Commit 6b2647a1 authored by Dave Chinner's avatar Dave Chinner Committed by Ben Myers
Browse files

xfs: shortform directory offsets change for dir3 format 



Because the header size for the CRC enabled directory blocks is
larger, the offset of the first entry into a directory block is
different to the dir2 format. The shortform directory stores the
dirent's offset so that it doesn't change when moving from shortform
to block form and back again, and hence it needs to take into
account the different header sizes to maintain the correct offsets.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarBen Myers <bpm@sgi.com>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
parent 24df33b4

fs/xfs/xfs_dir2_format.h

+14 −11
Original line number Diff line number Diff line
@@ -227,16 +227,6 @@ xfs_dir2_sf_nextentry(struct xfs_dir2_sf_hdr *hdr, 
#define	XFS_DIR2_DATA_FIRSTDB(mp)	\

	xfs_dir2_byte_to_db(mp, XFS_DIR2_DATA_OFFSET)



/*

 * Offsets of . and .. in data space (always block 0)

 */

#define	XFS_DIR2_DATA_DOT_OFFSET	\

	((xfs_dir2_data_aoff_t)sizeof(struct xfs_dir2_data_hdr))

#define	XFS_DIR2_DATA_DOTDOT_OFFSET	\

	(XFS_DIR2_DATA_DOT_OFFSET + xfs_dir2_data_entsize(1))

#define	XFS_DIR2_DATA_FIRST_OFFSET		\

	(XFS_DIR2_DATA_DOTDOT_OFFSET + xfs_dir2_data_entsize(2))



/*

 * Describe a free area in the data block.

 *
@@ -378,7 +368,20 @@ xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) 


/*

 * Offsets of . and .. in data space (always block 0)

 */

 *

 * The macros are used for shortform directories as they have no headers to read

 * the magic number out of. Shortform directories need to know the size of the

 * data block header because the sfe embeds the block offset of the entry into

 * it so that it doesn't change when format conversion occurs. Bad Things Happen

 * if we don't follow this rule.

 */

#define	XFS_DIR3_DATA_DOT_OFFSET(mp)	\

	xfs_dir3_data_hdr_size(xfs_sb_version_hascrc(&(mp)->m_sb))

#define	XFS_DIR3_DATA_DOTDOT_OFFSET(mp)	\

	(XFS_DIR3_DATA_DOT_OFFSET(mp) + xfs_dir2_data_entsize(1))

#define	XFS_DIR3_DATA_FIRST_OFFSET(mp)		\

	(XFS_DIR3_DATA_DOTDOT_OFFSET(mp) + xfs_dir2_data_entsize(2))



static inline xfs_dir2_data_aoff_t

xfs_dir3_data_dot_offset(struct xfs_dir2_data_hdr *hdr)

{

fs/xfs/xfs_dir2_sf.c

+5 −5
Original line number Diff line number Diff line
@@ -535,7 +535,7 @@ xfs_dir2_sf_addname_hard( 
	 * to insert the new entry.

	 * If it's going to end up at the end then oldsfep will point there.

	 */

	for (offset = XFS_DIR2_DATA_FIRST_OFFSET,

	for (offset = XFS_DIR3_DATA_FIRST_OFFSET(dp->i_mount),

	      oldsfep = xfs_dir2_sf_firstentry(oldsfp),

	      add_datasize = xfs_dir2_data_entsize(args->namelen),

	      eof = (char *)oldsfep == &buf[old_isize];
@@ -617,7 +617,7 @@ xfs_dir2_sf_addname_pick( 


	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;

	size = xfs_dir2_data_entsize(args->namelen);

	offset = XFS_DIR2_DATA_FIRST_OFFSET;

	offset = XFS_DIR3_DATA_FIRST_OFFSET(mp);

	sfep = xfs_dir2_sf_firstentry(sfp);

	holefit = 0;

	/*
@@ -688,7 +688,7 @@ xfs_dir2_sf_check( 
	dp = args->dp;



	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;

	offset = XFS_DIR2_DATA_FIRST_OFFSET;

	offset = XFS_DIR3_DATA_FIRST_OFFSET(dp->i_mount);

	ino = xfs_dir2_sf_get_parent_ino(sfp);

	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
@@ -812,9 +812,9 @@ xfs_dir2_sf_getdents( 
	 * mp->m_dirdatablk.

	 */

	dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,

					     XFS_DIR2_DATA_DOT_OFFSET);

					     XFS_DIR3_DATA_DOT_OFFSET(mp));

	dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,

						XFS_DIR2_DATA_DOTDOT_OFFSET);

						XFS_DIR3_DATA_DOTDOT_OFFSET(mp));



	/*

	 * Put . entry unless we're starting past it.

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