Linux Kernel  3.7.1
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file.c
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1 /*
2  * linux/fs/ext2/file.c
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card ([email protected])
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
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 /*
29  * Called when filp is released. This happens when all file descriptors
30  * for a single struct file are closed. Note that different open() calls
31  * for the same file yield different struct file structures.
32  */
33 static int ext2_release_file (struct inode * inode, struct file * filp)
34 {
35  if (filp->f_mode & FMODE_WRITE) {
36  mutex_lock(&EXT2_I(inode)->truncate_mutex);
38  mutex_unlock(&EXT2_I(inode)->truncate_mutex);
39  }
40  return 0;
41 }
42 
43 int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
44 {
45  int ret;
46  struct super_block *sb = file->f_mapping->host->i_sb;
47  struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
48 
49  ret = generic_file_fsync(file, start, end, datasync);
50  if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
51  /* We don't really know where the IO error happened... */
52  ext2_error(sb, __func__,
53  "detected IO error when writing metadata buffers");
54  ret = -EIO;
55  }
56  return ret;
57 }
58 
59 /*
60  * We have mostly NULL's here: the current defaults are ok for
61  * the ext2 filesystem.
62  */
64  .llseek = generic_file_llseek,
65  .read = do_sync_read,
66  .write = do_sync_write,
67  .aio_read = generic_file_aio_read,
68  .aio_write = generic_file_aio_write,
69  .unlocked_ioctl = ext2_ioctl,
70 #ifdef CONFIG_COMPAT
71  .compat_ioctl = ext2_compat_ioctl,
72 #endif
73  .mmap = generic_file_mmap,
74  .open = dquot_file_open,
75  .release = ext2_release_file,
76  .fsync = ext2_fsync,
77  .splice_read = generic_file_splice_read,
78  .splice_write = generic_file_splice_write,
79 };
80 
81 #ifdef CONFIG_EXT2_FS_XIP
83  .llseek = generic_file_llseek,
84  .read = xip_file_read,
85  .write = xip_file_write,
86  .unlocked_ioctl = ext2_ioctl,
87 #ifdef CONFIG_COMPAT
88  .compat_ioctl = ext2_compat_ioctl,
89 #endif
90  .mmap = xip_file_mmap,
91  .open = dquot_file_open,
92  .release = ext2_release_file,
93  .fsync = ext2_fsync,
94 };
95 #endif
96 
98 #ifdef CONFIG_EXT2_FS_XATTR
99  .setxattr = generic_setxattr,
100  .getxattr = generic_getxattr,
101  .listxattr = ext2_listxattr,
102  .removexattr = generic_removexattr,
103 #endif
104  .setattr = ext2_setattr,
105  .get_acl = ext2_get_acl,
106  .fiemap = ext2_fiemap,
107 };