^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/sysv/itree.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Handling of indirect blocks' trees.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * AV, Sep--Dec 2000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "sysv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) enum {DIRECT = 10, DEPTH = 4}; /* Have triple indirect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static inline void dirty_indirect(struct buffer_head *bh, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) mark_buffer_dirty_inode(bh, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) if (IS_SYNC(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) sync_dirty_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int block_to_path(struct inode *inode, long block, int offsets[DEPTH])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct sysv_sb_info *sbi = SYSV_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int ptrs_bits = sbi->s_ind_per_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned long indirect_blocks = sbi->s_ind_per_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) double_blocks = sbi->s_ind_per_block_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (block < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) printk("sysv_block_map: block < 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) } else if (block < DIRECT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) } else if ( (block -= DIRECT) < indirect_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) offsets[n++] = DIRECT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) } else if ((block -= indirect_blocks) < double_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) offsets[n++] = DIRECT+1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) offsets[n++] = block >> ptrs_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) offsets[n++] = block & (indirect_blocks - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) } else if (((block -= double_blocks) >> (ptrs_bits * 2)) < indirect_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) offsets[n++] = DIRECT+2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) offsets[n++] = block >> (ptrs_bits * 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) offsets[n++] = (block >> ptrs_bits) & (indirect_blocks - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) offsets[n++] = block & (indirect_blocks - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* nothing */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static inline int block_to_cpu(struct sysv_sb_info *sbi, sysv_zone_t nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return sbi->s_block_base + fs32_to_cpu(sbi, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) typedef struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) sysv_zone_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) sysv_zone_t key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) } Indirect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static DEFINE_RWLOCK(pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline void add_chain(Indirect *p, struct buffer_head *bh, sysv_zone_t *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) p->key = *(p->p = v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) p->bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static inline int verify_chain(Indirect *from, Indirect *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) while (from <= to && from->key == *from->p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) from++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return (from > to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static inline sysv_zone_t *block_end(struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return (sysv_zone_t*)((char*)bh->b_data + bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^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) * Requires read_lock(&pointers_lock) or write_lock(&pointers_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static Indirect *get_branch(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int depth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int offsets[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) Indirect chain[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int *err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) Indirect *p = chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) add_chain(chain, NULL, SYSV_I(inode)->i_data + *offsets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (!p->key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto no_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) while (--depth) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int block = block_to_cpu(SYSV_SB(sb), p->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) bh = sb_bread(sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) goto failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!verify_chain(chain, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) goto changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) add_chain(++p, bh, (sysv_zone_t*)bh->b_data + *++offsets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!p->key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) goto no_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) changed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) *err = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) goto no_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) *err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) no_block:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int alloc_branch(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) int *offsets,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) Indirect *branch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int blocksize = inode->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) branch[0].key = sysv_new_block(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (branch[0].key) for (n = 1; n < num; n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* Allocate the next block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) branch[n].key = sysv_new_block(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (!branch[n].key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * Get buffer_head for parent block, zero it out and set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * the pointer to new one, then send parent to disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) parent = block_to_cpu(SYSV_SB(inode->i_sb), branch[n-1].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) bh = sb_getblk(inode->i_sb, parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) memset(bh->b_data, 0, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) branch[n].bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) branch[n].p = (sysv_zone_t*) bh->b_data + offsets[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) *branch[n].p = branch[n].key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) set_buffer_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) dirty_indirect(bh, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (n == num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* Allocation failed, free what we already allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) for (i = 1; i < n; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) bforget(branch[i].bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) for (i = 0; i < n; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) sysv_free_block(inode->i_sb, branch[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static inline int splice_branch(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) Indirect chain[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) Indirect *where,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Verify that place we are splicing to is still there and vacant */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) write_lock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (!verify_chain(chain, where-1) || *where->p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) goto changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) *where->p = where->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) write_unlock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /* had we spliced it onto indirect block? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (where->bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) dirty_indirect(where->bh, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (IS_SYNC(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) sysv_sync_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) changed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) write_unlock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) for (i = 1; i < num; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) bforget(where[i].bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) for (i = 0; i < num; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) sysv_free_block(inode->i_sb, where[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) int offsets[DEPTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) Indirect chain[DEPTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) Indirect *partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) int left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int depth = block_to_path(inode, iblock, offsets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (depth == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) reread:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) read_lock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) partial = get_branch(inode, depth, offsets, chain, &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) read_unlock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* Simplest case - block found, no allocation needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (!partial) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) got_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) map_bh(bh_result, sb, block_to_cpu(SYSV_SB(sb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) chain[depth-1].key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Clean up and exit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) partial = chain+depth-1; /* the whole chain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* Next simple case - plain lookup or failed read of indirect block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (!create || err == -EIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) while (partial > chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) brelse(partial->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) partial--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * Indirect block might be removed by truncate while we were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * reading it. Handling of that case (forget what we've got and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * reread) is taken out of the main path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (err == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) goto changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) left = (chain + depth) - partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) err = alloc_branch(inode, left, offsets+(partial-chain), partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (splice_branch(inode, chain, partial, left) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) goto changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) set_buffer_new(bh_result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) goto got_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) changed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) while (partial > chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) brelse(partial->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) partial--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) goto reread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static inline int all_zeroes(sysv_zone_t *p, sysv_zone_t *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) while (p < q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (*p++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static Indirect *find_shared(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) int depth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) int offsets[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) Indirect chain[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) sysv_zone_t *top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) Indirect *partial, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) int k, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) *top = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) for (k = depth; k > 1 && !offsets[k-1]; k--)
