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-rw-r--r--Documentation/filesystems/erofs.rst2
-rw-r--r--fs/erofs/Kconfig7
-rw-r--r--fs/erofs/compress.h6
-rw-r--r--fs/erofs/data.c2
-rw-r--r--fs/erofs/decompressor.c63
-rw-r--r--fs/erofs/decompressor_deflate.c6
-rw-r--r--fs/erofs/decompressor_lzma.c7
-rw-r--r--fs/erofs/internal.h42
-rw-r--r--fs/erofs/super.c81
-rw-r--r--fs/erofs/utils.c8
-rw-r--r--fs/erofs/zdata.c1
11 files changed, 89 insertions, 136 deletions
diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index f200d7874495..57c6ae23b3fc 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -199,7 +199,7 @@ may not. All metadatas can be now observed in two different spaces (views):
| |
|__________________| 64 bytes
- Xattrs, extents, data inline are followed by the corresponding inode with
+ Xattrs, extents, data inline are placed after the corresponding inode with
proper alignment, and they could be optional for different data mappings.
_currently_ total 5 data layouts are supported:
diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index f6dc961e6c2b..e540648dedc2 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -91,13 +91,10 @@ config EROFS_FS_ZIP_LZMA
select XZ_DEC_MICROLZMA
help
Saying Y here includes support for reading EROFS file systems
- containing LZMA compressed data, specifically called microLZMA. it
- gives better compression ratios than the LZ4 algorithm, at the
+ containing LZMA compressed data, specifically called microLZMA. It
+ gives better compression ratios than the default LZ4 format, at the
expense of more CPU overhead.
- LZMA support is an experimental feature for now and so most file
- systems will be readable without selecting this option.
-
If unsure, say N.
config EROFS_FS_ZIP_DEFLATE
diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
index 349c3316ae6b..279933e007d2 100644
--- a/fs/erofs/compress.h
+++ b/fs/erofs/compress.h
@@ -21,6 +21,8 @@ struct z_erofs_decompress_req {
};
struct z_erofs_decompressor {
+ int (*config)(struct super_block *sb, struct erofs_super_block *dsb,
+ void *data, int size);
int (*decompress)(struct z_erofs_decompress_req *rq,
struct page **pagepool);
char *name;
@@ -92,6 +94,10 @@ int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
extern const struct z_erofs_decompressor erofs_decompressors[];
/* prototypes for specific algorithms */
+int z_erofs_load_lzma_config(struct super_block *sb,
+ struct erofs_super_block *dsb, void *data, int size);
+int z_erofs_load_deflate_config(struct super_block *sb,
+ struct erofs_super_block *dsb, void *data, int size);
int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
struct page **pagepool);
int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index f6a0a1748521..029c761670bf 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -5,9 +5,7 @@
* Copyright (C) 2021, Alibaba Cloud
*/
#include "internal.h"
-#include <linux/prefetch.h>
#include <linux/sched/mm.h>
-#include <linux/dax.h>
#include <trace/events/erofs.h>
void erofs_unmap_metabuf(struct erofs_buf *buf)
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 332ec5f74002..021be5feb1bc 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -4,7 +4,6 @@
* https://www.huawei.com/
*/
#include "compress.h"
-#include <linux/module.h>
#include <linux/lz4.h>
#ifndef LZ4_DISTANCE_MAX /* history window size */
@@ -24,11 +23,11 @@ struct z_erofs_lz4_decompress_ctx {
unsigned int oend;
};
-int z_erofs_load_lz4_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lz4_cfgs *lz4, int size)
+static int z_erofs_load_lz4_config(struct super_block *sb,
+ struct erofs_super_block *dsb, void *data, int size)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct z_erofs_lz4_cfgs *lz4 = data;
u16 distance;
if (lz4) {
@@ -370,19 +369,75 @@ const struct z_erofs_decompressor erofs_decompressors[] = {
