Contributors: 23
Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
Christoph Hellwig |
359 |
44.76% |
8 |
15.09% |
Matthew Wilcox |
97 |
12.09% |
4 |
7.55% |
Ross Zwisler |
90 |
11.22% |
4 |
7.55% |
Linus Torvalds (pre-git) |
62 |
7.73% |
7 |
13.21% |
Jan Kara |
62 |
7.73% |
4 |
7.55% |
Martin J. Bligh |
25 |
3.12% |
1 |
1.89% |
Theodore Y. Ts'o |
19 |
2.37% |
2 |
3.77% |
Josef Bacik |
15 |
1.87% |
2 |
3.77% |
Andrew Morton |
13 |
1.62% |
1 |
1.89% |
David Howells |
10 |
1.25% |
1 |
1.89% |
Dave Jiang |
7 |
0.87% |
3 |
5.66% |
Jens Axboe |
7 |
0.87% |
1 |
1.89% |
Benjamin LaHaise |
6 |
0.75% |
1 |
1.89% |
James Morris |
5 |
0.62% |
1 |
1.89% |
yangerkun |
5 |
0.62% |
1 |
1.89% |
Toshi Kani |
5 |
0.62% |
1 |
1.89% |
Boaz Harrosh |
4 |
0.50% |
1 |
1.89% |
Al Viro |
3 |
0.37% |
3 |
5.66% |
Souptick Joarder |
2 |
0.25% |
1 |
1.89% |
Arjan van de Ven |
2 |
0.25% |
2 |
3.77% |
Linus Torvalds |
2 |
0.25% |
2 |
3.77% |
Greg Kroah-Hartman |
1 |
0.12% |
1 |
1.89% |
Andi Kleen |
1 |
0.12% |
1 |
1.89% |
Total |
802 |
|
53 |
|
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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/ext2/file.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/file.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* ext2 fs regular file handling primitives
*
* 64-bit file support on 64-bit platforms by Jakub Jelinek
* (jj@sunsite.ms.mff.cuni.cz)
*/
#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/dax.h>
#include <linux/quotaops.h>
#include <linux/iomap.h>
#include <linux/uio.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"
#ifdef CONFIG_FS_DAX
static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct inode *inode = iocb->ki_filp->f_mapping->host;
ssize_t ret;
if (!iov_iter_count(to))
return 0; /* skip atime */
inode_lock_shared(inode);
ret = dax_iomap_rw(iocb, to, &ext2_iomap_ops);
inode_unlock_shared(inode);
file_accessed(iocb->ki_filp);
return ret;
}
static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;
inode_lock(inode);
ret = generic_write_checks(iocb, from);
if (ret <= 0)
goto out_unlock;
ret = file_remove_privs(file);
if (ret)
goto out_unlock;
ret = file_update_time(file);
if (ret)
goto out_unlock;
ret = dax_iomap_rw(iocb, from, &ext2_iomap_ops);
if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
i_size_write(inode, iocb->ki_pos);
mark_inode_dirty(inode);
}
out_unlock:
inode_unlock(inode);
if (ret > 0)
ret = generic_write_sync(iocb, ret);
return ret;
}
/*
* The lock ordering for ext2 DAX fault paths is:
*
* mmap_sem (MM)
* sb_start_pagefault (vfs, freeze)
* ext2_inode_info->dax_sem
* address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
* ext2_inode_info->truncate_mutex
*
* The default page_lock and i_size verification done by non-DAX fault paths
* is sufficient because ext2 doesn't support hole punching.
*/
static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
{
struct inode *inode = file_inode(vmf->vma->vm_file);
struct ext2_inode_info *ei = EXT2_I(inode);
vm_fault_t ret;
if (vmf->flags & FAULT_FLAG_WRITE) {
sb_start_pagefault(inode->i_sb);
file_update_time(vmf->vma->vm_file);
}
down_read(&ei->dax_sem);
ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
up_read(&ei->dax_sem);
if (vmf->flags & FAULT_FLAG_WRITE)
sb_end_pagefault(inode->i_sb);
return ret;
}
static const struct vm_operations_struct ext2_dax_vm_ops = {
.fault = ext2_dax_fault,
/*
* .huge_fault is not supported for DAX because allocation in ext2
* cannot be reliably aligned to huge page sizes and so pmd faults
* will always fail and fail back to regular faults.
*/
.page_mkwrite = ext2_dax_fault,
.pfn_mkwrite = ext2_dax_fault,
};
static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!IS_DAX(file_inode(file)))
return generic_file_mmap(file, vma);
file_accessed(file);
vma->vm_ops = &ext2_dax_vm_ops;
return 0;
}
#else
#define ext2_file_mmap generic_file_mmap
#endif
/*
* Called when filp is released. This happens when all file descriptors
* for a single struct file are closed. Note that different open() calls
* for the same file yield different struct file structures.
*/
static int ext2_release_file (struct inode * inode, struct file * filp)
{
if (filp->f_mode & FMODE_WRITE) {
mutex_lock(&EXT2_I(inode)->truncate_mutex);
ext2_discard_reservation(inode);
mutex_unlock(&EXT2_I(inode)->truncate_mutex);
}
return 0;
}
int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
int ret;
struct super_block *sb = file->f_mapping->host->i_sb;
ret = generic_file_fsync(file, start, end, datasync);
if (ret == -EIO)
/* We don't really know where the IO error happened... */
ext2_error(sb, __func__,
"detected IO error when writing metadata buffers");
return ret;
}
static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
#ifdef CONFIG_FS_DAX
if (IS_DAX(iocb->ki_filp->f_mapping->host))
return ext2_dax_read_iter(iocb, to);
#endif
return generic_file_read_iter(iocb, to);
}
static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
#ifdef CONFIG_FS_DAX
if (IS_DAX(iocb->ki_filp->f_mapping->host))
return ext2_dax_write_iter(iocb, from);
#endif
return generic_file_write_iter(iocb, from);
}
const struct file_operations ext2_file_operations = {
.llseek = generic_file_llseek,
.read_iter = ext2_file_read_iter,
.write_iter = ext2_file_write_iter,
.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
#endif
.mmap = ext2_file_mmap,
.open = dquot_file_open,
.release = ext2_release_file,
.fsync = ext2_fsync,
.get_unmapped_area = thp_get_unmapped_area,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
};
const struct inode_operations ext2_file_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
.listxattr = ext2_listxattr,
#endif
.getattr = ext2_getattr,
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.fiemap = ext2_fiemap,
};