Release 4.10 fs/ext2/file.c
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 75 | 98.68% | 1 | 50.00% |
| ross zwisler | ross zwisler | 1 | 1.32% | 1 | 50.00% |
| Total | 76 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 157 | 99.37% | 1 | 50.00% |
| ross zwisler | ross zwisler | 1 | 0.63% | 1 | 50.00% |
| Total | 158 | 100.00% | 2 | 100.00% |
/*
* 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 int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
struct ext2_inode_info *ei = EXT2_I(inode);
int ret;
if (vmf->flags & FAULT_FLAG_WRITE) {
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
}
down_read(&ei->dax_sem);
ret = dax_iomap_fault(vma, vmf, &ext2_iomap_ops);
up_read(&ei->dax_sem);
if (vmf->flags & FAULT_FLAG_WRITE)
sb_end_pagefault(inode->i_sb);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ross zwisler | ross zwisler | 86 | 77.48% | 2 | 50.00% |
| matthew wilcox | matthew wilcox | 23 | 20.72% | 1 | 25.00% |
| christoph hellwig | christoph hellwig | 2 | 1.80% | 1 | 25.00% |
| Total | 111 | 100.00% | 4 | 100.00% |
static int ext2_dax_pfn_mkwrite(struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
struct ext2_inode_info *ei = EXT2_I(inode);
loff_t size;
int ret;
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
down_read(&ei->dax_sem);
/* check that the faulting page hasn't raced with truncate */
size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (vmf->pgoff >= size)
ret = VM_FAULT_SIGBUS;
else
ret = dax_pfn_mkwrite(vma, vmf);
up_read(&ei->dax_sem);
sb_end_pagefault(inode->i_sb);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ross zwisler | ross zwisler | 120 | 98.36% | 2 | 66.67% |
| matthew wilcox | matthew wilcox | 2 | 1.64% | 1 | 33.33% |
| Total | 122 | 100.00% | 3 | 100.00% |
static const struct vm_operations_struct ext2_dax_vm_ops = {
.fault = ext2_dax_fault,
/*
* .pmd_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_pfn_mkwrite,
};
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;
vma->vm_flags |= VM_MIXEDMAP;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| matthew wilcox | matthew wilcox | 56 | 100.00% | 1 | 100.00% |
| Total | 56 | 100.00% | 1 | 100.00% |
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 31 | 55.36% | 3 | 75.00% |
| martin bligh | martin bligh | 25 | 44.64% | 1 | 25.00% |
| Total | 56 | 100.00% | 4 | 100.00% |
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;
struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
ret = generic_file_fsync(file, start, end, datasync);
if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
/* We don't really know where the IO error happened... */
ext2_error(sb, __func__,
"detected IO error when writing metadata buffers");
ret = -EIO;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jan kara | jan kara | 83 | 84.69% | 1 | 25.00% |
| josef bacik | josef bacik | 10 | 10.20% | 1 | 25.00% |
| christoph hellwig | christoph hellwig | 5 | 5.10% | 2 | 50.00% |
| Total | 98 | 100.00% | 4 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 50 | 100.00% | 1 | 100.00% |
| Total | 50 | 100.00% | 1 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 50 | 100.00% | 1 | 100.00% |
| Total | 50 | 100.00% | 1 | 100.00% |
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
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.fiemap = ext2_fiemap,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 359 | 37.75% | 8 | 17.02% |
| ross zwisler | ross zwisler | 212 | 22.29% | 5 | 10.64% |
| matthew wilcox | matthew wilcox | 113 | 11.88% | 4 | 8.51% |
| jan kara | jan kara | 88 | 9.25% | 2 | 4.26% |
| pre-git | pre-git | 62 | 6.52% | 8 | 17.02% |
| martin bligh | martin bligh | 25 | 2.63% | 1 | 2.13% |
| theodore tso | theodore tso | 19 | 2.00% | 2 | 4.26% |
| josef bacik | josef bacik | 15 | 1.58% | 2 | 4.26% |
| andrew morton | andrew morton | 13 | 1.37% | 1 | 2.13% |
| david howells | david howells | 10 | 1.05% | 1 | 2.13% |
| jens axboe | jens axboe | 7 | 0.74% | 1 | 2.13% |
| benjamin lahaise | benjamin lahaise | 6 | 0.63% | 1 | 2.13% |
| toshi kani | toshi kani | 5 | 0.53% | 1 | 2.13% |
| james morris | james morris | 5 | 0.53% | 1 | 2.13% |
| boaz harrosh | boaz harrosh | 4 | 0.42% | 1 | 2.13% |
| al viro | al viro | 3 | 0.32% | 3 | 6.38% |
| arjan van de ven | arjan van de ven | 2 | 0.21% | 2 | 4.26% |
| linus torvalds | linus torvalds | 2 | 0.21% | 2 | 4.26% |
| andi kleen | andi kleen | 1 | 0.11% | 1 | 2.13% |
| Total | 951 | 100.00% | 47 | 100.00% |
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