.name = "interlaced"
},
[Z_EROFS_COMPRESSION_LZ4] = {
+ .config = z_erofs_load_lz4_config,
.decompress = z_erofs_lz4_decompress,
.name = "lz4"
},
#ifdef CONFIG_EROFS_FS_ZIP_LZMA
[Z_EROFS_COMPRESSION_LZMA] = {
+ .config = z_erofs_load_lzma_config,
.decompress = z_erofs_lzma_decompress,
.name = "lzma"
},
#endif
#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
[Z_EROFS_COMPRESSION_DEFLATE] = {
+ .config = z_erofs_load_deflate_config,
.decompress = z_erofs_deflate_decompress,
.name = "deflate"
},
#endif
};
+
+int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb)
+{
+ struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
+ unsigned int algs, alg;
+ erofs_off_t offset;
+ int size, ret = 0;
+
+ if (!erofs_sb_has_compr_cfgs(sbi)) {
+ sbi->available_compr_algs = Z_EROFS_COMPRESSION_LZ4;
+ return z_erofs_load_lz4_config(sb, dsb, NULL, 0);
+ }
+
+ sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
+ if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
+ erofs_err(sb, "unidentified algorithms %x, please upgrade kernel",
+ sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
+ return -EOPNOTSUPP;
+ }
+
+ erofs_init_metabuf(&buf, sb);
+ offset = EROFS_SUPER_OFFSET + sbi->sb_size;
+ alg = 0;
+ for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
+ void *data;
+
+ if (!(algs & 1))
+ continue;
+
+ data = erofs_read_metadata(sb, &buf, &offset, &size);
+ if (IS_ERR(data)) {
+ ret = PTR_ERR(data);
+ break;
+ }
+
+ if (alg >= ARRAY_SIZE(erofs_decompressors) ||
+ !erofs_decompressors[alg].config) {
+ erofs_err(sb, "algorithm %d isn't enabled on this kernel",
+ alg);
+ ret = -EOPNOTSUPP;
+ } else {
+ ret = erofs_decompressors[alg].config(sb,
+ dsb, data, size);
+ }
+
+ kfree(data);
+ if (ret)
+ break;
+ }
+ erofs_put_metabuf(&buf);
+ return ret;
+}
diff --git a/fs/erofs/decompressor_deflate.c b/fs/erofs/decompressor_deflate.c
index 19e5bdeb30b6..daf3c1bdeab8 100644
--- a/fs/erofs/decompressor_deflate.c
+++ b/fs/erofs/decompressor_deflate.c
@@ -1,5 +1,4 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-#include <linux/module.h>
#include <linux/zlib.h>
#include "compress.h"
@@ -77,9 +76,10 @@ out_failed:
}
int z_erofs_load_deflate_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_deflate_cfgs *dfl, int size)
+ struct erofs_super_block *dsb, void *data, int size)
{
+ struct z_erofs_deflate_cfgs *dfl = data;
+
if (!dfl || size < sizeof(struct z_erofs_deflate_cfgs)) {
erofs_err(sb, "invalid deflate cfgs, size=%u", size);
return -EINVAL;
diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c
index dee10d22ada9..2dd14f99c1dc 100644
--- a/fs/erofs/decompressor_lzma.c
+++ b/fs/erofs/decompressor_lzma.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/xz.h>
-#include <linux/module.h>
#include "compress.h"
struct z_erofs_lzma {
@@ -72,10 +71,10 @@ int __init z_erofs_lzma_init(void)
}
int z_erofs_load_lzma_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lzma_cfgs *lzma, int size)
+ struct erofs_super_block *dsb, void *data, int size)
{
static DEFINE_MUTEX(lzma_resize_mutex);
+ struct z_erofs_lzma_cfgs *lzma = data;
unsigned int dict_size, i;
struct z_erofs_lzma *strm, *head = NULL;
int err;
@@ -96,8 +95,6 @@ int z_erofs_load_lzma_config(struct super_block *sb,
return -EINVAL;
}
- erofs_info(sb, "EXPERIMENTAL MicroLZMA in use. Use at your own risk!");
-
/* in case 2 z_erofs_load_lzma_config() race to avoid deadlock */
mutex_lock(&lzma_resize_mutex);
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index cf04e21bfda2..b0409badb017 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -8,8 +8,10 @@
#define __EROFS_INTERNAL_H
#include <linux/fs.h>
+#include <linux/dax.h>
#include <linux/dcache.h>
#include <linux/mm.h>
+#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/bio.h>
#include <linux/magic.h>
@@ -228,8 +230,6 @@ struct erofs_buf {
};
