754661f143
Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
176 lines
5.8 KiB
C
176 lines
5.8 KiB
C
#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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/*
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* ext2 mount options
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*/
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struct ext2_mount_options {
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unsigned long s_mount_opt;
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uid_t s_resuid;
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gid_t s_resgid;
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};
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/*
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* second extended file system inode data in memory
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*/
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struct ext2_inode_info {
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__le32 i_data[15];
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__u32 i_flags;
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__u32 i_faddr;
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__u8 i_frag_no;
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__u8 i_frag_size;
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__u16 i_state;
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__u32 i_file_acl;
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__u32 i_dir_acl;
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__u32 i_dtime;
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/*
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* i_block_group is the number of the block group which contains
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* this file's inode. Constant across the lifetime of the inode,
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* it is ued for making block allocation decisions - we try to
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* place a file's data blocks near its inode block, and new inodes
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* near to their parent directory's inode.
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*/
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__u32 i_block_group;
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/*
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* i_next_alloc_block is the logical (file-relative) number of the
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* most-recently-allocated block in this file. Yes, it is misnamed.
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* We use this for detecting linearly ascending allocation requests.
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*/
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__u32 i_next_alloc_block;
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/*
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* i_next_alloc_goal is the *physical* companion to i_next_alloc_block.
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* it the the physical block number of the block which was most-recently
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* allocated to this file. This give us the goal (target) for the next
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* allocation when we detect linearly ascending requests.
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*/
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__u32 i_next_alloc_goal;
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__u32 i_prealloc_block;
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__u32 i_prealloc_count;
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__u32 i_dir_start_lookup;
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#ifdef CONFIG_EXT2_FS_XATTR
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/*
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* Extended attributes can be read independently of the main file
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* data. Taking i_mutex even when reading would cause contention
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* between readers of EAs and writers of regular file data, so
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* instead we synchronize on xattr_sem when reading or changing
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* EAs.
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*/
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struct rw_semaphore xattr_sem;
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#endif
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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#endif
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rwlock_t i_meta_lock;
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struct inode vfs_inode;
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};
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/*
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* Inode dynamic state flags
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*/
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#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
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/*
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* Function prototypes
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*/
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/*
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* Ok, these declarations are also in <linux/kernel.h> but none of the
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* ext2 source programs needs to include it so they are duplicated here.
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*/
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static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
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{
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return container_of(inode, struct ext2_inode_info, vfs_inode);
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}
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/* balloc.c */
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extern int ext2_bg_has_super(struct super_block *sb, int group);
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extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
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extern int ext2_new_block (struct inode *, unsigned long,
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__u32 *, __u32 *, int *);
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extern void ext2_free_blocks (struct inode *, unsigned long,
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unsigned long);
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extern unsigned long ext2_count_free_blocks (struct super_block *);
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extern unsigned long ext2_count_dirs (struct super_block *);
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extern void ext2_check_blocks_bitmap (struct super_block *);
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extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
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unsigned int block_group,
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struct buffer_head ** bh);
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/* dir.c */
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extern int ext2_add_link (struct dentry *, struct inode *);
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extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
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extern int ext2_make_empty(struct inode *, struct inode *);
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extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
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extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
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extern int ext2_empty_dir (struct inode *);
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extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
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extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
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/* fsync.c */
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extern int ext2_sync_file (struct file *, struct dentry *, int);
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/* ialloc.c */
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extern struct inode * ext2_new_inode (struct inode *, int);
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extern void ext2_free_inode (struct inode *);
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extern unsigned long ext2_count_free_inodes (struct super_block *);
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extern void ext2_check_inodes_bitmap (struct super_block *);
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extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
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/* inode.c */
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extern void ext2_read_inode (struct inode *);
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extern int ext2_write_inode (struct inode *, int);
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extern void ext2_put_inode (struct inode *);
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extern void ext2_delete_inode (struct inode *);
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extern int ext2_sync_inode (struct inode *);
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extern void ext2_discard_prealloc (struct inode *);
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extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern void ext2_truncate (struct inode *);
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extern int ext2_setattr (struct dentry *, struct iattr *);
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extern void ext2_set_inode_flags(struct inode *inode);
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/* ioctl.c */
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extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
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unsigned long);
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extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
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/* namei.c */
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struct dentry *ext2_get_parent(struct dentry *child);
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/* super.c */
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extern void ext2_error (struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern void ext2_warning (struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern void ext2_update_dynamic_rev (struct super_block *sb);
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extern void ext2_write_super (struct super_block *);
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/*
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* Inodes and files operations
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*/
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/* dir.c */
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extern const struct file_operations ext2_dir_operations;
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/* file.c */
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extern const struct inode_operations ext2_file_inode_operations;
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extern const struct file_operations ext2_file_operations;
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extern const struct file_operations ext2_xip_file_operations;
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/* inode.c */
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extern const struct address_space_operations ext2_aops;
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extern const struct address_space_operations ext2_aops_xip;
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extern const struct address_space_operations ext2_nobh_aops;
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/* namei.c */
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extern const struct inode_operations ext2_dir_inode_operations;
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extern const struct inode_operations ext2_special_inode_operations;
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/* symlink.c */
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extern const struct inode_operations ext2_fast_symlink_inode_operations;
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extern const struct inode_operations ext2_symlink_inode_operations;
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