linux/fs/jfs/file.c
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   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
  31int 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
  55static 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}
  85static 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
 100int 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 && iattr->ia_uid != inode->i_uid) ||
 112            (iattr->ia_valid & ATTR_GID && 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 = vmtruncate(inode, iattr->ia_size);
 123                if (rc)
 124                        return rc;
 125        }
 126
 127        setattr_copy(inode, iattr);
 128        mark_inode_dirty(inode);
 129
 130        if (iattr->ia_valid & ATTR_MODE)
 131                rc = jfs_acl_chmod(inode);
 132        return rc;
 133}
 134
 135const struct inode_operations jfs_file_inode_operations = {
 136        .truncate       = jfs_truncate,
 137        .setxattr       = jfs_setxattr,
 138        .getxattr       = jfs_getxattr,
 139        .listxattr      = jfs_listxattr,
 140        .removexattr    = jfs_removexattr,
 141        .setattr        = jfs_setattr,
 142#ifdef CONFIG_JFS_POSIX_ACL
 143        .get_acl        = jfs_get_acl,
 144#endif
 145};
 146
 147const struct file_operations jfs_file_operations = {
 148        .open           = jfs_open,
 149        .llseek         = generic_file_llseek,
 150        .write          = do_sync_write,
 151        .read           = do_sync_read,
 152        .aio_read       = generic_file_aio_read,
 153        .aio_write      = generic_file_aio_write,
 154        .mmap           = generic_file_mmap,
 155        .splice_read    = generic_file_splice_read,
 156        .splice_write   = generic_file_splice_write,
 157        .fsync          = jfs_fsync,
 158        .release        = jfs_release,
 159        .unlocked_ioctl = jfs_ioctl,
 160#ifdef CONFIG_COMPAT
 161        .compat_ioctl   = jfs_compat_ioctl,
 162#endif
 163};
 164
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