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1606 lines
40 KiB
1606 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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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|
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/compat.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 <linux/backing-dev.h> |
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#include <linux/fileattr.h> |
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|
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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 "aops.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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/** |
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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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|
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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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|
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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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|
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return error; |
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} |
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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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|
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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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|
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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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|
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error = gfs2_dir_read(dir, ctx, &file->f_ra); |
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|
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gfs2_glock_dq_uninit(&d_gh); |
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|
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return error; |
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} |
|
|
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/* |
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* struct 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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|
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static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags) |
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{ |
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int i; |
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u32 fsflags = 0; |
|
|
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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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|
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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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return fsflags; |
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} |
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|
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int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa) |
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{ |
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struct inode *inode = d_inode(dentry); |
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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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if (d_is_special(dentry)) |
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return -ENOTTY; |
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|
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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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fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); |
|
|
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fileattr_fill_flags(fa, fsflags); |
|
|
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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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/** |
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* do_gfs2_set_flags - set flags on an inode |
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* @inode: The inode |
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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 inode *inode, u32 reqflags, u32 mask) |
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{ |
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struct gfs2_inode *ip = GFS2_I(inode); |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
struct buffer_head *bh; |
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struct gfs2_holder gh; |
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int error; |
|
u32 new_flags, flags; |
|
|
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
|
if (error) |
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return error; |
|
|
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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; |
|
|
|
if (!IS_IMMUTABLE(inode)) { |
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error = gfs2_permission(&init_user_ns, inode, MAY_WRITE); |
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if (error) |
|
goto out; |
|
} |
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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, |
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GFS2_LOG_HEAD_FLUSH_NORMAL | |
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GFS2_LFC_SET_FLAGS); |
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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; |
|
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); |
|
out_trans_end: |
|
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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int gfs2_fileattr_set(struct user_namespace *mnt_userns, |
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struct dentry *dentry, struct fileattr *fa) |
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{ |
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struct inode *inode = d_inode(dentry); |
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u32 fsflags = fa->flags, gfsflags = 0; |
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u32 mask; |
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int i; |
|
|
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if (d_is_special(dentry)) |
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return -ENOTTY; |
|
|
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if (fileattr_has_fsx(fa)) |
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return -EOPNOTSUPP; |
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|
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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(inode, gfsflags, mask); |
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} |
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|
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static int gfs2_getlabel(struct file *filp, char __user *label) |
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{ |
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struct inode *inode = file_inode(filp); |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
|
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if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN)) |
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return -EFAULT; |
|
|
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return 0; |
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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 FITRIM: |
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return gfs2_fitrim(filp, (void __user *)arg); |
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case FS_IOC_GETFSLABEL: |
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return gfs2_getlabel(filp, (char __user *)arg); |
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} |
|
|
|
return -ENOTTY; |
|
} |
|
|
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#ifdef CONFIG_COMPAT |
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static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
|
{ |
|
switch(cmd) { |
|
/* Keep this list in sync with gfs2_ioctl */ |
|
case FITRIM: |
|
case FS_IOC_GETFSLABEL: |
|
break; |
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); |
|
} |
|
#else |
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#define gfs2_compat_ioctl NULL |
|
#endif |
|
|
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/** |
|
* gfs2_size_hint - Give a hint to the size of a write request |
|
* @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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static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) |
|
{ |
|
struct inode *inode = file_inode(filep); |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
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; |
|
int hint = min_t(size_t, INT_MAX, blks); |
|
|
|
if (hint > atomic_read(&ip->i_sizehint)) |
|
atomic_set(&ip->i_sizehint, hint); |
|
} |
|
|
|
/** |
|
* gfs2_allocate_page_backing - Allocate blocks for a write fault |
|
* @page: The (locked) page to allocate backing for |
|
* @length: Size of the allocation |
|
* |
|
* We try to allocate all the blocks required for the page in one go. This |
|
