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-rw-r--r--fs/afs/dir_edit.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/fs/afs/dir_edit.c b/fs/afs/dir_edit.c
new file mode 100644
index 000000000000..fd3aa9f97ce6
--- /dev/null
+++ b/fs/afs/dir_edit.c
@@ -0,0 +1,648 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* AFS filesystem directory editing
+ *
+ * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/pagemap.h>
+#include <linux/iversion.h>
+#include <linux/folio_queue.h>
+#include "internal.h"
+#include "xdr_fs.h"
+
+/*
+ * Find a number of contiguous clear bits in a directory block bitmask.
+ *
+ * There are 64 slots, which means we can load the entire bitmap into a
+ * variable. The first bit doesn't count as it corresponds to the block header
+ * slot. nr_slots is between 1 and 9.
+ */
+static int afs_find_contig_bits(union afs_xdr_dir_block *block, unsigned int nr_slots)
+{
+ u64 bitmap;
+ u32 mask;
+ int bit, n;
+
+ bitmap = (u64)block->hdr.bitmap[0] << 0 * 8;
+ bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
+ bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
+ bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
+ bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
+ bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
+ bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
+ bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
+ bitmap >>= 1; /* The first entry is metadata */
+ bit = 1;
+ mask = (1 << nr_slots) - 1;
+
+ do {
+ if (sizeof(unsigned long) == 8)
+ n = ffz(bitmap);
+ else
+ n = ((u32)bitmap) != 0 ?
+ ffz((u32)bitmap) :
+ ffz((u32)(bitmap >> 32)) + 32;
+ bitmap >>= n;
+ bit += n;
+
+ if ((bitmap & mask) == 0) {
+ if (bit > 64 - nr_slots)
+ return -1;
+ return bit;
+ }
+
+ n = __ffs(bitmap);
+ bitmap >>= n;
+ bit += n;
+ } while (bitmap);
+
+ return -1;
+}
+
+/*
+ * Set a number of contiguous bits in the directory block bitmap.
+ */
+static void afs_set_contig_bits(union afs_xdr_dir_block *block,
+ int bit, unsigned int nr_slots)
+{
+ u64 mask;
+
+ mask = (1 << nr_slots) - 1;
+ mask <<= bit;
+
+ block->hdr.bitmap[0] |= (u8)(mask >> 0 * 8);
+ block->hdr.bitmap[1] |= (u8)(mask >> 1 * 8);
+ block->hdr.bitmap[2] |= (u8)(mask >> 2 * 8);
+ block->hdr.bitmap[3] |= (u8)(mask >> 3 * 8);
+ block->hdr.bitmap[4] |= (u8)(mask >> 4 * 8);
+ block->hdr.bitmap[5] |= (u8)(mask >> 5 * 8);
+ block->hdr.bitmap[6] |= (u8)(mask >> 6 * 8);
+ block->hdr.bitmap[7] |= (u8)(mask >> 7 * 8);
+}
+
+/*
+ * Clear a number of contiguous bits in the directory block bitmap.
+ */
+static void afs_clear_contig_bits(union afs_xdr_dir_block *block,
+ int bit, unsigned int nr_slots)
+{
+ u64 mask;
+
+ mask = (1 << nr_slots) - 1;
+ mask <<= bit;
+
+ block->hdr.bitmap[0] &= ~(u8)(mask >> 0 * 8);
+ block->hdr.bitmap[1] &= ~(u8)(mask >> 1 * 8);
+ block->hdr.bitmap[2] &= ~(u8)(mask >> 2 * 8);
+ block->hdr.bitmap[3] &= ~(u8)(mask >> 3 * 8);
+ block->hdr.bitmap[4] &= ~(u8)(mask >> 4 * 8);
+ block->hdr.bitmap[5] &= ~(u8)(mask >> 5 * 8);
+ block->hdr.bitmap[6] &= ~(u8)(mask >> 6 * 8);
+ block->hdr.bitmap[7] &= ~(u8)(mask >> 7 * 8);
+}
+
+/*
+ * Get a specific block, extending the directory storage to cover it as needed.