#define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
-#define ROOT_NID(sb) ((sb)->root_nid)
-
#define erofs_blknr(sb, addr) ((addr) >> (sb)->s_blocksize_bits)
#define erofs_blkoff(sb, addr) ((addr) & ((sb)->s_blocksize - 1))
#define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
@@ -469,9 +469,6 @@ int __init z_erofs_init_zip_subsystem(void);
void z_erofs_exit_zip_subsystem(void);
int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
struct erofs_workgroup *egrp);
-int z_erofs_load_lz4_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lz4_cfgs *lz4, int len);
int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
int flags);
void *erofs_get_pcpubuf(unsigned int requiredpages);
@@ -480,6 +477,7 @@ int erofs_pcpubuf_growsize(unsigned int nrpages);
void __init erofs_pcpubuf_init(void);
void erofs_pcpubuf_exit(void);
int erofs_init_managed_cache(struct super_block *sb);
+int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
#else
static inline void erofs_shrinker_register(struct super_block *sb) {}
static inline void erofs_shrinker_unregister(struct super_block *sb) {}
@@ -487,16 +485,6 @@ static inline int erofs_init_shrinker(void) { return 0; }
static inline void erofs_exit_shrinker(void) {}
static inline int z_erofs_init_zip_subsystem(void) { return 0; }
static inline void z_erofs_exit_zip_subsystem(void) {}
-static inline int z_erofs_load_lz4_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lz4_cfgs *lz4, int len)
-{
- if (lz4 || dsb->u1.lz4_max_distance) {
- erofs_err(sb, "lz4 algorithm isn't enabled");
- return -EINVAL;
- }
- return 0;
-}
static inline void erofs_pcpubuf_init(void) {}
static inline void erofs_pcpubuf_exit(void) {}
static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
@@ -505,41 +493,17 @@ static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
#ifdef CONFIG_EROFS_FS_ZIP_LZMA
int __init z_erofs_lzma_init(void);
void z_erofs_lzma_exit(void);
-int z_erofs_load_lzma_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lzma_cfgs *lzma, int size);
#else
static inline int z_erofs_lzma_init(void) { return 0; }
static inline int z_erofs_lzma_exit(void) { return 0; }
-static inline int z_erofs_load_lzma_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_lzma_cfgs *lzma, int size) {
- if (lzma) {
- erofs_err(sb, "lzma algorithm isn't enabled");
- return -EINVAL;
- }
- return 0;
-}
#endif /* !CONFIG_EROFS_FS_ZIP_LZMA */
#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
int __init z_erofs_deflate_init(void);
void z_erofs_deflate_exit(void);
-int z_erofs_load_deflate_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_deflate_cfgs *dfl, int size);
#else
static inline int z_erofs_deflate_init(void) { return 0; }
static inline int z_erofs_deflate_exit(void) { return 0; }
-static inline int z_erofs_load_deflate_config(struct super_block *sb,
- struct erofs_super_block *dsb,
- struct z_erofs_deflate_cfgs *dfl, int size) {
- if (dfl) {
- erofs_err(sb, "deflate algorithm isn't enabled");
- return -EINVAL;
- }
- return 0;
-}
#endif /* !CONFIG_EROFS_FS_ZIP_DEFLATE */
#ifdef CONFIG_EROFS_FS_ONDEMAND
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 6fd04781fec5..976dc39a88f7 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -4,14 +4,11 @@
* https://www.huawei.com/
* Copyright (C) 2021, Alibaba Cloud
*/
-#include <linux/module.h>
#include <linux/statfs.h>
-#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/crc32c.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
-#include <linux/dax.h>
#include <linux/exportfs.h>
#include "xattr.h"
@@ -156,68 +153,15 @@ void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
return buffer;
}
-#ifdef CONFIG_EROFS_FS_ZIP
-static int erofs_load_compr_cfgs(struct super_block *sb,
- struct erofs_super_block *dsb)
+#ifndef CONFIG_EROFS_FS_ZIP
+static int z_erofs_parse_cfgs(struct super_block *sb,