^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) write_lock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) partial = get_branch(inode, k, offsets, chain, &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (!partial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) partial = chain + k-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * If the branch acquired continuation since we've looked at it -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * fine, it should all survive and (new) top doesn't belong to us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (!partial->key && *partial->p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) write_unlock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) goto no_top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) for (p=partial; p>chain && all_zeroes((sysv_zone_t*)p->bh->b_data,p->p); p--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * OK, we've found the last block that must survive. The rest of our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * branch should be detached before unlocking. However, if that rest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * of branch is all ours and does not grow immediately from the inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * it's easier to cheat and just decrement partial->p.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (p == chain + k - 1 && p > chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) p->p--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) *top = *p->p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) *p->p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) write_unlock(&pointers_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) while (partial > p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) brelse(partial->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) partial--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) no_top:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static inline void free_data(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) for ( ; p < q ; p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) sysv_zone_t nr = *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) *p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) sysv_free_block(inode->i_sb, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) static void free_branches(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q, int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct buffer_head * bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (depth--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) for ( ; p < q ; p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) int block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) sysv_zone_t nr = *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (!nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) *p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) block = block_to_cpu(SYSV_SB(sb), nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) bh = sb_bread(sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) free_branches(inode, (sysv_zone_t*)bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) block_end(bh), depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) bforget(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) sysv_free_block(sb, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) free_data(inode, p, q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) void sysv_truncate (struct inode * inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) sysv_zone_t *i_data = SYSV_I(inode)->i_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) int offsets[DEPTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) Indirect chain[DEPTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) Indirect *partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) sysv_zone_t nr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) long iblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) unsigned blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) S_ISLNK(inode->i_mode)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) blocksize = inode->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) iblock = (inode->i_size + blocksize-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) >> inode->i_sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) block_truncate_page(inode->i_mapping, inode->i_size, get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) n = block_to_path(inode, iblock, offsets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (n == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (n == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) free_data(inode, i_data+offsets[0], i_data + DIRECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) goto do_indirects;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) partial = find_shared(inode, n, offsets, chain, &nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) /* Kill the top of shared branch (already detached) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (partial == chain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) dirty_indirect(partial->bh, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) free_branches(inode, &nr, &nr+1, (chain+n-1) - partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /* Clear the ends of indirect blocks on the shared branch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) while (partial > chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) free_branches(inode, partial->p + 1, block_end(partial->bh),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) (chain+n-1) - partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) dirty_indirect(partial->bh, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) brelse (partial->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) partial--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) do_indirects:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) /* Kill the remaining (whole) subtrees (== subtrees deeper than...) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) while (n < DEPTH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) nr = i_data[DIRECT + n - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) i_data[DIRECT + n - 1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) free_branches(inode, &nr, &nr+1, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) n++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) inode->i_mtime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (IS_SYNC(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) sysv_sync_inode (inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) static unsigned sysv_nblocks(struct super_block *s, loff_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) struct sysv_sb_info *sbi = SYSV_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) int ptrs_bits = sbi->s_ind_per_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) unsigned blocks, res, direct = DIRECT, i = DEPTH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) blocks = (size + s->s_blocksize - 1) >> s->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) res = blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) while (--i && blocks > direct) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) blocks = ((blocks - direct - 1) >> ptrs_bits) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) res += blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) direct = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) int sysv_getattr(const struct path *path, struct kstat *stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) u32 request_mask, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct super_block *s = path->dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) generic_fillattr(d_inode(path->dentry), stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) stat->blocks = (s->s_blocksize / 512) * sysv_nblocks(s, stat->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) stat->blksize = s->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) static int sysv_writepage(struct page *page, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return block_write_full_page(page,get_block,wbc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static int sysv_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) return block_read_full_page(page,get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return __block_write_begin(page, pos, len, get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static void sysv_write_failed(struct address_space *mapping, loff_t to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (to > inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) truncate_pagecache(inode, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) sysv_truncate(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) static int sysv_write_begin(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) struct page **pagep, void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) ret = block_write_begin(mapping, pos, len, flags, pagep, get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sysv_write_failed(mapping, pos + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) return generic_block_bmap(mapping,block,get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) const struct address_space_operations sysv_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) .readpage = sysv_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) .writepage = sysv_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) .write_begin = sysv_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) .write_end = generic_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) .bmap = sysv_bmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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