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Thu, 05 Nov 2026 16:49:33 -0800 (PST) Received: from pop-os.attlocal.net ([2600:1700:6476:1430:62d1:9ddf:24f7:e87e]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-67c134f0e5fsm851304d50.5.2026.11.05.16.49.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 16:49:32 -0800 (PST) From: Viacheslav Dubeyko To: glaubitz@physik.fu-berlin.de, frank.li@vivo.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, vdubeyko@coreweave.com, Viacheslav Dubeyko Subject: [PATCH 0/2] hfs/hfsplus: set s_maxbytes from the volume capacity Date: Thu, 5 Nov 2026 16:49:21 -0800 Message-ID: <20261106004923.1844283-1-slava@dubeyko.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit HFS and HFS+ do not support sparse files: every byte of a file up to end-of-file has to be backed by an allocated block. As a result, a write, truncate or copy_file_range() far beyond the current end-of-file makes the driver zero-fill the whole gap, which runs out of free space and fails with -ENOSPC rather than reporting -EFBIG. Since a file can never be larger than the volume, this series sets s_maxbytes to the volume capacity instead (capped by MAX_LFS_FILESIZE for HFS+ and by MAX_NON_LFS for HFS). The VFS then returns -EFBIG for write(), copy_file_range(), truncate and fallocate beyond the limit, and trims writes that straddle it. The now redundant local checks are removed. Viacheslav Dubeyko (2): hfsplus: set s_maxbytes from the volume capacity hfs: set s_maxbytes from the volume capacity fs/hfs/inode.c | 7 ------- fs/hfs/super.c | 8 ++++++++ fs/hfsplus/inode.c | 7 ------- fs/hfsplus/super.c | 10 +++++++++- 4 files changed, 17 insertions(+), 15 deletions(-) -- 2.43.0