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_debug.h" 26 27 28extern int jfs_commit_inode(struct inode *, int); 29 30int jfs_fsync(struct file *file, struct dentry *dentry, int datasync) 31{ 32 struct inode *inode = dentry->d_inode; 33 int rc = 0; 34 35 rc = fsync_inode_data_buffers(inode); 36 37 if (!(inode->i_state & I_DIRTY)) 38 return rc; 39 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) 40 return rc; 41 42 rc |= jfs_commit_inode(inode, 1); 43 44 return rc ? -EIO : 0; 45} 46 47/* 48 * Guts of jfs_truncate. Called with locks already held. Can be called 49 * with directory for truncating directory index table. 50 */ 51void jfs_truncate_nolock(struct inode *ip, loff_t length) 52{ 53 loff_t newsize; 54 tid_t tid; 55 56 ASSERT(length >= 0); 57 58 if (test_cflag(COMMIT_Nolink, ip)) { 59 xtTruncate(0, ip, length, COMMIT_WMAP); 60 return; 61 } 62 63 do { 64 tid = txBegin(ip->i_sb, 0); 65 66 /* 67 * The commit_sem cannot be taken before txBegin. 68 * txBegin may block and there is a chance the inode 69 * could be marked dirty and need to be committed 70 * before txBegin unblocks 71 */ 72 down(&JFS_IP(ip)->commit_sem); 73 74 newsize = xtTruncate(tid, ip, length, 75 COMMIT_TRUNCATE | COMMIT_PWMAP); 76 if (newsize < 0) { 77 txEnd(tid); 78 up(&JFS_IP(ip)->commit_sem); 79 break; 80 } 81 82 ip->i_mtime = ip->i_ctime = CURRENT_TIME; 83 mark_inode_dirty(ip); 84 85 txCommit(tid, 1, &ip, 0); 86 txEnd(tid); 87 up(&JFS_IP(ip)->commit_sem); 88 } while (newsize > length); /* Truncate isn't always atomic */ 89} 90 91static void jfs_truncate(struct inode *ip) 92{ 93 jFYI(1, ("jfs_truncate: size = 0x%lx\n", (ulong) ip->i_size)); 94 95 IWRITE_LOCK(ip); 96 jfs_truncate_nolock(ip, ip->i_size); 97 IWRITE_UNLOCK(ip); 98} 99 100static int jfs_open(struct inode *inode, struct file *file) 101{ 102 int rc; 103 104 if ((rc = generic_file_open(inode, file))) 105 return rc; 106 107 /* 108 * We attempt to allow only one "active" file open per aggregate 109 * group. Otherwise, appending to files in parallel can cause 110 * fragmentation within the files. 111 * 112 * If the file is empty, it was probably just created and going 113 * to be written to. If it has a size, we'll hold off until the 114 * file is actually grown. 115 */ 116 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE && 117 (inode->i_size == 0)) { 118 struct jfs_inode_info *ji = JFS_IP(inode); 119 if (ji->active_ag == -1) { 120 ji->active_ag = ji->agno; 121 atomic_inc( 122 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]); 123 } 124 } 125 126 return 0; 127} 128static int jfs_release(struct inode *inode, struct file *file) 129{ 130 struct jfs_inode_info *ji = JFS_IP(inode); 131 132 if (ji->active_ag != -1) { 133 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 134 atomic_dec(&bmap->db_active[ji->active_ag]); 135 ji->active_ag = -1; 136 } 137 138 return 0; 139} 140 141struct inode_operations jfs_file_inode_operations = { 142 .truncate = jfs_truncate, 143 .setxattr = jfs_setxattr, 144 .getxattr = jfs_getxattr, 145 .listxattr = jfs_listxattr, 146 .removexattr = jfs_removexattr, 147}; 148 149struct file_operations jfs_file_operations = { 150 .open = jfs_open, 151 .llseek = generic_file_llseek, 152 .write = generic_file_write, 153 .read = generic_file_read, 154 .mmap = generic_file_mmap, 155 .fsync = jfs_fsync, 156 .release = jfs_release, 157}; 158