[PATCH 13/27] xfs: cleanup shortform directory inode number handling

Christoph Hellwig
2011-07-01T09:46:07Z

[-- Attachment #1: xfs-dir2_sf-cleanup-inum-handling --]
[-- Type: text/plain, Size: 13549 bytes --]

Refactor the shortform directory helpers that deal with the 32-bit vs
64-bit wide inode numbers into more sensible helpers, and kill the
xfs_intino_t typedef that is now superflous.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

Index: xfs/fs/xfs/xfs_dir2_sf.c
===================================================================
--- xfs.orig/fs/xfs/xfs_dir2_sf.c 2011-06-30 09:31:15.330073010 +0200
+++ xfs/fs/xfs/xfs_dir2_sf.c 2011-06-30 09:34:46.640070544 +0200
@@ -59,6 +59,79 @@ static void xfs_dir2_sf_toino4(xfs_da_ar
static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
#endif /* XFS_BIG_INUMS */

+
+/*
+ * Inode numbers in short-form directories can come in two versions,
+ * either 4 bytes or 8 bytes wide. These helpers deal with the
+ * two forms transparently by looking at the headers i8count field.
+ */
+static xfs_ino_t
+xfs_dir2_sf_get_ino(
+ struct xfs_dir2_sf *sfp,
+ xfs_dir2_inou_t *from)
+{
+ if (sfp->hdr.i8count)
+ return XFS_GET_DIR_INO8(from->i8);
+ else
+ return XFS_GET_DIR_INO4(from->i4);
+}
+
+static void
+xfs_dir2_sf_put_ino(
+ struct xfs_dir2_sf *sfp,
+ xfs_dir2_inou_t *to,
+ xfs_ino_t ino)
+{
+ if (sfp->hdr.i8count)
+ XFS_PUT_DIR_INO8(ino, to->i8);
+ else
+ XFS_PUT_DIR_INO4(ino, to->i4);
+}
+
+xfs_ino_t
+xfs_dir2_sf_get_parent_ino(
+ struct xfs_dir2_sf *sfp)
+{
+ return xfs_dir2_sf_get_ino(sfp, &sfp->hdr.parent);
+}
+
+static void
+xfs_dir2_sf_put_parent_ino(
+ struct xfs_dir2_sf *sfp,
+ xfs_ino_t ino)
+{
+ xfs_dir2_sf_put_ino(sfp, &sfp->hdr.parent, ino);
+}
+
+/*
+ * In short-form directory entries the inode numbers are stored at variable
+ * offset behind the entry name. The inode numbers may only be accessed
+ * through the helpers below.
+ */
+static xfs_dir2_inou_t *
+xfs_dir2_sfe_inop(
+ struct xfs_dir2_sf_entry *sfep)
+{
+ return (xfs_dir2_inou_t *)&sfep->name[sfep->namelen];
+}
+
+xfs_ino_t
+xfs_dir2_sfe_get_ino(
+ struct xfs_dir2_sf *sfp,
+ struct xfs_dir2_sf_entry *sfep)
+{
+ return xfs_dir2_sf_get_ino(sfp, xfs_dir2_sfe_inop(sfep));
+}
+
+static void
+xfs_dir2_sfe_put_ino(
+ struct xfs_dir2_sf *sfp,
+ struct xfs_dir2_sf_entry *sfep,
+ xfs_ino_t ino)
+{
+ xfs_dir2_sf_put_ino(sfp, xfs_dir2_sfe_inop(sfep), ino);
+}
+
/*
* Given a block directory (dp/block), calculate its size as a shortform (sf)
* directory and a header for the sf directory, if it will fit it the
@@ -138,7 +211,7 @@ xfs_dir2_block_sfsize(
*/
sfhp->count = count;
sfhp->i8count = i8count;
- xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
+ xfs_dir2_sf_put_parent_ino((xfs_dir2_sf_t *)sfhp, parent);
return size;
}

@@ -165,7 +238,6 @@ xfs_dir2_block_to_sf(
char *ptr; /* current data pointer */
xfs_dir2_sf_entry_t *sfep; /* shortform entry */
xfs_dir2_sf_t *sfp; /* shortform structure */
- xfs_ino_t temp;

trace_xfs_dir2_block_to_sf(args);

@@ -233,7 +305,7 @@ xfs_dir2_block_to_sf(
else if (dep->namelen == 2 &&
dep->name[0] == '.' && dep->name[1] == '.')
ASSERT(be64_to_cpu(dep->inumber) ==
- xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
+ xfs_dir2_sf_get_parent_ino(sfp));
/*
* Normal entry, copy it into shortform.
*/
@@ -243,9 +315,9 @@ xfs_dir2_block_to_sf(
(xfs_dir2_data_aoff_t)
((char *)dep - (char *)block));
memcpy(sfep->name, dep->name, dep->namelen);
- temp = be64_to_cpu(dep->inumber);
- xfs_dir2_sf_put_inumber(sfp, &temp,
- xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep,
+ be64_to_cpu(dep->inumber));
+
sfep = xfs_dir2_sf_nextentry(sfp, sfep);
}
ptr += xfs_dir2_data_entsize(dep->namelen);
@@ -406,8 +478,7 @@ xfs_dir2_sf_addname_easy(
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
- xfs_dir2_sf_put_inumber(sfp, &args->inumber,
- xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
/*
* Update the header and inode.
*/
@@ -498,8 +569,7 @@ xfs_dir2_sf_addname_hard(
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
- xfs_dir2_sf_put_inumber(sfp, &args->inumber,
- xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
sfp->hdr.count++;
#if XFS_BIG_INUMS
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
@@ -618,14 +688,14 @@ xfs_dir2_sf_check(

sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
offset = XFS_DIR2_DATA_FIRST_OFFSET;
- ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
+ ino = xfs_dir2_sf_get_parent_ino(sfp);
i8count = ino > XFS_DIR2_MAX_SHORT_INUM;

for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
i < sfp->hdr.count;
i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
- ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
+ ino = xfs_dir2_sfe_get_ino(sfp, sfep);
i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
offset =
xfs_dir2_sf_get_offset(sfep) +
@@ -686,7 +756,7 @@ xfs_dir2_sf_create(
/*
* Now can put in the inode number, since i8count is set.
*/
- xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);
+ xfs_dir2_sf_put_parent_ino(sfp, pino);
sfp->hdr.count = 0;
dp->i_d.di_size = size;
xfs_dir2_sf_check(args);
@@ -759,7 +829,7 @@ xfs_dir2_sf_getdents(
* Put .. entry unless we're starting past it.
*/
if (*offset <= dotdot_offset) {
- ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
+ ino = xfs_dir2_sf_get_parent_ino(sfp);
if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
*offset = dotdot_offset & 0x7fffffff;
return 0;
@@ -779,7 +849,7 @@ xfs_dir2_sf_getdents(
continue;
}

- ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
+ ino = xfs_dir2_sfe_get_ino(sfp, sfep);
if (filldir(dirent, (char *)sfep->name, sfep->namelen,
off & 0x7fffffff, ino, DT_UNKNOWN)) {
*offset = off & 0x7fffffff;
@@ -839,7 +909,7 @@ xfs_dir2_sf_lookup(
*/
if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
- args->inumber = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
+ args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
args->cmpresult = XFS_CMP_EXACT;
return XFS_ERROR(EEXIST);
}
@@ -858,8 +928,7 @@ xfs_dir2_sf_lookup(
sfep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
args->cmpresult = cmp;
- args->inumber = xfs_dir2_sf_get_inumber(sfp,
- xfs_dir2_sf_inumberp(sfep));
+ args->inumber = xfs_dir2_sfe_get_ino(sfp, sfep);
if (cmp == XFS_CMP_EXACT)
return XFS_ERROR(EEXIST);
ci_sfep = sfep;
@@ -918,9 +987,8 @@ xfs_dir2_sf_removename(
i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
- ASSERT(xfs_dir2_sf_get_inumber(sfp,
- xfs_dir2_sf_inumberp(sfep)) ==
- args->inumber);
+ ASSERT(xfs_dir2_sfe_get_ino(sfp, sfep) ==
+ args->inumber);
break;
}
}
@@ -1040,10 +1108,10 @@ xfs_dir2_sf_replace(
if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
#if XFS_BIG_INUMS || defined(DEBUG)
- ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
+ ino = xfs_dir2_sf_get_parent_ino(sfp);
ASSERT(args->inumber != ino);
#endif
- xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);
+ xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
}
/*
* Normal entry, look for the name.
@@ -1055,12 +1123,10 @@ xfs_dir2_sf_replace(
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
#if XFS_BIG_INUMS || defined(DEBUG)
- ino = xfs_dir2_sf_get_inumber(sfp,
- xfs_dir2_sf_inumberp(sfep));
+ ino = xfs_dir2_sfe_get_ino(sfp, sfep);
ASSERT(args->inumber != ino);
#endif
- xfs_dir2_sf_put_inumber(sfp, &args->inumber,
- xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
break;
}
}
@@ -1121,7 +1187,6 @@ xfs_dir2_sf_toino4(
char *buf; /* old dir's buffer */
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
- xfs_ino_t ino; /* entry inode number */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
xfs_dir2_sf_t *oldsfp; /* old sf directory */
@@ -1162,8 +1227,7 @@ xfs_dir2_sf_toino4(
*/
sfp->hdr.count = oldsfp->hdr.count;
sfp->hdr.i8count = 0;
- ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
- xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
+ xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
/*
* Copy the entries field by field.
*/
@@ -1175,9 +1239,8 @@ xfs_dir2_sf_toino4(
sfep->namelen = oldsfep->namelen;
sfep->offset = oldsfep->offset;
memcpy(sfep->name, oldsfep->name, sfep->namelen);
- ino = xfs_dir2_sf_get_inumber(oldsfp,
- xfs_dir2_sf_inumberp(oldsfep));
- xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep,
+ xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
}
/*
* Clean up the inode.
@@ -1199,7 +1262,6 @@ xfs_dir2_sf_toino8(
char *buf; /* old dir's buffer */
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
- xfs_ino_t ino; /* entry inode number */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
xfs_dir2_sf_t *oldsfp; /* old sf directory */
@@ -1240,8 +1302,7 @@ xfs_dir2_sf_toino8(
*/
sfp->hdr.count = oldsfp->hdr.count;
sfp->hdr.i8count = 1;
- ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
- xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
+ xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
/*
* Copy the entries field by field.
*/
@@ -1253,9 +1314,8 @@ xfs_dir2_sf_toino8(
sfep->namelen = oldsfep->namelen;
sfep->offset = oldsfep->offset;
memcpy(sfep->name, oldsfep->name, sfep->namelen);
- ino = xfs_dir2_sf_get_inumber(oldsfp,
- xfs_dir2_sf_inumberp(oldsfep));
- xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
+ xfs_dir2_sfe_put_ino(sfp, sfep,
+ xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
}
/*
* Clean up the inode.
Index: xfs/fs/xfs/xfs_dir2_sf.h
===================================================================
--- xfs.orig/fs/xfs/xfs_dir2_sf.h 2011-06-30 09:31:15.343406344 +0200
+++ xfs/fs/xfs/xfs_dir2_sf.h 2011-06-30 09:32:00.390072451 +0200
@@ -90,28 +90,6 @@ static inline int xfs_dir2_sf_hdr_size(i
((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)));
}