* might fail for various reasons, so we keep trying until all the blocks to |
|
* back this page are allocated. If some of the blocks are already allocated, |
|
* that is ok too. |
|
*/ |
|
static int gfs2_allocate_page_backing(struct page *page, unsigned int length) |
|
{ |
|
u64 pos = page_offset(page); |
|
|
|
do { |
|
struct iomap iomap = { }; |
|
|
|
if (gfs2_iomap_alloc(page->mapping->host, pos, length, &iomap)) |
|
return -EIO; |
|
|
|
if (length < iomap.length) |
|
iomap.length = length; |
|
length -= iomap.length; |
|
pos += iomap.length; |
|
} while (length > 0); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* gfs2_page_mkwrite - Make a shared, mmap()ed, page writable |
|
* @vmf: The virtual memory fault containing the page to become writable |
|
* |
|
* When the page becomes writable, we need to ensure that we have |
|
* blocks allocated on disk to back that page. |
|
*/ |
|
|
|
static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf) |
|
{ |
|
struct page *page = vmf->page; |
|
struct inode *inode = file_inode(vmf->vma->vm_file); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
struct gfs2_alloc_parms ap = { .aflags = 0, }; |
|
u64 offset = page_offset(page); |
|
unsigned int data_blocks, ind_blocks, rblocks; |
|
vm_fault_t ret = VM_FAULT_LOCKED; |
|
struct gfs2_holder gh; |
|
unsigned int length; |
|
loff_t size; |
|
int err; |
|
|
|
sb_start_pagefault(inode->i_sb); |
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
|
err = gfs2_glock_nq(&gh); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_uninit; |
|
} |
|
|
|
/* Check page index against inode size */ |
|
size = i_size_read(inode); |
|
if (offset >= size) { |
|
ret = VM_FAULT_SIGBUS; |
|
goto out_unlock; |
|
} |
|
|
|
/* Update file times before taking page lock */ |
|
file_update_time(vmf->vma->vm_file); |
|
|
|
/* page is wholly or partially inside EOF */ |
|
if (size - offset < PAGE_SIZE) |
|
length = size - offset; |
|
else |
|
length = PAGE_SIZE; |
|
|
|
gfs2_size_hint(vmf->vma->vm_file, offset, length); |
|
|
|
set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
|
set_bit(GIF_SW_PAGED, &ip->i_flags); |
|
|
|
/* |
|
* iomap_writepage / iomap_writepages currently don't support inline |
|
* files, so always unstuff here. |
|
*/ |
|
|
|
if (!gfs2_is_stuffed(ip) && |
|
!gfs2_write_alloc_required(ip, offset, length)) { |
|
lock_page(page); |
|
if (!PageUptodate(page) || page->mapping != inode->i_mapping) { |
|
ret = VM_FAULT_NOPAGE; |
|
unlock_page(page); |
|
} |
|
goto out_unlock; |
|
} |
|
|
|
err = gfs2_rindex_update(sdp); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_unlock; |
|
} |
|
|
|
gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks); |
|
ap.target = data_blocks + ind_blocks; |
|
err = gfs2_quota_lock_check(ip, &ap); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_unlock; |
|
} |
|
err = gfs2_inplace_reserve(ip, &ap); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_quota_unlock; |
|
} |
|
|
|
rblocks = RES_DINODE + ind_blocks; |
|
if (gfs2_is_jdata(ip)) |
|
rblocks += data_blocks ? data_blocks : 1; |
|
if (ind_blocks || data_blocks) { |
|
rblocks += RES_STATFS + RES_QUOTA; |
|
rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
|
} |
|
err = gfs2_trans_begin(sdp, rblocks, 0); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_trans_fail; |
|
} |
|
|
|
/* Unstuff, if required, and allocate backing blocks for page */ |
|
if (gfs2_is_stuffed(ip)) { |
|
err = gfs2_unstuff_dinode(ip); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_trans_end; |
|
} |
|
} |
|
|
|
lock_page(page); |
|
/* If truncated, we must retry the operation, we may have raced |
|
* with the glock demotion code. |
|
*/ |
|
if (!PageUptodate(page) || page->mapping != inode->i_mapping) { |
|
ret = VM_FAULT_NOPAGE; |
|
goto out_page_locked; |
|
} |
|
|
|
err = gfs2_allocate_page_backing(page, length); |
|
if (err) |
|
ret = block_page_mkwrite_return(err); |
|
|
|
out_page_locked: |
|
if (ret != VM_FAULT_LOCKED) |
|
unlock_page(page); |
|
out_trans_end: |
|
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 == VM_FAULT_LOCKED) { |
|
set_page_dirty(page); |
|
wait_for_stable_page(page); |
|
} |
|
sb_end_pagefault(inode->i_sb); |
|
return ret; |
|
} |
|
|
|
static vm_fault_t gfs2_fault(struct vm_fault *vmf) |
|
{ |
|
struct inode *inode = file_inode(vmf->vma->vm_file); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
vm_fault_t ret; |
|
int err; |
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
err = gfs2_glock_nq(&gh); |
|
if (err) { |
|
ret = block_page_mkwrite_return(err); |
|
goto out_uninit; |
|
} |
|
ret = filemap_fault(vmf); |
|
gfs2_glock_dq(&gh); |
|
out_uninit: |
|
gfs2_holder_uninit(&gh); |
|
return ret; |
|
} |
|
|
|
static const struct vm_operations_struct gfs2_vm_ops = { |
|
.fault = gfs2_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; |
|
