cregit-Linux how code gets into the kernel

Release 4.10 fs/udf/file.c

Directory: fs/udf
/*
 * 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/uaccess.h>
#include <linux/kernel.h>
#include <linux/string.h> /* memset */
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/uio.h>

#include "udf_i.h"
#include "udf_sb.h"


static void __udf_adinicb_readpage(struct page *page) { struct inode *inode = page->mapping->host; char *kaddr; struct udf_inode_info *iinfo = UDF_I(inode); kaddr = kmap(page); memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); memset(kaddr + inode->i_size, 0, PAGE_SIZE - inode->i_size); flush_dcache_page(page); SetPageUptodate(page); kunmap(page); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git5457.45%550.00%
jan karajan kara1920.21%110.00%
marcin slusarzmarcin slusarz1819.15%220.00%
ben fennemaben fennema22.13%110.00%
kirill a. shutemovkirill a. shutemov11.06%110.00%
Total94100.00%10100.00%


static int udf_adinicb_readpage(struct file *file, struct page *page) { BUG_ON(!PageLocked(page)); __udf_adinicb_readpage(page); unlock_page(page); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jan karajan kara2976.32%120.00%
pre-gitpre-git718.42%240.00%
andrew mortonandrew morton12.63%120.00%
ben fennemaben fennema12.63%120.00%
Total38100.00%5100.00%


static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc) { struct inode *inode = page->mapping->host; char *kaddr; struct udf_inode_info *iinfo = UDF_I(inode); BUG_ON(!PageLocked(page)); kaddr = kmap(page); memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); mark_inode_dirty(inode); SetPageUptodate(page); kunmap(page); unlock_page(page); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git6565.66%436.36%
marcin slusarzmarcin slusarz1818.18%218.18%
andrew mortonandrew morton66.06%218.18%
linus torvaldslinus torvalds44.04%19.09%
ben fennemaben fennema44.04%19.09%
matt mackallmatt mackall22.02%19.09%
Total99100.00%11100.00%


static int udf_adinicb_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { struct page *page; if (WARN_ON_ONCE(pos >= PAGE_SIZE)) return -EIO; page = grab_cache_page_write_begin(mapping, 0, flags); if (!page) return -ENOMEM; *pagep = page; if (!PageUptodate(page)) __udf_adinicb_readpage(page); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jan karajan kara9498.95%150.00%
kirill a. shutemovkirill a. shutemov11.05%150.00%
Total95100.00%2100.00%


static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { /* Fallback to buffered I/O. */ return 0; }

Contributors

PersonTokensPropCommitsCommitProp
ian abbottian abbott1890.00%150.00%
al viroal viro210.00%150.00%
Total20100.00%2100.00%


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 = page->mapping->host; loff_t last_pos = pos + copied; if (last_pos > inode->i_size) i_size_write(inode, last_pos); set_page_dirty(page); unlock_page(page); put_page(page); return copied; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro85100.00%1100.00%
Total85100.00%1100.00%

const struct address_space_operations udf_adinicb_aops = { .readpage = udf_adinicb_readpage, .writepage = udf_adinicb_writepage, .write_begin = udf_adinicb_write_begin, .write_end = udf_adinicb_write_end, .direct_IO = udf_adinicb_direct_IO, };
static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { ssize_t retval; struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); struct udf_inode_info *iinfo = UDF_I(inode); int err; inode_lock(inode); retval = generic_write_checks(iocb, from); if (retval <= 0) goto out; down_write(&iinfo->i_data_sem); if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { loff_t end = iocb->ki_pos + iov_iter_count(from); if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) + end)) { err = udf_expand_file_adinicb(inode); if (err) { inode_unlock(inode); udf_debug("udf_expand_adinicb: err=%d\n", err); return err; } } else { iinfo->i_lenAlloc = max(end, inode->i_size); up_write(&iinfo->i_data_sem); } } else up_write(&iinfo->i_data_sem); retval = __generic_file_write_iter(iocb, from); out: inode_unlock(inode); if (retval > 0) { mark_inode_dirty(inode); retval = generic_write_sync(iocb, retval); } return retval; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git9341.33%523.81%
al viroal viro5223.11%628.57%
jan karajan kara4921.78%419.05%
marcin slusarzmarcin slusarz156.67%29.52%
badari pulavartybadari pulavarty135.78%14.76%
christoph hellwigchristoph hellwig20.89%29.52%
ben fennemaben fennema10.44%14.76%
Total225100.00%21100.00%


