doc/cephfs: add doc for cephfs io path#30369
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batrick merged 1 commit intoceph:masterfrom Oct 29, 2019
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doc/cephfs/cephfs-io-path.rst
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| Ceph File System IO Path | ||
| ========================= | ||
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| The Ceph File System (CephFS) stores file data as RADOS objects. File System |
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Pehaps we can make this paragraph more coherent -
All file data in CephFS is stored as RADOS objects. CephFS clients can directly access RADOS to operate on file data but metadata operations are handled by MDS.
ajarr
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Sep 25, 2019
ajarr
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batrick
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Oct 2, 2019
| To read/write a CephFS file, client needs to have 'file read/write' capabilities | ||
| for corresponding inode. If client does not have required capabilities, it sends | ||
| a 'cap message' to MDS, telling MDS what it wants. MDS will issue capabilities | ||
| to client when it is possible. Once client has 'file read/write' capabilities, |
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This is also a chance to explain how buffered/cached I/O works.
doc/cephfs/cephfs-io-path.rst
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| a 'cap message' to MDS, telling MDS what it wants. MDS will issue capabilities | ||
| to client when it is possible. Once client has 'file read/write' capabilities, | ||
| it can directly access RADOS to read/write file data. File data are stored as | ||
| Rados objects in the form of <inode number>.<object index>. |
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and <inode number>.<object index> is not completely self-explanatory, which is why I suggest talking about file layouts.
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update |
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Fixes: https://tracker.ceph.com/issues/41738 Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
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Doc render available at http://docs.ceph.com/ceph-prs/30369/ |
batrick
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* refs/pull/30369/head: doc/cephfs: add doc for cephfs io path Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
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Fixes: https://tracker.ceph.com/issues/41738
Signed-off-by: "Yan, Zheng" zyan@redhat.com
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