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Luís Henriques |
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From: Takashi Iwai <tiwai@suse.de>
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Luís Henriques |
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Date: Wed, 20 Jan 2021 16:11:12 +0000
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Luís Henriques |
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Subject: cachefiles: Drop superfluous readpages aops NULL check
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Git-commit: db58465f1121086b524be80be39d1fedbe5387f3
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Patch-mainline: v5.11-rc5
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References: bsc#1210430
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Luís Henriques |
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After the recent actions to convert readpages aops to readahead, the
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Luís Henriques |
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NULL checks of readpages aops in cachefiles_read_or_alloc_page() may
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hit falsely. More badly, it's an ASSERT() call, and this panics.
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Luís Henriques |
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Luís Henriques |
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Drop the superfluous NULL checks for fixing this regression.
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Luís Henriques |
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Luís Henriques |
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[dh: Note that cachefiles never actually used readpages, so this check was
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never actually necessary]
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Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=208883
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Buglink: https://bugzilla.opensuse.org/show_bug.cgi?id=1175245
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Fixes: 9ae326a69004 ("CacheFiles: A cache that backs onto a mounted filesystem")
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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Signed-off-by: David Howells <dhowells@redhat.com>
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Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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[adjusted context as we don't have 10d83e11a582
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("cachefiles: drop direct usage of ->bmap method.")]
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Acked-by: Luís Henriques <lhenriques@suse.de>
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---
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fs/cachefiles/rdwr.c | 2 --
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1 file changed, 2 deletions(-)
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--- a/fs/cachefiles/rdwr.c
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+++ b/fs/cachefiles/rdwr.c
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@@ -418,7 +418,6 @@ int cachefiles_read_or_alloc_page(struct
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inode = d_backing_inode(object->backer);
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ASSERT(S_ISREG(inode->i_mode));
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ASSERT(inode->i_mapping->a_ops->bmap);
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- ASSERT(inode->i_mapping->a_ops->readpages);
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/* calculate the shift required to use bmap */
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shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits;
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@@ -717,7 +716,6 @@ int cachefiles_read_or_alloc_pages(struc
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inode = d_backing_inode(object->backer);
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ASSERT(S_ISREG(inode->i_mode));
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ASSERT(inode->i_mapping->a_ops->bmap);
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- ASSERT(inode->i_mapping->a_ops->readpages);
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/* calculate the shift required to use bmap */
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shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits;
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