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_inode.h" 23 #include "jfs_dmap.h" 24 #include "jfs_txnmgr.h" 25 #include "jfs_xattr.h" 26 #include "jfs_acl.h" 27 #include "jfs_debug.h" 28 29 int jfs_fsync(struct file *file, struct dentry *dentry, int datasync) 30 { 31 struct inode *inode = dentry->d_inode; 32 int rc = 0; 33 34 if (!(inode->i_state & I_DIRTY) || 35 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) { 36 /* Make sure committed changes hit the disk */ 37 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1); 38 return rc; 39 } 40 41 rc |= jfs_commit_inode(inode, 1); 42 43 return rc ? -EIO : 0; 44 } 45 46 static int jfs_open(struct inode *inode, struct file *file) 47 { 48 int rc; 49 50 if ((rc = generic_file_open(inode, file))) 51 return rc; 52 53 /* 54 * We attempt to allow only one "active" file open per aggregate 55 * group. Otherwise, appending to files in parallel can cause 56 * fragmentation within the files. 57 * 58 * If the file is empty, it was probably just created and going 59 * to be written to. If it has a size, we'll hold off until the 60 * file is actually grown. 61 */ 62 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE && 63 (inode->i_size == 0)) { 64 struct jfs_inode_info *ji = JFS_IP(inode); 65 spin_lock_irq(&ji->ag_lock); 66 if (ji->active_ag == -1) { 67 ji->active_ag = ji->agno; 68 atomic_inc( 69 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]); 70 } 71 spin_unlock_irq(&ji->ag_lock); 72 } 73 74 return 0; 75 } 76 static int jfs_release(struct inode *inode, struct file *file) 77 { 78 struct jfs_inode_info *ji = JFS_IP(inode); 79 80 spin_lock_irq(&ji->ag_lock); 81 if (ji->active_ag != -1) { 82 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 83 atomic_dec(&bmap->db_active[ji->active_ag]); 84 ji->active_ag = -1; 85 } 86 spin_unlock_irq(&ji->ag_lock); 87 88 return 0; 89 } 90 91 const struct inode_operations jfs_file_inode_operations = { 92 .truncate = jfs_truncate, 93 .setxattr = jfs_setxattr, 94 .getxattr = jfs_getxattr, 95 .listxattr = jfs_listxattr, 96 .removexattr = jfs_removexattr, 97 #ifdef CONFIG_JFS_POSIX_ACL 98 .setattr = jfs_setattr, 99 .permission = jfs_permission, 100 #endif 101 }; 102 103 const struct file_operations jfs_file_operations = { 104 .open = jfs_open, 105 .llseek = generic_file_llseek, 106 .write = do_sync_write, 107 .read = do_sync_read, 108 .aio_read = generic_file_aio_read, 109 .aio_write = generic_file_aio_write, 110 .mmap = generic_file_mmap, 111 .sendfile = generic_file_sendfile, 112 .splice_read = generic_file_splice_read, 113 .splice_write = generic_file_splice_write, 114 .fsync = jfs_fsync, 115 .release = jfs_release, 116 .ioctl = jfs_ioctl, 117 }; 118