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mm/damon/dbgfs: implement deprecation notice file
Implement a read-only file for DAMON debugfs interface deprecation notice, to let users who manually read/write the DAMON debugfs files from their shell command line easily notice the fact. [arnd@arndb.de: fix bogus string length] Link: https://lkml.kernel.org/r/20240202124339.892862-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20240130013549.89538-4-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Alex Shi <alexs@kernel.org> Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <shuah@kernel.org> Cc: Yanteng Si <siyanteng@loongson.cn> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -805,6 +805,17 @@ static void dbgfs_destroy_ctx(struct damon_ctx *ctx)
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damon_destroy_ctx(ctx);
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}
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static ssize_t damon_dbgfs_deprecated_read(struct file *file,
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char __user *buf, size_t count, loff_t *ppos)
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{
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static const char kbuf[512] = "DAMON debugfs interface is deprecated, "
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"so users should move to DAMON_SYSFS. If you cannot, "
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"please report your usecase to damon@lists.linux.dev and "
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"linux-mm@kvack.org.\n";
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return simple_read_from_buffer(buf, count, ppos, kbuf, strlen(kbuf));
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}
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/*
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* Make a context of @name and create a debugfs directory for it.
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*
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@ -1056,6 +1067,10 @@ static int damon_dbgfs_static_file_open(struct inode *inode, struct file *file)
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return nonseekable_open(inode, file);
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}
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static const struct file_operations deprecated_fops = {
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.read = damon_dbgfs_deprecated_read,
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};
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static const struct file_operations mk_contexts_fops = {
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.open = damon_dbgfs_static_file_open,
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.write = dbgfs_mk_context_write,
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@ -1076,9 +1091,9 @@ static int __init __damon_dbgfs_init(void)
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{
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struct dentry *dbgfs_root;
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const char * const file_names[] = {"mk_contexts", "rm_contexts",
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"monitor_on"};
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"monitor_on", "DEPRECATED"};
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const struct file_operations *fops[] = {&mk_contexts_fops,
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&rm_contexts_fops, &monitor_on_fops};
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&rm_contexts_fops, &monitor_on_fops, &deprecated_fops};
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int i;
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dbgfs_root = debugfs_create_dir("damon", NULL);
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