+ */
+static union afs_xdr_dir_block *afs_dir_get_block(struct afs_dir_iter *iter, size_t block)
+{
+ struct folio_queue *fq;
+ struct afs_vnode *dvnode = iter->dvnode;
+ struct folio *folio;
+ size_t blpos = block * AFS_DIR_BLOCK_SIZE;
+ size_t blend = (block + 1) * AFS_DIR_BLOCK_SIZE, fpos = iter->fpos;
+ int ret;
+
+ if (dvnode->directory_size < blend) {
+ size_t cur_size = dvnode->directory_size;
+
+ ret = netfs_alloc_folioq_buffer(
+ NULL, &dvnode->directory, &cur_size, blend,
+ mapping_gfp_mask(dvnode->netfs.inode.i_mapping));
+ dvnode->directory_size = cur_size;
+ if (ret < 0)
+ goto fail;
+ }
+
+ fq = iter->fq;
+ if (!fq)
+ fq = dvnode->directory;
+
+ /* Search the folio queue for the folio containing the block... */
+ for (; fq; fq = fq->next) {
+ for (int s = iter->fq_slot; s < folioq_count(fq); s++) {
+ size_t fsize = folioq_folio_size(fq, s);
+
+ if (blend <= fpos + fsize) {
+ /* ... and then return the mapped block. */
+ folio = folioq_folio(fq, s);
+ if (WARN_ON_ONCE(folio_pos(folio) != fpos))
+ goto fail;
+ iter->fq = fq;
+ iter->fq_slot = s;
+ iter->fpos = fpos;
+ return kmap_local_folio(folio, blpos - fpos);
+ }
+ fpos += fsize;
+ }
+ iter->fq_slot = 0;
+ }
+
+fail:
+ iter->fq = NULL;
+ iter->fq_slot = 0;
+ afs_invalidate_dir(dvnode, afs_dir_invalid_edit_get_block);
+ return NULL;
+}
+
+/*
+ * Scan a directory block looking for a dirent of the right name.
+ */
+static int afs_dir_scan_block(const union afs_xdr_dir_block *block, const struct qstr *name,
+ unsigned int blocknum)
+{
+ const union afs_xdr_dirent *de;
+ u64 bitmap;
+ int d, len, n;
+
+ _enter("");
+
+ bitmap = (u64)block->hdr.bitmap[0] << 0 * 8;
+ bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
+ bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
+ bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
+ bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
+ bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
+ bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
+ bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
+
+ for (d = (blocknum == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
+ d < AFS_DIR_SLOTS_PER_BLOCK;
+ d++) {
+ if (!((bitmap >> d) & 1))
+ continue;
+ de = &block->dirents[d];
+ if (de->u.valid != 1)
+ continue;
+
+ /* The block was NUL-terminated by afs_dir_check_page(). */
+ len = strlen(de->u.name);
+ if (len == name->len &&
+ memcmp(de->u.name, name->name, name->len) == 0)
+ return d;
+
+ n = round_up(12 + len + 1 + 4, AFS_DIR_DIRENT_SIZE);
+ n /= AFS_DIR_DIRENT_SIZE;
+ d += n - 1;
+ }
+
+ return -1;
+}
+
+/*
+ * Initialise a new directory block. Note that block 0 is special and contains
+ * some extra metadata.
+ */
+static void afs_edit_init_block(union afs_xdr_dir_block *meta,
+ union afs_xdr_dir_block *block, int block_num)
+{
+ memset(block, 0, sizeof(*block));
+ block->hdr.npages = htons(1);
+ block->hdr.magic = AFS_DIR_MAGIC;
+ block->hdr.bitmap[0] = 1;
+
+ if (block_num == 0) {
+ block->hdr.bitmap[0] = 0xff;
+ block->hdr.bitmap[1] = 0x1f;
+ memset(block->meta.alloc_ctrs,
+ AFS_DIR_SLOTS_PER_BLOCK,
+ sizeof(block->meta.alloc_ctrs));
+ meta->meta.alloc_ctrs[0] =
+ AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS0;
+ }
+
+ if (block_num < AFS_DIR_BLOCKS_WITH_CTR)
+ meta->meta.alloc_ctrs[block_num] =
+ AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS;
+}
+
+/*
+ * Edit a directory's file data to add a new directory entry. Doing this after
+ * create, mkdir, symlink, link or rename if the data version number is
+ * incremented by exactly one avoids the need to re-download the entire
+ * directory contents.
+ *
+ * The caller must hold the inode locked.
+ */
+void afs_edit_dir_add(struct afs_vnode *vnode,
+ const struct qstr *name, struct afs_fid *new_fid,
+ enum afs_edit_dir_reason why)
+{
+ union afs_xdr_dir_block *meta, *block;
+ union afs_xdr_dirent *de;
+ struct afs_dir_iter iter = { .dvnode = vnode };
+ unsigned int nr_blocks, b, entry;
+ loff_t i_size;
+ int slot;
+
+ _enter(",,{%d,%s},", name->len, name->name);
+
+ i_size = i_size_read(&vnode->netfs.inode);
+ if (i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
+ (i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_add_bad_size);
+ return;
+ }
+
+ meta = afs_dir_get_block(&iter, 0);
+ if (!meta)
+ return;
+
+ /* Work out how many slots we're going to need. */
+ iter.nr_slots = afs_dir_calc_slots(name->len);
+
+ if (i_size == 0)
+ goto new_directory;
+ nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
+
+ /* Find a block that has sufficient slots available. Each folio
+ * contains two or more directory blocks.
