fs/gfs2/dir.h

Source file repositories/reference/linux-study-clean/fs/gfs2/dir.h

File Facts

System
Linux kernel
Corpus path
fs/gfs2/dir.h
Extension
.h
Size
2450 bytes
Lines
83
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct gfs2_diradd {
	unsigned nr_blocks;
	struct gfs2_dirent *dent;
	struct buffer_head *bh;
	int save_loc;
};

struct inode *gfs2_dir_search(struct inode *dir,
			      const struct qstr *filename,
			      bool fail_on_exist);
int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
		   const struct gfs2_inode *ip);
int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
		 const struct gfs2_inode *ip, struct gfs2_diradd *da);
static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
{
	brelse(da->bh);
	da->bh = NULL;
}
int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
		  struct file_ra_state *f_ra);
int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
		   const struct gfs2_inode *nip, unsigned int new_type);

int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);

int gfs2_diradd_alloc_required(struct inode *dir,
			       const struct qstr *filename,
			       struct gfs2_diradd *da);
int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
			    struct buffer_head **bhp);
void gfs2_dir_hash_inval(struct gfs2_inode *ip);

static inline u32 gfs2_disk_hash(const char *data, int len)
{
        return crc32_le((u32)~0, data, len) ^ (u32)~0;
}


static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
{
	name->name = fname;
	name->len = strlen(fname);
	name->hash = gfs2_disk_hash(name->name, name->len);
}

/* N.B. This probably ought to take inum & type as args as well */
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
{
	dent->de_inum.no_addr = cpu_to_be64(0);
	dent->de_inum.no_formal_ino = cpu_to_be64(0);
	dent->de_hash = cpu_to_be32(name->hash);
	dent->de_rec_len = cpu_to_be16(reclen);
	dent->de_name_len = cpu_to_be16(name->len);
	dent->de_type = cpu_to_be16(0);
	memset(dent->__pad, 0, sizeof(dent->__pad));
	memcpy(dent + 1, name->name, name->len);
}

extern struct qstr gfs2_qdot;
extern struct qstr gfs2_qdotdot;

#endif /* __DIR_DOT_H__ */

Annotation

Implementation Notes