29b24f6ca112d drivers/staging/erofs/dir.c (Gao Xiang 2019-07-31 23:57:31 +0800 1) // SPDX-License-Identifier: GPL-2.0-only
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 2) /*
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 3) * Copyright (C) 2017-2018 HUAWEI, Inc.
592e7cd00bb9d fs/erofs/dir.c (Alexander A. Klimov 2020-07-13 15:09:44 +0200 4) * https://www.huawei.com/
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 5) * Created by Gao Xiang <gaoxiang25@huawei.com>
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 6) */
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 7) #include "internal.h"
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 8)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 9) static void debug_one_dentry(unsigned char d_type, const char *de_name,
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 10) unsigned int de_namelen)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 11) {
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 12) #ifdef CONFIG_EROFS_FS_DEBUG
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 13) /* since the on-disk name could not have the trailing '\0' */
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 14) unsigned char dbg_namebuf[EROFS_NAME_LEN + 1];
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 15)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 16) memcpy(dbg_namebuf, de_name, de_namelen);
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 17) dbg_namebuf[de_namelen] = '\0';
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 18)
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 19) erofs_dbg("found dirent %s de_len %u d_type %d", dbg_namebuf,
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 20) de_namelen, d_type);
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 21) #endif
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 22) }
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 23)
a6b9b1d5eae61 drivers/staging/erofs/dir.c (Gao Xiang 2019-08-14 18:37:03 +0800 24) static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
cbebe5d05dd7f drivers/staging/erofs/dir.c (Bhanusree Pola 2019-02-19 14:55:25 +0530 25) void *dentry_blk, unsigned int *ofs,
cbebe5d05dd7f drivers/staging/erofs/dir.c (Bhanusree Pola 2019-02-19 14:55:25 +0530 26) unsigned int nameoff, unsigned int maxsize)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 27) {
5c8004ce6149a drivers/staging/erofs/dir.c (Colin Ian King 2019-06-17 13:55:29 +0100 28) struct erofs_dirent *de = dentry_blk + *ofs;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 29) const struct erofs_dirent *end = dentry_blk + nameoff;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 30)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 31) while (de < end) {
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 32) const char *de_name;
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 33) unsigned int de_namelen;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 34) unsigned char d_type;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 35)
1d819c5406d8a drivers/staging/erofs/dir.c (Gao Xiang 2019-08-16 15:11:42 +0800 36) d_type = fs_ftype_to_dtype(de->file_type);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 37)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 38) nameoff = le16_to_cpu(de->nameoff);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 39) de_name = (char *)dentry_blk + nameoff;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 40)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 41) /* the last dirent in the block? */
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 42) if (de + 1 >= end)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 43) de_namelen = strnlen(de_name, maxsize - nameoff);
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 44) else
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 45) de_namelen = le16_to_cpu(de[1].nameoff) - nameoff;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 46)
8b987bca2d096 drivers/staging/erofs/dir.c (Gao Xiang 2018-12-05 21:23:13 +0800 47) /* a corrupted entry is found */
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 48) if (nameoff + de_namelen > maxsize ||
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 49) de_namelen > EROFS_NAME_LEN) {
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 50) erofs_err(dir->i_sb, "bogus dirent @ nid %llu",
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 51) EROFS_I(dir)->nid);
8b987bca2d096 drivers/staging/erofs/dir.c (Gao Xiang 2018-12-05 21:23:13 +0800 52) DBG_BUGON(1);
a6b9b1d5eae61 drivers/staging/erofs/dir.c (Gao Xiang 2019-08-14 18:37:03 +0800 53) return -EFSCORRUPTED;
8b987bca2d096 drivers/staging/erofs/dir.c (Gao Xiang 2018-12-05 21:23:13 +0800 54) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 55)
33bac912840fe drivers/staging/erofs/dir.c (Gao Xiang 2019-03-29 04:14:58 +0800 56) debug_one_dentry(d_type, de_name, de_namelen);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 57) if (!dir_emit(ctx, de_name, de_namelen,
019ec6c14fbdf drivers/staging/erofs/dir.c (Aaron Strahlberger 2018-12-11 11:54:41 +0100 58) le64_to_cpu(de->nid), d_type))
019ec6c14fbdf drivers/staging/erofs/dir.c (Aaron Strahlberger 2018-12-11 11:54:41 +0100 59) /* stopped by some reason */
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 60) return 1;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 61) ++de;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 62) *ofs += sizeof(struct erofs_dirent);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 63) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 64) *ofs = maxsize;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 65) return 0;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 66) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 67)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 68) static int erofs_readdir(struct file *f, struct dir_context *ctx)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 69) {
