File 0f6a3a402f4a66114da9231032bd68cdc4dee7bc of Package openafs

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File 0f6a3a402f4a66114da9231032bd68cdc4dee7bc of Package openafs

commit 0f6a3a402f4a66114da9231032bd68cdc4dee7bc
Author: Cheyenne Wills <cwills@sinenomine.net>
Date:   Wed Jun 12 14:13:59 2024 -0600

Linux-6.10: Use filemap_alloc_folio when avail
    
    The Linux 6.10 commit:
        "mm: remove page_cache_alloc()" (3f2ae4ebd5)
    removed the page_cache_alloc(), with a note that callers would be using
    filemap_alloc_folio instead.
    
    The function filemap_alloc_folio() was introduced in Linux 5.15 commit:
        "mm/filemap: Add filemap_alloc_folio" (bb3c579e25)
    
    Add a configure check for filemap_alloc_folio and update the function
    afs_linux_read_cache() to use a wrapper that calls filemap_alloc_folio()
    if available otherwise calls page_cache_alloc().
    
    Minor whitespace/style cleanup
    
    Note: The function filemap_alloc_folio() was introduced in Linux 5.15,
    so this change affects builds using the Linux kernel 5.15 and later.
    
    Change-Id: Ia17aefc38fe9787e54b315c864da726d610b8bb9
    Reviewed-on: https://gerrit.openafs.org/15764
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Andrew Deason <adeason@sinenomine.net>
    Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>

diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index 511b0838f..18809c89f 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -2320,6 +2320,24 @@ mapping_read_page(struct address_space *mapping, struct page *page)
 #endif
 }
 
+/*
+ * small compat wrapper for filemap_alloc_folio/page_cache_alloc
+ */
+static struct page *
+afs_page_cache_alloc(struct address_space *cachemapping)
+{
+#if defined(HAVE_LINUX_FILEMAP_ALLOC_FOLIO)
+    struct folio *folio;
+    folio = filemap_alloc_folio(mapping_gfp_mask(cachemapping), 0);
+    if (folio == NULL) {
+	return NULL;
+    }
+    return &folio->page;
+#else
+    return page_cache_alloc(cachemapping);
+#endif
+}
+
 /* Populate a page by filling it from the cache file pointed at by cachefp
  * (which contains indicated chunk)
  * If task is NULL, the page copy occurs syncronously, and the routine
@@ -2358,11 +2376,12 @@ afs_linux_read_cache(struct file *cachefp, struct page *page,
     pageindex = (offset - AFS_CHUNKTOBASE(chunk)) >> PAGE_SHIFT;
 
     while (cachepage == NULL) {
-        cachepage = find_get_page(cachemapping, pageindex);
+	cachepage = find_get_page(cachemapping, pageindex);
 	if (!cachepage) {
-	    if (!newpage)
-		newpage = page_cache_alloc(cachemapping);
-	    if (!newpage) {
+	    if (newpage == NULL) {
+		newpage = afs_page_cache_alloc(cachemapping);
+	    }
+	    if (newpage == NULL) {
 		code = -ENOMEM;
 		goto out;
 	    }
diff --git a/src/cf/linux-kernel-func.m4 b/src/cf/linux-kernel-func.m4
index 93f96f5ad..83ea354b0 100644
--- a/src/cf/linux-kernel-func.m4
+++ b/src/cf/linux-kernel-func.m4
@@ -253,6 +253,16 @@ AC_CHECK_LINUX_FUNC([no_strlcpy],
 		     size_t s;
 		     s = strlcpy(buff);]])
 
+dnl Linux 5.15 introduced filemap_alloc_folio() as a replacement for
+dnl page_cache_alloc().  page_cache_alloc() was updated to become just a
+dnl wrapper for filemap_alloc_folio().
+dnl Linux 6.10 removed page_cache_alloc().
+AC_CHECK_LINUX_FUNC([filemap_alloc_folio],
+		    [#include <linux/kernel.h>
+		     #include <linux/pagemap.h>],
+		    [[static struct folio *folio;
+		      folio = filemap_alloc_folio(0, 0);]])
+
 dnl Consequences - things which get set as a result of the
 dnl                above tests
 AS_IF([test "x$ac_cv_linux_func_d_alloc_anon" = "xno"],

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