS2_DIF_NOATIME,
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[12] = GFS2_DIF_EXHASH,
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[14] = GFS2_DIF_INHERIT_JDATA,
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};
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static const u32 gfs2_to_fsflags[32] = {
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[gfs2fl_Sync] = FS_SYNC_FL,
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[gfs2fl_Immutable] = FS_IMMUTABLE_FL,
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[gfs2fl_AppendOnly] = FS_APPEND_FL,
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[gfs2fl_NoAtime] = FS_NOATIME_FL,
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[gfs2fl_ExHash] = FS_INDEX_FL,
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[gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
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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_path.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 fsflags;
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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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return error;
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fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
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if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
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fsflags |= FS_JOURNAL_DATA_FL;
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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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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);
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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_SYSTEM| \
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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_path.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 = mnt_want_write(filp->f_path.mnt);
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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 = -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 = gfs2_permission(inode, MAY_WRITE, 0);
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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 (flags & GFS2_DIF_JDATA)
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gfs2_log_flush(sdp, ip->i_gl);
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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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}
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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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gfs2_trans_add_bh(ip->i_gl, bh, 1);
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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(filp->f_path.mnt);
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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 = filp->f_path.dentry->d_inode;
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u32 fsflags, gfsflags;
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if (get_user(fsflags, ptr))
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return -EFAULT;
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gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
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if (!S_ISDIR(inode->i_mode)) {
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if (gfsflags & GFS2_DIF_INHERIT_JDATA)
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gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
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return do_gfs2_set_flags(filp, gfsflags, ~0);
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}
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return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
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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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}
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return -ENOTTY;
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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_CACHE_SIZE;
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u64 lblock = page->index << (PAGE_CACHE_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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* gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
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* @vma: The virtual memory area
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* @page: The page which is about 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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static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct page *page = vmf->page;
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struct inode *inode = vma->vm_file->f_path.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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unsigned long last_index;
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u64 pos = page->index << PAGE_CACHE_SHIFT;
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unsigned int data_blocks, ind_blocks, rblocks;
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struct gfs2_holder gh;
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struct gfs2_alloc *al;
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int ret;
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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;
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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);
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if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE))
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goto out_unlock;
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ret = -ENOMEM;
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al = gfs2_alloc_get(ip);
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if (al == NULL)
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goto out_unlock;
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ret = gfs2_quota_lock_check(ip);
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if (ret)
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goto out_alloc_put;
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gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
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al->al_requested = data_blocks + ind_blocks;
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ret = gfs2_inplace_reserve(ip);
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if (ret)
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goto out_quota_unlock;
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rblocks = RES_DINODE + ind_blocks;
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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(al);
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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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last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
|
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if (page->index > last_index)
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goto out_unlock_page;
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ret = 0;
|
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if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
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goto out_unlock_page;
|
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if (gfs2_is_stuffed(ip)) {
|
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ret = gfs2_unstuff_dinode(ip, page);
|
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if (ret)
|
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goto out_unlock_page;
|
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}
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ret = gfs2_allocate_page_backing(page);
|
|
|
|
out_unlock_page:
|
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unlock_page(page);
|
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gfs2_trans_end(sdp);
|
|
out_trans_fail:
|
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gfs2_inplace_release(ip);
|
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out_quota_unlock:
|
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gfs2_quota_unlock(ip);
|
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out_alloc_put:
|
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gfs2_alloc_put(ip);
|
|
out_unlock:
|
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gfs2_glock_dq(&gh);
|
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out:
|
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gfs2_holder_uninit(&gh);
|
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if (ret == -ENOMEM)
|
|
ret = VM_FAULT_OOM;
|
|
else if (ret)
|
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ret = VM_FAULT_SIGBUS;
|
|
return ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct gfs2_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.page_mkwrite = gfs2_page_mkwrite,
|
|
};
|
|
|
|
/**
|
|
* gfs2_mmap -
|
|
* @file: The file to map
|
|
* @vma: The VMA which described the mapping
|
|
*
|
|
* There is no need to get a lock here unless we should be updating
|
|
* atime. We ignore any locking errors since the only consequence is
|
|
* a missed atime update (which will just be deferred until later).
