c1632a0f11
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b42 ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2002
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*/
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/posix_acl.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_inode.h"
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#include "jfs_dmap.h"
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#include "jfs_txnmgr.h"
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#include "jfs_xattr.h"
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#include "jfs_acl.h"
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#include "jfs_debug.h"
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int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct inode *inode = file->f_mapping->host;
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int rc = 0;
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rc = file_write_and_wait_range(file, start, end);
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if (rc)
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return rc;
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inode_lock(inode);
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if (!(inode->i_state & I_DIRTY_ALL) ||
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(datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
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/* Make sure committed changes hit the disk */
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jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
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inode_unlock(inode);
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return rc;
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}
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rc |= jfs_commit_inode(inode, 1);
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inode_unlock(inode);
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return rc ? -EIO : 0;
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}
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static int jfs_open(struct inode *inode, struct file *file)
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{
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int rc;
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if ((rc = dquot_file_open(inode, file)))
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return rc;
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/*
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* We attempt to allow only one "active" file open per aggregate
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* group. Otherwise, appending to files in parallel can cause
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* fragmentation within the files.
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*
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* If the file is empty, it was probably just created and going
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* to be written to. If it has a size, we'll hold off until the
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* file is actually grown.
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*/
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if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
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(inode->i_size == 0)) {
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struct jfs_inode_info *ji = JFS_IP(inode);
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spin_lock_irq(&ji->ag_lock);
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if (ji->active_ag == -1) {
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struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
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ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
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atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
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}
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spin_unlock_irq(&ji->ag_lock);
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}
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return 0;
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}
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static int jfs_release(struct inode *inode, struct file *file)
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{
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struct jfs_inode_info *ji = JFS_IP(inode);
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spin_lock_irq(&ji->ag_lock);
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if (ji->active_ag != -1) {
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struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
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atomic_dec(&bmap->db_active[ji->active_ag]);
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ji->active_ag = -1;
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}
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spin_unlock_irq(&ji->ag_lock);
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return 0;
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}
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int jfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *iattr)
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{
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struct inode *inode = d_inode(dentry);
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int rc;
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rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
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if (rc)
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return rc;
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if (is_quota_modification(&init_user_ns, inode, iattr)) {
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rc = dquot_initialize(inode);
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if (rc)
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return rc;
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}
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if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
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(iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
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rc = dquot_transfer(&init_user_ns, inode, iattr);
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if (rc)
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return rc;
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}
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if ((iattr->ia_valid & ATTR_SIZE) &&
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iattr->ia_size != i_size_read(inode)) {
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inode_dio_wait(inode);
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rc = inode_newsize_ok(inode, iattr->ia_size);
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if (rc)
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return rc;
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truncate_setsize(inode, iattr->ia_size);
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jfs_truncate(inode);
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}
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setattr_copy(&nop_mnt_idmap, inode, iattr);
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mark_inode_dirty(inode);
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if (iattr->ia_valid & ATTR_MODE)
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rc = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode);
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return rc;
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}
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const struct inode_operations jfs_file_inode_operations = {
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.listxattr = jfs_listxattr,
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.setattr = jfs_setattr,
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.fileattr_get = jfs_fileattr_get,
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.fileattr_set = jfs_fileattr_set,
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#ifdef CONFIG_JFS_POSIX_ACL
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.get_inode_acl = jfs_get_acl,
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.set_acl = jfs_set_acl,
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#endif
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};
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const struct file_operations jfs_file_operations = {
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.open = jfs_open,
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.mmap = generic_file_mmap,
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.splice_read = generic_file_splice_read,
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.splice_write = iter_file_splice_write,
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.fsync = jfs_fsync,
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.release = jfs_release,
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.unlocked_ioctl = jfs_ioctl,
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.compat_ioctl = compat_ptr_ioctl,
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};
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