Root/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
31int jfs_fsync(struct file *file, int datasync)
32{
33    struct inode *inode = file->f_mapping->host;
34    int rc = 0;
35
36    if (!(inode->i_state & I_DIRTY) ||
37        (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
38        /* Make sure committed changes hit the disk */
39        jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
40        return rc;
41    }
42
43    rc |= jfs_commit_inode(inode, 1);
44
45    return rc ? -EIO : 0;
46}
47
48static int jfs_open(struct inode *inode, struct file *file)
49{
50    int rc;
51
52    if ((rc = dquot_file_open(inode, file)))
53        return rc;
54
55    /*
56     * We attempt to allow only one "active" file open per aggregate
57     * group. Otherwise, appending to files in parallel can cause
58     * fragmentation within the files.
59     *
60     * If the file is empty, it was probably just created and going
61     * to be written to. If it has a size, we'll hold off until the
62     * file is actually grown.
63     */
64    if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
65        (inode->i_size == 0)) {
66        struct jfs_inode_info *ji = JFS_IP(inode);
67        spin_lock_irq(&ji->ag_lock);
68        if (ji->active_ag == -1) {
69            struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
70            ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
71            atomic_inc( &jfs_sb->bmap->db_active[ji->active_ag]);
72        }
73        spin_unlock_irq(&ji->ag_lock);
74    }
75
76    return 0;
77}
78static int jfs_release(struct inode *inode, struct file *file)
79{
80    struct jfs_inode_info *ji = JFS_IP(inode);
81
82    spin_lock_irq(&ji->ag_lock);
83    if (ji->active_ag != -1) {
84        struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
85        atomic_dec(&bmap->db_active[ji->active_ag]);
86        ji->active_ag = -1;
87    }
88    spin_unlock_irq(&ji->ag_lock);
89
90    return 0;
91}
92
93int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
94{
95    struct inode *inode = dentry->d_inode;
96    int rc;
97
98    rc = inode_change_ok(inode, iattr);
99    if (rc)
100        return rc;
101
102    if (is_quota_modification(inode, iattr))
103        dquot_initialize(inode);
104    if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
105        (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
106        rc = dquot_transfer(inode, iattr);
107        if (rc)
108            return rc;
109    }
110
111    if ((iattr->ia_valid & ATTR_SIZE) &&
112        iattr->ia_size != i_size_read(inode)) {
113        rc = vmtruncate(inode, iattr->ia_size);
114        if (rc)
115            return rc;
116    }
117
118    setattr_copy(inode, iattr);
119    mark_inode_dirty(inode);
120
121    if (iattr->ia_valid & ATTR_MODE)
122        rc = jfs_acl_chmod(inode);
123    return rc;
124}
125
126const struct inode_operations jfs_file_inode_operations = {
127    .truncate = jfs_truncate,
128    .setxattr = jfs_setxattr,
129    .getxattr = jfs_getxattr,
130    .listxattr = jfs_listxattr,
131    .removexattr = jfs_removexattr,
132    .setattr = jfs_setattr,
133#ifdef CONFIG_JFS_POSIX_ACL
134    .check_acl = jfs_check_acl,
135#endif
136};
137
138const struct file_operations jfs_file_operations = {
139    .open = jfs_open,
140    .llseek = generic_file_llseek,
141    .write = do_sync_write,
142    .read = do_sync_read,
143    .aio_read = generic_file_aio_read,
144    .aio_write = generic_file_aio_write,
145    .mmap = generic_file_mmap,
146    .splice_read = generic_file_splice_read,
147    .splice_write = generic_file_splice_write,
148    .fsync = jfs_fsync,
149    .release = jfs_release,
150    .unlocked_ioctl = jfs_ioctl,
151#ifdef CONFIG_COMPAT
152    .compat_ioctl = jfs_compat_ioctl,
153#endif
154};
155

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