fs/jfs/file.c

   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 };