![Alan Cox](/assets/img/avatar_default.png)
The early LFS work that Linux uses favours EFBIG in various places. SuSv3 specifically uses EOVERFLOW for this as noted by Michael (Bug 7253) [EOVERFLOW] The named file is a regular file and the size of the file cannot be represented correctly in an object of type off_t. We should therefore transition to the proper error return code Signed-off-by: Alan Cox <alan@redhat.com> Cc: Theodore Tso <tytso@mit.edu> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
681 lines
16 KiB
C
681 lines
16 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/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/ext2_fs.h>
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#include <linux/crc32.h>
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#include <linux/lm_interface.h>
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#include <linux/writeback.h>
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#include <asm/uaccess.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 "lm.h"
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#include "log.h"
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#include "meta_io.h"
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#include "ops_file.h"
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#include "ops_vm.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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#include "eaops.h"
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/*
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* Most fields left uninitialised to catch anybody who tries to
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* use them. f_flags set to prevent file_accessed() from touching
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* any other part of this. Its use is purely as a flag so that we
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* know (in readpage()) whether or not do to locking.
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*/
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struct file gfs2_internal_file_sentinel = {
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.f_flags = O_NOATIME|O_RDONLY,
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};
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static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
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unsigned long offset, unsigned long size)
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{
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char *kaddr;
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unsigned long count = desc->count;
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if (size > count)
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size = count;
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kaddr = kmap(page);
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memcpy(desc->arg.data, kaddr + offset, size);
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kunmap(page);
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desc->count = count - size;
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desc->written += size;
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desc->arg.buf += size;
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return size;
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}
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int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
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char *buf, loff_t *pos, unsigned size)
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{
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struct inode *inode = &ip->i_inode;
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read_descriptor_t desc;
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desc.written = 0;
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desc.arg.data = buf;
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desc.count = size;
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desc.error = 0;
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do_generic_mapping_read(inode->i_mapping, ra_state,
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&gfs2_internal_file_sentinel, pos, &desc,
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gfs2_read_actor);
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return desc.written ? desc.written : desc.error;
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}
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/**
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* gfs2_llseek - seek to a location in a file
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* @file: the file
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* @offset: the offset
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* @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
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*
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* SEEK_END requires the glock for the file because it references the
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* file's size.
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*
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* Returns: The new offset, or errno
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*/
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static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
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{
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struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
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struct gfs2_holder i_gh;
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loff_t error;
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if (origin == 2) {
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
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&i_gh);
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if (!error) {
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error = remote_llseek(file, offset, origin);
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gfs2_glock_dq_uninit(&i_gh);
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}
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} else
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error = remote_llseek(file, offset, origin);
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return error;
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}
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/**
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* 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, GL_ATIME, &d_gh);
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error = gfs2_glock_nq_atime(&d_gh);
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if (error) {
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gfs2_holder_uninit(&d_gh);
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return error;
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}
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error = gfs2_dir_read(dir, &offset, 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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[20] = GFS2_DIF_INHERIT_DIRECTIO,
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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_InheritDirectio] = FS_DIRECTIO_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, GL_ATIME, &gh);
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error = gfs2_glock_nq_atime(&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_di.di_flags);
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if (!S_ISDIR(inode->i_mode)) {
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if (ip->i_di.di_flags & GFS2_DIF_JDATA)
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fsflags |= FS_JOURNAL_DATA_FL;
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if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
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fsflags |= FS_DIRECTIO_FL;
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}
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if (put_user(fsflags, ptr))
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error = -EFAULT;
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gfs2_glock_dq_m(1, &gh);
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gfs2_holder_uninit(&gh);
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return error;
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}
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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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struct gfs2_dinode_host *di = &ip->i_di;
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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 (di->di_flags & GFS2_DIF_IMMUTABLE)
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flags |= S_IMMUTABLE;
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if (di->di_flags & GFS2_DIF_APPENDONLY)
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flags |= S_APPEND;
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if (di->di_flags & GFS2_DIF_NOATIME)
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flags |= S_NOATIME;
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if (di->di_flags & 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_DIRECTIO| \
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GFS2_DIF_IMMUTABLE| \
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GFS2_DIF_APPENDONLY| \
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GFS2_DIF_NOATIME| \
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GFS2_DIF_SYNC| \
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GFS2_DIF_SYSTEM| \
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GFS2_DIF_INHERIT_DIRECTIO| \
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GFS2_DIF_INHERIT_JDATA)
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/**
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* gfs2_set_flags - set flags on an inode