+ struct erofs_super_block *dsb)
{
- struct erofs_sb_info *sbi = EROFS_SB(sb);
- struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
- unsigned int algs, alg;
- erofs_off_t offset;
- int size, ret = 0;
-
- sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
- if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
- erofs_err(sb, "try to load compressed fs with unsupported algorithms %x",
- sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
- return -EINVAL;
- }
-
- erofs_init_metabuf(&buf, sb);
- offset = EROFS_SUPER_OFFSET + sbi->sb_size;
- alg = 0;
- for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
- void *data;
-
- if (!(algs & 1))
- continue;
-
- data = erofs_read_metadata(sb, &buf, &offset, &size);
- if (IS_ERR(data)) {
- ret = PTR_ERR(data);
- break;
- }
+ if (!dsb->u1.available_compr_algs)
+ return 0;
- switch (alg) {
- case Z_EROFS_COMPRESSION_LZ4:
- ret = z_erofs_load_lz4_config(sb, dsb, data, size);
- break;
- case Z_EROFS_COMPRESSION_LZMA:
- ret = z_erofs_load_lzma_config(sb, dsb, data, size);
- break;
- case Z_EROFS_COMPRESSION_DEFLATE:
- ret = z_erofs_load_deflate_config(sb, dsb, data, size);
- break;
- default:
- DBG_BUGON(1);
- ret = -EFAULT;
- }
- kfree(data);
- if (ret)
- break;
- }
- erofs_put_metabuf(&buf);
- return ret;
-}
-#else
-static int erofs_load_compr_cfgs(struct super_block *sb,
- struct erofs_super_block *dsb)
-{
- if (dsb->u1.available_compr_algs) {
- erofs_err(sb, "try to load compressed fs when compression is disabled");
- return -EINVAL;
- }
- return 0;
+ erofs_err(sb, "compression disabled, unable to mount compressed EROFS");
+ return -EOPNOTSUPP;
}
#endif
@@ -406,10 +350,7 @@ static int erofs_read_superblock(struct super_block *sb)
}
/* parse on-disk compression configurations */
- if (erofs_sb_has_compr_cfgs(sbi))
- ret = erofs_load_compr_cfgs(sb, dsb);
- else
- ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
+ ret = z_erofs_parse_cfgs(sb, dsb);
if (ret < 0)
goto out;
@@ -724,13 +665,13 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
xa_init(&sbi->managed_pslots);
#endif
- inode = erofs_iget(sb, ROOT_NID(sbi));
+ inode = erofs_iget(sb, sbi->root_nid);
if (IS_ERR(inode))
return PTR_ERR(inode);
if (!S_ISDIR(inode->i_mode)) {
erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
- ROOT_NID(sbi), inode->i_mode);
+ sbi->root_nid, inode->i_mode);
iput(inode);
return -EINVAL;
}
@@ -760,7 +701,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
- erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
+ erofs_info(sb, "mounted with root inode @ nid %llu.", sbi->root_nid);
return 0;
}
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index cc6fb9e98899..4256a85719a1 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -77,12 +77,7 @@ struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb,
struct erofs_sb_info *const sbi = EROFS_SB(sb);
struct erofs_workgroup *pre;
- /*
- * Bump up before making this visible to others for the XArray in order
- * to avoid potential UAF without serialized by xa_lock.
- */
- lockref_get(&grp->lockref);
-
+ DBG_BUGON(grp->lockref.count < 1);
repeat:
xa_lock(&sbi->managed_pslots);
pre = __xa_cmpxchg(&sbi->managed_pslots, grp->index,
@@ -96,7 +91,6 @@ repeat:
cond_resched();
goto repeat;
}
- lockref_put_return(&grp->lockref);
grp = pre;
}
xa_unlock(&sbi->managed_pslots);
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 036f610e044b..a7e6847f6f8f 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -796,6 +796,7 @@ static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe)
return PTR_ERR(pcl);
spin_lock_init(&pcl->obj.lockref.lock);
+ pcl->obj.lockref.count = 1; /* one ref for this request */
pcl->algorithmformat = map->m_algorithmformat;
pcl->length = 0;
pcl->partial = true;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 18:37:55 +0100