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
  19 int 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
  43 static 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 }
  73 static 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
  88 int 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
 130 const 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
 139 const 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 };