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TOMOYO Linux Cross Reference
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/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 };
166 

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