mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 08:25:20 +09:00
f102bc3e5f
Let's not leak details from src/shared and src/libsystemd into src/basic, even though you can't actually do anything useful with just forward declarations from src/shared. The sd-forward.h header is put in src/libsystemd/sd-common as we don't have a directory for shared internal headers for libsystemd yet. Let's also rename forward.h to basic-forward.h to keep things self-explanatory.
53 lines
2.6 KiB
C
53 lines
2.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "shared-forward.h"
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/* Some helpers for setting up loopback block devices */
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typedef struct LoopDevice {
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unsigned n_ref;
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int fd;
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int lock_fd;
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int nr; /* The loopback device index (i.e. 4 for /dev/loop4); if this object encapsulates a non-loopback block device, set to -1 */
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dev_t devno; /* The loopback device's own dev_t */
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char *node;
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sd_device *dev;
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char *backing_file;
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bool relinquished;
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bool created; /* If we created the device */
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dev_t backing_devno; /* The backing file's dev_t */
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ino_t backing_inode; /* The backing file's ino_t */
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uint64_t diskseq; /* Block device sequence number, monothonically incremented by the kernel on create/attach, or 0 if we don't know */
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uint32_t sector_size;
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uint64_t device_size;
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} LoopDevice;
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/* Returns true if LoopDevice object is not actually a loopback device but some other block device we just wrap */
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#define LOOP_DEVICE_IS_FOREIGN(d) ((d)->nr < 0)
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int loop_device_make(int fd, int open_flags, uint64_t offset, uint64_t size, uint32_t sector_size, uint32_t loop_flags, int lock_op, LoopDevice **ret);
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int loop_device_make_by_path_at(int dir_fd, const char *path, int open_flags, uint32_t sector_size, uint32_t loop_flags, int lock_op, LoopDevice **ret);
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static inline int loop_device_make_by_path(const char *path, int open_flags, uint32_t sector_size, uint32_t loop_flags, int lock_op, LoopDevice **ret) {
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return loop_device_make_by_path_at(AT_FDCWD, path, open_flags, sector_size, loop_flags, lock_op, ret);
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}
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int loop_device_make_by_path_memory(const char *path, int open_flags, uint32_t sector_size, uint32_t loop_flags, int lock_op, LoopDevice **ret);
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int loop_device_open(sd_device *dev, int open_flags, int lock_op, LoopDevice **ret);
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int loop_device_open_from_fd(int fd, int open_flags, int lock_op, LoopDevice **ret);
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int loop_device_open_from_path(const char *path, int open_flags, int lock_op, LoopDevice **ret);
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LoopDevice* loop_device_ref(LoopDevice *d);
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LoopDevice* loop_device_unref(LoopDevice *d);
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DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
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void loop_device_relinquish(LoopDevice *d);
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void loop_device_unrelinquish(LoopDevice *d);
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int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);
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int loop_device_flock(LoopDevice *d, int operation);
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int loop_device_sync(LoopDevice *d);
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int loop_device_set_autoclear(LoopDevice *d, bool autoclear);
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int loop_device_set_filename(LoopDevice *d, const char *name);
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