LXR linux/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
  32int 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 = filemap_write_and_wait_range(inode->i_mapping, 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
  56static 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}
  86static 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
 101int 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
 142const 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
 151const 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};
 166