1 /* 2 * Copyright (c) International Business Machines Corp., 2000-2002 3 * Portions Copyright (c) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/fs.h> 21 #include "jfs_incore.h" 22 #include "jfs_dmap.h" 23 #include "jfs_txnmgr.h" 24 #include "jfs_xattr.h" 25 #include "jfs_acl.h" 26 #include "jfs_debug.h" 27 28 29 extern int jfs_commit_inode(struct inode *, int); 30 extern void jfs_truncate(struct inode *); 31 32 int jfs_fsync(struct file *file, struct dentry *dentry, int datasync) 33 { 34 struct inode *inode = dentry->d_inode; 35 int rc = 0; 36 37 if (!(inode->i_state & I_DIRTY) || 38 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) { 39 /* Make sure committed changes hit the disk */ 40 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1); 41 return rc; 42 } 43 44 rc |= jfs_commit_inode(inode, 1); 45 46 return rc ? -EIO : 0; 47 } 48 49 static int jfs_open(struct inode *inode, struct file *file) 50 { 51 int rc; 52 53 if ((rc = generic_file_open(inode, file))) 54 return rc; 55 56 /* 57 * We attempt to allow only one "active" file open per aggregate 58 * group. Otherwise, appending to files in parallel can cause 59 * fragmentation within the files. 60 * 61 * If the file is empty, it was probably just created and going 62 * to be written to. If it has a size, we'll hold off until the 63 * file is actually grown. 64 */ 65 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE && 66 (inode->i_size == 0)) { 67 struct jfs_inode_info *ji = JFS_IP(inode); 68 spin_lock_irq(&ji->ag_lock); 69 if (ji->active_ag == -1) { 70 ji->active_ag = ji->agno; 71 atomic_inc( 72 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]); 73 } 74 spin_unlock_irq(&ji->ag_lock); 75 } 76 77 return 0; 78 } 79 static int jfs_release(struct inode *inode, struct file *file) 80 { 81 struct jfs_inode_info *ji = JFS_IP(inode); 82 83 spin_lock_irq(&ji->ag_lock); 84 if (ji->active_ag != -1) { 85 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 86 atomic_dec(&bmap->db_active[ji->active_ag]); 87 ji->active_ag = -1; 88 } 89 spin_unlock_irq(&ji->ag_lock); 90 91 return 0; 92 } 93 94 struct inode_operations jfs_file_inode_operations = { 95 .truncate = jfs_truncate, 96 .setxattr = jfs_setxattr, 97 .getxattr = jfs_getxattr, 98 .listxattr = jfs_listxattr, 99 .removexattr = jfs_removexattr, 100 #ifdef CONFIG_JFS_POSIX_ACL 101 .setattr = jfs_setattr, 102 .permission = jfs_permission, 103 #endif 104 }; 105 106 struct file_operations jfs_file_operations = { 107 .open = jfs_open, 108 .llseek = generic_file_llseek, 109 .write = generic_file_write, 110 .read = generic_file_read, 111 .aio_read = generic_file_aio_read, 112 .aio_write = generic_file_aio_write, 113 .mmap = generic_file_mmap, 114 .readv = generic_file_readv, 115 .writev = generic_file_writev, 116 .sendfile = generic_file_sendfile, 117 .fsync = jfs_fsync, 118 .release = jfs_release, 119 }; 120