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57413d8e17
The fallocate system call takes a mode argument, but that argument contains a wild mix of exclusive modes and an optional flags. Replace FALLOC_FL_SUPPORTED_MASK with FALLOC_FL_MODE_MASK, which excludes the optional flag bit, so that we can use switch statement on the value to easily enumerate the cases while getting the check for duplicate modes for free. To make this (and in the future the file system implementations) more readable also add a symbolic name for the 0 mode used to allocate blocks. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20240827065123.1762168-4-hch@lst.de Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _FALLOC_H_
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#define _FALLOC_H_
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#include <uapi/linux/falloc.h>
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/*
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* Space reservation ioctls and argument structure
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* are designed to be compatible with the legacy XFS ioctls.
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*/
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struct space_resv {
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__s16 l_type;
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__s16 l_whence;
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__s64 l_start;
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__s64 l_len; /* len == 0 means until end of file */
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__s32 l_sysid;
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__u32 l_pid;
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__s32 l_pad[4]; /* reserved area */
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};
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#define FS_IOC_RESVSP _IOW('X', 40, struct space_resv)
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#define FS_IOC_UNRESVSP _IOW('X', 41, struct space_resv)
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#define FS_IOC_RESVSP64 _IOW('X', 42, struct space_resv)
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#define FS_IOC_UNRESVSP64 _IOW('X', 43, struct space_resv)
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#define FS_IOC_ZERO_RANGE _IOW('X', 57, struct space_resv)
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/*
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* Mask of all supported fallocate modes. Only one can be set at a time.
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*
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* In addition to the mode bit, the mode argument can also encode flags.
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* FALLOC_FL_KEEP_SIZE is the only supported flag so far.
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*/
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#define FALLOC_FL_MODE_MASK (FALLOC_FL_ALLOCATE_RANGE | \
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FALLOC_FL_PUNCH_HOLE | \
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FALLOC_FL_COLLAPSE_RANGE | \
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FALLOC_FL_ZERO_RANGE | \
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FALLOC_FL_INSERT_RANGE | \
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FALLOC_FL_UNSHARE_RANGE)
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/* on ia32 l_start is on a 32-bit boundary */
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#if defined(CONFIG_X86_64)
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struct space_resv_32 {
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__s16 l_type;
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__s16 l_whence;
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__s64 l_start __attribute__((packed));
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/* len == 0 means until end of file */
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__s64 l_len __attribute__((packed));
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__s32 l_sysid;
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__u32 l_pid;
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__s32 l_pad[4]; /* reserve area */
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};
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#define FS_IOC_RESVSP_32 _IOW ('X', 40, struct space_resv_32)
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#define FS_IOC_UNRESVSP_32 _IOW ('X', 41, struct space_resv_32)
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#define FS_IOC_RESVSP64_32 _IOW ('X', 42, struct space_resv_32)
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#define FS_IOC_UNRESVSP64_32 _IOW ('X', 43, struct space_resv_32)
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#define FS_IOC_ZERO_RANGE_32 _IOW ('X', 57, struct space_resv_32)
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#endif
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#endif /* _FALLOC_H_ */
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