1 /* 2 * linux/fs/ext2/file.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/file.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * ext2 fs regular file handling primitives 16 * 17 * 64-bit file support on 64-bit platforms by Jakub Jelinek 18 * (jj@sunsite.ms.mff.cuni.cz) 19 */ 20 21 #include <linux/time.h> 22 #include <linux/pagemap.h> 23 #include <linux/quotaops.h> 24 #include "ext2.h" 25 #include "xattr.h" 26 #include "acl.h" 27 28 #ifdef CONFIG_FS_DAX 29 static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 30 { 31 return dax_fault(vma, vmf, ext2_get_block, NULL); 32 } 33 34 static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 35 { 36 return dax_mkwrite(vma, vmf, ext2_get_block, NULL); 37 } 38 39 static const struct vm_operations_struct ext2_dax_vm_ops = { 40 .fault = ext2_dax_fault, 41 .page_mkwrite = ext2_dax_mkwrite, 42 .pfn_mkwrite = dax_pfn_mkwrite, 43 }; 44 45 static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) 46 { 47 if (!IS_DAX(file_inode(file))) 48 return generic_file_mmap(file, vma); 49 50 file_accessed(file); 51 vma->vm_ops = &ext2_dax_vm_ops; 52 vma->vm_flags |= VM_MIXEDMAP; 53 return 0; 54 } 55 #else 56 #define ext2_file_mmap generic_file_mmap 57 #endif 58 59 /* 60 * Called when filp is released. This happens when all file descriptors 61 * for a single struct file are closed. Note that different open() calls 62 * for the same file yield different struct file structures. 63 */ 64 static int ext2_release_file (struct inode * inode, struct file * filp) 65 { 66 if (filp->f_mode & FMODE_WRITE) { 67 mutex_lock(&EXT2_I(inode)->truncate_mutex); 68 ext2_discard_reservation(inode); 69 mutex_unlock(&EXT2_I(inode)->truncate_mutex); 70 } 71 return 0; 72 } 73 74 int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync) 75 { 76 int ret; 77 struct super_block *sb = file->f_mapping->host->i_sb; 78 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 79 80 ret = generic_file_fsync(file, start, end, datasync); 81 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) { 82 /* We don't really know where the IO error happened... */ 83 ext2_error(sb, __func__, 84 "detected IO error when writing metadata buffers"); 85 ret = -EIO; 86 } 87 return ret; 88 } 89 90 /* 91 * We have mostly NULL's here: the current defaults are ok for 92 * the ext2 filesystem. 93 */ 94 const struct file_operations ext2_file_operations = { 95 .llseek = generic_file_llseek, 96 .read_iter = generic_file_read_iter, 97 .write_iter = generic_file_write_iter, 98 .unlocked_ioctl = ext2_ioctl, 99 #ifdef CONFIG_COMPAT 100 .compat_ioctl = ext2_compat_ioctl, 101 #endif 102 .mmap = ext2_file_mmap, 103 .open = dquot_file_open, 104 .release = ext2_release_file, 105 .fsync = ext2_fsync, 106 .splice_read = generic_file_splice_read, 107 .splice_write = iter_file_splice_write, 108 }; 109 110 const struct inode_operations ext2_file_inode_operations = { 111 #ifdef CONFIG_EXT2_FS_XATTR 112 .setxattr = generic_setxattr, 113 .getxattr = generic_getxattr, 114 .listxattr = ext2_listxattr, 115 .removexattr = generic_removexattr, 116 #endif 117 .setattr = ext2_setattr, 118 .get_acl = ext2_get_acl, 119 .set_acl = ext2_set_acl, 120 .fiemap = ext2_fiemap, 121 }; 122