From: Gao Xiang <gaoxiang25@huawei.com> To: Alexander Viro <viro@zeniv.linux.org.uk>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Stephen Rothwell <sfr@canb.auug.org.au>, Theodore Ts'o <tytso@mit.edu>, "David Sterba" <dsterba@suse.cz>, Amir Goldstein <amir73il@gmail.com>, "Christoph Hellwig" <hch@infradead.org>, "Darrick J . Wong" <darrick.wong@oracle.com>, Dave Chinner <david@fromorbit.com>, Jaegeuk Kim <jaegeuk@kernel.org>, "Jan Kara" <jack@suse.cz>, Linus Torvalds <torvalds@linux-foundation.org> Cc: <linux-fsdevel@vger.kernel.org>, <devel@driverdev.osuosl.org>, LKML <linux-kernel@vger.kernel.org>, <linux-erofs@lists.ozlabs.org>, Chao Yu <yuchao0@huawei.com>, Miao Xie <miaoxie@huawei.com>, Li Guifu <bluce.liguifu@huawei.com>, Fang Wei <fangwei1@huawei.com>, Gao Xiang <gaoxiang25@huawei.com> Subject: [PATCH v5 07/24] erofs: add directory operations Date: Tue, 30 Jul 2019 15:13:56 +0800 [thread overview] Message-ID: <20190730071413.11871-8-gaoxiang25@huawei.com> (raw) In-Reply-To: <20190730071413.11871-1-gaoxiang25@huawei.com> This adds functions for directory, mainly readdir. Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> --- fs/erofs/dir.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 fs/erofs/dir.c diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c new file mode 100644 index 000000000000..7cf7da8574c4 --- /dev/null +++ b/fs/erofs/dir.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/erofs/dir.c + * + * Copyright (C) 2017-2018 HUAWEI, Inc. + * http://www.huawei.com/ + * Created by Gao Xiang <gaoxiang25@huawei.com> + */ +#include "internal.h" + +static const unsigned char erofs_filetype_table[EROFS_FT_MAX] = { + [EROFS_FT_UNKNOWN] = DT_UNKNOWN, + [EROFS_FT_REG_FILE] = DT_REG, + [EROFS_FT_DIR] = DT_DIR, + [EROFS_FT_CHRDEV] = DT_CHR, + [EROFS_FT_BLKDEV] = DT_BLK, + [EROFS_FT_FIFO] = DT_FIFO, + [EROFS_FT_SOCK] = DT_SOCK, + [EROFS_FT_SYMLINK] = DT_LNK, +}; + +static void debug_one_dentry(unsigned char d_type, const char *de_name, + unsigned int de_namelen) +{ +#ifdef CONFIG_EROFS_FS_DEBUG + /* since the on-disk name could not have the trailing '\0' */ + unsigned char dbg_namebuf[EROFS_NAME_LEN + 1]; + + memcpy(dbg_namebuf, de_name, de_namelen); + dbg_namebuf[de_namelen] = '\0'; + + debugln("found dirent %s de_len %u d_type %d", dbg_namebuf, + de_namelen, d_type); +#endif +} + +static int erofs_fill_dentries(struct dir_context *ctx, + void *dentry_blk, unsigned int *ofs, + unsigned int nameoff, unsigned int maxsize) +{ + struct erofs_dirent *de = dentry_blk + *ofs; + const struct erofs_dirent *end = dentry_blk + nameoff; + + while (de < end) { + const char *de_name; + unsigned int de_namelen; + unsigned char d_type; + + if (de->file_type < EROFS_FT_MAX) + d_type = erofs_filetype_table[de->file_type]; + else + d_type = DT_UNKNOWN; + + nameoff = le16_to_cpu(de->nameoff); + de_name = (char *)dentry_blk + nameoff; + + /* the last dirent in the block? */ + if (de + 1 >= end) + de_namelen = strnlen(de_name, maxsize - nameoff); + else + de_namelen = le16_to_cpu(de[1].nameoff) - nameoff; + + /* a corrupted entry is found */ + if (unlikely(nameoff + de_namelen > maxsize || + de_namelen > EROFS_NAME_LEN)) { + DBG_BUGON(1); + return -EIO; + } + + debug_one_dentry(d_type, de_name, de_namelen); + if (!dir_emit(ctx, de_name, de_namelen, + le64_to_cpu(de->nid), d_type)) + /* stopped by some reason */ + return 1; + ++de; + *ofs += sizeof(struct erofs_dirent); + } + *ofs = maxsize; + return 0; +} + +static int erofs_readdir(struct file *f, struct dir_context *ctx) +{ + struct inode *dir = file_inode(f); + struct address_space *mapping = dir->i_mapping; + const size_t dirsize = i_size_read(dir); + unsigned int i = ctx->pos / EROFS_BLKSIZ; + unsigned int ofs = ctx->pos % EROFS_BLKSIZ; + int err = 0; + bool initial = true; + + while (ctx->pos < dirsize) { + struct page *dentry_page; + struct erofs_dirent *de; + unsigned int nameoff, maxsize; + + dentry_page = read_mapping_page(mapping, i, NULL); + if (IS_ERR(dentry_page)) + continue; + + de = (struct erofs_dirent *)kmap(dentry_page); + + nameoff = le16_to_cpu(de->nameoff); + + if (unlikely(nameoff < sizeof(struct erofs_dirent) || + nameoff >= PAGE_SIZE)) { + errln("%s, invalid de[0].nameoff %u", + __func__, nameoff); + + err = -EIO; + goto skip_this; + } + + maxsize = min_t(unsigned int, + dirsize - ctx->pos + ofs, PAGE_SIZE); + + /* search dirents at the arbitrary position */ + if (unlikely(initial)) { + initial = false; + + ofs = roundup(ofs, sizeof(struct erofs_dirent)); + if (unlikely(ofs >= nameoff)) + goto skip_this; + } + + err = erofs_fill_dentries(ctx, de, &ofs, nameoff, maxsize); +skip_this: + kunmap(dentry_page); + + put_page(dentry_page); + + ctx->pos = blknr_to_addr(i) + ofs; + + if (unlikely(err)) + break; + ++i; + ofs = 0; + } + return err < 0 ? err : 0; +} + +const struct file_operations erofs_dir_fops = { + .llseek = generic_file_llseek, + .read = generic_read_dir, + .iterate_shared = erofs_readdir, +}; + -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: gaoxiang25@huawei.com (Gao Xiang) Subject: [PATCH v5 07/24] erofs: add directory operations Date: Tue, 30 Jul 2019 15:13:56 +0800 [thread overview] Message-ID: <20190730071413.11871-8-gaoxiang25@huawei.com> (raw) In-Reply-To: <20190730071413.11871-1-gaoxiang25@huawei.com> This adds functions for directory, mainly readdir. Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com> --- fs/erofs/dir.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 fs/erofs/dir.c diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c new file mode 100644 index 000000000000..7cf7da8574c4 --- /dev/null +++ b/fs/erofs/dir.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/erofs/dir.c + * + * Copyright (C) 2017-2018 HUAWEI, Inc. + * http://www.huawei.com/ + * Created by Gao Xiang <gaoxiang25 at huawei.com> + */ +#include "internal.h" + +static const unsigned char erofs_filetype_table[EROFS_FT_MAX] = { + [EROFS_FT_UNKNOWN] = DT_UNKNOWN, + [EROFS_FT_REG_FILE] = DT_REG, + [EROFS_FT_DIR] = DT_DIR, + [EROFS_FT_CHRDEV] = DT_CHR, + [EROFS_FT_BLKDEV] = DT_BLK, + [EROFS_FT_FIFO] = DT_FIFO, + [EROFS_FT_SOCK] = DT_SOCK, + [EROFS_FT_SYMLINK] = DT_LNK, +}; + +static void debug_one_dentry(unsigned char d_type, const char *de_name, + unsigned int de_namelen) +{ +#ifdef CONFIG_EROFS_FS_DEBUG + /* since the on-disk name could not have the trailing '\0' */ + unsigned char dbg_namebuf[EROFS_NAME_LEN + 1]; + + memcpy(dbg_namebuf, de_name, de_namelen); + dbg_namebuf[de_namelen] = '\0'; + + debugln("found dirent %s de_len %u d_type %d", dbg_namebuf, + de_namelen, d_type); +#endif +} + +static int erofs_fill_dentries(struct dir_context *ctx, + void *dentry_blk, unsigned int *ofs, + unsigned int nameoff, unsigned int maxsize) +{ + struct erofs_dirent *de = dentry_blk + *ofs; + const struct erofs_dirent *end = dentry_blk + nameoff; + + while (de < end) { + const char *de_name; + unsigned int de_namelen; + unsigned char d_type; + + if (de->file_type < EROFS_FT_MAX) + d_type = erofs_filetype_table[de->file_type]; + else + d_type = DT_UNKNOWN; + + nameoff = le16_to_cpu(de->nameoff); + de_name = (char *)dentry_blk + nameoff; + + /* the last dirent in the block? */ + if (de + 1 >= end) + de_namelen = strnlen(de_name, maxsize - nameoff); + else + de_namelen = le16_to_cpu(de[1].nameoff) - nameoff; + + /* a corrupted entry is found */ + if (unlikely(nameoff + de_namelen > maxsize || + de_namelen > EROFS_NAME_LEN)) { + DBG_BUGON(1); + return -EIO; + } + + debug_one_dentry(d_type, de_name, de_namelen); + if (!dir_emit(ctx, de_name, de_namelen, + le64_to_cpu(de->nid), d_type)) + /* stopped by some reason */ + return 1; + ++de; + *ofs += sizeof(struct erofs_dirent); + } + *ofs = maxsize; + return 0; +} + +static int erofs_readdir(struct file *f, struct dir_context *ctx) +{ + struct inode *dir = file_inode(f); + struct address_space *mapping = dir->i_mapping; + const size_t dirsize = i_size_read(dir); + unsigned int i = ctx->pos / EROFS_BLKSIZ; + unsigned int ofs = ctx->pos % EROFS_BLKSIZ; + int err = 0; + bool initial = true; + + while (ctx->pos < dirsize) { + struct page *dentry_page; + struct