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/dax.h> 24 #include <linux/quotaops.h> 25 #include "ext2.h" 26 #include "xattr.h" 27 #include "acl.h" 28 29 #ifdef CONFIG_FS_DAX 30 static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 31 { 32 return dax_fault(vma, vmf, ext2_get_block, NULL); 33 } 34 35 static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 36 { 37 return dax_mkwrite(vma, vmf, ext2_get_block, NULL); 38 } 39 40 static const struct vm_operations_struct ext2_dax_vm_ops = { 41 .fault = ext2_dax_fault, 42 .page_mkwrite = ext2_dax_mkwrite, 43 .pfn_mkwrite = dax_pfn_mkwrite, 44 }; 45 46 static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) 47 { 48 if (!IS_DAX(file_inode(file))) 49 return generic_file_mmap(file, vma); 50 51 file_accessed(file); 52 vma->vm_ops = &ext2_dax_vm_ops; 53 vma->vm_flags |= VM_MIXEDMAP; 54 return 0; 55 } 56 #else 57 #define ext2_file_mmap generic_file_mmap 58 #endif 59 60 /* 61 * Called when filp is released. This happens when all file descriptors 62 * for a single struct file are closed. Note that different open() calls 63 * for the same file yield different struct file structures. 64 */ 65 static int ext2_release_file (struct inode * inode, struct file * filp) 66 { 67 if (filp->f_mode & FMODE_WRITE) { 68 mutex_lock(&EXT2_I(inode)->truncate_mutex); 69 ext2_discard_reservation(inode); 70 mutex_unlock(&EXT2_I(inode)->truncate_mutex); 71 } 72 return 0; 73 } 74 75 int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync) 76 { 77 int ret; 78 struct super_block *sb = file->f_mapping->host->i_sb; 79 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 80 81 ret = generic_file_fsync(file, start, end, datasync); 82 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) { 83 /* We don't really know where the IO error happened... */ 84 ext2_error(sb, __func__, 85 "detected IO error when writing metadata buffers"); 86 ret = -EIO; 87 } 88 return ret; 89 } 90 91 /* 92 * We have mostly NULL's here: the current defaults are ok for 93 * the ext2 filesystem. 94 */ 95 const struct file_operations ext2_file_operations = { 96 .llseek = generic_file_llseek, 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 const struct inode_operations ext2_file_inode_operations = { 112 #ifdef CONFIG_EXT2_FS_XATTR 113 .setxattr = generic_setxattr, 114 .getxattr = generic_getxattr, 115 .listxattr = ext2_listxattr, 116 .removexattr = generic_removexattr, 117 #endif 118 .setattr = ext2_setattr, 119 .get_acl = ext2_get_acl, 120 .set_acl = ext2_set_acl, 121 .fiemap = ext2_fiemap, 122 }; 123