+ */
+ for (b = 0; b < nr_blocks + 1; b++) {
+ /* If the directory extended into a new folio, then we need to
+ * tack a new folio on the end.
+ */
+ if (nr_blocks >= AFS_DIR_MAX_BLOCKS)
+ goto error_too_many_blocks;
+
+ /* Lower dir blocks have a counter in the header we can check. */
+ if (b < AFS_DIR_BLOCKS_WITH_CTR &&
+ meta->meta.alloc_ctrs[b] < iter.nr_slots)
+ continue;
+
+ block = afs_dir_get_block(&iter, b);
+ if (!block)
+ goto error;
+
+ /* Abandon the edit if we got a callback break. */
+ if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
+ goto already_invalidated;
+
+ _debug("block %u: %2u %3u %u",
+ b,
+ (b < AFS_DIR_BLOCKS_WITH_CTR) ? meta->meta.alloc_ctrs[b] : 99,
+ ntohs(block->hdr.npages),
+ ntohs(block->hdr.magic));
+
+ /* Initialise the block if necessary. */
+ if (b == nr_blocks) {
+ _debug("init %u", b);
+ afs_edit_init_block(meta, block, b);
+ afs_set_i_size(vnode, (b + 1) * AFS_DIR_BLOCK_SIZE);
+ }
+
+ /* We need to try and find one or more consecutive slots to
+ * hold the entry.
+ */
+ slot = afs_find_contig_bits(block, iter.nr_slots);
+ if (slot >= 0) {
+ _debug("slot %u", slot);
+ goto found_space;
+ }
+
+ kunmap_local(block);
+ }
+
+ /* There are no spare slots of sufficient size, yet the operation
+ * succeeded. Download the directory again.
+ */
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_create_nospc, 0, 0, 0, 0, name->name);
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_add_no_slots);
+ goto out_unmap;
+
+new_directory:
+ afs_edit_init_block(meta, meta, 0);
+ i_size = AFS_DIR_BLOCK_SIZE;
+ afs_set_i_size(vnode, i_size);
+ slot = AFS_DIR_RESV_BLOCKS0;
+ block = afs_dir_get_block(&iter, 0);
+ nr_blocks = 1;
+ b = 0;
+
+found_space:
+ /* Set the dirent slot. */
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_create, b, slot,
+ new_fid->vnode, new_fid->unique, name->name);
+ de = &block->dirents[slot];
+ de->u.valid = 1;
+ de->u.unused[0] = 0;
+ de->u.hash_next = 0; // TODO: Really need to maintain this
+ de->u.vnode = htonl(new_fid->vnode);
+ de->u.unique = htonl(new_fid->unique);
+ memcpy(de->u.name, name->name, name->len + 1);
+ de->u.name[name->len] = 0;
+
+ /* Adjust the bitmap. */
+ afs_set_contig_bits(block, slot, iter.nr_slots);
+
+ /* Adjust the allocation counter. */
+ if (b < AFS_DIR_BLOCKS_WITH_CTR)
+ meta->meta.alloc_ctrs[b] -= iter.nr_slots;
+
+ /* Adjust the hash chain. */
+ entry = b * AFS_DIR_SLOTS_PER_BLOCK + slot;
+ iter.bucket = afs_dir_hash_name(name);
+ de->u.hash_next = meta->meta.hashtable[iter.bucket];
+ meta->meta.hashtable[iter.bucket] = htons(entry);
+ kunmap_local(block);
+
+ inode_inc_iversion_raw(&vnode->netfs.inode);
+ afs_stat_v(vnode, n_dir_cr);
+ _debug("Insert %s in %u[%u]", name->name, b, slot);
+
+ netfs_single_mark_inode_dirty(&vnode->netfs.inode);
+
+out_unmap:
+ kunmap_local(meta);
+ _leave("");
+ return;
+
+already_invalidated:
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_create_inval, 0, 0, 0, 0, name->name);
+ kunmap_local(block);
+ goto out_unmap;
+
+error_too_many_blocks:
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_add_too_many_blocks);
+error:
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_create_error, 0, 0, 0, 0, name->name);
+ goto out_unmap;
+}
+
+/*
+ * Edit a directory's file data to remove a new directory entry. Doing this
+ * after unlink, rmdir or rename if the data version number is incremented by
+ * exactly one avoids the need to re-download the entire directory contents.
