LXR linux/fs/jfs/file.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *   Copyright (C) International Business Machines Corp., 2000-2002
   4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   5 */
   6
   7#include <linux/mm.h>
   8#include <linux/fs.h>
   9#include <linux/posix_acl.h>
  10#include <linux/quotaops.h>
  11#include "jfs_incore.h"
  12#include "jfs_inode.h"
  13#include "jfs_dmap.h"
  14#include "jfs_txnmgr.h"
  15#include "jfs_xattr.h"
  16#include "jfs_acl.h"
  17#include "jfs_debug.h"
  18
  19int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
  20{
  21        struct inode *inode = file->f_mapping->host;
  22        int rc = 0;
  23
  24        rc = file_write_and_wait_range(file, start, end);
  25        if (rc)
  26                return rc;
  27
  28        inode_lock(inode);
  29        if (!(inode->i_state & I_DIRTY_ALL) ||
  30            (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  31                /* Make sure committed changes hit the disk */
  32                jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
  33                inode_unlock(inode);
  34                return rc;
  35        }
  36
  37        rc |= jfs_commit_inode(inode, 1);
  38        inode_unlock(inode);
  39
  40        return rc ? -EIO : 0;
  41}
  42
  43static int jfs_open(struct inode *inode, struct file *file)
  44{
  45        int rc;
  46
  47        if ((rc = dquot_file_open(inode, file)))
  48                return rc;
  49
  50        /*
  51         * We attempt to allow only one "active" file open per aggregate
  52         * group.  Otherwise, appending to files in parallel can cause
  53         * fragmentation within the files.
  54         *
  55         * If the file is empty, it was probably just created and going
  56         * to be written to.  If it has a size, we'll hold off until the
  57         * file is actually grown.
  58         */
  59        if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  60            (inode->i_size == 0)) {
  61                struct jfs_inode_info *ji = JFS_IP(inode);
  62                spin_lock_irq(&ji->ag_lock);
  63                if (ji->active_ag == -1) {
  64                        struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
  65                        ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
  66                        atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
  67                }
  68                spin_unlock_irq(&ji->ag_lock);
  69        }
  70
  71        return 0;
  72}
  73static int jfs_release(struct inode *inode, struct file *file)
  74{
  75        struct jfs_inode_info *ji = JFS_IP(inode);
  76
  77        spin_lock_irq(&ji->ag_lock);
  78        if (ji->active_ag != -1) {
  79                struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  80                atomic_dec(&bmap->db_active[ji->active_ag]);
  81                ji->active_ag = -1;
  82        }
  83        spin_unlock_irq(&ji->ag_lock);
  84
  85        return 0;
  86}
  87
  88int jfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
  89                struct iattr *iattr)
  90{
  91        struct inode *inode = d_inode(dentry);
  92        int rc;
  93
  94        rc = setattr_prepare(&init_user_ns, dentry, iattr);
  95        if (rc)
  96                return rc;
  97
  98        if (is_quota_modification(inode, iattr)) {
  99                rc = dquot_initialize(inode);
 100                if (rc)
 101                        return rc;
 102        }
 103        if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
 104            (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
 105                rc = dquot_transfer(inode, iattr);
 106                if (rc)
 107                        return rc;
 108        }
 109
 110        if ((iattr->ia_valid & ATTR_SIZE) &&
 111            iattr->ia_size != i_size_read(inode)) {
 112                inode_dio_wait(inode);
 113
 114                rc = inode_newsize_ok(inode, iattr->ia_size);
 115                if (rc)
 116                        return rc;
 117
 118                truncate_setsize(inode, iattr->ia_size);
 119                jfs_truncate(inode);
 120        }
 121
 122        setattr_copy(&init_user_ns, inode, iattr);
 123        mark_inode_dirty(inode);
 124
 125        if (iattr->ia_valid & ATTR_MODE)
 126                rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 127        return rc;
 128}
 129
 130const struct inode_operations jfs_file_inode_operations = {
 131        .listxattr      = jfs_listxattr,
 132        .setattr        = jfs_setattr,
 133#ifdef CONFIG_JFS_POSIX_ACL
 134        .get_acl        = jfs_get_acl,
 135        .set_acl        = jfs_set_acl,
 136#endif
 137};
 138
 139const struct file_operations jfs_file_operations = {
 140        .open           = jfs_open,
 141        .llseek         = generic_file_llseek,
 142        .read_iter      = generic_file_read_iter,
 143        .write_iter     = generic_file_write_iter,
 144        .mmap           = generic_file_mmap,
 145        .splice_read    = generic_file_splice_read,
 146        .splice_write   = iter_file_splice_write,
 147        .fsync          = jfs_fsync,
 148        .release        = jfs_release,
 149        .unlocked_ioctl = jfs_ioctl,
 150#ifdef CONFIG_COMPAT
 151        .compat_ioctl   = jfs_compat_ioctl,
 152#endif
 153};
 154