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fs/ceph/ioctl.h
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#ifndef FS_CEPH_IOCTL_H #define FS_CEPH_IOCTL_H #include <linux/ioctl.h> #include <linux/types.h> |
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#define CEPH_IOCTL_MAGIC 0x97 |
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/* * CEPH_IOC_GET_LAYOUT - get file layout or dir layout policy * CEPH_IOC_SET_LAYOUT - set file layout * CEPH_IOC_SET_LAYOUT_POLICY - set dir layout policy * * The file layout specifies how file data is striped over objects in * the distributed object store, which object pool they belong to (if * it differs from the default), and an optional 'preferred osd' to * store them on. * * Files get a new layout based on the policy set on the containing * directory or one of its ancestors. The GET_LAYOUT ioctl will let * you examine the layout for a file or the policy on a directory. * * SET_LAYOUT will let you set a layout on a newly created file. This * only works immediately after the file is created and before any * data is written to it. * * SET_LAYOUT_POLICY will let you set a layout policy (default layout) * on a directory that will apply to any new files created in that * directory (or any child directory that doesn't specify a layout of * its own). */ /* use u64 to align sanely on all archs */ |
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struct ceph_ioctl_layout { __u64 stripe_unit, stripe_count, object_size; __u64 data_pool; |
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/* obsolete. new values ignored, always return -1 */ |
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__s64 preferred_osd; |
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}; #define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, \ struct ceph_ioctl_layout) #define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, \ struct ceph_ioctl_layout) |
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#define CEPH_IOC_SET_LAYOUT_POLICY _IOW(CEPH_IOCTL_MAGIC, 5, \ struct ceph_ioctl_layout) |
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/* |
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* CEPH_IOC_GET_DATALOC - get location of file data in the cluster * |
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* Extract identity, address of the OSD and object storing a given * file offset. */ struct ceph_ioctl_dataloc { __u64 file_offset; /* in+out: file offset */ __u64 object_offset; /* out: offset in object */ __u64 object_no; /* out: object # */ __u64 object_size; /* out: object size */ char object_name[64]; /* out: object name */ __u64 block_offset; /* out: offset in block */ __u64 block_size; /* out: block length */ __s64 osd; /* out: osd # */ struct sockaddr_storage osd_addr; /* out: osd address */ }; #define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \ struct ceph_ioctl_dataloc) |
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/* * CEPH_IOC_LAZYIO - relax consistency * * Normally Ceph switches to synchronous IO when multiple clients have * the file open (and or more for write). Reads and writes bypass the * page cache and go directly to the OSD. Setting this flag on a file * descriptor will allow buffered IO for this file in cases where the * application knows it won't interfere with other nodes (or doesn't * care). */ |
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#define CEPH_IOC_LAZYIO _IO(CEPH_IOCTL_MAGIC, 4) |
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/* * CEPH_IOC_SYNCIO - force synchronous IO * * This ioctl sets a file flag that forces the synchronous IO that * bypasses the page cache, even if it is not necessary. This is * essentially the opposite behavior of IOC_LAZYIO. This forces the * same read/write path as a file opened by multiple clients when one * or more of those clients is opened for write. * * Note that this type of sync IO takes a different path than a file * opened with O_SYNC/D_SYNC (writes hit the page cache and are * immediately flushed on page boundaries). It is very similar to * O_DIRECT (writes bypass the page cache) excep that O_DIRECT writes * are not copied (user page must remain stable) and O_DIRECT writes * have alignment restrictions (on the buffer and file offset). */ |
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#define CEPH_IOC_SYNCIO _IO(CEPH_IOCTL_MAGIC, 5) |
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#endif |