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)
11 * linux/fs/minix/file.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * ext4 fs regular file handling primitives
17 * 64-bit file support on 64-bit platforms by Jakub Jelinek
18 * (jj@sunsite.ms.mff.cuni.cz)
21 #include <linux/time.h>
23 #include <linux/jbd2.h>
24 #include <linux/mount.h>
25 #include <linux/path.h>
26 #include <linux/quotaops.h>
28 #include "ext4_jbd2.h"
33 * Called when an inode is released. Note that this is different
34 * from ext4_file_open: open gets called at every open, but release
35 * gets called only when /all/ the files are closed.
37 static int ext4_release_file(struct inode *inode, struct file *filp)
39 if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
40 ext4_alloc_da_blocks(inode);
41 EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
43 /* if we are the last writer on the inode, drop the block reservation */
44 if ((filp->f_mode & FMODE_WRITE) &&
45 (atomic_read(&inode->i_writecount) == 1) &&
46 !EXT4_I(inode)->i_reserved_data_blocks)
48 down_write(&EXT4_I(inode)->i_data_sem);
49 ext4_discard_preallocations(inode);
50 up_write(&EXT4_I(inode)->i_data_sem);
52 if (is_dx(inode) && filp->private_data)
53 ext4_htree_free_dir_info(filp->private_data);
59 ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
60 unsigned long nr_segs, loff_t pos)
62 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
65 * If we have encountered a bitmap-format file, the size limit
66 * is smaller than s_maxbytes, which is for extent-mapped files.
69 if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
70 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
71 size_t length = iov_length(iov, nr_segs);
73 if (pos > sbi->s_bitmap_maxbytes)
76 if (pos + length > sbi->s_bitmap_maxbytes) {
77 nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
78 sbi->s_bitmap_maxbytes - pos);
82 return generic_file_aio_write(iocb, iov, nr_segs, pos);
85 static const struct vm_operations_struct ext4_file_vm_ops = {
86 .fault = filemap_fault,
87 .page_mkwrite = ext4_page_mkwrite,
90 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
92 struct address_space *mapping = file->f_mapping;
94 if (!mapping->a_ops->readpage)
97 vma->vm_ops = &ext4_file_vm_ops;
98 vma->vm_flags |= VM_CAN_NONLINEAR;
102 static int ext4_file_open(struct inode * inode, struct file * filp)
104 struct super_block *sb = inode->i_sb;
105 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
106 struct vfsmount *mnt = filp->f_path.mnt;
110 if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
111 !(sb->s_flags & MS_RDONLY))) {
112 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
114 * Sample where the filesystem has been mounted and
115 * store it in the superblock for sysadmin convenience
116 * when trying to sort through large numbers of block
117 * devices or filesystem images.
119 memset(buf, 0, sizeof(buf));
120 path.mnt = mnt->mnt_parent;
121 path.dentry = mnt->mnt_mountpoint;
123 cp = d_path(&path, buf, sizeof(buf));
126 memcpy(sbi->s_es->s_last_mounted, cp,
127 sizeof(sbi->s_es->s_last_mounted));
131 return dquot_file_open(inode, filp);
134 const struct file_operations ext4_file_operations = {
135 .llseek = generic_file_llseek,
136 .read = do_sync_read,
137 .write = do_sync_write,
138 .aio_read = generic_file_aio_read,
139 .aio_write = ext4_file_write,
140 .unlocked_ioctl = ext4_ioctl,
142 .compat_ioctl = ext4_compat_ioctl,
144 .mmap = ext4_file_mmap,
145 .open = ext4_file_open,
146 .release = ext4_release_file,
147 .fsync = ext4_sync_file,
148 .splice_read = generic_file_splice_read,
149 .splice_write = generic_file_splice_write,
152 const struct inode_operations ext4_file_inode_operations = {
153 .truncate = ext4_truncate,
154 .setattr = ext4_setattr,
155 .getattr = ext4_getattr,
156 #ifdef CONFIG_EXT4_FS_XATTR
157 .setxattr = generic_setxattr,
158 .getxattr = generic_getxattr,
159 .listxattr = ext4_listxattr,
160 .removexattr = generic_removexattr,
162 .check_acl = ext4_check_acl,
163 .fallocate = ext4_fallocate,
164 .fiemap = ext4_fiemap,