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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>
171 lines
5.2 KiB
C
171 lines
5.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef FS_MINIX_H
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#define FS_MINIX_H
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/minix_fs.h>
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#define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version
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#define MINIX_V1 0x0001 /* original minix fs */
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#define MINIX_V2 0x0002 /* minix V2 fs */
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#define MINIX_V3 0x0003 /* minix V3 fs */
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/*
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* minix fs inode data in memory
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*/
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struct minix_inode_info {
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union {
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__u16 i1_data[16];
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__u32 i2_data[16];
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} u;
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struct inode vfs_inode;
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};
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/*
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* minix super-block data in memory
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*/
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struct minix_sb_info {
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unsigned long s_ninodes;
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unsigned long s_nzones;
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unsigned long s_imap_blocks;
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unsigned long s_zmap_blocks;
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unsigned long s_firstdatazone;
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unsigned long s_log_zone_size;
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int s_dirsize;
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int s_namelen;
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struct buffer_head ** s_imap;
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struct buffer_head ** s_zmap;
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struct buffer_head * s_sbh;
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struct minix_super_block * s_ms;
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unsigned short s_mount_state;
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unsigned short s_version;
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};
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extern struct inode *minix_iget(struct super_block *, unsigned long);
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extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
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extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
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extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
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extern void minix_free_inode(struct inode * inode);
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extern unsigned long minix_count_free_inodes(struct super_block *sb);
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extern int minix_new_block(struct inode * inode);
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extern void minix_free_block(struct inode *inode, unsigned long block);
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extern unsigned long minix_count_free_blocks(struct super_block *sb);
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extern int minix_getattr(struct user_namespace *, const struct path *,
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struct kstat *, u32, unsigned int);
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extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
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extern void V1_minix_truncate(struct inode *);
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extern void V2_minix_truncate(struct inode *);
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extern void minix_truncate(struct inode *);
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extern void minix_set_inode(struct inode *, dev_t);
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extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
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extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
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extern unsigned V1_minix_blocks(loff_t, struct super_block *);
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extern unsigned V2_minix_blocks(loff_t, struct super_block *);
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extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
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extern int minix_add_link(struct dentry*, struct inode*);
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extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
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extern int minix_make_empty(struct inode*, struct inode*);
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extern int minix_empty_dir(struct inode*);
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extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
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extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
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extern ino_t minix_inode_by_name(struct dentry*);
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extern const struct inode_operations minix_file_inode_operations;
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extern const struct inode_operations minix_dir_inode_operations;
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extern const struct file_operations minix_file_operations;
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extern const struct file_operations minix_dir_operations;
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static inline struct minix_sb_info *minix_sb(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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static inline struct minix_inode_info *minix_i(struct inode *inode)
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{
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return container_of(inode, struct minix_inode_info, vfs_inode);
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}
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static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
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{
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return DIV_ROUND_UP(bits, blocksize * 8);
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}
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#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
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defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
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#error Minix file system byte order broken
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#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
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/*
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* big-endian 32 or 64 bit indexed bitmaps on big-endian system or
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* little-endian bitmaps on little-endian system
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*/
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#define minix_test_and_set_bit(nr, addr) \
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__test_and_set_bit((nr), (unsigned long *)(addr))
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#define minix_set_bit(nr, addr) \
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__set_bit((nr), (unsigned long *)(addr))
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#define minix_test_and_clear_bit(nr, addr) \
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__test_and_clear_bit((nr), (unsigned long *)(addr))
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#define minix_test_bit(nr, addr) \
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test_bit((nr), (unsigned long *)(addr))
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#define minix_find_first_zero_bit(addr, size) \
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find_first_zero_bit((unsigned long *)(addr), (size))
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#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
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/*
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* big-endian 16bit indexed bitmaps
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*/
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static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
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{
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const unsigned short *p = vaddr, *addr = vaddr;
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unsigned short num;
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if (!size)
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return 0;
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size >>= 4;
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while (*p++ == 0xffff) {
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if (--size == 0)
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return (p - addr) << 4;
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}
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num = *--p;
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return ((p - addr) << 4) + ffz(num);
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}
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#define minix_test_and_set_bit(nr, addr) \
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__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
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#define minix_set_bit(nr, addr) \
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__set_bit((nr) ^ 16, (unsigned long *)(addr))
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#define minix_test_and_clear_bit(nr, addr) \
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__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
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static inline int minix_test_bit(int nr, const void *vaddr)
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{
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const unsigned short *p = vaddr;
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return (p[nr >> 4] & (1U << (nr & 15))) != 0;
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}
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#else
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/*
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* little-endian bitmaps
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*/
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#define minix_test_and_set_bit __test_and_set_bit_le
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#define minix_set_bit __set_bit_le
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#define minix_test_and_clear_bit __test_and_clear_bit_le
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#define minix_test_bit test_bit_le
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#define minix_find_first_zero_bit find_first_zero_bit_le
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#endif
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#endif /* FS_MINIX_H */
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