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* @inode: The inode
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* @flags: The flags to set
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* @mask: Indicates which flags are valid
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*
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*/
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static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
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{
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struct inode *inode = filp->f_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 = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
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if (error)
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return error;
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flags = ip->i_di.di_flags;
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new_flags = (flags & ~mask) | (reqflags & mask);
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if ((new_flags ^ flags) == 0)
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goto out;
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error = -EINVAL;
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if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
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goto out;
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error = -EPERM;
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if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
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goto out;
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if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
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goto out;
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if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
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!capable(CAP_LINUX_IMMUTABLE))
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goto out;
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if (!IS_IMMUTABLE(inode)) {
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error = permission(inode, MAY_WRITE, NULL);
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if (error)
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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_di.di_flags = 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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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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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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if (gfsflags & GFS2_DIF_INHERIT_DIRECTIO)
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gfsflags ^= (GFS2_DIF_DIRECTIO | GFS2_DIF_INHERIT_DIRECTIO);
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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_mmap -
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* @file: The file to map
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* @vma: The VMA which described the mapping
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*
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* Returns: 0 or error code
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*/
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static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
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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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int error;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
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error = gfs2_glock_nq_atime(&i_gh);
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if (error) {
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gfs2_holder_uninit(&i_gh);
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return error;
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}
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/* This is VM_MAYWRITE instead of VM_WRITE because a call
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to mprotect() can turn on VM_WRITE later. */
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if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
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(VM_MAYSHARE | VM_MAYWRITE))
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vma->vm_ops = &gfs2_vm_ops_sharewrite;
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else
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vma->vm_ops = &gfs2_vm_ops_private;
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gfs2_glock_dq_uninit(&i_gh);
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return error;
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}
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/**
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* gfs2_open - open a file
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* @inode: the inode to open
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* @file: the struct file for this opening
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*
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* Returns: errno
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*/
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static int gfs2_open(struct inode *inode, struct file *file)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder i_gh;
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struct gfs2_file *fp;
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int error;
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fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
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if (!fp)
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return -ENOMEM;
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mutex_init(&fp->f_fl_mutex);
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gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
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file->private_data = fp;
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if (S_ISREG(ip->i_inode.i_mode)) {
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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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goto fail;
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if (!(file->f_flags & O_LARGEFILE) &&
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ip->i_di.di_size > MAX_NON_LFS) {
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error = -EOVERFLOW;
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goto fail_gunlock;
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}
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/* Listen to the Direct I/O flag */
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if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
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file->f_flags |= O_DIRECT;
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gfs2_glock_dq_uninit(&i_gh);
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}
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return 0;
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fail_gunlock:
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gfs2_glock_dq_uninit(&i_gh);
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fail:
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file->private_data = NULL;
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kfree(fp);
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return error;
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}
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/**
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* gfs2_close - called to close a struct file
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* @inode: the inode the struct file belongs to
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* @file: the struct file being closed
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*
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* Returns: errno
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*/
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static int gfs2_close(struct inode *inode, struct file *file)
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{
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struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
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struct gfs2_file *fp;
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fp = file->private_data;
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file->private_data = NULL;
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if (gfs2_assert_warn(sdp, fp))
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return -EIO;
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kfree(fp);
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return 0;
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}
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/**
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* gfs2_fsync - sync the dirty data for a file (across the cluster)
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* @file: the file that points to the dentry (we ignore this)
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* @dentry: the dentry that points to the inode to sync
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*
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* The VFS will flush "normal" data for us. We only need to worry
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* about metadata here. For journaled data, we just do a log flush
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* as we can't avoid it. Otherwise we can just bale out if datasync
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* is set. For stuffed inodes we must flush the log in order to
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* ensure that all data is on disk.
