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Message-ID: <20241015064007.3449582-1-hongzhen@linux.alibaba.com>
Date: Tue, 15 Oct 2024 14:40:07 +0800
From: Hongzhen Luo <hongzhen@...ux.alibaba.com>
To: linux-erofs@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org,
Hongzhen Luo <hongzhen@...ux.alibaba.com>
Subject: [PATCH v2] erofs: fix blksize < PAGE_SIZE in fileio mode
In fileio mode, when blcksize is not equal to PAGE_SIZE,
erofs will attempt to set the block size of sb->s_bdev,
which will trigger a panic. This patch fixes this.
Fixes: fb176750266a ("erofs: add file-backed mount support")
Signed-off-by: Hongzhen Luo <hongzhen@...ux.alibaba.com>
---
v2: Add support for blocksize < PAGE_SIZE in file-backed mount mode.
v1: https://lore.kernel.org/linux-erofs/20241015033601.3206952-1-hongzhen@linux.alibaba.com/
---
fs/erofs/super.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 320d586c3896..abe2d85512dd 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -631,9 +631,15 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
errorfc(fc, "unsupported blksize for fscache mode");
return -EINVAL;
}
- if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
- errorfc(fc, "failed to set erofs blksize");
- return -EINVAL;
+
+ if (erofs_is_fileio_mode(sbi)) {
+ sb->s_blocksize = (1 << sbi->blkszbits);
+ sb->s_blocksize_bits = sbi->blkszbits;
+ } else {
+ if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
+ errorfc(fc, "failed to set erofs blksize");
+ return -EINVAL;
+ }
}
}
--
2.43.5
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