/* * 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 #include #include #include #include #include #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 = iomap_dax_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 = iomap_dax_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 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 = iomap_dax_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; } static int ext2_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, unsigned int flags) { struct inode *inode = file_inode(vma->vm_file); struct ext2_inode_info *ei = EXT2_I(inode); int ret; if (flags & FAULT_FLAG_WRITE) { sb_start_pagefault(inode->i_sb); file_update_time(vma->vm_file); } down_read(&ei->dax_sem); ret = dax_pmd_fault(vma, addr, pmd, flags, ext2_get_block); up_read(&ei->dax_sem); if (flags & FAULT_FLAG_WRITE) sb_end_pagefault(inode->i_sb); return ret; } 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; } static const struct vm_operations_struct ext2_dax_vm_ops = { .fault = ext2_dax_fault, .pmd_fault = ext2_dax_pmd_fault, .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 | VM_HUGEPAGE; 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; 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; } 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, .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 .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = ext2_listxattr, .removexattr = generic_removexattr, #endif .setattr = ext2_setattr, .get_acl = ext2_get_acl, .set_acl = ext2_set_acl, .fiemap = ext2_fiemap, };