+ *
+ * The caller must hold the inode locked.
+ */
+void afs_edit_dir_remove(struct afs_vnode *vnode,
+ const struct qstr *name, enum afs_edit_dir_reason why)
+{
+ union afs_xdr_dir_block *meta, *block, *pblock;
+ union afs_xdr_dirent *de, *pde;
+ struct afs_dir_iter iter = { .dvnode = vnode };
+ struct afs_fid fid;
+ unsigned int b, slot, entry;
+ loff_t i_size;
+ __be16 next;
+ int found;
+
+ _enter(",,{%d,%s},", name->len, name->name);
+
+ i_size = i_size_read(&vnode->netfs.inode);
+ if (i_size < AFS_DIR_BLOCK_SIZE ||
+ i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
+ (i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_rem_bad_size);
+ return;
+ }
+
+ if (!afs_dir_init_iter(&iter, name))
+ return;
+
+ meta = afs_dir_find_block(&iter, 0);
+ if (!meta)
+ return;
+
+ /* Find the entry in the blob. */
+ found = afs_dir_search_bucket(&iter, name, &fid);
+ if (found < 0) {
+ /* Didn't find the dirent to clobber. Re-download. */
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_noent,
+ 0, 0, 0, 0, name->name);
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_rem_wrong_name);
+ goto out_unmap;
+ }
+
+ entry = found;
+ b = entry / AFS_DIR_SLOTS_PER_BLOCK;
+ slot = entry % AFS_DIR_SLOTS_PER_BLOCK;
+
+ block = afs_dir_find_block(&iter, b);
+ if (!block)
+ goto error;
+ if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
+ goto already_invalidated;
+
+ /* Check and clear the entry. */
+ de = &block->dirents[slot];
+ if (de->u.valid != 1)
+ goto error_unmap;
+
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_delete, b, slot,
+ ntohl(de->u.vnode), ntohl(de->u.unique),
+ name->name);
+
+ /* Adjust the bitmap. */
+ afs_clear_contig_bits(block, slot, iter.nr_slots);
+
+ /* Adjust the allocation counter. */
+ if (b < AFS_DIR_BLOCKS_WITH_CTR)
+ meta->meta.alloc_ctrs[b] += iter.nr_slots;
+
+ /* Clear the constituent entries. */
+ next = de->u.hash_next;
+ memset(de, 0, sizeof(*de) * iter.nr_slots);
+ kunmap_local(block);
+
+ /* Adjust the hash chain: if iter->prev_entry is 0, the hashtable head
+ * index is previous; otherwise it's slot number of the previous entry.
+ */
+ if (!iter.prev_entry) {
+ __be16 prev_next = meta->meta.hashtable[iter.bucket];
+
+ if (unlikely(prev_next != htons(entry))) {
+ pr_warn("%llx:%llx:%x: not head of chain b=%x p=%x,%x e=%x %*s",
+ vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
+ iter.bucket, iter.prev_entry, prev_next, entry,
+ name->len, name->name);
+ goto error;
+ }
+ meta->meta.hashtable[iter.bucket] = next;
+ } else {
+ unsigned int pb = iter.prev_entry / AFS_DIR_SLOTS_PER_BLOCK;
+ unsigned int ps = iter.prev_entry % AFS_DIR_SLOTS_PER_BLOCK;
+ __be16 prev_next;
+
+ pblock = afs_dir_find_block(&iter, pb);
+ if (!pblock)
+ goto error;
+ pde = &pblock->dirents[ps];
+ prev_next = pde->u.hash_next;
+ if (prev_next != htons(entry)) {
+ kunmap_local(pblock);
+ pr_warn("%llx:%llx:%x: not prev in chain b=%x p=%x,%x e=%x %*s",
+ vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
+ iter.bucket, iter.prev_entry, prev_next, entry,
+ name->len, name->name);
+ goto error;
+ }
+ pde->u.hash_next = next;
+ kunmap_local(pblock);
+ }
+
+ netfs_single_mark_inode_dirty(&vnode->netfs.inode);
+
+ inode_set_iversion_raw(&vnode->netfs.inode, vnode->status.data_version);
+ afs_stat_v(vnode, n_dir_rm);
+ _debug("Remove %s from %u[%u]", name->name, b, slot);
+
+out_unmap:
+ kunmap_local(meta);
+ _leave("");
+ return;
+
+already_invalidated:
+ kunmap_local(block);
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_inval,
+ 0, 0, 0, 0, name->name);
+ goto out_unmap;
+
+error_unmap:
+ kunmap_local(block);
+error:
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_error,
+ 0, 0, 0, 0, name->name);
+ goto out_unmap;
+}
+
+/*
+ * Edit an entry in a directory to update the vnode it refers to. This is also
+ * used to update the ".." entry in a directory.
