Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* AFS filesystem directory editing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "xdr_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * Find a number of contiguous clear bits in a directory block bitmask.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * There are 64 slots, which means we can load the entire bitmap into a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * variable.  The first bit doesn't count as it corresponds to the block header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * slot.  nr_slots is between 1 and 9.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static int afs_find_contig_bits(union afs_xdr_dir_block *block, unsigned int nr_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	u64 bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	int bit, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	bitmap  = (u64)block->hdr.bitmap[0] << 0 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	bitmap >>= 1; /* The first entry is metadata */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	bit = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	mask = (1 << nr_slots) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		if (sizeof(unsigned long) == 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			n = ffz(bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			n = ((u32)bitmap) != 0 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 				ffz((u32)bitmap) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 				ffz((u32)(bitmap >> 32)) + 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		bitmap >>= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		bit += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		if ((bitmap & mask) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			if (bit > 64 - nr_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 				return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			return bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		n = __ffs(bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		bitmap >>= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		bit += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	} while (bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * Set a number of contiguous bits in the directory block bitmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void afs_set_contig_bits(union afs_xdr_dir_block *block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 				int bit, unsigned int nr_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	u64 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	mask = (1 << nr_slots) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	mask <<= bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	block->hdr.bitmap[0] |= (u8)(mask >> 0 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	block->hdr.bitmap[1] |= (u8)(mask >> 1 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	block->hdr.bitmap[2] |= (u8)(mask >> 2 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	block->hdr.bitmap[3] |= (u8)(mask >> 3 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	block->hdr.bitmap[4] |= (u8)(mask >> 4 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	block->hdr.bitmap[5] |= (u8)(mask >> 5 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	block->hdr.bitmap[6] |= (u8)(mask >> 6 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	block->hdr.bitmap[7] |= (u8)(mask >> 7 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * Clear a number of contiguous bits in the directory block bitmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static void afs_clear_contig_bits(union afs_xdr_dir_block *block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 				  int bit, unsigned int nr_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	u64 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	mask = (1 << nr_slots) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	mask <<= bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	block->hdr.bitmap[0] &= ~(u8)(mask >> 0 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	block->hdr.bitmap[1] &= ~(u8)(mask >> 1 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	block->hdr.bitmap[2] &= ~(u8)(mask >> 2 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	block->hdr.bitmap[3] &= ~(u8)(mask >> 3 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	block->hdr.bitmap[4] &= ~(u8)(mask >> 4 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	block->hdr.bitmap[5] &= ~(u8)(mask >> 5 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	block->hdr.bitmap[6] &= ~(u8)(mask >> 6 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	block->hdr.bitmap[7] &= ~(u8)(mask >> 7 * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * Scan a directory block looking for a dirent of the right name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int afs_dir_scan_block(union afs_xdr_dir_block *block, struct qstr *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			      unsigned int blocknum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	union afs_xdr_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	u64 bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int d, len, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	_enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	bitmap  = (u64)block->hdr.bitmap[0] << 0 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	for (d = (blocknum == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	     d < AFS_DIR_SLOTS_PER_BLOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	     d++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (!((bitmap >> d) & 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		de = &block->dirents[d];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		if (de->u.valid != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		/* The block was NUL-terminated by afs_dir_check_page(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		len = strlen(de->u.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if (len == name->len &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		    memcmp(de->u.name, name->name, name->len) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			return d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		n = round_up(12 + len + 1 + 4, AFS_DIR_DIRENT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		n /= AFS_DIR_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		d += n - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  * Initialise a new directory block.  Note that block 0 is special and contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  * some extra metadata.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static void afs_edit_init_block(union afs_xdr_dir_block *meta,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				union afs_xdr_dir_block *block, int block_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	memset(block, 0, sizeof(*block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	block->hdr.npages = htons(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	block->hdr.magic = AFS_DIR_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	block->hdr.bitmap[0] = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (block_num == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		block->hdr.bitmap[0] = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		block->hdr.bitmap[1] = 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		memset(block->meta.alloc_ctrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		       AFS_DIR_SLOTS_PER_BLOCK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		       sizeof(block->meta.alloc_ctrs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		meta->meta.alloc_ctrs[0] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (block_num < AFS_DIR_BLOCKS_WITH_CTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		meta->meta.alloc_ctrs[block_num] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * Edit a directory's file data to add a new directory entry.  