if (file->f_mode & FMODE_WRITE) { |
|
ret = gfs2_qa_get(GFS2_I(inode)); |
|
if (ret) |
|
goto fail; |
|
} |
|
return 0; |
|
|
|
fail: |
|
kfree(file->private_data); |
|
file->private_data = NULL; |
|
return ret; |
|
} |
|
|
|
/** |
|
* 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) { |
|
if (gfs2_rs_active(&ip->i_res)) |
|
gfs2_rs_delete(ip); |
|
gfs2_qa_put(ip); |
|
} |
|
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; |
|
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; |
|
|
|
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; |
|
} |
|
|
|
static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i, |
|
size_t *prev_count, |
|
size_t *window_size) |
|
{ |
|
size_t count = iov_iter_count(i); |
|
size_t size, offs; |
|
|
|
if (likely(!count)) |
|
return false; |
|
if (ret <= 0 && ret != -EFAULT) |
|
return false; |
|
if (!iter_is_iovec(i)) |
|
return false; |
|
|
|
size = PAGE_SIZE; |
|
offs = offset_in_page(i->iov[0].iov_base + i->iov_offset); |
|
if (*prev_count != count || !*window_size) { |
|
size_t nr_dirtied; |
|
|
|
size = ALIGN(offs + count, PAGE_SIZE); |
|
size = min_t(size_t, size, SZ_1M); |
|
nr_dirtied = max(current->nr_dirtied_pause - |
|
current->nr_dirtied, 8); |
|
size = min(size, nr_dirtied << PAGE_SHIFT); |
|
} |
|
|
|
*prev_count = count; |
|
*window_size = size - offs; |
|
return true; |
|
} |
|
|
|
static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to, |
|
struct gfs2_holder *gh) |
|
{ |
|
struct file *file = iocb->ki_filp; |
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
|
size_t prev_count = 0, window_size = 0; |
|
size_t written = 0; |
|
ssize_t ret; |
|
|
|
/* |
|
* In this function, we disable page faults when we're holding the |
|
* inode glock while doing I/O. If a page fault occurs, we indicate |
|
* that the inode glock may be dropped, fault in the pages manually, |
|
* and retry. |
|
* |
|
* Unlike generic_file_read_iter, for reads, iomap_dio_rw can trigger |
|
* physical as well as manual page faults, and we need to disable both |
|
* kinds. |
|
* |
|
* For direct I/O, gfs2 takes the inode glock in deferred mode. This |
|
* locking mode is compatible with other deferred holders, so multiple |
|
* processes and nodes can do direct I/O to a file at the same time. |
|
* There's no guarantee that reads or writes will be atomic. Any |
|
* coordination among readers and writers needs to happen externally. |
|
*/ |
|
|
|
if (!iov_iter_count(to)) |
|
return 0; /* skip atime */ |
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh); |
|
retry: |
|
ret = gfs2_glock_nq(gh); |
|
if (ret) |
|
goto out_uninit; |
|
retry_under_glock: |
|
pagefault_disable(); |
|
to->nofault = true; |
|
ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, |
|
IOMAP_DIO_PARTIAL, written); |
|
to->nofault = false; |
|
pagefault_enable(); |
|
if (ret > 0) |
|
written = ret; |
|
|
|
if (should_fault_in_pages(ret, to, &prev_count, &window_size)) { |
|
size_t leftover; |
|
|
|
gfs2_holder_allow_demote(gh); |
|
leftover = fault_in_iov_iter_writeable(to, window_size); |
|
gfs2_holder_disallow_demote(gh); |
|
if (leftover != window_size) { |
|
if (gfs2_holder_queued(gh)) |
|
goto retry_under_glock; |
|
goto retry; |
|
} |
|
} |
|
if (gfs2_holder_queued(gh)) |
|
gfs2_glock_dq(gh); |
|
out_uninit: |
|
gfs2_holder_uninit(gh); |
|
if (ret < 0) |
|
return ret; |
|
return written; |
|
} |
|
|
|
static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from, |
|
struct gfs2_holder *gh) |
|
{ |
|
struct file *file = iocb->ki_filp; |
|
struct inode *inode = file->f_mapping->host; |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
size_t prev_count = 0, window_size = 0; |
|
size_t read = 0; |
|
ssize_t ret; |
|
|
|
/* |
|
* In this function, we disable page faults when we're holding the |
|
* inode glock while doing I/O. If a page fault occurs, we indicate |
|
* that the inode glock may be dropped, fault in the pages manually, |
|
* and retry. |
|
* |
|
* For writes, iomap_dio_rw only triggers manual page faults, so we |
|
* don't need to disable physical ones. |
|
*/ |
|
|
|
/* |
|
* Deferred lock, even if its a write, since we do no allocation on |
|
* this path. All we need to change is the atime, and this lock mode |
|
* ensures that other nodes have flushed their buffered read caches |
|
* (i.e. their page cache entries for this inode). We do not, |
|
* unfortunately, have the option of only flushing a range like the |
|
* VFS does. |
|
*/ |
|
gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh); |
|
retry: |
|
ret = gfs2_glock_nq(gh); |
|
if (ret) |
|
goto out_uninit; |
|
/* Silently fall back to buffered I/O when writing beyond EOF */ |
|
if (iocb->ki_pos + iov_iter_count(from) > i_size_read(&ip->i_inode)) |
|
goto out; |
|
retry_under_glock: |
|
|
|
from->nofault = true; |
|
ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, |