erofs_dirent *de; + unsigned int nameoff, maxsize; + + dentry_page = read_mapping_page(mapping, i, NULL); + if (IS_ERR(dentry_page)) + continue; + + de = (struct erofs_dirent *)kmap(dentry_page); + + nameoff = le16_to_cpu(de->nameoff); + + if (unlikely(nameoff < sizeof(struct erofs_dirent) || + nameoff >= PAGE_SIZE)) { + errln("%s, invalid de[0].nameoff %u", + __func__, nameoff); + + err = -EIO; + goto skip_this; + } + + maxsize = min_t(unsigned int, + dirsize - ctx->pos + ofs, PAGE_SIZE); + + /* search dirents at the arbitrary position */ + if (unlikely(initial)) { + initial = false; + + ofs = roundup(ofs, sizeof(struct erofs_dirent)); + if (unlikely(ofs >= nameoff)) + goto skip_this; + } + + err = erofs_fill_dentries(ctx, de, &ofs, nameoff, maxsize); +skip_this: + kunmap(dentry_page); + + put_page(dentry_page); + + ctx->pos = blknr_to_addr(i) + ofs; + + if (unlikely(err)) + break; + ++i; + ofs = 0; + } + return err < 0 ? err : 0; +} + +const struct file_operations erofs_dir_fops = { + .llseek = generic_file_llseek, + .read = generic_read_dir, + .iterate_shared = erofs_readdir, +}; + -- 2.17.1
next prev parent reply other threads:[~2019-07-30 7:16 UTC|newest] Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-30 7:13 [PATCH v5 00/24] erofs: promote erofs from staging Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 01/24] erofs: add on-disk layout Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 02/24] erofs: add erofs in-memory stuffs Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 03/24] erofs: add super block operations Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 04/24] erofs: add raw address_space operations Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 05/24] erofs: add inode operations Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 06/24] erofs: support special inode Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` Gao Xiang [this message] 2019-07-30 7:13 ` [PATCH v5 07/24] erofs: add directory operations Gao Xiang 2019-07-30 7:13 ` [PATCH v5 08/24] erofs: add namei functions Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 09/24] erofs: support tracepoint Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:13 ` [PATCH v5 10/24] erofs: update Kconfig and Makefile Gao Xiang 2019-07-30 7:13 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 11/24] erofs: introduce xattr & posixacl support Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 12/24] erofs: introduce tagged pointer Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-31 13:01 ` Jan Kara 2019-07-31 13:01 ` Jan Kara 2019-07-31 13:20 ` Gao Xiang 2019-07-31 13:20 ` Gao Xiang 2019-07-31 13:30 ` Gao Xiang 2019-07-31 13:30 ` Gao Xiang 2019-07-31 13:52 ` Gao Xiang 2019-07-31 13:52 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 13/24] erofs: add compression indexes support Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 14/24] erofs: introduce superblock registration Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 15/24] erofs: introduce erofs shrinker Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 16/24] erofs: introduce workstation for decompression Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 17/24] erofs: introduce per-CPU buffers implementation Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 18/24] erofs: introduce pagevec for decompression subsystem Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 19/24] erofs: add erofs_allocpage() Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 20/24] erofs: introduce generic decompression backend Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 21/24] erofs: introduce LZ4 decompression inplace Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 22/24] erofs: introduce the decompression frontend Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 23/24] erofs: introduce cached decompression Gao Xiang 2019-07-30 7:14 ` Gao Xiang 2019-07-30 7:14 ` [PATCH v5 24/24] erofs: add document Gao Xiang 2019-07-30 7:14 ` Gao Xiang
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