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authorHongnan Li <hongnan.li@linux.alibaba.com>2022-07-22 16:27:32 +0800
committerGao Xiang <hsiangkao@linux.alibaba.com>2022-07-31 22:26:29 +0800
commitecce9212d0fd7a2d4a4998f0c4623a66887e14c8 (patch)
treef99c34b9de7778f6fdb7a50c157191816822261c /fs/erofs
parentcc2a171372c68ee64916eb65a962b3aba9ea56ad (diff)
erofs: update ctx->pos for every emitted dirent
erofs_readdir update ctx->pos after filling a batch of dentries and it may cause dir/files duplication for NFS readdirplus which depends on ctx->pos to fill dir correctly. So update ctx->pos for every emitted dirent in erofs_fill_dentries to fix it. Also fix the update of ctx->pos when the initial file position has exceeded nameoff. Fixes: 3e917cc305c6 ("erofs: make filesystem exportable") Signed-off-by: Hongnan Li <hongnan.li@linux.alibaba.com> Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20220722082732.30935-1-jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/dir.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c
index 723f5223a4fa..ecf28f66b97d 100644
--- a/fs/erofs/dir.c
+++ b/fs/erofs/dir.c
@@ -22,10 +22,9 @@ static void debug_one_dentry(unsigned char d_type, const char *de_name,
}
static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
- void *dentry_blk, unsigned int *ofs,
+ void *dentry_blk, struct erofs_dirent *de,
unsigned int nameoff, unsigned int maxsize)
{
- struct erofs_dirent *de = dentry_blk + *ofs;
const struct erofs_dirent *end = dentry_blk + nameoff;
while (de < end) {
@@ -59,9 +58,8 @@ static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
/* stopped by some reason */
return 1;
++de;
- *ofs += sizeof(struct erofs_dirent);
+ ctx->pos += sizeof(struct erofs_dirent);
}
- *ofs = maxsize;
return 0;
}
@@ -95,7 +93,7 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
"invalid de[0].nameoff %u @ nid %llu",
nameoff, EROFS_I(dir)->nid);
err = -EFSCORRUPTED;
- goto skip_this;
+ break;
}
maxsize = min_t(unsigned int,
@@ -106,17 +104,17 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
initial = false;
ofs = roundup(ofs, sizeof(struct erofs_dirent));
+ ctx->pos = blknr_to_addr(i) + ofs;
if (ofs >= nameoff)
goto skip_this;
}
- err = erofs_fill_dentries(dir, ctx, de, &ofs,
+ err = erofs_fill_dentries(dir, ctx, de, (void *)de + ofs,
nameoff, maxsize);
-skip_this:
- ctx->pos = blknr_to_addr(i) + ofs;
-
if (err)
break;
+skip_this:
+ ctx->pos = blknr_to_addr(i) + maxsize;
++i;
ofs = 0;
}