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tarfs_tar.h File Reference

#include <linux/fs.h>

Go to the source code of this file.

Functions
int	tar_quick_validation (struct super_block *s)
	Performs quick valiadtion of tar.
unsigned long	tar_get_root_ino (struct super_block *s)
	Returns number of root inode.
unsigned long	tar_length (struct super_block *s)
	Returns number of blocks in tar.
int	tar_fill_inode (struct super_block *s, struct inode *inode, int *rdev)
	Reads inode from tar.
unsigned long	tar_readdir (struct file *filp, void *dirent, filldir_t filldir)
	Reads directory entries.
unsigned long	tar_lookup (struct super_block *s, unsigned long ino, const char *fname, unsigned int fsize)
	Searches for file in given directory.
unsigned long	tar_read_page (struct super_block *s, struct inode *inode, loff_t offset, void *buffer)
	Fills buffer with data from given inode.

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Detailed Description

Header file for tarfs_tar.c Contains functions needed for parsing tar This interface is aimed for interoperability with VFS

Author:

Jaroslav Drazan <jaroslavdrazan@seznam.cz>

Petr Cermak <xgxg@seznam.cz>

Definition in file tarfs_tar.h.

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Function Documentation

int tar_fill_inode (  struct super_block *  s, struct inode *  inode, int *  rdev )

Reads inode from tar. Fills inode data like times, acces rights, size of file Parameters: s  Super block structure needed to perform i/o operations inode  Inode structure to be filled rdev  [out] If inode type is device, this parameter is filled with value kdev_t_to_nr(major, minor) Returns: Type of inode, as defined in stat.h (S_IFREG, S_IFLNK, S_IFCHR, S_IFBLK, S_IFIFO, S_IFDIR), 0 in case of error Definition at line 739 of file tarfs_tar.c. References AREGTYPE, BLKTYPE, CHRTYPE, posix_header::devmajor, posix_header::devminor, DIRTYPE, FIFOTYPE, posix_header::gid, is_tar(), posix_header::linkname, LNKTYPE, posix_header::mode, posix_header::mtime, oct_to_dec(), OFFSET_BY_INO, offset_by_name(), pom_read_name(), read_block(), REGTYPE, short_name_size(), posix_header::size, skip_blocks(), SYMTYPE, TARFS_EVAL, TARFS_NUMLENGTH, TARFS_ROOT_INO, posix_header::typeflag, and posix_header::uid. Referenced by tarfs_read_inode().

unsigned long tar_get_root_ino (  struct super_block *  s  )

Returns number of root inode. Parameters: s  Super block structure needed to perform i/o operations Returns: Number of root inode, TARFS_EVAL - error Definition at line 184 of file tarfs_tar.c. References AREGTYPE, BLKTYPE, CHRTYPE, DIRTYPE, FIFOTYPE, get_root_ino_pom(), hcc(), is_tar(), LNKTYPE, oct_to_dec(), read_block(), REGTYPE, posix_header::size, SYMTYPE, TARFS_BLKSIZE, TARFS_EVAL, TARFS_NUMLENGTH, and posix_header::typeflag. Referenced by tarfs_read_super().

unsigned long tar_length (  struct super_block *  s  )

Returns number of blocks in tar. Parameters: s  Super block structure needed to perform i/o operations Returns: Number of blocks, 0 - error (or empty) Definition at line 241 of file tarfs_tar.c. References hcc(), is_nullblock(), is_tar(), oct_to_dec(), read_block(), posix_header::size, tar_quick_validation(), TARFS_BLKSIZE, and TARFS_NUMLENGTH. Referenced by tarfs_statfs().

unsigned long tar_lookup (  struct super_block *  s, unsigned long  ino, const char *  fname, unsigned int  fsize )

Searches for file in given directory. Parameters: s  Super block structure needed to perform i/o operations ino  Inode of directory to be searched in fname  Name of desired file fsize  Size of fname Returns: Inode number of file if found, TARFS_EVAL otherwise Definition at line 1499 of file tarfs_tar.c. References DIRTYPE, hcc(), is_tar(), posix_header::name, oct_to_dec(), OFFSET_BY_INO, offset_by_name2(), pom_read_name(), read_block(), short_name_size(), posix_header::size, TARFS_BLKSIZE, TARFS_EVAL, TARFS_NUMLENGTH, TARFS_ROOT_INO, and posix_header::typeflag. Referenced by tarfs_lookup().

int tar_quick_validation (  struct super_block *  s  )

Performs quick valiadtion of tar. This function controls only the first block Parameters: s  Super block structure needed to perform i/o operations Returns: 1 - OK, 0 - is not tar, or other error Definition at line 137 of file tarfs_tar.c. References is_tar(), and read_block(). Referenced by tar_length(), and tarfs_read_super().

unsigned long tar_read_page (  struct super_block *  s, struct inode *  inode, loff_t  offset, void *  buffer )

Fills buffer with data from given inode. Reads data from inode with given offset to the end of file or end of buffer (max PAGE_SIZE bytes) Parameters: s  Super block structure needed to perform i/o operations inode  Inode with data to be read offset  Offset of desired data buffer  Alredy allocated buffer of size PAGE_SIZE (PAGE_SIZE should be multiple of TARFS_BLKSIZE) Returns: 0 - EOF, 1 - OK, 2 - Symlink, TARFS_EVAL otherwise Definition at line 1099 of file tarfs_tar.c. References find_nolink(), hcc(), read_block(), symlinkname(), TARFS_BLKSIZE, TARFS_EVAL, and TARFS_ROOT_INO. Referenced by tarfs_readpage().

unsigned long tar_readdir (  struct file *  filp, void *  dirent, filldir_t  filldir )

Reads directory entries. Reads directory entries, until stopped by returning <0 from filldir function, after that, it stores last entry id read into filp->f_pos. When called again, it continues from the last f_pos stored. Parameters: filp  A file structure representing directory being read dirent  Falls through this function to the filldir call filldir  Pointer to a function called to add new dir entry Returns: Count of directory entries read, TARFS_EVAL otherwise Definition at line 1218 of file tarfs_tar.c. References AREGTYPE, BLKTYPE, CHRTYPE, DIRTYPE, FIFOTYPE, get_type(), hcc(), is_nullblock(), is_right_prefix(), is_tar(), LNKTYPE, posix_header::name, oct_to_dec(), OFFSET_BY_INO, pom_read_name(), read_block(), REGTYPE, short_name_size(), posix_header::size, skip_blocks(), SYMTYPE, TARFS_BLKSIZE, TARFS_EVAL, TARFS_NUMLENGTH, TARFS_PARENTDIR_FPOS, TARFS_ROOT_INO, TARFS_THISDIR_FPOS, and posix_header::typeflag. Referenced by tarfs_readdir().

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