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 70) struct inode *dir = file_inode(f);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 71) struct address_space *mapping = dir->i_mapping;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 72) const size_t dirsize = i_size_read(dir);
7dd68b147d60e drivers/staging/erofs/dir.c (Thomas Weißschuh 2018-09-10 21:41:14 +0200 73) unsigned int i = ctx->pos / EROFS_BLKSIZ;
7dd68b147d60e drivers/staging/erofs/dir.c (Thomas Weißschuh 2018-09-10 21:41:14 +0200 74) unsigned int ofs = ctx->pos % EROFS_BLKSIZ;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 75) int err = 0;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 76) bool initial = true;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 77)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 78) while (ctx->pos < dirsize) {
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 79) struct page *dentry_page;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 80) struct erofs_dirent *de;
7dd68b147d60e drivers/staging/erofs/dir.c (Thomas Weißschuh 2018-09-10 21:41:14 +0200 81) unsigned int nameoff, maxsize;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 82)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 83) dentry_page = read_mapping_page(mapping, i, NULL);
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 84) if (dentry_page == ERR_PTR(-ENOMEM)) {
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 85) err = -ENOMEM;
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 86) break;
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 87) } else if (IS_ERR(dentry_page)) {
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 88) erofs_err(dir->i_sb,
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 89) "fail to readdir of logical block %u of nid %llu",
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 90) i, EROFS_I(dir)->nid);
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 91) err = -EFSCORRUPTED;
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 92) break;
acb383f1dcb4f drivers/staging/erofs/dir.c (Gao Xiang 2019-08-18 20:54:57 +0800 93) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 94)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 95) de = (struct erofs_dirent *)kmap(dentry_page);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 96)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 97) nameoff = le16_to_cpu(de->nameoff);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 98)
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 99) if (nameoff < sizeof(struct erofs_dirent) ||
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 100) nameoff >= PAGE_SIZE) {
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 101) erofs_err(dir->i_sb,
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 102) "invalid de[0].nameoff %u @ nid %llu",
4f761fa253b49 fs/erofs/dir.c (Gao Xiang 2019-09-04 10:09:09 +0800 103) nameoff, EROFS_I(dir)->nid);
a6b9b1d5eae61 drivers/staging/erofs/dir.c (Gao Xiang 2019-08-14 18:37:03 +0800 104) err = -EFSCORRUPTED;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 105) goto skip_this;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 106) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 107)
7dd68b147d60e drivers/staging/erofs/dir.c (Thomas Weißschuh 2018-09-10 21:41:14 +0200 108) maxsize = min_t(unsigned int,
7dd68b147d60e drivers/staging/erofs/dir.c (Thomas Weißschuh 2018-09-10 21:41:14 +0200 109) dirsize - ctx->pos + ofs, PAGE_SIZE);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 110)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 111) /* search dirents at the arbitrary position */
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 112) if (initial) {
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 113) initial = false;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 114)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 115) ofs = roundup(ofs, sizeof(struct erofs_dirent));
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 116) if (ofs >= nameoff)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 117) goto skip_this;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 118) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 119)
a6b9b1d5eae61 drivers/staging/erofs/dir.c (Gao Xiang 2019-08-14 18:37:03 +0800 120) err = erofs_fill_dentries(dir, ctx, de, &ofs,
a6b9b1d5eae61 drivers/staging/erofs/dir.c (Gao Xiang 2019-08-14 18:37:03 +0800 121) nameoff, maxsize);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 122) skip_this:
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 123) kunmap(dentry_page);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 124)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 125) put_page(dentry_page);
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 126)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 127) ctx->pos = blknr_to_addr(i) + ofs;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 128)
8d8a09b093d70 fs/erofs/dir.c (Gao Xiang 2019-08-30 00:38:27 +0800 129) if (err)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 130) break;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 131) ++i;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 132) ofs = 0;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 133) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 134) return err < 0 ? err : 0;
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 135) }
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 136)
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 137) const struct file_operations erofs_dir_fops = {
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 138) .llseek = generic_file_llseek,
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 139) .read = generic_read_dir,
bee1568293d72 drivers/staging/erofs/dir.c (Gao Xiang 2019-02-21 10:34:11 +0800 140) .iterate_shared = erofs_readdir,
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 141) };
3aa8ec716e52c drivers/staging/erofs/dir.c (Gao Xiang 2018-07-26 20:21:49 +0800 142)
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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