Replace inode_setattr with opencoded variants of it in all callers. This moves the remaining call to vmtruncate into the filesystem methods where it can be replaced with the proper truncate sequence. In a few cases it was obvious that we would never end up calling vmtruncate so it was left out in the opencoded variant: spufs: explicitly checks for ATTR_SIZE earlier btrfs,hugetlbfs,logfs,dlmfs: explicitly clears ATTR_SIZE earlier ufs: contains an opencoded simple_seattr + truncate that sets the filesize just above In addition to that ncpfs called inode_setattr with handcrafted iattrs, which allowed to trim down the opencoded variant. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
/*
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* file.c
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*
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* PURPOSE
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* File handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-1999 Dave Boynton
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* (C) 1998-2004 Ben Fennema
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* (C) 1999-2000 Stelias Computing Inc
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*
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* HISTORY
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*
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* 10/02/98 dgb Attempt to integrate into udf.o
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* 10/07/98 Switched to using generic_readpage, etc., like isofs
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* And it works!
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* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
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* ICBTAG_FLAG_AD_IN_ICB.
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* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
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* 05/12/99 Preliminary file write support
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/string.h> /* memset */
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/smp_lock.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/aio.h>
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#include <linux/smp_lock.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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static int udf_adinicb_readpage(struct file *file, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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BUG_ON(!PageLocked(page));
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kaddr = kmap(page);
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memset(kaddr, 0, PAGE_CACHE_SIZE);
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memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
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flush_dcache_page(page);
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SetPageUptodate(page);
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kunmap(page);
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unlock_page(page);
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return 0;
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}
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static int udf_adinicb_writepage(struct page *page,
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struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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BUG_ON(!PageLocked(page));
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kaddr = kmap(page);
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memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
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mark_inode_dirty(inode);
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SetPageUptodate(page);
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kunmap(page);
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unlock_page(page);
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return 0;
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}
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static int udf_adinicb_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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struct inode *inode = mapping->host;
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unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
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char *kaddr;
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struct udf_inode_info *iinfo = UDF_I(inode);
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kaddr = kmap_atomic(page, KM_USER0);
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memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
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kaddr + offset, copied);
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kunmap_atomic(kaddr, KM_USER0);
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return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
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}
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const struct address_space_operations udf_adinicb_aops = {
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.readpage = udf_adinicb_readpage,
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.writepage = udf_adinicb_writepage,
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.sync_page = block_sync_page,
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.write_begin = simple_write_begin,
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.write_end = udf_adinicb_write_end,
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};
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static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t ppos)
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{
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ssize_t retval;
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_path.dentry->d_inode;
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int err, pos;
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size_t count = iocb->ki_left;
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struct udf_inode_info *iinfo = UDF_I(inode);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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if (file->f_flags & O_APPEND)
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pos = inode->i_size;
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else
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pos = ppos;
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if (inode->i_sb->s_blocksize <
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(udf_file_entry_alloc_offset(inode) +
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pos + count)) {
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udf_expand_file_adinicb(inode, pos + count, &err);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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udf_debug("udf_expand_adinicb: err=%d\n", err);
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return err;
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}
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} else {
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if (pos + count > inode->i_size)
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iinfo->i_lenAlloc = pos + count;
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else
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iinfo->i_lenAlloc = inode->i_size;
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}
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}
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retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
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if (retval > 0)
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mark_inode_dirty(inode);
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return retval;
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}
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long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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long old_block, new_block;
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int result = -EINVAL;
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lock_kernel();
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if (file_permission(filp, MAY_READ) != 0) {
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udf_debug("no permission to access inode %lu\n", inode->i_ino);
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result = -EPERM;
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goto out;
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}
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if (!arg) {
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udf_debug("invalid argument to udf_ioctl\n");
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result = -EINVAL;
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goto out;
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}
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switch (cmd) {
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case UDF_GETVOLIDENT:
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if (copy_to_user((char __user *)arg,
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UDF_SB(inode->i_sb)->s_volume_ident, 32))
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result = -EFAULT;
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else
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result = 0;
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goto out;
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case UDF_RELOCATE_BLOCKS:
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if (!capable(CAP_SYS_ADMIN)) {
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result = -EACCES;
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goto out;
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}
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if (get_user(old_block, (long __user *)arg)) {
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result = -EFAULT;
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goto out;
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}
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result = udf_relocate_blocks(inode->i_sb,
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old_block, &new_block);
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if (result == 0)
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result = put_user(new_block, (long __user *)arg);
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goto out;
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case UDF_GETEASIZE:
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result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
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goto out;
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case UDF_GETEABLOCK:
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result = copy_to_user((char __user *)arg,
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UDF_I(inode)->i_ext.i_data,
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UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
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goto out;
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}
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out:
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unlock_kernel();
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return result;
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}
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static int udf_release_file(struct inode *inode, struct file *filp)
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{
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if (filp->f_mode & FMODE_WRITE) {
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mutex_lock(&inode->i_mutex);
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lock_kernel();
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udf_discard_prealloc(inode);
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udf_truncate_tail_extent(inode);
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unlock_kernel();
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mutex_unlock(&inode->i_mutex);
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}
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return 0;
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}
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const struct file_operations udf_file_operations = {
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.unlocked_ioctl = udf_ioctl,
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.open = generic_file_open,
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.mmap = generic_file_mmap,
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.write = do_sync_write,
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.aio_write = udf_file_aio_write,
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.release = udf_release_file,
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.fsync = generic_file_fsync,
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.splice_read = generic_file_splice_read,
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.llseek = generic_file_llseek,
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};
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static int udf_setattr(struct dentry *dentry, struct iattr *attr)
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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, attr);
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if (error)
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return error;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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error = vmtruncate(inode, attr->ia_size);
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if (error)
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return error;
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}
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setattr_copy(inode, attr);
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mark_inode_dirty(inode);
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return 0;
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}
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const struct inode_operations udf_file_inode_operations = {
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.setattr = udf_setattr,
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.truncate = udf_truncate,
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};
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