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| 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 | */ | |||
| 3083E3 | 0 | 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) && | |||
| 2266E3 | 817063 | 38 | (atomic_read(&inode->i_writecount) == 1)) | |
| 2266E3 | 38 | (T) && (T) | ||
| 1231 | 38 | (T) && (F) | ||
| 815832 | 38 | (F) && (_) | ||
| 39 | { | |||
| 40 | down(&EXT3_I(inode)->truncate_sem); | |||
| 41 | ext3_discard_reservation(inode); | |||
| 42 | up(&EXT3_I(inode)->truncate_sem); | |||
| 43 | } | |||
| 0 | 3083E3 | - | 44 | if (is_dx(inode) && filp->private_data) |
| 0 | - | 44 | ((T) && (T)) && T | |
| 0 | - | 44 | ((T) && (T)) && F | |
| 0 | - | 44 | ((T) && (F)) && _ | |
| 3083E3 | 44 | ((F) && (_)) && _ | ||
| 45 | ext3_htree_free_dir_info(filp->private_data); | |||
| 46 | ||||
| 3083E3 | 47 | return 0; | ||
| 48 | } | |||
| 49 | ||||
| 50 | static ssize_t | |||
| 5011E3 | 0 | 51 | ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos) | |
| 52 | { | |||
| 53 | struct file *file = iocb->ki_filp; | |||
| 54 | struct inode *inode = file->f_dentry->d_inode; | |||
| 55 | ssize_t ret; | |||
| 56 | int err; | |||
| 57 | ||||
| 58 | ret = generic_file_aio_write(iocb, buf, count, pos); | |||
| 59 | ||||
| 60 | /* | |||
| 61 | * Skip flushing if there was an error, or if nothing was written. | |||
| 62 | */ | |||
| 153459 | 4858E3 | 63 | if (ret <= 0) | |
| 153459 | 64 | return ret; | ||
| 65 | ||||
| 66 | /* | |||
| 67 | * If the inode is IS_SYNC, or is O_SYNC and we are doing data | |||
| 68 | * journalling then we need to make sure that we force the transaction | |||
| 69 | * to disk to keep all metadata uptodate synchronously. | |||
| 70 | */ | |||
| 20653 | 4837E3 | 71 | if (file->f_flags & O_SYNC) { | |
| 72 | /* | |||
| 73 | * If we are non-data-journaled, then the dirty data has | |||
| 74 | * already been flushed to backing store by generic_osync_inode, | |||
| 75 | * and the inode has been flushed too if there have been any | |||
| 76 | * modifications other than mere timestamp updates. | |||
| 77 | * | |||
| 78 | * Open question --- do we care about flushing timestamps too | |||
| 79 | * if the inode is IS_SYNC? | |||
| 80 | */ | |||
| 20653 | 0 | - | 81 | if (!ext3_should_journal_data(inode)) |
| 20653 | 82 | return ret; | ||
| 83 | ||||
| 0 | - | 84 | goto force_commit; | |
| 85 | } | |||
| 86 | ||||
| 87 | /* | |||
| 88 | * So we know that there has been no forced data flush. If the inode | |||
| 89 | * is marked IS_SYNC, we need to force one ourselves. | |||
| 90 | */ | |||
| 4837E3 | 0 | - | 91 | if (!IS_SYNC(inode)) |
| 4837E3 | 91 | !((F) || (F)) | ||
| 0 | - | 91 | !((T) || (_)) | |
| 0 | - | 91 | !((F) || (T)) | |
| 4837E3 | 92 | return ret; | ||
| 93 | ||||
| 94 | /* | |||
| 95 | * Open question #2 --- should we force data to disk here too? If we | |||
| 96 | * don't, the only impact is that data=writeback filesystems won't | |||
| 97 | * flush data to disk automatically on IS_SYNC, only metadata (but | |||
| 98 | * historically, that is what ext2 has done.) | |||
| 99 | */ | |||
| 100 | ||||
| 101 | force_commit: | |||
| 102 | err = ext3_force_commit(inode->i_sb); | |||
| 0 | 0 | - | 103 | if (err) |
| 0 | - | 104 | return err; | |
| 0 | - | 105 | return ret; | |
| 106 | } | |||
| 107 | ||||
| 108 | struct file_operations ext3_file_operations = { | |||
| 109 | .llseek = generic_file_llseek, | |||
| 110 | .read = do_sync_read, | |||
| 111 | .write = do_sync_write, | |||
| 112 | .aio_read = generic_file_aio_read, | |||
| 113 | .aio_write = ext3_file_write, | |||
| 114 | .readv = generic_file_readv, | |||
| 115 | .writev = generic_file_writev, | |||
| 116 | .ioctl = ext3_ioctl, | |||
| 117 | .mmap = generic_file_mmap, | |||
| 118 | .open = generic_file_open, | |||
| 119 | .release = ext3_release_file, | |||
| 120 | .fsync = ext3_sync_file, | |||
| 121 | .sendfile = generic_file_sendfile, | |||
| 122 | }; | |||
| 123 | ||||
| 124 | struct inode_operations ext3_file_inode_operations = { | |||
| 125 | .truncate = ext3_truncate, | |||
| 126 | .setattr = ext3_setattr, | |||
| 127 | #ifdef CONFIG_EXT3_FS_XATTR | |||
| 128 | .setxattr = generic_setxattr, | |||
| 129 | .getxattr = generic_getxattr, | |||
| 130 | .listxattr = ext3_listxattr, | |||
| 131 | .removexattr = generic_removexattr, | |||
| 132 | #endif | |||
| 133 | .permission = ext3_permission, | |||
| 134 | }; | |||
| 135 | ||||
| ***TER 61% (20/33) of SOURCE FILE file.c | ||||