erofs: mark experimental fscache backend deprecated

Although fscache is still described as "General Filesystem Caching" for
network filesystems and other things such as ISO9660 filesystems, it has
actually become a part of netfslib recently, which was unexpected at the
time when "EROFS over fscache" proposed (2021) since EROFS is entirely a
disk filesystem and the dependency is redundant.

Mark it deprecated and it will be removed after "fanotify pre-content
hooks" lands, which will provide the same functionality for EROFS.

Reviewed-by: Sandeep Dhavale <dhavale@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240830032840.3783206-4-hsiangkao@linux.alibaba.com

diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index 1428d0530e1cb4689f91988fe66c109a382ea9c6..6ea60661fa55bcf2ead09bb71b33c92c21270269 100644 (file)
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -145,7 +145,7 @@ config EROFS_FS_ZIP_ZSTD
          If unsure, say N.
 
 config EROFS_FS_ONDEMAND
-       bool "EROFS fscache-based on-demand read support"
+       bool "EROFS fscache-based on-demand read support (deprecated)"
        depends on EROFS_FS
        select NETFS_SUPPORT
        select FSCACHE
@@ -155,6 +155,9 @@ config EROFS_FS_ONDEMAND
          This permits EROFS to use fscache-backed data blobs with on-demand
          read support.
 
+         It is now deprecated and scheduled to be removed from the kernel
+         after fanotify pre-content hooks are landed.
+
          If unsure, say N.
 
 config EROFS_FS_PCPU_KTHREAD

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 9a7e67eceed4a51abb183fd3d04d192d79430fda..666873f745dab2c8ca926e8b7d4a6afef3a1d50f 100644 (file)
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -353,7 +353,7 @@ static int erofs_read_superblock(struct super_block *sb)
        ret = erofs_scan_devices(sb, dsb);
 
        if (erofs_is_fscache_mode(sb))
-               erofs_info(sb, "EXPERIMENTAL fscache-based on-demand read feature in use. Use at your own risk!");
+               erofs_info(sb, "[deprecated] fscache-based on-demand read feature in use. Use at your own risk!");
 out:
        erofs_put_metabuf(&buf);
        return ret;