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Message-ID: <20240924192351.74728-2-kernel@pankajraghav.com>
Date: Tue, 24 Sep 2024 21:23:50 +0200
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: willy@...radead.org,
mcgrof@...nel.org,
gost.dev@...sung.com,
akpm@...ux-foundation.org,
kernel@...kajraghav.com,
Christian Brauner <brauner@...nel.org>,
Pankaj Raghav <p.raghav@...sung.com>
Subject: [PATCH 1/2] ramfs: add blocksize mount option
From: Pankaj Raghav <p.raghav@...sung.com>
ramfs has only supported blocksize == PAGE_SIZE as page cache's minimum
allocation unit was a PAGE_SIZE.
As the page cache now has minimum folio order support, ramfs can support
different blocksizes.
This is a preparation patch which adds blocksize mount option but still
supporting only blocksize == PAGE_SIZE.
Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
fs/ramfs/inode.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 8006faaaf0ec7..d846345a0f4b1 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -43,6 +43,7 @@
struct ramfs_mount_opts {
umode_t mode;
+ u32 blocksize;
};
struct ramfs_fs_info {
@@ -221,10 +222,12 @@ static const struct super_operations ramfs_ops = {
enum ramfs_param {
Opt_mode,
+ Opt_blocksize,
};
const struct fs_parameter_spec ramfs_fs_parameters[] = {
fsparam_u32oct("mode", Opt_mode),
+ fsparam_u32("blocksize", Opt_blocksize),
{}
};
@@ -254,6 +257,19 @@ static int ramfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
case Opt_mode:
fsi->mount_opts.mode = result.uint_32 & S_IALLUGO;
break;
+ case Opt_blocksize:
+ if (!fsi->mount_opts.blocksize)
+ return -EINVAL;
+
+ fsi->mount_opts.blocksize = rounddown_pow_of_two(result.uint_32);
+
+ if (fsi->mount_opts.blocksize > PAGE_SIZE)
+ fsi->mount_opts.blocksize = PAGE_SIZE;
+
+ if (fsi->mount_opts.blocksize < PAGE_SIZE)
+ fsi->mount_opts.blocksize = PAGE_SIZE;
+
+ break;
}
return 0;
@@ -265,8 +281,8 @@ static int ramfs_fill_super(struct super_block *sb, struct fs_context *fc)
struct inode *inode;
sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_SIZE;
- sb->s_blocksize_bits = PAGE_SHIFT;
+ sb->s_blocksize = fsi->mount_opts.blocksize;
+ sb->s_blocksize_bits = ilog2(fsi->mount_opts.blocksize);
sb->s_magic = RAMFS_MAGIC;
sb->s_op = &ramfs_ops;
sb->s_time_gran = 1;
@@ -304,6 +320,7 @@ int ramfs_init_fs_context(struct fs_context *fc)
return -ENOMEM;
fsi->mount_opts.mode = RAMFS_DEFAULT_MODE;
+ fsi->mount_opts.blocksize = PAGE_SIZE;
fc->s_fs_info = fsi;
fc->ops = &ramfs_context_ops;
return 0;
--
2.44.1
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