|
IOMAP_DIO_PARTIAL, read); |
|
from->nofault = false; |
|
|
|
if (ret == -ENOTBLK) |
|
ret = 0; |
|
if (ret > 0) |
|
read = ret; |
|
|
|
if (should_fault_in_pages(ret, from, &prev_count, &window_size)) { |
|
size_t leftover; |
|
|
|
gfs2_holder_allow_demote(gh); |
|
leftover = fault_in_iov_iter_readable(from, window_size); |
|
gfs2_holder_disallow_demote(gh); |
|
if (leftover != window_size) { |
|
if (gfs2_holder_queued(gh)) |
|
goto retry_under_glock; |
|
goto retry; |
|
} |
|
} |
|
out: |
|
if (gfs2_holder_queued(gh)) |
|
gfs2_glock_dq(gh); |
|
out_uninit: |
|
gfs2_holder_uninit(gh); |
|
if (ret < 0) |
|
return ret; |
|
return read; |
|
} |
|
|
|
static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
|
{ |
|
struct gfs2_inode *ip; |
|
struct gfs2_holder gh; |
|
size_t prev_count = 0, window_size = 0; |
|
size_t written = 0; |
|
ssize_t ret; |
|
|
|
/* |
|
* In this function, we disable page faults when we're holding the |
|
* inode glock while doing I/O. If a page fault occurs, we indicate |
|
* that the inode glock may be dropped, fault in the pages manually, |
|
* and retry. |
|
*/ |
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) |
|
return gfs2_file_direct_read(iocb, to, &gh); |
|
|
|
pagefault_disable(); |
|
iocb->ki_flags |= IOCB_NOIO; |
|
ret = generic_file_read_iter(iocb, to); |
|
iocb->ki_flags &= ~IOCB_NOIO; |
|
pagefault_enable(); |
|
if (ret >= 0) { |
|
if (!iov_iter_count(to)) |
|
return ret; |
|
written = ret; |
|
} else if (ret != -EFAULT) { |
|
if (ret != -EAGAIN) |
|
return ret; |
|
if (iocb->ki_flags & IOCB_NOWAIT) |
|
return ret; |
|
} |
|
ip = GFS2_I(iocb->ki_filp->f_mapping->host); |
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
retry: |
|
ret = gfs2_glock_nq(&gh); |
|
if (ret) |
|
goto out_uninit; |
|
retry_under_glock: |
|
pagefault_disable(); |
|
ret = generic_file_read_iter(iocb, to); |
|
pagefault_enable(); |
|
if (ret > 0) |
|
written += ret; |
|
|
|
if (should_fault_in_pages(ret, to, &prev_count, &window_size)) { |
|
size_t leftover; |
|
|
|
gfs2_holder_allow_demote(&gh); |
|
leftover = fault_in_iov_iter_writeable(to, window_size); |
|
gfs2_holder_disallow_demote(&gh); |
|
if (leftover != window_size) { |
|
if (gfs2_holder_queued(&gh)) |
|
goto retry_under_glock; |
|
goto retry; |
|
} |
|
} |
|
if (gfs2_holder_queued(&gh)) |
|
gfs2_glock_dq(&gh); |
|
out_uninit: |
|
gfs2_holder_uninit(&gh); |
|
return written ? written : ret; |
|
} |
|
|
|
static ssize_t gfs2_file_buffered_write(struct kiocb *iocb, |
|
struct iov_iter *from, |
|
struct gfs2_holder *gh) |
|
{ |
|
struct file *file = iocb->ki_filp; |
|
struct inode *inode = file_inode(file); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
struct gfs2_holder *statfs_gh = NULL; |
|
size_t prev_count = 0, window_size = 0; |
|
size_t orig_count = iov_iter_count(from); |
|
size_t read = 0; |
|
ssize_t ret; |
|
|
|
/* |
|
* In this function, we disable page faults when we're holding the |
|
* inode glock while doing I/O. If a page fault occurs, we indicate |
|
* that the inode glock may be dropped, fault in the pages manually, |
|
* and retry. |
|
*/ |
|
|
|
if (inode == sdp->sd_rindex) { |
|
statfs_gh = kmalloc(sizeof(*statfs_gh), GFP_NOFS); |
|
if (!statfs_gh) |
|
return -ENOMEM; |
|
} |
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, gh); |
|
retry: |
|
ret = gfs2_glock_nq(gh); |
|
if (ret) |
|
goto out_uninit; |
|
retry_under_glock: |
|
if (inode == sdp->sd_rindex) { |
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
|
|
|
ret = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, |
|
GL_NOCACHE, statfs_gh); |
|
if (ret) |
|
goto out_unlock; |
|
} |
|
|
|
current->backing_dev_info = inode_to_bdi(inode); |
|
pagefault_disable(); |
|
ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); |
|
pagefault_enable(); |
|
current->backing_dev_info = NULL; |
|
if (ret > 0) { |
|
iocb->ki_pos += ret; |
|
read += ret; |
|
} |
|
|
|
if (inode == sdp->sd_rindex) |
|
gfs2_glock_dq_uninit(statfs_gh); |
|
|
|
from->count = orig_count - read; |
|
if (should_fault_in_pages(ret, from, &prev_count, &window_size)) { |
|
size_t leftover; |
|
|
|
gfs2_holder_allow_demote(gh); |
|
leftover = fault_in_iov_iter_readable(from, window_size); |
|
gfs2_holder_disallow_demote(gh); |
|
if (leftover != window_size) { |
|
from->count = min(from->count, window_size - leftover); |
|
if (gfs2_holder_queued(gh)) |
|
goto retry_under_glock; |
|
goto retry; |
|
} |
|
} |
|
out_unlock: |
|
if (gfs2_holder_queued(gh)) |
|
gfs2_glock_dq(gh); |
|
out_uninit: |
|
gfs2_holder_uninit(gh); |
|
if (statfs_gh) |
|
kfree(statfs_gh); |
|
from->count = orig_count - read; |
|
return read ? read : ret; |
|
} |
|
|
|
/** |
|
* gfs2_file_write_iter - Perform a write to a file |
|
* @iocb: The io context |
|
* @from: The data to write |
|
* |
|