long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); long old_block, new_block; int result = -EINVAL; if (inode_permission(inode, MAY_READ) != 0) { udf_debug("no permission to access inode %lu\n", inode->i_ino); result = -EPERM; goto out; } if (!arg) { udf_debug("invalid argument to udf_ioctl\n"); result = -EINVAL; goto out; } switch (cmd) { case UDF_GETVOLIDENT: if (copy_to_user((char __user *)arg, UDF_SB(inode->i_sb)->s_volume_ident, 32)) result = -EFAULT; else result = 0; goto out; case UDF_RELOCATE_BLOCKS: if (!capable(CAP_SYS_ADMIN)) { result = -EPERM; goto out; } if (get_user(old_block, (long __user *)arg)) { result = -EFAULT; goto out; } result = udf_relocate_blocks(inode->i_sb, old_block, &new_block); if (result == 0) result = put_user(new_block, (long __user *)arg); goto out; case UDF_GETEASIZE: result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); goto out; case UDF_GETEABLOCK: result = copy_to_user((char __user *)arg, UDF_I(inode)->i_ext.i_data, UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; goto out; } out: return result; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git12343.16%214.29%
linus torvaldslinus torvalds6121.40%214.29%
john kacurjohn kacur5619.65%17.14%
marcin slusarzmarcin slusarz227.72%321.43%
al viroal viro103.51%321.43%
cyrill gorcunovcyrill gorcunov93.16%17.14%
ben fennemaben fennema31.05%17.14%
zhao hongjiangzhao hongjiang10.35%17.14%
Total285100.00%14100.00%


static int udf_release_file(struct inode *inode, struct file *filp) { if (filp->f_mode & FMODE_WRITE && atomic_read(&inode->i_writecount) == 1) { /* * Grab i_mutex to avoid races with writes changing i_size * while we are running. */ inode_lock(inode); down_write(&UDF_I(inode)->i_data_sem); udf_discard_prealloc(inode); udf_truncate_tail_extent(inode); up_write(&UDF_I(inode)->i_data_sem); inode_unlock(inode); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git3643.90%228.57%
jan karajan kara2429.27%342.86%
alessio igor boganialessio igor bogani2024.39%114.29%
al viroal viro22.44%114.29%
Total82100.00%7100.00%

const struct file_operations udf_file_operations = { .read_iter = generic_file_read_iter, .unlocked_ioctl = udf_ioctl, .open = generic_file_open, .mmap = generic_file_mmap, .write_iter = udf_file_write_iter, .release = udf_release_file, .fsync = generic_file_fsync, .splice_read = generic_file_splice_read, .llseek = generic_file_llseek, };
static int udf_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = d_inode(dentry); int error; error = setattr_prepare(dentry, attr); if (error) return error; if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size != i_size_read(inode)) { error = udf_setsize(inode, attr->ia_size); if (error) return error; } setattr_copy(inode, attr); mark_inode_dirty(inode); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig9393.94%240.00%
jan karajan kara33.03%240.00%
david howellsdavid howells33.03%120.00%
Total99100.00%5100.00%

const struct inode_operations udf_file_inode_operations = { .setattr = udf_setattr, };

Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git44535.51%913.04%
jan karajan kara22017.56%1014.49%
al viroal viro15612.45%1115.94%
christoph hellwigchristoph hellwig1088.62%1014.49%
marcin slusarzmarcin slusarz735.83%45.80%
linus torvaldslinus torvalds655.19%34.35%
john kacurjohn kacur574.55%11.45%
ian abbottian abbott231.84%11.45%
art haasart haas231.84%11.45%
alessio igor boganialessio igor bogani201.60%11.45%
badari pulavartybadari pulavarty151.20%11.45%
ben fennemaben fennema110.88%22.90%
cyrill gorcunovcyrill gorcunov90.72%11.45%
andrew mortonandrew morton70.56%22.90%
randy dunlaprandy dunlap30.24%11.45%
david howellsdavid howells30.24%11.45%
matt mackallmatt mackall20.16%11.45%
nick pigginnick piggin20.16%11.45%
alexey dobriyanalexey dobriyan20.16%11.45%
kirill a. shutemovkirill a. shutemov20.16%11.45%
arjan van de venarjan van de ven20.16%22.90%
jens axboejens axboe20.16%11.45%
adrian bunkadrian bunk10.08%11.45%
fabian frederickfabian frederick10.08%11.45%
zhao hongjiangzhao hongjiang10.08%11.45%
Total1253100.00%69100.00%
Directory: fs/udf
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