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/mm.h> 21 #include <linux/fs.h> 22 #include <linux/quotaops.h> 23 #include "jfs_incore.h" 24 #include "jfs_inode.h" 25 #include "jfs_dmap.h" 26 #include "jfs_txnmgr.h" 27 #include "jfs_xattr.h" 28 #include "jfs_acl.h" 29 #include "jfs_debug.h" 30 31 int jfs_fsync(struct file *file, int datasync) 32 { 33 struct inode *inode = file->f_mapping->host; 34 int rc = 0; 35 36 if (!(inode->i_state & I_DIRTY) || 37 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) { 38 /* Make sure committed changes hit the disk */ 39 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1); 40 return rc; 41 } 42 43 rc |= jfs_commit_inode(inode, 1); 44 45 return rc ? -EIO : 0; 46 } 47 48 static int jfs_open(struct inode *inode, struct file *file) 49 { 50 int rc; 51 52 if ((rc = dquot_file_open(inode, file))) 53 return rc; 54 55 /* 56 * We attempt to allow only one "active" file open per aggregate 57 * group. Otherwise, appending to files in parallel can cause 58 * fragmentation within the files. 59 * 60 * If the file is empty, it was probably just created and going 61 * to be written to. If it has a size, we'll hold off until the 62 * file is actually grown. 63 */ 64 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE && 65 (inode->i_size == 0)) { 66 struct jfs_inode_info *ji = JFS_IP(inode); 67 spin_lock_irq(&ji->ag_lock); 68 if (ji->active_ag == -1) { 69 ji->active_ag = ji->agno; 70 atomic_inc( 71 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]); 72 } 73 spin_unlock_irq(&ji->ag_lock); 74 } 75 76 return 0; 77 } 78 static int jfs_release(struct inode *inode, struct file *file) 79 { 80 struct jfs_inode_info *ji = JFS_IP(inode); 81 82 spin_lock_irq(&ji->ag_lock); 83 if (ji->active_ag != -1) { 84 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 85 atomic_dec(&bmap->db_active[ji->active_ag]); 86 ji->active_ag = -1; 87 } 88 spin_unlock_irq(&ji->ag_lock); 89 90 return 0; 91 } 92 93 int jfs_setattr(struct dentry *dentry, struct iattr *iattr) 94 { 95 struct inode *inode = dentry->d_inode; 96 int rc; 97 98 rc = inode_change_ok(inode, iattr); 99 if (rc) 100 return rc; 101 102 if (is_quota_modification(inode, iattr)) 103 dquot_initialize(inode); 104 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || 105 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { 106 rc = dquot_transfer(inode, iattr); 107 if (rc) 108 return rc; 109 } 110 111 if ((iattr->ia_valid & ATTR_SIZE) && 112 iattr->ia_size != i_size_read(inode)) { 113 rc = vmtruncate(inode, iattr->ia_size); 114 if (rc) 115 return rc; 116 } 117 118 setattr_copy(inode, iattr); 119 mark_inode_dirty(inode); 120 121 if (iattr->ia_valid & ATTR_MODE) 122 rc = jfs_acl_chmod(inode); 123 return rc; 124 } 125 126 const struct inode_operations jfs_file_inode_operations = { 127 .truncate = jfs_truncate, 128 .setxattr = jfs_setxattr, 129 .getxattr = jfs_getxattr, 130 .listxattr = jfs_listxattr, 131 .removexattr = jfs_removexattr, 132 .setattr = jfs_setattr, 133 #ifdef CONFIG_JFS_POSIX_ACL 134 .check_acl = jfs_check_acl, 135 #endif 136 }; 137 138 const struct file_operations jfs_file_operations = { 139 .open = jfs_open, 140 .llseek = generic_file_llseek, 141 .write = do_sync_write, 142 .read = do_sync_read, 143 .aio_read = generic_file_aio_read, 144 .aio_write = generic_file_aio_write, 145 .mmap = generic_file_mmap, 146 .splice_read = generic_file_splice_read, 147 .splice_write = generic_file_splice_write, 148 .fsync = jfs_fsync, 149 .release = jfs_release, 150 .unlocked_ioctl = jfs_ioctl, 151 #ifdef CONFIG_COMPAT 152 .compat_ioctl = jfs_compat_ioctl, 153 #endif 154 }; 155