Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * file.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * PURPOSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  File handling routines for the OSTA-UDF(tm) filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * COPYRIGHT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  This file is distributed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  License (GPL). Copies of the GPL can be obtained from:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *  Each contributing author retains all rights to their own work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *  (C) 1998-1999 Dave Boynton
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *  (C) 1998-2004 Ben Fennema
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *  (C) 1999-2000 Stelias Computing Inc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * HISTORY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *  10/02/98 dgb  Attempt to integrate into udf.o
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *  10/07/98      Switched to using generic_readpage, etc., like isofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *                And it works!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *  12/06/98 blf  Added udf_file_read. uses generic_file_read for all cases but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *                ICBTAG_FLAG_AD_IN_ICB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *  04/06/99      64 bit file handling on 32 bit systems taken from ext2 file.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *  05/12/99      Preliminary file write support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "udfdecl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/string.h> /* memset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include "udf_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include "udf_sb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static void __udf_adinicb_readpage(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	char *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct udf_inode_info *iinfo = UDF_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	loff_t isize = i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	 * We have to be careful here as truncate can change i_size under us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	 * So just sample it once and use the same value everywhere.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	kaddr = kmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr, isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	memset(kaddr + isize, 0, PAGE_SIZE - isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	flush_dcache_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static int udf_adinicb_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	__udf_adinicb_readpage(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static int udf_adinicb_writepage(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 				 struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	char *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct udf_inode_info *iinfo = UDF_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	kaddr = kmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, i_size_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static int udf_adinicb_write_begin(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			struct address_space *mapping, loff_t pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			unsigned len, unsigned flags, struct page **pagep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (WARN_ON_ONCE(pos >= PAGE_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	page = grab_cache_page_write_begin(mapping, 0, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	*pagep = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (!PageUptodate(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		__udf_adinicb_readpage(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	/* Fallback to buffered I/O. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int udf_adinicb_write_end(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 				 loff_t pos, unsigned len, unsigned copied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 				 struct page *page, void *fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	loff_t last_pos = pos + copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (last_pos > inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		i_size_write(inode, last_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	set_page_dirty(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) const struct address_space_operations udf_adinicb_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	.readpage	= udf_adinicb_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	.writepage	= udf_adinicb_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	.write_begin	= udf_adinicb_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	.write_end	= udf_adinicb_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	.direct_IO	= udf_adinicb_direct_IO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	ssize_t retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct file *file = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct udf_inode_info *iinfo = UDF_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	retval = generic_write_checks(iocb, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (retval <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	down_write(&iinfo->i_data_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		loff_t end = iocb->ki_pos + iov_iter_count(from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		if (inode->i_sb->s_blocksize <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 				(udf_file_entry_alloc_offset(inode) + end)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			err = udf_expand_file_adinicb(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 				udf_debug("udf_expand_adinicb: err=%d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			iinfo->i_lenAlloc = max(end, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			up_write(&iinfo->i_data_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		up_write(&iinfo->i_data_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	retval = __generic_file_write_iter(iocb, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (retval > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		retval = generic_write_sync(iocb, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	long old_block, new_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (inode_permission(inode, MAY_READ) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		udf_debug("no permission to access inode %lu\n", inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (!arg && ((cmd == UDF_GETVOLIDENT) || (cmd == UDF_GETEASIZE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		     (cmd == UDF_RELOCATE_BLOCKS) || (cmd == UDF_GETEABLOCK))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		udf_debug("invalid argument to udf_ioctl\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	case UDF_GETVOLIDENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		if (copy_to_user((char __user *)arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 				 UDF_SB(inode->i_sb)->s_volume_ident, 32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	case UDF_RELOCATE_BLOCKS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (get_user(old_block, (long __user *)arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		result = udf_relocate_blocks(inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 						old_block, &new_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		if (result == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			result = put_user(new_block, (long __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	case UDF_GETEASIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	case UDF_GETEABLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return copy_to_user((char __user *)arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 				    UDF_I(inode)->i_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 				    UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static int udf_release_file(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (filp->f_mode & FMODE_WRITE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	    atomic_read(&inode->i_writecount) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		 * Grab i_mutex to avoid races with writes changing i_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		 * while we are running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		down_write(&UDF_I(inode)->i_data_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		udf_discard_prealloc(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		udf_truncate_tail_extent(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		up_write(&UDF_I(inode)->i_data_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) const struct file_operations udf_file_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	.read_iter		= generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	.unlocked_ioctl		= udf_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	.open			= generic_file_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.mmap			= generic_file_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.write_iter		= udf_file_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	.release		= udf_release_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	.fsync			= generic_file_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.splice_read		= generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.llseek			= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static int udf_setattr(struct dentry *dentry, struct iattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	error = setattr_prepare(dentry, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if ((attr->ia_valid & ATTR_UID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	    UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	    !uid_eq(attr->ia_uid, UDF_SB(sb)->s_uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if ((attr->ia_valid & ATTR_GID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	    UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	    !gid_eq(attr->ia_gid, UDF_SB(sb)->s_gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if ((attr->ia_valid & ATTR_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	    attr->ia_size != i_size_read(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		error = udf_setsize(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (attr->ia_valid & ATTR_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		udf_update_extra_perms(inode, attr->ia_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	setattr_copy(inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) const struct inode_operations udf_file_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	.setattr		= udf_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) };