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exofs: file and file_inode operations
implementation of the file_operations and inode_operations for regular data files. Most file_operations are generic vfs implementations except: - exofs_truncate will truncate the OSD object as well - Generic file_fsync is not good for none_bd devices so open code it - The default for .flush in Linux is todo nothing so call exofs_fsync on the file. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh
parent
b14f8ab284
commit
e806271916
4 changed files with 250 additions and 1 deletions
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@ -12,5 +12,5 @@
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# Kbuild - Gets included from the Kernels Makefile and build system
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#
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exofs-y := osd.o
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exofs-y := osd.o inode.o file.o
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obj-$(CONFIG_EXOFS_FS) += exofs.o
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@ -124,4 +124,18 @@ static inline struct exofs_i_info *exofs_i(struct inode *inode)
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return container_of(inode, struct exofs_i_info, vfs_inode);
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}
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/*************************
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* function declarations *
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*************************/
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/* inode.c */
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void exofs_truncate(struct inode *inode);
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int exofs_setattr(struct dentry *, struct iattr *);
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/*********************
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* operation vectors *
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*********************/
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/* file.c */
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extern const struct inode_operations exofs_file_inode_operations;
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extern const struct file_operations exofs_file_operations;
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#endif
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87
fs/exofs/file.c
Normal file
87
fs/exofs/file.c
Normal file
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@ -0,0 +1,87 @@
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/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
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* Copyright (C) 2005, 2006
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* International Business Machines
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/buffer_head.h>
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#include "exofs.h"
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static int exofs_release_file(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
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int datasync)
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{
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int ret;
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struct address_space *mapping = filp->f_mapping;
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ret = filemap_write_and_wait(mapping);
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if (ret)
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return ret;
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/*Note: file_fsync below also calles sync_blockdev, which is a no-op
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* for exofs, but other then that it does sync_inode and
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* sync_superblock which is what we need here.
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*/
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return file_fsync(filp, dentry, datasync);
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}
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static int exofs_flush(struct file *file, fl_owner_t id)
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{
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exofs_file_fsync(file, file->f_path.dentry, 1);
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/* TODO: Flush the OSD target */
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return 0;
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}
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const struct file_operations exofs_file_operations = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.write = do_sync_write,
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.aio_read = generic_file_aio_read,
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.aio_write = generic_file_aio_write,
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.mmap = generic_file_mmap,
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.open = generic_file_open,
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.release = exofs_release_file,
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.fsync = exofs_file_fsync,
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.flush = exofs_flush,
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.splice_read = generic_file_splice_read,
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.splice_write = generic_file_splice_write,
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};
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const struct inode_operations exofs_file_inode_operations = {
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.truncate = exofs_truncate,
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.setattr = exofs_setattr,
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};
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148
fs/exofs/inode.c
Normal file
148
fs/exofs/inode.c
Normal file
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@ -0,0 +1,148 @@
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/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
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* Copyright (C) 2005, 2006
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* International Business Machines
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/writeback.h>
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#include <linux/buffer_head.h>
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#include "exofs.h"
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#ifdef CONFIG_EXOFS_DEBUG
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# define EXOFS_DEBUG_OBJ_ISIZE 1
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#endif
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/******************************************************************************
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* INODE OPERATIONS
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*****************************************************************************/
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/*
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* Test whether an inode is a fast symlink.
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*/
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static inline int exofs_inode_is_fast_symlink(struct inode *inode)
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{
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struct exofs_i_info *oi = exofs_i(inode);
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return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
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}
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/*
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* get_block_t - Fill in a buffer_head
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* An OSD takes care of block allocation so we just fake an allocation by
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* putting in the inode's sector_t in the buffer_head.
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* TODO: What about the case of create==0 and @iblock does not exist in the
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* object?
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*/
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static int exofs_get_block(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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{
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map_bh(bh_result, inode->i_sb, iblock);
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return 0;
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}
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const struct osd_attr g_attr_logical_length = ATTR_DEF(
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OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
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/*
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* Truncate a file to the specified size - all we have to do is set the size
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* attribute. We make sure the object exists first.
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*/
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void exofs_truncate(struct inode *inode)
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{
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struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
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struct exofs_i_info *oi = exofs_i(inode);
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struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
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struct osd_request *or;
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struct osd_attr attr;
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loff_t isize = i_size_read(inode);
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__be64 newsize;
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int ret;
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
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|| S_ISLNK(inode->i_mode)))
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return;
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if (exofs_inode_is_fast_symlink(inode))
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return;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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return;
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inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
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or = osd_start_request(sbi->s_dev, GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n");
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goto fail;
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}
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osd_req_set_attributes(or, &obj);
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newsize = cpu_to_be64((u64)isize);
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attr = g_attr_logical_length;
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attr.val_ptr = &newsize;
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osd_req_add_set_attr_list(or, &attr, 1);
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/* if we are about to truncate an object, and it hasn't been
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* created yet, wait
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*/
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if (unlikely(wait_obj_created(oi)))
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goto fail;
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ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
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osd_end_request(or);
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if (ret)
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goto fail;
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out:
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mark_inode_dirty(inode);
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return;
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fail:
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make_bad_inode(inode);
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goto out;
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}
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/*
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* Set inode attributes - just call generic functions.
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*/
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int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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error = inode_change_ok(inode, iattr);
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if (error)
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return error;
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error = inode_setattr(inode, iattr);
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return error;
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}
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