|
|
*
|
|
* Returns: 0
|
|
*/
|
|
|
|
static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
|
|
if (!(file->f_flags & O_NOATIME) &&
|
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!IS_NOATIME(&ip->i_inode)) {
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
|
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
|
|
error = gfs2_glock_nq(&i_gh);
|
|
if (error == 0) {
|
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file_accessed(file);
|
|
gfs2_glock_dq(&i_gh);
|
|
}
|
|
gfs2_holder_uninit(&i_gh);
|
|
if (error)
|
|
return error;
|
|
}
|
|
vma->vm_ops = &gfs2_vm_ops;
|
|
vma->vm_flags |= VM_CAN_NONLINEAR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_open - open a file
|
|
* @inode: the inode to open
|
|
* @file: the struct file for this opening
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder i_gh;
|
|
struct gfs2_file *fp;
|
|
int error;
|
|
|
|
fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
|
|
if (!fp)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&fp->f_fl_mutex);
|
|
|
|
gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
|
|
file->private_data = fp;
|
|
|
|
if (S_ISREG(ip->i_inode.i_mode)) {
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
|
|
&i_gh);
|
|
if (error)
|
|
goto fail;
|
|
|
|
if (!(file->f_flags & O_LARGEFILE) &&
|
|
i_size_read(inode) > MAX_NON_LFS) {
|
|
error = -EOVERFLOW;
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_gunlock:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
fail:
|
|
file->private_data = NULL;
|
|
kfree(fp);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_close - called to close a struct file
|
|
* @inode: the inode the struct file belongs to
|
|
* @file: the struct file being closed
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
|
|
struct gfs2_file *fp;
|
|
|
|
fp = file->private_data;
|
|
file->private_data = NULL;
|
|
|
|
if (gfs2_assert_warn(sdp, fp))
|
|
return -EIO;
|
|
|
|
kfree(fp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_fsync - sync the dirty data for a file (across the cluster)
|
|
* @file: the file that points to the dentry (we ignore this)
|
|
* @dentry: the dentry that points to the inode to sync
|
|
*
|
|
* The VFS will flush "normal" data for us. We only need to worry
|
|
* about metadata here. For journaled data, we just do a log flush
|
|
* as we can't avoid it. Otherwise we can just bale out if datasync
|
|
* is set. For stuffed inodes we must flush the log in order to
|
|
* ensure that all data is on disk.
|
|
*
|
|
* The call to write_inode_now() is there to write back metadata and
|
|
* the inode itself. It does also try and write the data, but thats
|
|
* (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
|
|
* for us.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_fsync(struct file *file, int datasync)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
|
|
int ret = 0;
|
|
|
|
if (gfs2_is_jdata(GFS2_I(inode))) {
|
|
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
|
|
return 0;
|
|
}
|
|
|
|
if (sync_state != 0) {
|
|
if (!datasync)
|
|
ret = write_inode_now(inode, 0);
|
|
|
|
if (gfs2_is_stuffed(GFS2_I(inode)))
|
|
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_file_aio_write - 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_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
|
|
if (file->f_flags & O_APPEND) {
|
|
struct dentry *dentry = file->f_dentry;
|
|
struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
|
|
struct gfs2_holder gh;
|
|
int ret;
|
|
|
|
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_aio_write(iocb, iov, nr_segs, pos);
|
|
}
|
|
|
|
static void empty_write_end(struct page *page, unsigned from,
|
|
unsigned to)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(page->mapping->host);
|
|
|
|
zero_user(page, from, to-from);
|
|
mark_page_accessed(page);
|
|
|
|
if (!gfs2_is_writeback(ip))
|
|
gfs2_page_add_databufs(ip, page, from, to);
|
|
|
|
block_commit_write(page, from, to);
|
|
}
|
|
|
|
static int needs_empty_write(sector_t block, struct inode *inode)
