| /* |
| * file.c |
| * |
| * PURPOSE |
| * File handling routines for the OSTA-UDF(tm) filesystem. |
| * |
| * COPYRIGHT |
| * This file is distributed under the terms of the GNU General Public |
| * License (GPL). Copies of the GPL can be obtained from: |
| * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| * Each contributing author retains all rights to their own work. |
| * |
| * (C) 1998-1999 Dave Boynton |
| * (C) 1998-2004 Ben Fennema |
| * (C) 1999-2000 Stelias Computing Inc |
| * |
| * HISTORY |
| * |
| * 10/02/98 dgb Attempt to integrate into udf.o |
| * 10/07/98 Switched to using generic_readpage, etc., like isofs |
| * And it works! |
| * 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but |
| * ICBTAG_FLAG_AD_IN_ICB. |
| * 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c |
| * 05/12/99 Preliminary file write support |
| */ |
| |
| #include "udfdecl.h" |
| #include <linux/fs.h> |
| #include <linux/udf_fs.h> |
| #include <asm/uaccess.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> /* memset */ |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/smp_lock.h> |
| #include <linux/pagemap.h> |
| #include <linux/buffer_head.h> |
| #include <linux/aio.h> |
| |
| #include "udf_i.h" |
| #include "udf_sb.h" |
| |
| static int udf_adinicb_readpage(struct file *file, struct page *page) |
| { |
| struct inode *inode = page->mapping->host; |
| char *kaddr; |
| |
| BUG_ON(!PageLocked(page)); |
| |
| kaddr = kmap(page); |
| memset(kaddr, 0, PAGE_CACHE_SIZE); |
| memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size); |
| flush_dcache_page(page); |
| SetPageUptodate(page); |
| kunmap(page); |
| unlock_page(page); |
| |
| return 0; |
| } |
| |
| static int udf_adinicb_writepage(struct page *page, |
| struct writeback_control *wbc) |
| { |
| struct inode *inode = page->mapping->host; |
| char *kaddr; |
| |
| BUG_ON(!PageLocked(page)); |
| |
| kaddr = kmap(page); |
| memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size); |
| mark_inode_dirty(inode); |
| SetPageUptodate(page); |
| kunmap(page); |
| unlock_page(page); |
| |
| return 0; |
| } |
| |
| static int udf_adinicb_write_end(struct file *file, |
| struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata) |
| { |
| struct inode *inode = mapping->host; |
| unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| char *kaddr; |
| |
| kaddr = kmap_atomic(page, KM_USER0); |
| memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, |
| kaddr + offset, copied); |
| kunmap_atomic(kaddr, KM_USER0); |
| |
| return simple_write_end(file, mapping, pos, len, copied, page, fsdata); |
| } |
| |
| const struct address_space_operations udf_adinicb_aops = { |
| .readpage = udf_adinicb_readpage, |
| .writepage = udf_adinicb_writepage, |
| .sync_page = block_sync_page, |
| .write_begin = simple_write_begin, |
| .write_end = udf_adinicb_write_end, |
| }; |
| |
| static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t ppos) |
| { |
| ssize_t retval; |
| struct file *file = iocb->ki_filp; |
| struct inode *inode = file->f_path.dentry->d_inode; |
| int err, pos; |
| size_t count = iocb->ki_left; |
| |
| if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
| if (file->f_flags & O_APPEND) |
| pos = inode->i_size; |
| else |
| pos = ppos; |
| |
| if (inode->i_sb->s_blocksize < |
| (udf_file_entry_alloc_offset(inode) + |
| pos + count)) { |
| udf_expand_file_adinicb(inode, pos + count, &err); |
| if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
| udf_debug("udf_expand_adinicb: err=%d\n", err); |
| return err; |
| } |
| } else { |
| if (pos + count > inode->i_size) |
| UDF_I_LENALLOC(inode) = pos + count; |
| else |
| UDF_I_LENALLOC(inode) = inode->i_size; |
| } |
| } |
| |
| retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
| if (retval > 0) |
| mark_inode_dirty(inode); |
| |
| return retval; |
| } |
| |
| /* |
| * udf_ioctl |
| * |
| * PURPOSE |
| * Issue an ioctl. |
| * |
| * DESCRIPTION |
| * Optional - sys_ioctl() will return -ENOTTY if this routine is not |
| * available, and the ioctl cannot be handled without filesystem help. |
| * |
| * sys_ioctl() handles these ioctls that apply only to regular files: |
| * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD |
| * These ioctls are also handled by sys_ioctl(): |
| * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC |
| * All other ioctls are passed to the filesystem. |
| * |
| * Refer to sys_ioctl() in fs/ioctl.c |
| * sys_ioctl() -> . |
| * |
| * PRE-CONDITIONS |
| * inode Pointer to inode that ioctl was issued on. |
| * filp Pointer to file that ioctl was issued on. |
| * cmd The ioctl command. |
| * arg The ioctl argument [can be interpreted as a |
| * user-space pointer if desired]. |
| * |
| * POST-CONDITIONS |
| * <return> Success (>=0) or an error code (<=0) that |
| * sys_ioctl() will return. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
| unsigned long arg) |
| { |
| long old_block, new_block; |
| int result = -EINVAL; |
| |
| if (file_permission(filp, MAY_READ) != 0) { |
| udf_debug("no permission to access inode %lu\n", |
| inode->i_ino); |
| return -EPERM; |
| } |
| |
| if (!arg) { |
| udf_debug("invalid argument to udf_ioctl\n"); |
| return -EINVAL; |
| } |
| |
| switch (cmd) { |
| case UDF_GETVOLIDENT: |
| if (copy_to_user((char __user *)arg, |
| UDF_SB(inode->i_sb)->s_volume_ident, 32)) |
| return -EFAULT; |
| else |
| return 0; |
| case UDF_RELOCATE_BLOCKS: |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (get_user(old_block, (long __user *)arg)) |
| return -EFAULT; |
| result = udf_relocate_blocks(inode->i_sb, |
| old_block, &new_block); |
| if (result == 0) |
| result = put_user(new_block, (long __user *)arg); |
| return result; |
| case UDF_GETEASIZE: |
| result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg); |
| break; |
| case UDF_GETEABLOCK: |
| result = copy_to_user((char __user *)arg, UDF_I_DATA(inode), |
| UDF_I_LENEATTR(inode)) ? -EFAULT : 0; |
| break; |
| } |
| |
| return result; |
| } |
| |
| /* |
| * udf_release_file |
| * |
| * PURPOSE |
| * Called when all references to the file are closed |
| * |
| * DESCRIPTION |
| * Discard prealloced blocks |
| * |
| * HISTORY |
| * |
| */ |
| static int udf_release_file(struct inode *inode, struct file *filp) |
| { |
| if (filp->f_mode & FMODE_WRITE) { |
| lock_kernel(); |
| udf_discard_prealloc(inode); |
| unlock_kernel(); |
| } |
| return 0; |
| } |
| |
| const struct file_operations udf_file_operations = { |
| .read = do_sync_read, |
| .aio_read = generic_file_aio_read, |
| .ioctl = udf_ioctl, |
| .open = generic_file_open, |
| .mmap = generic_file_mmap, |
| .write = do_sync_write, |
| .aio_write = udf_file_aio_write, |
| .release = udf_release_file, |
| .fsync = udf_fsync_file, |
| .splice_read = generic_file_splice_read, |
| }; |
| |
| const struct inode_operations udf_file_inode_operations = { |
| .truncate = udf_truncate, |
| }; |