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f2d40141d5
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("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>
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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*/
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#include <linux/fs.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_filsys.h"
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#include "jfs_imap.h"
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#include "jfs_dinode.h"
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#include "jfs_debug.h"
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void jfs_set_inode_flags(struct inode *inode)
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{
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unsigned int flags = JFS_IP(inode)->mode2;
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unsigned int new_fl = 0;
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if (flags & JFS_IMMUTABLE_FL)
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new_fl |= S_IMMUTABLE;
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if (flags & JFS_APPEND_FL)
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new_fl |= S_APPEND;
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if (flags & JFS_NOATIME_FL)
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new_fl |= S_NOATIME;
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if (flags & JFS_DIRSYNC_FL)
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new_fl |= S_DIRSYNC;
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if (flags & JFS_SYNC_FL)
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new_fl |= S_SYNC;
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inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND | S_NOATIME |
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S_DIRSYNC | S_SYNC);
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}
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/*
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* NAME: ialloc()
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*
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* FUNCTION: Allocate a new inode
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*
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*/
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struct inode *ialloc(struct inode *parent, umode_t mode)
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{
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struct super_block *sb = parent->i_sb;
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struct inode *inode;
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struct jfs_inode_info *jfs_inode;
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int rc;
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inode = new_inode(sb);
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if (!inode) {
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jfs_warn("ialloc: new_inode returned NULL!");
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return ERR_PTR(-ENOMEM);
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}
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jfs_inode = JFS_IP(inode);
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rc = diAlloc(parent, S_ISDIR(mode), inode);
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if (rc) {
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jfs_warn("ialloc: diAlloc returned %d!", rc);
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goto fail_put;
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}
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if (insert_inode_locked(inode) < 0) {
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rc = -EINVAL;
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goto fail_put;
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}
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inode_init_owner(&nop_mnt_idmap, inode, parent, mode);
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/*
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* New inodes need to save sane values on disk when
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* uid & gid mount options are used
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*/
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jfs_inode->saved_uid = inode->i_uid;
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jfs_inode->saved_gid = inode->i_gid;
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/*
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* Allocate inode to quota.
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*/
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rc = dquot_initialize(inode);
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if (rc)
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goto fail_drop;
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rc = dquot_alloc_inode(inode);
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if (rc)
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goto fail_drop;
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/* inherit flags from parent */
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jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;
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if (S_ISDIR(mode)) {
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jfs_inode->mode2 |= IDIRECTORY;
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jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;
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}
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else {
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jfs_inode->mode2 |= INLINEEA | ISPARSE;
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if (S_ISLNK(mode))
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jfs_inode->mode2 &= ~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);
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}
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jfs_inode->mode2 |= inode->i_mode;
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inode->i_blocks = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
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jfs_inode->otime = inode->i_ctime.tv_sec;
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inode->i_generation = JFS_SBI(sb)->gengen++;
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jfs_inode->cflag = 0;
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/* Zero remaining fields */
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memset(&jfs_inode->acl, 0, sizeof(dxd_t));
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memset(&jfs_inode->ea, 0, sizeof(dxd_t));
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jfs_inode->next_index = 0;
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jfs_inode->acltype = 0;
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jfs_inode->btorder = 0;
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jfs_inode->btindex = 0;
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jfs_inode->bxflag = 0;
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jfs_inode->blid = 0;
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jfs_inode->atlhead = 0;
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jfs_inode->atltail = 0;
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jfs_inode->xtlid = 0;
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jfs_set_inode_flags(inode);
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jfs_info("ialloc returns inode = 0x%p", inode);
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return inode;
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fail_drop:
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dquot_drop(inode);
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inode->i_flags |= S_NOQUOTA;
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clear_nlink(inode);
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discard_new_inode(inode);
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return ERR_PTR(rc);
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fail_put:
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iput(inode);
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return ERR_PTR(rc);
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}
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