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When the user mmaps() an area that extends beyond the end of file, and proceeds to write data into the folio that straddles that eof, we're required to discard that folio data if the user calls some function that extends the file length. Signed-off-by: Trond Myklebust After this change, we intermittently see EXT4 checksum-related errors during boot. A representative dmesg excerpt is below: [ 1908.365537] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #263414: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1908.375449] EXT4-fs error (device vda2): __ext4_find_entry:1624: inode #263414: comm updatedb: checksumming directory block 0 [ 1908.382985] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #263414: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1908.389289] EXT4-fs error (device vda2): __ext4_find_entry:1624: inode #263414: comm updatedb: checksumming directory block 0 [ 1909.598811] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423753: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1909.604308] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423753: comm updatedb: Directory block failed checksum [ 1909.958470] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423759: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1909.963825] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423759: comm updatedb: Directory block failed checksum [ 1909.985956] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #303617: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1909.991371] EXT4-fs error (device vda2): __ext4_find_entry:1624: inode #303617: comm updatedb: checksumming directory block 0 [ 1910.156415] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423761: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1910.161959] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423761: comm updatedb: Directory block failed checksum [ 1910.171364] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423735: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1910.177292] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423735: comm updatedb: Directory block failed checksum [ 1910.267721] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423744: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1910.281838] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423744: comm updatedb: Directory block failed checksum [ 1910.476906] EXT4-fs warning (device vda2): ext4_dirblock_csum_verify:375: inode #423751: comm updatedb: No space for directory leaf checksum. Please run e2fsck -D. [ 1910.482403] EXT4-fs error (device vda2): htree_dirblock_to_tree:1051: inode #423751: comm updatedb: Directory block failed checksum The issue has so far only been observed in tests that use a nested VM setup. It does not reproduce deterministically, roughly half of the nested VM boots trigger the problem. Would you mind taking a look or pointing us in the right direction? Please let us know if additional information, testing, or instrumentation would be helpful. Thanks, Mark