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*
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* The call to write_inode_now() is there to write back metadata and
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* the inode itself. It does also try and write the data, but thats
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* (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
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* for us.
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*
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* Returns: errno
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*/
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static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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struct inode *inode = dentry->d_inode;
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int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
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int ret = 0;
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|
|
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_setlease - acquire/release a file lease
|
|
* @file: the file pointer
|
|
* @arg: lease type
|
|
* @fl: file lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (!sdp->sd_args.ar_localflocks)
|
|
return -EINVAL;
|
|
return generic_setlease(file, arg, fl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_lock - acquire/release a posix lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
struct lm_lockname name =
|
|
{ .ln_number = ip->i_no_addr,
|
|
.ln_type = LM_TYPE_PLOCK };
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(&ip->i_inode))
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks) {
|
|
if (IS_GETLK(cmd)) {
|
|
posix_test_lock(file, fl);
|
|
return 0;
|
|
} else {
|
|
return posix_lock_file_wait(file, fl);
|
|
}
|
|
}
|
|
|
|
if (cmd == F_CANCELLK) {
|
|
/* Hack: */
|
|
cmd = F_SETLK;
|
|
fl->fl_type = F_UNLCK;
|
|
}
|
|
if (IS_GETLK(cmd))
|
|
return gfs2_lm_plock_get(sdp, &name, file, fl);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
return gfs2_lm_punlock(sdp, &name, file, fl);
|
|
else
|
|
return gfs2_lm_plock(sdp, &name, file, cmd, fl);
|
|
}
|
|
|
|
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
struct gfs2_inode *ip = GFS2_I(file->f_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
|
|
| GL_FLOCK;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
|
|
gl = fl_gh->gh_gl;
|
|
if (gl) {
|
|
if (fl_gh->gh_state == state)
|
|
goto out;
|
|
flock_lock_file_wait(file,
|
|
&(struct file_lock){.fl_type = F_UNLCK});
|
|
gfs2_glock_dq_wait(fl_gh);
|
|
gfs2_holder_reinit(state, flags, fl_gh);
|
|
} else {
|
|
error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
|
|
ip->i_no_addr, &gfs2_flock_glops,
|
|
CREATE, &gl);
|
|
if (error)
|
|
goto out;
|
|
gfs2_holder_init(gl, state, flags, fl_gh);
|
|
gfs2_glock_put(gl);
|
|
}
|
|
error = gfs2_glock_nq(fl_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(fl_gh);
|
|
if (error == GLR_TRYFAILED)
|
|
error = -EAGAIN;
|
|
} else {
|
|
error = flock_lock_file_wait(file, fl);
|
|
gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&fp->f_fl_mutex);
|
|
return error;
|
|
}
|
|
|
|
static void do_unflock(struct file *file, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
flock_lock_file_wait(file, fl);
|
|
if (fl_gh->gh_gl)
|
|
gfs2_glock_dq_uninit(fl_gh);
|
|
mutex_unlock(&fp->f_fl_mutex);
|
|
}
|
|
|
|
/**
|
|
* gfs2_flock - acquire/release a flock lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(&ip->i_inode))
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks)
|
|
return flock_lock_file_wait(file, fl);
|
|
|
|
if (fl->fl_type == F_UNLCK) {
|
|
do_unflock(file, fl);
|
|
return 0;
|
|
} else {
|
|
return do_flock(file, cmd, fl);
|
|
}
|
|
}
|
|
|
|
const struct file_operations gfs2_file_fops = {
|
|
.llseek = gfs2_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = generic_file_aio_write,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
.setlease = gfs2_setlease,
|
|
};
|
|
|
|
const struct file_operations gfs2_dir_fops = {
|
|
.readdir = gfs2_readdir,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
};
|
|
|