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); 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); 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 }; 43 44 static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) 45 { 46 if (!IS_DAX(file_inode(file))) 47 return generic_file_mmap(file, vma); 48 49 file_accessed(file); 50 vma->vm_ops = &ext2_dax_vm_ops; 51 vma->vm_flags |= VM_MIXEDMAP; 52 return 0; 53 } 54 #else 55 #define ext2_file_mmap generic_file_mmap 56 #endif 57 58 /* 59 * Called when filp is released. This happens when all file descriptors 60 * for a single struct file are closed. Note that different open() calls 61 * for the same file yield different struct file structures. 62 */ 63 static int ext2_release_file (struct inode * inode, struct file * filp) 64 { 65 if (filp->f_mode & FMODE_WRITE) { 66 mutex_lock(&EXT2_I(inode)->truncate_mutex); 67 ext2_discard_reservation(inode); 68 mutex_unlock(&EXT2_I(inode)->truncate_mutex); 69 } 70 return 0; 71 } 72 73 int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync) 74 { 75 int ret; 76 struct super_block *sb = file->f_mapping->host->i_sb; 77 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 78 79 ret = generic_file_fsync(file, start, end, datasync); 80 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) { 81 /* We don't really know where the IO error happened... */ 82 ext2_error(sb, __func__, 83 "detected IO error when writing metadata buffers"); 84 ret = -EIO; 85 } 86 return ret; 87 } 88 89 /* 90 * We have mostly NULL's here: the current defaults are ok for 91 * the ext2 filesystem. 92 */ 93 const struct file_operations ext2_file_operations = { 94 .llseek = generic_file_llseek, 95 .read = new_sync_read, 96 .write = new_sync_write, 97 .read_iter = generic_file_read_iter, 98 .write_iter = generic_file_write_iter, 99 .unlocked_ioctl = ext2_ioctl, 100 #ifdef CONFIG_COMPAT 101 .compat_ioctl = ext2_compat_ioctl, 102 #endif 103 .mmap = ext2_file_mmap, 104 .open = dquot_file_open, 105 .release = ext2_release_file, 106 .fsync = ext2_fsync, 107 .splice_read = generic_file_splice_read, 108 .splice_write = iter_file_splice_write, 109 }; 110 111 #ifdef CONFIG_FS_DAX 112 const struct file_operations ext2_dax_file_operations = { 113 .llseek = generic_file_llseek, 114 .read = new_sync_read, 115 .write = new_sync_write, 116 .read_iter = generic_file_read_iter, 117 .write_iter = generic_file_write_iter, 118 .unlocked_ioctl = ext2_ioctl, 119 #ifdef CONFIG_COMPAT 120 .compat_ioctl = ext2_compat_ioctl, 121 #endif 122 .mmap = ext2_file_mmap, 123 .open = dquot_file_open, 124 .release = ext2_release_file, 125 .fsync = ext2_fsync, 126 }; 127 #endif 128 129 const struct inode_operations ext2_file_inode_operations = { 130 #ifdef CONFIG_EXT2_FS_XATTR 131 .setxattr = generic_setxattr, 132 .getxattr = generic_getxattr, 133 .listxattr = ext2_listxattr, 134 .removexattr = generic_removexattr, 135 #endif 136 .setattr = ext2_setattr, 137 .get_acl = ext2_get_acl, 138 .set_acl = ext2_set_acl, 139 .fiemap = ext2_fiemap, 140 }; 141