-static inline xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep)
-{
- return (xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen];
-}
-
-static inline xfs_intino_t
-xfs_dir2_sf_get_inumber(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from)
-{
- return ((sfp)->hdr.i8count == 0 ? \
- (xfs_intino_t)XFS_GET_DIR_INO4((from)->i4) : \
- (xfs_intino_t)XFS_GET_DIR_INO8((from)->i8));
-}
-
-static inline void xfs_dir2_sf_put_inumber(xfs_dir2_sf_t *sfp, xfs_ino_t *from,
- xfs_dir2_inou_t *to)
-{
- if ((sfp)->hdr.i8count == 0)
- XFS_PUT_DIR_INO4(*(from), (to)->i4);
- else
- XFS_PUT_DIR_INO8(*(from), (to)->i8);
-}
-
static inline xfs_dir2_data_aoff_t
xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep)
{
@@ -155,6 +133,9 @@ xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp
/*
* Functions.
*/
+extern xfs_ino_t xfs_dir2_sf_get_parent_ino(struct xfs_dir2_sf *sfp);
+extern xfs_ino_t xfs_dir2_sfe_get_ino(struct xfs_dir2_sf *sfp,
+ struct xfs_dir2_sf_entry *sfep);
extern int xfs_dir2_block_sfsize(struct xfs_inode *dp,
struct xfs_dir2_block *block,
xfs_dir2_sf_hdr_t *sfhp);
Index: xfs/fs/xfs/xfs_inum.h
===================================================================
--- xfs.orig/fs/xfs/xfs_inum.h 2011-06-30 09:31:15.353406344 +0200
+++ xfs/fs/xfs/xfs_inum.h 2011-06-30 09:32:00.390072451 +0200
@@ -28,17 +28,6 @@

typedef __uint32_t xfs_agino_t; /* within allocation grp inode number */

-/*
- * Useful inode bits for this kernel.
- * Used in some places where having 64-bits in the 32-bit kernels
- * costs too much.
- */
-#if XFS_BIG_INUMS
-typedef xfs_ino_t xfs_intino_t;
-#else
-typedef __uint32_t xfs_intino_t;
-#endif
-
#define NULLFSINO ((xfs_ino_t)-1)
#define NULLAGINO ((xfs_agino_t)-1)

Index: xfs/fs/xfs/xfs_dir2_block.c
===================================================================
--- xfs.orig/fs/xfs/xfs_dir2_block.c 2011-06-30 09:31:15.000000000 +0200
+++ xfs/fs/xfs/xfs_dir2_block.c 2011-06-30 09:32:00.393405784 +0200
@@ -1146,7 +1146,7 @@ xfs_dir2_sf_to_block(
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
- dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
+ dep->inumber = cpu_to_be64(xfs_dir2_sf_get_parent_ino(sfp));
dep->namelen = 2;
dep->name[0] = dep->name[1] = '.';
tagp = xfs_dir2_data_entry_tag_p(dep);
@@ -1195,8 +1195,7 @@ xfs_dir2_sf_to_block(
* Copy a real entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
- dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp,
- xfs_dir2_sf_inumberp(sfep)));
+ dep->inumber = cpu_to_be64(xfs_dir2_sfe_get_ino(sfp, sfep));
dep->namelen = sfep->namelen;
memcpy(dep->name, sfep->name, dep->namelen);
tagp = xfs_dir2_data_entry_tag_p(dep);