eventfs: Use GFP_NOFS for allocation when eventfs_mutex is held
If memory reclaim happens, it can reclaim file system pages. The file system pages from eventfs may take the eventfs_mutex on reclaim. This means that allocation while holding the eventfs_mutex must not call into filesystem reclaim. A lockdep splat uncovered this. Link: https://lkml.kernel.org/r/20231121231112.373501894@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Fixes: 28e12c09f5aa0 ("eventfs: Save ownership and mode") Fixes: 5790b1fb3d672 ("eventfs: Remove eventfs_file and just use eventfs_inode") Reported-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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@ -95,7 +95,7 @@ static int eventfs_set_attr(struct mnt_idmap *idmap, struct dentry *dentry,
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if (!(dentry->d_inode->i_mode & S_IFDIR)) {
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if (!ei->entry_attrs) {
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ei->entry_attrs = kzalloc(sizeof(*ei->entry_attrs) * ei->nr_entries,
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GFP_KERNEL);
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GFP_NOFS);
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if (!ei->entry_attrs) {
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ret = -ENOMEM;
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goto out;
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@ -627,7 +627,7 @@ static int add_dentries(struct dentry ***dentries, struct dentry *d, int cnt)
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{
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struct dentry **tmp;
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tmp = krealloc(*dentries, sizeof(d) * (cnt + 2), GFP_KERNEL);
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tmp = krealloc(*dentries, sizeof(d) * (cnt + 2), GFP_NOFS);
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if (!tmp)
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return -1;
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tmp[cnt] = d;
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