/*========================================================================
- * External routines when dirsize < XFS_LITINO(mp).
+ * External routines when attribute fork size < XFS_LITINO(mp).
*========================================================================*/
/*
- * Create the initial contents of a shortform attribute list.
+ * Query whether the requested number of additional bytes of extended
+ * attribute space will be able to fit inline.
+ * Returns zero if not, else the di_forkoff fork offset to be used in the
+ * literal area for attribute data once the new bytes have been added.
+ *
+ * di_forkoff must be 8 byte aligned, hence is stored as a >>3 value;
+ * special case for dev/uuid inodes, they have fixed size data forks.
*/
int
+xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
+{
+ int offset;
+ int minforkoff; /* lower limit on valid forkoff locations */
+ int maxforkoff; /* upper limit on valid forkoff locations */
+ xfs_mount_t *mp = dp->i_mount;
+
+ if (unlikely(mp->m_flags & XFS_MOUNT_COMPAT_ATTR)) {
+ if (bytes <= XFS_IFORK_ASIZE(dp))
+ return mp->m_attroffset >> 3;
+ return 0;
+ }
+
+ offset = (XFS_LITINO(mp) - bytes) >> 3; /* rounded down */
+
+ switch (dp->i_d.di_format) {
+ case XFS_DINODE_FMT_DEV:
+ minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
+ return (offset >= minforkoff) ? minforkoff : 0;
+ case XFS_DINODE_FMT_UUID:
+ minforkoff = roundup(sizeof(uuid_t), 8) >> 3;
+ return (offset >= minforkoff) ? minforkoff : 0;
+ }
+
+ /* data fork btree root can have at least this many key/ptr pairs */
+ minforkoff = MAX(dp->i_df.if_bytes, XFS_BMDR_SPACE_CALC(MINDBTPTRS));
+ minforkoff = roundup(minforkoff, 8) >> 3;
+
+ /* attr fork btree root can have at least this many key/ptr pairs */
+ maxforkoff = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ maxforkoff = maxforkoff >> 3; /* rounded down */
+
+ if (offset >= minforkoff && offset < maxforkoff)
+ return offset;
+ if (offset >= maxforkoff)
+ return maxforkoff;
+ return 0;
+}
+
+/*
+ * Switch on the ATTR2 superblock bit (implies also FEATURES2)
+ */
+STATIC void
+xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
+{
+ unsigned long s;
+
+ if (!(mp->m_flags & XFS_MOUNT_COMPAT_ATTR) &&
+ !(XFS_SB_VERSION_HASATTR2(&mp->m_sb))) {
+ s = XFS_SB_LOCK(mp);
+ if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb)) {
+ XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
+ XFS_SB_UNLOCK(mp, s);
+ xfs_mod_sb(tp, XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
+ } else
+ XFS_SB_UNLOCK(mp, s);
+ }
+}
+
+/*
+ * Create the initial contents of a shortform attribute list.
+ */
+void
xfs_attr_shortform_create(xfs_da_args_t *args)
{
xfs_attr_sf_hdr_t *hdr;
hdr->count = 0;
INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr));
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
- return(0);
}
/*
* Add a name/value pair to the shortform attribute list.
* Overflow from the inode has already been checked for.
*/
-int
-xfs_attr_shortform_add(xfs_da_args_t *args)
+void
+xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i, offset, size;
+ xfs_mount_t *mp;
xfs_inode_t *dp;
xfs_ifork_t *ifp;
dp = args->dp;
+ mp = dp->i_mount;
+ dp->i_d.di_forkoff = forkoff;
+ dp->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+ dp->i_afp->if_ext_max =
+ XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+
ifp = dp->i_afp;
ASSERT(ifp->if_flags & XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+#ifdef DEBUG
if (sfe->namelen != args->namelen)
continue;
if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
if (((args->flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0))
continue;
- return(XFS_ERROR(EEXIST));
+ ASSERT(0);
+#endif
}
offset = (char *)sfe - (char *)sf;
INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
- return(0);
+ xfs_sbversion_add_attr2(mp, args->trans);
}
/*
- * Remove a name from the shortform attribute list structure.
+ * Remove an attribute from the shortform attribute list structure.
*/
int
xfs_attr_shortform_remove(xfs_da_args_t *args)
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int base, size=0, end, totsize, i;
+ xfs_mount_t *mp;
xfs_inode_t *dp;
- /*
- * Remove the attribute.
- */
dp = args->dp;
+ mp = dp->i_mount;
base = sizeof(xfs_attr_sf_hdr_t);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
- for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
- sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
+ end = INT_GET(sf->hdr.count, ARCH_CONVERT);
+ for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
base += size, i++) {
size = XFS_ATTR_SF_ENTSIZE(sfe);
if (sfe->namelen != args->namelen)
continue;
break;
}
- if (i == INT_GET(sf->hdr.count, ARCH_CONVERT))
+ if (i == end)
return(XFS_ERROR(ENOATTR));
+ /*
+ * Fix up the attribute fork data, covering the hole
+ */
end = base + size;
totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
- if (end != totsize) {
- memmove(&((char *)sf)[base], &((char *)sf)[end],
- totsize - end);
- }
+ if (end != totsize)
+ memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end);
INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size);
- xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
- xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+
+ /*
+ * Fix up the start offset of the attribute fork
+ */
+ totsize -= size;
+ if (totsize == sizeof(xfs_attr_sf_hdr_t) && !args->addname) {
+ /*
+ * Last attribute now removed, revert to original
+ * inode format making all literal area available
+ * to the data fork once more.
+ */
+ xfs_idestroy_fork(dp, XFS_ATTR_FORK);
+ dp->i_d.di_forkoff = 0;
+ dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+ ASSERT(dp->i_d.di_anextents == 0);
+ ASSERT(dp->i_afp == NULL);
+ dp->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
+ } else {
+ xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
+ dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize);
+ ASSERT(dp->i_d.di_forkoff);
+ ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || args->addname);
+ dp->i_afp->if_ext_max =
+ XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+ dp->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+ xfs_trans_log_inode(args->trans, dp,
+ XFS_ILOG_CORE | XFS_ILOG_ADATA);
+ }
+
+ xfs_sbversion_add_attr2(mp, args->trans);
return(0);
}
+ name_loc->namelen
+ INT_GET(name_loc->valuelen, ARCH_CONVERT);
}
- return( bytes < XFS_IFORK_ASIZE(dp) );
+ if (bytes == sizeof(struct xfs_attr_sf_hdr))
+ return(-1);
+ return(xfs_attr_shortform_bytesfit(dp, bytes));
}
/*
* Convert a leaf attribute list to shortform attribute list
*/
int
-xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args)
+xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
error = xfs_da_shrink_inode(args, 0, bp);
if (error)
goto out;
- error = xfs_attr_shortform_create(args);
- if (error)
+
+ if (forkoff == -1) {
+ /*
+ * Last attribute was removed, revert to original
+ * inode format making all literal area available
+ * to the data fork once more.
+ */
+ xfs_idestroy_fork(dp, XFS_ATTR_FORK);
+ dp->i_d.di_forkoff = 0;
+ dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+ ASSERT(dp->i_d.di_anextents == 0);
+ ASSERT(dp->i_afp == NULL);
+ dp->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
goto out;
+ }
+
+ xfs_attr_shortform_create(args);
/*
* Copy the attributes
nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
- xfs_attr_shortform_add(&nargs);
+ xfs_attr_shortform_add(&nargs, forkoff);
}
error = 0;
projects / linux-block.git / blobdiff