+ */
+void afs_edit_dir_update(struct afs_vnode *vnode, const struct qstr *name,
+ struct afs_vnode *new_dvnode, enum afs_edit_dir_reason why)
+{
+ union afs_xdr_dir_block *block;
+ union afs_xdr_dirent *de;
+ struct afs_dir_iter iter = { .dvnode = vnode };
+ unsigned int nr_blocks, b;
+ loff_t i_size;
+ int slot;
+
+ _enter("");
+
+ i_size = i_size_read(&vnode->netfs.inode);
+ if (i_size < AFS_DIR_BLOCK_SIZE) {
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_upd_bad_size);
+ return;
+ }
+
+ nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
+
+ /* Find a block that has sufficient slots available. Each folio
+ * contains two or more directory blocks.
+ */
+ for (b = 0; b < nr_blocks; b++) {
+ block = afs_dir_get_block(&iter, b);
+ if (!block)
+ goto error;
+
+ /* Abandon the edit if we got a callback break. */
+ if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
+ goto already_invalidated;
+
+ slot = afs_dir_scan_block(block, name, b);
+ if (slot >= 0)
+ goto found_dirent;
+
+ kunmap_local(block);
+ }
+
+ /* Didn't find the dirent to clobber. Download the directory again. */
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_update_nodd,
+ 0, 0, 0, 0, name->name);
+ afs_invalidate_dir(vnode, afs_dir_invalid_edit_upd_no_dd);
+ goto out;
+
+found_dirent:
+ de = &block->dirents[slot];
+ de->u.vnode = htonl(new_dvnode->fid.vnode);
+ de->u.unique = htonl(new_dvnode->fid.unique);
+
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_update_dd, b, slot,
+ ntohl(de->u.vnode), ntohl(de->u.unique), name->name);
+
+ kunmap_local(block);
+ netfs_single_mark_inode_dirty(&vnode->netfs.inode);
+ inode_set_iversion_raw(&vnode->netfs.inode, vnode->status.data_version);
+
+out:
+ _leave("");
+ return;
+
+already_invalidated:
+ kunmap_local(block);
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_update_inval,
+ 0, 0, 0, 0, name->name);
+ goto out;
+
+error:
+ trace_afs_edit_dir(vnode, why, afs_edit_dir_update_error,
+ 0, 0, 0, 0, name->name);
+ goto out;
+}
+
+/*
+ * Initialise a new directory. We need to fill in the "." and ".." entries.
+ */
+void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_dvnode)
+{
+ union afs_xdr_dir_block *meta;
+ struct afs_dir_iter iter = { .dvnode = dvnode };
+ union afs_xdr_dirent *de;
+ unsigned int slot = AFS_DIR_RESV_BLOCKS0;
+ loff_t i_size;
+
+ i_size = i_size_read(&dvnode->netfs.inode);
+ if (i_size != AFS_DIR_BLOCK_SIZE) {
+ afs_invalidate_dir(dvnode, afs_dir_invalid_edit_add_bad_size);
+ return;
+ }
+
+ meta = afs_dir_get_block(&iter, 0);
+ if (!meta)
+ return;
+
+ afs_edit_init_block(meta, meta, 0);
+
+ de = &meta->dirents[slot];
+ de->u.valid = 1;
+ de->u.vnode = htonl(dvnode->fid.vnode);
+ de->u.unique = htonl(dvnode->fid.unique);
+ memcpy(de->u.name, ".", 2);
+ trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+ dvnode->fid.vnode, dvnode->fid.unique, ".");
+ slot++;
+
+ de = &meta->dirents[slot];
+ de->u.valid = 1;
+ de->u.vnode = htonl(parent_dvnode->fid.vnode);
+ de->u.unique = htonl(parent_dvnode->fid.unique);
+ memcpy(de->u.name, "..", 3);
+ trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+ parent_dvnode->fid.vnode, parent_dvnode->fid.unique, "..");
+
+ afs_set_contig_bits(meta, AFS_DIR_RESV_BLOCKS0, 2);
+ meta->meta.alloc_ctrs[0] -= 2;
+ kunmap_local(meta);
+
+ netfs_single_mark_inode_dirty(&dvnode->netfs.inode);
+ set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
+ set_bit(AFS_VNODE_DIR_READ, &dvnode->flags);
+}
generated by cgit (git 2.34.1) at 2025-12-21 21:32:59 +0000