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, loff_t start, loff_t end, int datasync) 32 { 33 struct inode *inode = file->f_mapping->host; 34 int rc = 0; 35 36 rc = filemap_write_and_wait_range(inode->i_mapping, start, end); 37 if (rc) 38 return rc; 39 40 mutex_lock(&inode->i_mutex); 41 if (!(inode->i_state & I_DIRTY) || 42 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) { 43 /* Make sure committed changes hit the disk */ 44 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1); 45 mutex_unlock(&inode->i_mutex); 46 return rc; 47 } 48 49 rc |= jfs_commit_inode(inode, 1); 50 mutex_unlock(&inode->i_mutex); 51 52 return rc ? -EIO : 0; 53 } 54 55 static int jfs_open(struct inode *inode, struct file *file) 56 { 57 int rc; 58 59 if ((rc = dquot_file_open(inode, file))) 60 return rc; 61 62 /* 63 * We attempt to allow only one "active" file open per aggregate 64 * group. Otherwise, appending to files in parallel can cause 65 * fragmentation within the files. 66 * 67 * If the file is empty, it was probably just created and going 68 * to be written to. If it has a size, we'll hold off until the 69 * file is actually grown. 70 */ 71 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE && 72 (inode->i_size == 0)) { 73 struct jfs_inode_info *ji = JFS_IP(inode); 74 spin_lock_irq(&ji->ag_lock); 75 if (ji->active_ag == -1) { 76 struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb); 77 ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb); 78 atomic_inc( &jfs_sb->bmap->db_active[ji->active_ag]); 79 } 80 spin_unlock_irq(&ji->ag_lock); 81 } 82 83 return 0; 84 } 85 static int jfs_release(struct inode *inode, struct file *file) 86 { 87 struct jfs_inode_info *ji = JFS_IP(inode); 88 89 spin_lock_irq(&ji->ag_lock); 90 if (ji->active_ag != -1) { 91 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 92 atomic_dec(&bmap->db_active[ji->active_ag]); 93 ji->active_ag = -1; 94 } 95 spin_unlock_irq(&ji->ag_lock); 96 97 return 0; 98 } 99 100 int jfs_setattr(struct dentry *dentry, struct iattr *iattr) 101 { 102 struct inode *inode = dentry->d_inode; 103 int rc; 104 105 rc = inode_change_ok(inode, iattr); 106 if (rc) 107 return rc; 108 109 if (is_quota_modification(inode, iattr)) 110 dquot_initialize(inode); 111 if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) || 112 (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) { 113 rc = dquot_transfer(inode, iattr); 114 if (rc) 115 return rc; 116 } 117 118 if ((iattr->ia_valid & ATTR_SIZE) && 119 iattr->ia_size != i_size_read(inode)) { 120 inode_dio_wait(inode); 121 122 rc = inode_newsize_ok(inode, iattr->ia_size); 123 if (rc) 124 return rc; 125 126 truncate_setsize(inode, iattr->ia_size); 127 jfs_truncate(inode); 128 } 129 130 setattr_copy(inode, iattr); 131 mark_inode_dirty(inode); 132 133 if (iattr->ia_valid & ATTR_MODE) 134 rc = jfs_acl_chmod(inode); 135 return rc; 136 } 137 138 const struct inode_operations jfs_file_inode_operations = { 139 .setxattr = jfs_setxattr, 140 .getxattr = jfs_getxattr, 141 .listxattr = jfs_listxattr, 142 .removexattr = jfs_removexattr, 143 .setattr = jfs_setattr, 144 #ifdef CONFIG_JFS_POSIX_ACL 145 .get_acl = jfs_get_acl, 146 #endif 147 }; 148 149 const struct file_operations jfs_file_operations = { 150 .open = jfs_open, 151 .llseek = generic_file_llseek, 152 .write = do_sync_write, 153 .read = do_sync_read, 154 .aio_read = generic_file_aio_read, 155 .aio_write = generic_file_aio_write, 156 .mmap = generic_file_mmap, 157 .splice_read = generic_file_splice_read, 158 .splice_write = generic_file_splice_write, 159 .fsync = jfs_fsync, 160 .release = jfs_release, 161 .unlocked_ioctl = jfs_ioctl, 162 #ifdef CONFIG_COMPAT 163 .compat_ioctl = jfs_compat_ioctl, 164 #endif 165 }; 166