fs/jfs/file.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *   Copyright (C) International Business Machines Corp., 2000-2002
0004  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
0005  */
0006
0007 #include <linux/mm.h>
0008 #include <linux/fs.h>
0009 #include <linux/posix_acl.h>
0010 #include <linux/quotaops.h>
0011 #include "jfs_incore.h"
0012 #include "jfs_inode.h"
0013 #include "jfs_dmap.h"
0014 #include "jfs_txnmgr.h"
0015 #include "jfs_xattr.h"
0016 #include "jfs_acl.h"
0017 #include "jfs_debug.h"
0018
0019 int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
0020 {
0021     struct inode *inode = file->f_mapping->host;
0022     int rc = 0;
0023
0024     rc = file_write_and_wait_range(file, start, end);
0025     if (rc)
0026         return rc;
0027
0028     inode_lock(inode);
0029     if (!(inode->i_state & I_DIRTY_ALL) ||
0030         (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
0031         /* Make sure committed changes hit the disk */
0032         jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
0033         inode_unlock(inode);
0034         return rc;
0035     }
0036
0037     rc |= jfs_commit_inode(inode, 1);
0038     inode_unlock(inode);
0039
0040     return rc ? -EIO : 0;
0041 }
0042
0043 static int jfs_open(struct inode *inode, struct file *file)
0044 {
0045     int rc;
0046
0047     if ((rc = dquot_file_open(inode, file)))
0048         return rc;
0049
0050     /*
0051      * We attempt to allow only one "active" file open per aggregate
0052      * group.  Otherwise, appending to files in parallel can cause
0053      * fragmentation within the files.
0054      *
0055      * If the file is empty, it was probably just created and going
0056      * to be written to.  If it has a size, we'll hold off until the
0057      * file is actually grown.
0058      */
0059     if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
0060         (inode->i_size == 0)) {
0061         struct jfs_inode_info *ji = JFS_IP(inode);
0062         spin_lock_irq(&ji->ag_lock);
0063         if (ji->active_ag == -1) {
0064             struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
0065             ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
0066             atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
0067         }
0068         spin_unlock_irq(&ji->ag_lock);
0069     }
0070
0071     return 0;
0072 }
0073 static int jfs_release(struct inode *inode, struct file *file)
0074 {
0075     struct jfs_inode_info *ji = JFS_IP(inode);
0076
0077     spin_lock_irq(&ji->ag_lock);
0078     if (ji->active_ag != -1) {
0079         struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
0080         atomic_dec(&bmap->db_active[ji->active_ag]);
0081         ji->active_ag = -1;
0082     }
0083     spin_unlock_irq(&ji->ag_lock);
0084
0085     return 0;
0086 }
0087
0088 int jfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
0089         struct iattr *iattr)
0090 {
0091     struct inode *inode = d_inode(dentry);
0092     int rc;
0093
0094     rc = setattr_prepare(&init_user_ns, dentry, iattr);
0095     if (rc)
0096         return rc;
0097
0098     if (is_quota_modification(mnt_userns, inode, iattr)) {
0099         rc = dquot_initialize(inode);
0100         if (rc)
0101             return rc;
0102     }
0103     if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
0104         (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
0105         rc = dquot_transfer(mnt_userns, inode, iattr);
0106         if (rc)
0107             return rc;
0108     }
0109
0110     if ((iattr->ia_valid & ATTR_SIZE) &&
0111         iattr->ia_size != i_size_read(inode)) {
0112         inode_dio_wait(inode);
0113
0114         rc = inode_newsize_ok(inode, iattr->ia_size);
0115         if (rc)
0116             return rc;
0117
0118         truncate_setsize(inode, iattr->ia_size);
0119         jfs_truncate(inode);
0120     }
0121
0122     setattr_copy(&init_user_ns, inode, iattr);
0123     mark_inode_dirty(inode);
0124
0125     if (iattr->ia_valid & ATTR_MODE)
0126         rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
0127     return rc;
0128 }
0129
0130 const struct inode_operations jfs_file_inode_operations = {
0131     .listxattr  = jfs_listxattr,
0132     .setattr    = jfs_setattr,
0133     .fileattr_get   = jfs_fileattr_get,
0134     .fileattr_set   = jfs_fileattr_set,
0135 #ifdef CONFIG_JFS_POSIX_ACL
0136     .get_acl    = jfs_get_acl,
0137     .set_acl    = jfs_set_acl,
0138 #endif
0139 };
0140
0141 const struct file_operations jfs_file_operations = {
0142     .open       = jfs_open,
0143     .llseek     = generic_file_llseek,
0144     .read_iter  = generic_file_read_iter,
0145     .write_iter = generic_file_write_iter,
0146     .mmap       = generic_file_mmap,
0147     .splice_read    = generic_file_splice_read,
0148     .splice_write   = iter_file_splice_write,
0149     .fsync      = jfs_fsync,
0150     .release    = jfs_release,
0151     .unlocked_ioctl = jfs_ioctl,
0152     .compat_ioctl   = compat_ptr_ioctl,
0153 };