Doing this after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * create, mkdir, symlink, link or rename if the data version number is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * incremented by exactly one avoids the need to re-download the entire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * directory contents.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * The caller must hold the inode locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) void afs_edit_dir_add(struct afs_vnode *vnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		      struct qstr *name, struct afs_fid *new_fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		      enum afs_edit_dir_reason why)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	union afs_xdr_dir_block *meta, *block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	struct afs_xdr_dir_page *meta_page, *dir_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	union afs_xdr_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct page *page0, *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	unsigned int need_slots, nr_blocks, b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	pgoff_t index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	loff_t i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	gfp_t gfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	_enter(",,{%d,%s},", name->len, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	i_size = i_size_read(&vnode->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	    (i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	gfp = vnode->vfs_inode.i_mapping->gfp_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	page0 = find_or_create_page(vnode->vfs_inode.i_mapping, 0, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (!page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		_leave(" [fgp]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	/* Work out how many slots we're going to need. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	need_slots = round_up(12 + name->len + 1 + 4, AFS_DIR_DIRENT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	need_slots /= AFS_DIR_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	meta_page = kmap(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	meta = &meta_page->blocks[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (i_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		goto new_directory;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	/* Find a block that has sufficient slots available.  Each VM page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * contains two or more directory blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	for (b = 0; b < nr_blocks + 1; b++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		/* If the directory extended into a new page, then we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		 * tack a new page on the end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		index = b / AFS_DIR_BLOCKS_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		if (index == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			page = page0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			dir_page = meta_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			if (nr_blocks >= AFS_DIR_MAX_BLOCKS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 				goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			gfp = vnode->vfs_inode.i_mapping->gfp_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			page = find_or_create_page(vnode->vfs_inode.i_mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 						   index, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 				goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			if (!PagePrivate(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 				attach_page_private(page, (void *)1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			dir_page = kmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		/* Abandon the edit if we got a callback break. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			goto invalidated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		block = &dir_page->blocks[b % AFS_DIR_BLOCKS_PER_PAGE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		_debug("block %u: %2u %3u %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		       b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		       (b < AFS_DIR_BLOCKS_WITH_CTR) ? meta->meta.alloc_ctrs[b] : 99,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		       ntohs(block->hdr.npages),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		       ntohs(block->hdr.magic));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		/* Initialise the block if necessary. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		if (b == nr_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			_debug("init %u", b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			afs_edit_init_block(meta, block, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			afs_set_i_size(vnode, (b + 1) * AFS_DIR_BLOCK_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		/* Only lower dir pages have a counter in the header. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		if (b >= AFS_DIR_BLOCKS_WITH_CTR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		    meta->meta.alloc_ctrs[b] >= need_slots) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			/* We need to try and find one or more consecutive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			 * slots to hold the entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			slot = afs_find_contig_bits(block, need_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			if (slot >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 				_debug("slot %u", slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 				goto found_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	/* There are no spare slots of sufficient size, yet the operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	 * succeeded.  Download the directory again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_create_nospc, 0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) new_directory:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	afs_edit_init_block(meta, meta, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	i_size = AFS_DIR_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	afs_set_i_size(vnode, i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	slot = AFS_DIR_RESV_BLOCKS0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	page = page0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	block = meta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	nr_blocks = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	b = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) found_space:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	/* Set the dirent slot. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_create, b, slot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 			   new_fid->vnode, new_fid->unique, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	de = &block->dirents[slot];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	de->u.valid	= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	de->u.unused[0]	= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	de->u.hash_next	= 0; // TODO: Really need to maintain this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	de->u.vnode	= htonl(new_fid->vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	de->u.unique	= htonl(new_fid->unique);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	memcpy(de->u.name, name->name, name->len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	de->u.name[name->len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	/* Adjust the bitmap. