907f4554e2
Currently various places in the VFS call vfs_dq_init directly. This means we tie the quota code into the VFS. Get rid of that and make the filesystem responsible for the initialization. For most metadata operations this is a straight forward move into the methods, but for truncate and open it's a bit more complicated. For truncate we currently only call vfs_dq_init for the sys_truncate case because open already takes care of it for ftruncate and open(O_TRUNC) - the new code causes an additional vfs_dq_init for those which is harmless. For open the initialization is moved from do_filp_open into the open method, which means it happens slightly earlier now, and only for regular files. The latter is fine because we don't need to initialize it for operations on special files, and we already do it as part of the namespace operations for directories. Add a dquot_file_open helper that filesystems that support generic quotas can use to fill in ->open. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
247 lines
6.2 KiB
C
247 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/quotaops.h>
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#include <linux/buffer_head.h>
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#include <linux/aio.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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int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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long old_block, new_block;
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int result = -EINVAL;
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if (file_permission(filp, MAY_READ) != 0) {
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udf_debug("no permission to access inode %lu\n",
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inode->i_ino);
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return -EPERM;
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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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return -EINVAL;
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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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return -EFAULT;
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else
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return 0;
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case UDF_RELOCATE_BLOCKS:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (get_user(old_block, (long __user *)arg))
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return -EFAULT;
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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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return result;
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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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break;
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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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break;
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}
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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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.ioctl = udf_ioctl,
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.open = dquot_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 = simple_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 *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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if (iattr->ia_valid & ATTR_SIZE)
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vfs_dq_init(inode);
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if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
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(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
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error = dquot_transfer(inode, iattr);
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if (error)
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return error;
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}
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return inode_setattr(inode, iattr);
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}
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const struct inode_operations udf_file_inode_operations = {
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.truncate = udf_truncate,
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.setattr = udf_setattr,
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};
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