* 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 inode *inode = file_inode(file); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
ssize_t ret; |
|
|
|
gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from)); |
|
|
|
if (iocb->ki_flags & IOCB_APPEND) { |
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
if (ret) |
|
return ret; |
|
gfs2_glock_dq_uninit(&gh); |
|
} |
|
|
|
inode_lock(inode); |
|
ret = generic_write_checks(iocb, from); |
|
if (ret <= 0) |
|
goto out_unlock; |
|
|
|
ret = file_remove_privs(file); |
|
if (ret) |
|
goto out_unlock; |
|
|
|
ret = file_update_time(file); |
|
if (ret) |
|
goto out_unlock; |
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) { |
|
struct address_space *mapping = file->f_mapping; |
|
ssize_t buffered, ret2; |
|
|
|
ret = gfs2_file_direct_write(iocb, from, &gh); |
|
if (ret < 0 || !iov_iter_count(from)) |
|
goto out_unlock; |
|
|
|
iocb->ki_flags |= IOCB_DSYNC; |
|
buffered = gfs2_file_buffered_write(iocb, from, &gh); |
|
if (unlikely(buffered <= 0)) { |
|
if (!ret) |
|
ret = buffered; |
|
goto out_unlock; |
|
} |
|
|
|
/* |
|
* We need to ensure that the page cache pages are written to |
|
* disk and invalidated to preserve the expected O_DIRECT |
|
* semantics. If the writeback or invalidate fails, only report |
|
* the direct I/O range as we don't know if the buffered pages |
|
* made it to disk. |
|
*/ |
|
ret2 = generic_write_sync(iocb, buffered); |
|
invalidate_mapping_pages(mapping, |
|
(iocb->ki_pos - buffered) >> PAGE_SHIFT, |
|
(iocb->ki_pos - 1) >> PAGE_SHIFT); |
|
if (!ret || ret2 > 0) |
|
ret += ret2; |
|
} else { |
|
ret = gfs2_file_buffered_write(iocb, from, &gh); |
|
if (likely(ret > 0)) |
|
ret = generic_write_sync(iocb, ret); |
|
} |
|
|
|
out_unlock: |
|
inode_unlock(inode); |
|
return ret; |
|
} |
|
|
|
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, |
|
int mode) |
|
{ |
|
struct super_block *sb = inode->i_sb; |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
loff_t end = offset + len; |
|
struct buffer_head *dibh; |
|
int error; |
|
|
|
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); |
|
if (unlikely(error)) |
|
goto out; |
|
} |
|
|
|
while (offset < end) { |
|
struct iomap iomap = { }; |
|
|
|
error = gfs2_iomap_alloc(inode, offset, end - offset, &iomap); |
|
if (error) |
|
goto out; |
|
offset = iomap.offset + iomap.length; |
|
if (!(iomap.flags & IOMAP_F_NEW)) |
|
continue; |
|
error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits, |
|
iomap.length >> inode->i_blkbits, |
|
GFP_NOFS); |
|
if (error) { |
|
fs_err(GFS2_SB(inode), "Failed to zero data buffers\n"); |
|
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; |
|
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 */ |
|
max_blks = UINT_MAX; |
|
if (ap.allowed) |
|
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 (ip->i_res.rs_reserved < max_blks) |
|
max_blks = ip->i_res.rs_reserved; |
|
|
|
/* 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 >> inode->i_blkbits); |
|
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_PUNCH_HOLE | 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; |
|
|
|
if (mode & FALLOC_FL_PUNCH_HOLE) { |
|
ret = __gfs2_punch_hole(file, offset, len); |
|
} else { |
|
ret = __gfs2_fallocate(file, mode, offset, len); |
|
if (ret) |
|
gfs2_rs_deltree(&ip->i_res); |
|
} |
|
|
|
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) |
|
{ |
|
ssize_t ret; |
|
|
|
gfs2_size_hint(out, *ppos, len); |
|
|
|
ret = iter_file_splice_write(pipe, out, ppos, len, flags); |
|
return ret; |
|
} |
|
|
|
#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 (cmd == F_CANCELLK) { |
|
/* Hack: */ |
|
cmd = F_SETLK; |
|
fl->fl_type = F_UNLCK; |
|
} |
|
if (unlikely(gfs2_withdrawn(sdp))) { |
|
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)) { |
|
struct file_lock request; |
|
if (fl_gh->gh_state == state) |
|
goto out; |
|
locks_init_lock(&request); |
|
request.fl_type = F_UNLCK; |
|
request.fl_flags = FL_FLOCK; |
|
locks_lock_file_wait(file, &request); |
|
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; |
|
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 == 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 = gfs2_file_read_iter, |
|
.write_iter = gfs2_file_write_iter, |
|
.iopoll = iocb_bio_iopoll, |
|
.unlocked_ioctl = gfs2_ioctl, |
|
.compat_ioctl = gfs2_compat_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, |
|
.compat_ioctl = gfs2_compat_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 = gfs2_file_read_iter, |
|
.write_iter = gfs2_file_write_iter, |
|
.iopoll = iocb_bio_iopoll, |
|
.unlocked_ioctl = gfs2_ioctl, |
|
.compat_ioctl = gfs2_compat_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, |
|
.compat_ioctl = gfs2_compat_ioctl, |
|
.open = gfs2_open, |
|
.release = gfs2_release, |
|
.fsync = gfs2_fsync, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
|