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_pmd_fault(struct vm_area_struct *vma, unsigned long addr, 36 pmd_t *pmd, unsigned int flags) 37 { 38 return dax_pmd_fault(vma, addr, pmd, flags, ext2_get_block, NULL); 39 } 40 41 static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 42 { 43 return dax_mkwrite(vma, vmf, ext2_get_block, NULL); 44 } 45 46 static const struct vm_operations_struct ext2_dax_vm_ops = { 47 .fault = ext2_dax_fault, 48 .pmd_fault = ext2_dax_pmd_fault, 49 .page_mkwrite = ext2_dax_mkwrite, 50 .pfn_mkwrite = dax_pfn_mkwrite, 51 }; 52 53 static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) 54 { 55 if (!IS_DAX(file_inode(file))) 56 return generic_file_mmap(file, vma); 57 58 file_accessed(file); 59 vma->vm_ops = &ext2_dax_vm_ops; 60 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; 61 return 0; 62 } 63 #else 64 #define ext2_file_mmap generic_file_mmap 65 #endif 66 67 /* 68 * Called when filp is released. This happens when all file descriptors 69 * for a single struct file are closed. Note that different open() calls 70 * for the same file yield different struct file structures. 71 */ 72 static int ext2_release_file (struct inode * inode, struct file * filp) 73 { 74 if (filp->f_mode & FMODE_WRITE) { 75 mutex_lock(&EXT2_I(inode)->truncate_mutex); 76 ext2_discard_reservation(inode); 77 mutex_unlock(&EXT2_I(inode)->truncate_mutex); 78 } 79 return 0; 80 } 81 82 int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync) 83 { 84 int ret; 85 struct super_block *sb = file->f_mapping->host->i_sb; 86 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 87 88 ret = generic_file_fsync(file, start, end, datasync); 89 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) { 90 /* We don't really know where the IO error happened... */ 91 ext2_error(sb, __func__, 92 "detected IO error when writing metadata buffers"); 93 ret = -EIO; 94 } 95 return ret; 96 } 97 98 /* 99 * We have mostly NULL's here: the current defaults are ok for 100 * the ext2 filesystem. 101 */ 102 const struct file_operations ext2_file_operations = { 103 .llseek = generic_file_llseek, 104 .read_iter = generic_file_read_iter, 105 .write_iter = generic_file_write_iter, 106 .unlocked_ioctl = ext2_ioctl, 107 #ifdef CONFIG_COMPAT 108 .compat_ioctl = ext2_compat_ioctl, 109 #endif 110 .mmap = ext2_file_mmap, 111 .open = dquot_file_open, 112 .release = ext2_release_file, 113 .fsync = ext2_fsync, 114 .splice_read = generic_file_splice_read, 115 .splice_write = iter_file_splice_write, 116 }; 117 118 const struct inode_operations ext2_file_inode_operations = { 119 #ifdef CONFIG_EXT2_FS_XATTR 120 .setxattr = generic_setxattr, 121 .getxattr = generic_getxattr, 122 .listxattr = ext2_listxattr, 123 .removexattr = generic_removexattr, 124 #endif 125 .setattr = ext2_setattr, 126 .get_acl = ext2_get_acl, 127 .set_acl = ext2_set_acl, 128 .fiemap = ext2_fiemap, 129 }; 130