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