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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ext3/file.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/ext3/file.c')
-rw-r--r--fs/ext3/file.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
new file mode 100644
index 000000000000..5ad8cf0292df
--- /dev/null
+++ b/fs/ext3/file.c
@@ -0,0 +1,131 @@
1/*
2 * linux/fs/ext3/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 * ext3 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/fs.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include "xattr.h"
27#include "acl.h"
28
29/*
30 * Called when an inode is released. Note that this is different
31 * from ext3_file_open: open gets called at every open, but release
32 * gets called only when /all/ the files are closed.
33 */
34static int ext3_release_file (struct inode * inode, struct file * filp)
35{
36 /* if we are the last writer on the inode, drop the block reservation */
37 if ((filp->f_mode & FMODE_WRITE) &&
38 (atomic_read(&inode->i_writecount) == 1))
39 ext3_discard_reservation(inode);
40 if (is_dx(inode) && filp->private_data)
41 ext3_htree_free_dir_info(filp->private_data);
42
43 return 0;
44}
45
46static ssize_t
47ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
48{
49 struct file *file = iocb->ki_filp;
50 struct inode *inode = file->f_dentry->d_inode;
51 ssize_t ret;
52 int err;
53
54 ret = generic_file_aio_write(iocb, buf, count, pos);
55
56 /*
57 * Skip flushing if there was an error, or if nothing was written.
58 */
59 if (ret <= 0)
60 return ret;
61
62 /*
63 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
64 * journalling then we need to make sure that we force the transaction
65 * to disk to keep all metadata uptodate synchronously.
66 */
67 if (file->f_flags & O_SYNC) {
68 /*
69 * If we are non-data-journaled, then the dirty data has
70 * already been flushed to backing store by generic_osync_inode,
71 * and the inode has been flushed too if there have been any
72 * modifications other than mere timestamp updates.
73 *
74 * Open question --- do we care about flushing timestamps too
75 * if the inode is IS_SYNC?
76 */
77 if (!ext3_should_journal_data(inode))
78 return ret;
79
80 goto force_commit;
81 }
82
83 /*
84 * So we know that there has been no forced data flush. If the inode
85 * is marked IS_SYNC, we need to force one ourselves.
86 */
87 if (!IS_SYNC(inode))
88 return ret;
89
90 /*
91 * Open question #2 --- should we force data to disk here too? If we
92 * don't, the only impact is that data=writeback filesystems won't
93 * flush data to disk automatically on IS_SYNC, only metadata (but
94 * historically, that is what ext2 has done.)
95 */
96
97force_commit:
98 err = ext3_force_commit(inode->i_sb);
99 if (err)
100 return err;
101 return ret;
102}
103
104struct file_operations ext3_file_operations = {
105 .llseek = generic_file_llseek,
106 .read = do_sync_read,
107 .write = do_sync_write,
108 .aio_read = generic_file_aio_read,
109 .aio_write = ext3_file_write,
110 .readv = generic_file_readv,
111 .writev = generic_file_writev,
112 .ioctl = ext3_ioctl,
113 .mmap = generic_file_mmap,
114 .open = generic_file_open,
115 .release = ext3_release_file,
116 .fsync = ext3_sync_file,
117 .sendfile = generic_file_sendfile,
118};
119
120struct inode_operations ext3_file_inode_operations = {
121 .truncate = ext3_truncate,
122 .setattr = ext3_setattr,
123#ifdef CONFIG_EXT3_FS_XATTR
124 .setxattr = generic_setxattr,
125 .getxattr = generic_getxattr,
126 .listxattr = ext3_listxattr,
127 .removexattr = generic_removexattr,
128#endif
129 .permission = ext3_permission,
130};
131