| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 34 | static 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 | |
| 46 | static ssize_t |
| 47 | ext3_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 | |
| 97 | force_commit: |
| 98 | err = ext3_force_commit(inode->i_sb); |
| 99 | if (err) |
| 100 | return err; |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | struct 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 | |
| 120 | struct 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 | |