|
|
{
|
|
int error;
|
|
struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
|
|
|
|
bh_map.b_size = 1 << inode->i_blkbits;
|
|
error = gfs2_block_map(inode, block, &bh_map, 0);
|
|
if (unlikely(error))
|
|
return error;
|
|
return !buffer_mapped(&bh_map);
|
|
}
|
|
|
|
static int write_empty_blocks(struct page *page, unsigned from, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
unsigned start, end, next, blksize;
|
|
sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
|
|
int ret;
|
|
|
|
blksize = 1 << inode->i_blkbits;
|
|
next = end = 0;
|
|
while (next < from) {
|
|
next += blksize;
|
|
block++;
|
|
}
|
|
start = next;
|
|
do {
|
|
next += blksize;
|
|
ret = needs_empty_write(block, inode);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
if (ret == 0) {
|
|
if (end) {
|
|
ret = __block_write_begin(page, start, end - start,
|
|
gfs2_block_map);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
empty_write_end(page, start, end);
|
|
end = 0;
|
|
}
|
|
start = next;
|
|
}
|
|
else
|
|
end = next;
|
|
block++;
|
|
} while (next < to);
|
|
|
|
if (end) {
|
|
ret = __block_write_begin(page, start, end - start, gfs2_block_map);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
empty_write_end(page, start, end);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
u64 start = offset >> PAGE_CACHE_SHIFT;
|
|
unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
|
|
u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
|
|
pgoff_t curr;
|
|
struct page *page;
|
|
unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
|
|
unsigned int from, to;
|
|
|
|
if (!end_offset)
|
|
end_offset = PAGE_CACHE_SIZE;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (unlikely(error))
|
|
goto out;
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = gfs2_unstuff_dinode(ip, NULL);
|
|
if (unlikely(error))
|
|
goto out;
|
|
}
|
|
|
|
curr = start;
|
|
offset = start << PAGE_CACHE_SHIFT;
|
|
from = start_offset;
|
|
to = PAGE_CACHE_SIZE;
|
|
while (curr <= end) {
|
|
page = grab_cache_page_write_begin(inode->i_mapping, curr,
|
|
AOP_FLAG_NOFS);
|
|
if (unlikely(!page)) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (curr == end)
|
|
to = end_offset;
|
|
error = write_empty_blocks(page, from, to);
|
|
if (!error && offset + to > inode->i_size &&
|
|
!(mode & FALLOC_FL_KEEP_SIZE)) {
|
|
i_size_write(inode, offset + to);
|
|
}
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
if (error)
|
|
goto out;
|
|
curr++;
|
|
offset += PAGE_CACHE_SIZE;
|
|
from = 0;
|
|
}
|
|
|
|
gfs2_dinode_out(ip, dibh->b_data);
|
|
mark_inode_dirty(inode);
|
|
|
|
brelse(dibh);
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
|
|
unsigned int *data_blocks, unsigned int *ind_blocks)
|
|
{
|
|
const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
|
|
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;
|
|
}
|
|
/* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
|
|
so it might end up with fewer data blocks */
|
|
if (max_data <= *data_blocks)
|
|
return;
|
|
*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->f_path.dentry->d_inode;
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
|
|
loff_t bytes, max_bytes;
|
|
struct gfs2_alloc *al;
|
|
int error;
|
|
loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
|
|
next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
|
|
|
|
/* We only support the FALLOC_FL_KEEP_SIZE mode */
|
|
if (mode & ~FALLOC_FL_KEEP_SIZE)
|
|
return -EOPNOTSUPP;
|
|
|
|
offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
|
|
sdp->sd_sb.sb_bsize_shift;
|
|
|
|
len = next - offset;
|
|
bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
|
|
if (!bytes)
|
|
bytes = UINT_MAX;
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
|
|
error = gfs2_glock_nq(&ip->i_gh);
|
|
if (unlikely(error))
|
|
goto out_uninit;
|
|
|
|
if (!gfs2_write_alloc_required(ip, offset, len))
|
|
goto out_unlock;
|
|
|
|
while (len > 0) {
|
|
if (len < bytes)
|
|
bytes = len;
|
|
al = gfs2_alloc_get(ip);
|
|
if (!al) {
|
|
error = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
error = gfs2_quota_lock_check(ip);
|
|
if (error)
|
|
goto out_alloc_put;
|
|
|
|
retry:
|
|
gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
|
|
|
|
al->al_requested = data_blocks + ind_blocks;
|
|
error = gfs2_inplace_reserve(ip);
|
|
if (error) {
|
|
if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
|
|
bytes >>= 1;
|
|
goto retry;
|
|
}
|
|
goto out_qunlock;
|
|
}
|
|
max_bytes = bytes;
|
|
calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
|
|
al->al_requested = data_blocks + ind_blocks;
|
|
|
|
rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
|
|
RES_RG_HDR + gfs2_rg_blocks(al);
|
|
if (gfs2_is_jdata(ip))
|
|
rblocks += data_blocks ? data_blocks : 1;
|
|
|
|
error = gfs2_trans_begin(sdp, rblocks,
|
|
PAGE_CACHE_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);
|
|
gfs2_alloc_put(ip);
|
|
}
|
|
goto out_unlock;
|
|
|
|
out_trans_fail:
|
|
gfs2_inplace_release(ip);
|
|
out_qunlock:
|
|
gfs2_quota_unlock(ip);
|
|
out_alloc_put:
|
|
gfs2_alloc_put(ip);
|
|
out_unlock:
|
|
gfs2_glock_dq(&ip->i_gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&ip->i_gh);
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
|
|
|
|
/**
|
|
* gfs2_setlease - acquire/release a file lease
|
|
* @file: the file pointer
|
|
* @arg: lease type
|
|
* @fl: file lock
|
|
*
|
|
* We don't currently have a way to enforce a lease across the whole
|
|
* cluster; until we do, disable leases (by just returning -EINVAL),
|
|
* unless the administrator has requested purely local locking.
|
|
*
|
|
* Locking: called under lock_flocks
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* gfs2_lock - acquire/release a posix lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(&ip->i_inode) && 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)))
|
|
return -EIO;
|
|
if (IS_GETLK(cmd))
|
|
return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
|
|
else
|
|
return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
|
|
}
|
|
|
|
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
|
|
struct gfs2_glock *gl;
|
|
unsigned int state;
|
|
int flags;
|
|
int error = 0;
|
|
|
|
state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
|
|
flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
|
|
gl = fl_gh->gh_gl;
|
|
if (gl) {
|
|
if (fl_gh->gh_state == state)
|
|
goto out;
|
|
flock_lock_file_wait(file,
|
|
&(struct file_lock){.fl_type = F_UNLCK});
|
|
gfs2_glock_dq_wait(fl_gh);
|
|
gfs2_holder_reinit(state, flags, fl_gh);
|
|
} else {
|
|
error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
|
|
&gfs2_flock_glops, CREATE, &gl);
|
|
if (error)
|
|
goto out;
|
|
gfs2_holder_init(gl, state, flags, fl_gh);
|
|
gfs2_glock_put(gl);
|
|
}
|
|
error = gfs2_glock_nq(fl_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(fl_gh);
|
|
if (error == GLR_TRYFAILED)
|
|
error = -EAGAIN;
|
|
} else {
|
|
error = flock_lock_file_wait(file, fl);
|
|
gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&fp->f_fl_mutex);
|
|
return error;
|
|
}
|
|
|
|
static void do_unflock(struct file *file, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
flock_lock_file_wait(file, fl);
|
|
if (fl_gh->gh_gl) {
|
|
gfs2_glock_dq_wait(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 = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = gfs2_file_aio_write,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
.setlease = gfs2_setlease,
|
|
.fallocate = gfs2_fallocate,
|
|
};
|
|
|
|
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,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
|
|
|
|
const struct file_operations gfs2_file_fops_nolock = {
|
|
.llseek = gfs2_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = gfs2_file_aio_write,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
.setlease = generic_setlease,
|
|
.fallocate = gfs2_fallocate,
|
|
};
|
|
|
|
const struct file_operations gfs2_dir_fops_nolock = {
|
|
.readdir = gfs2_readdir,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.llseek = default_llseek,
|
|
};
|
|
|