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	afs_set_contig_bits(block, slot, need_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	/* Adjust the allocation counter. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	if (b < AFS_DIR_BLOCKS_WITH_CTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		meta->meta.alloc_ctrs[b] -= need_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	inode_inc_iversion_raw(&vnode->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	afs_stat_v(vnode, n_dir_cr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	_debug("Insert %s in %u[%u]", name->name, b, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) out_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	unlock_page(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	kunmap(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	put_page(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	_leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) invalidated:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_create_inval, 0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_create_error, 0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)  * Edit a directory's file data to remove a new directory entry.  Doing this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)  * after unlink, rmdir or rename if the data version number is incremented by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  * exactly one avoids the need to re-download the entire directory contents.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  * The caller must hold the inode locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) void afs_edit_dir_remove(struct afs_vnode *vnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			 struct qstr *name, enum afs_edit_dir_reason why)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	struct afs_xdr_dir_page *meta_page, *dir_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	union afs_xdr_dir_block *meta, *block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	union afs_xdr_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	struct page *page0, *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	unsigned int need_slots, nr_blocks, b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	pgoff_t index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	loff_t i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	_enter(",,{%d,%s},", name->len, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	i_size = i_size_read(&vnode->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	if (i_size < AFS_DIR_BLOCK_SIZE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	    i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	    (i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	page0 = find_lock_page(vnode->vfs_inode.i_mapping, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (!page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		_leave(" [fgp]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	/* Work out how many slots we're going to discard. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	need_slots = round_up(12 + name->len + 1 + 4, AFS_DIR_DIRENT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	need_slots /= AFS_DIR_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	meta_page = kmap(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	meta = &meta_page->blocks[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	/* Find a page that has sufficient slots available.  Each VM page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	 * contains two or more directory blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	for (b = 0; b < nr_blocks; b++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 		index = b / AFS_DIR_BLOCKS_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		if (index != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 			page = find_lock_page(vnode->vfs_inode.i_mapping, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 			if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 				goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 			dir_page = kmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 			page = page0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 			dir_page = meta_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		/* Abandon the edit if we got a callback break. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			goto invalidated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		block = &dir_page->blocks[b % AFS_DIR_BLOCKS_PER_PAGE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		if (b > AFS_DIR_BLOCKS_WITH_CTR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		    meta->meta.alloc_ctrs[b] <= AFS_DIR_SLOTS_PER_BLOCK - 1 - need_slots) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 			slot = afs_dir_scan_block(block, name, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 			if (slot >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 				goto found_dirent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 			unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 			kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 			put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	/* Didn't find the dirent to clobber.  Download the directory again. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_noent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 			   0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) found_dirent:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	de = &block->dirents[slot];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_delete, b, slot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 			   ntohl(de->u.vnode), ntohl(de->u.unique),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 			   name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	memset(de, 0, sizeof(*de) * need_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	/* Adjust the bitmap. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	afs_clear_contig_bits(block, slot, need_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 		unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 		kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 		put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	/* Adjust the allocation counter. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 	if (b < AFS_DIR_BLOCKS_WITH_CTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 		meta->meta.alloc_ctrs[b] += need_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	inode_set_iversion_raw(&vnode->vfs_inode, vnode->status.data_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	afs_stat_v(vnode, n_dir_rm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	_debug("Remove %s from %u[%u]", name->name, b, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) out_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	unlock_page(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	kunmap(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	put_page(page0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	_leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) invalidated:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_inval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 			   0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	if (page != page0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 		unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 		kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 		put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 	trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_error,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 			   0, 0, 0, 0, name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 	clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 	goto out_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }