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| author | Stefan Metzmacher <metze@samba.org> | 2012-06-14 10:32:43 +0200 |
|---|---|---|
| committer | Stefan Metzmacher <metze@samba.org> | 2012-06-14 18:13:31 +0200 |
| commit | 47f837c105ee7b70b7e80e41772b7c9470bbe153 (patch) | |
| tree | 89d577d7b125953e008ee5fd6cc81006593812de /source3/smbd/files.c | |
| parent | 5662166b231f64ba2003f917057b8ffb8886b8bc (diff) | |
| download | samba-47f837c105ee7b70b7e80e41772b7c9470bbe153.tar.gz samba-47f837c105ee7b70b7e80e41772b7c9470bbe153.tar.bz2 samba-47f837c105ee7b70b7e80e41772b7c9470bbe153.zip | |
s3:smbd: add a fsp_persistent_id() function
This calculates a 64-bit value that most likely uniquely identifies
the files_struct globally to the server.
* 32-bit random gen_id
* 16-bit truncated open_time
* 16-bit fnum (valatile_id)
Based on code from Ira Cooper. Use fsp->fh->gen_id as the persistent
fileid in SMB2.
Pair-Programmed-With: Michael Adam <obnox@samba.org>
metze
Diffstat (limited to 'source3/smbd/files.c')
| -rw-r--r-- | source3/smbd/files.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/source3/smbd/files.c b/source3/smbd/files.c index 3fc36d5783..18330805d8 100644 --- a/source3/smbd/files.c +++ b/source3/smbd/files.c @@ -597,6 +597,30 @@ files_struct *file_fsp(struct smb_request *req, uint16 fid) return fsp; } +uint64_t fsp_persistent_id(const struct files_struct *fsp) +{ + uint64_t persistent_id; + + /* + * This calculates a number that is most likely + * globally unique. In future we will have a database + * to make it completely unique. + * + * 32-bit random gen_id + * 16-bit truncated open_time + * 16-bit fnum (valatile_id) + */ + persistent_id = fsp->fh->gen_id & UINT32_MAX; + persistent_id <<= 16; + persistent_id &= 0x0000FFFFFFFF0000LLU; + persistent_id |= fsp->open_time.tv_usec & UINT16_MAX; + persistent_id <<= 16; + persistent_id &= 0xFFFFFFFFFFFF0000LLU; + persistent_id |= fsp->fnum & UINT16_MAX; + + return persistent_id; +} + struct files_struct *file_fsp_smb2(struct smbd_smb2_request *smb2req, uint64_t persistent_id, uint64_t volatile_id) |