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549c729771
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*/
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#ifndef __INODE_DOT_H__
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#define __INODE_DOT_H__
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/mm.h>
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#include "util.h"
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extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
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extern int gfs2_internal_read(struct gfs2_inode *ip,
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char *buf, loff_t *pos, unsigned size);
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extern void gfs2_set_aops(struct inode *inode);
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static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
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{
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return !ip->i_height;
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}
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static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
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{
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return ip->i_diskflags & GFS2_DIF_JDATA;
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}
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static inline bool gfs2_is_ordered(const struct gfs2_sbd *sdp)
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{
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return sdp->sd_args.ar_data == GFS2_DATA_ORDERED;
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}
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static inline bool gfs2_is_writeback(const struct gfs2_sbd *sdp)
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{
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return sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK;
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}
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static inline int gfs2_is_dir(const struct gfs2_inode *ip)
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{
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return S_ISDIR(ip->i_inode.i_mode);
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}
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static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
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{
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inode->i_blocks = blocks <<
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
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{
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return inode->i_blocks >>
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
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{
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change <<= inode->i_blkbits - GFS2_BASIC_BLOCK_SHIFT;
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gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks >= -change));
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inode->i_blocks += change;
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}
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static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
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u64 no_formal_ino)
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{
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return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
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}
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static inline void gfs2_inum_out(const struct gfs2_inode *ip,
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struct gfs2_dirent *dent)
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{
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dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
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dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
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}
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static inline int gfs2_check_internal_file_size(struct inode *inode,
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u64 minsize, u64 maxsize)
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{
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u64 size = i_size_read(inode);
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if (size < minsize || size > maxsize)
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goto err;
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if (size & (BIT(inode->i_blkbits) - 1))
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goto err;
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return 0;
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err:
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gfs2_consist_inode(GFS2_I(inode));
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return -EIO;
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}
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extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
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u64 no_addr, u64 no_formal_ino,
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unsigned int blktype);
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extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
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u64 no_formal_ino,
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unsigned int blktype);
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extern int gfs2_inode_refresh(struct gfs2_inode *ip);
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extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
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int is_root);
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extern int gfs2_permission(struct user_namespace *mnt_userns,
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struct inode *inode, int mask);
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extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
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extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
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extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
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extern int gfs2_open_common(struct inode *inode, struct file *file);
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extern loff_t gfs2_seek_data(struct file *file, loff_t offset);
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extern loff_t gfs2_seek_hole(struct file *file, loff_t offset);
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extern const struct file_operations gfs2_file_fops_nolock;
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extern const struct file_operations gfs2_dir_fops_nolock;
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extern void gfs2_set_inode_flags(struct inode *inode);
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#ifdef CONFIG_GFS2_FS_LOCKING_DLM
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extern const struct file_operations gfs2_file_fops;
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extern const struct file_operations gfs2_dir_fops;
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return sdp->sd_args.ar_localflocks;
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}
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#else /* Single node only */
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#define gfs2_file_fops gfs2_file_fops_nolock
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#define gfs2_dir_fops gfs2_dir_fops_nolock
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return 1;
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}
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#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
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#endif /* __INODE_DOT_H__ */
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