1 |
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2 DROP TABLE IF EXISTS file_tree; |
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3 DROP TABLE IF EXISTS inodes; |
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4 DROP SEQUENCE IF EXISTS ino_seq; |
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5 |
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6 CREATE SEQUENCE ino_seq START 64; |
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7 |
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8 -- inodes |
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9 CREATE TABLE inodes ( |
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10 ino int4 primary key DEFAULT nextval('ino_seq'::regclass), |
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11 type char(3) NOT NULL, |
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12 mode int2 NOT NULL, |
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13 data oid, |
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14 link_path varchar(512), |
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15 |
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16 -- sanity checks |
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17 CONSTRAINT inodes_valid_reg CHECK (data IS NULL OR type = 'REG'), |
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18 CONSTRAINT inodes_valid_lnk CHECK (link_path IS NULL OR type = 'LNK') |
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19 ); |
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20 |
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21 -- filesystem layout |
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22 CREATE TABLE file_tree ( |
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23 "offset" serial4 primary key, |
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24 name varchar(256), |
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25 ino int4 references inodes(ino) NOT NULL, |
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26 ino_dir int4 references inodes(ino), |
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27 parent int4, |
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28 |
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29 -- structure |
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30 CONSTRAINT file_tree_uniq_direntry UNIQUE (parent, name), |
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31 CONSTRAINT file_tree_uniq_dir_ino UNIQUE (ino_dir), |
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32 CONSTRAINT file_tree_exist_parent FOREIGN KEY (parent) REFERENCES file_tree(ino_dir), |
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33 |
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34 -- sanity checks |
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35 CONSTRAINT file_tree_valid_root CHECK ((parent IS NULL AND name IS NULL AND ino = 1) OR (name IS NOT NULL and parent IS NOT NULL AND ino != 1)), |
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36 CONSTRAINT file_tree_valid_dir CHECK (ino_dir IS NULL OR ino_dir = ino) |
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37 ); |
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38 |
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39 INSERT INTO inodes (ino, type, mode, data) VALUES |
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40 (1, 'DIR', 365, NULL), |
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41 (2, 'REG', 292, lo_create(0)); |
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42 |
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43 INSERT INTO file_tree (name, parent, ino, ino_dir) VALUES |
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44 (NULL, NULL, 1, 1 ), |
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45 ('foo', 1, 2, NULL ); |
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46 |
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47 -- not sure how these work, I guess statements in functions aren't their own transactions |
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48 CREATE OR REPLACE FUNCTION lo_pread_oid (IN obj oid, IN len int4, IN "off" int4) RETURNS bytea LANGUAGE SQL STRICT AS 'select lo_open($1, 393216); select lo_lseek(0, $3, 0); select loread(0, $2);'; |
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49 CREATE OR REPLACE FUNCTION lo_pwrite_oid (IN obj oid, IN buf bytea, IN "off" int4) RETURNS int4 LANGUAGE SQL STRICT AS 'select lo_open($1, 393216); select lo_lseek(0, $3, 0); select lowrite(0, $2);'; |
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50 |
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51 CREATE OR REPLACE FUNCTION lo_otruncate (IN obj oid, IN len int4) RETURNS oid LANGUAGE SQL STRICT AS 'select lo_truncate(lo_open($1, 393216), $2); select $1;'; |
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52 CREATE OR REPLACE FUNCTION lo_size (oid) RETURNS int4 LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT AS 'select lo_lseek(lo_open($1, 262144), 0, 2);'; |
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53 CREATE OR REPLACE FUNCTION dbfs_size (type char, oid, link varchar) RETURNS int4 LANGUAGE SQL STABLE AS $$ |
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54 SELECT CASE $1 |
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55 WHEN 'LNK' THEN char_length($3) |
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56 WHEN 'REG' THEN lo_size($2) |
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57 ELSE 0 |
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58 END; |
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59 $$; |
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60 |
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61 CREATE OR REPLACE FUNCTION dbfs_link ( |
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62 IN ino int4, IN new_parent int4, IN new_name varchar, |
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63 OUT ino int4, OUT type char(3), OUT mode int2, OUT size int4, OUT nlink int8 |
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64 ) LANGUAGE SQL VOLATILE AS $$ |
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65 INSERT INTO file_tree (name, ino, parent) VALUES ($3, $1, $2); |
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66 SELECT ino, type, mode, dbfs_size(type, data, link_path) AS size, (SELECT COUNT(*) FROM inodes i LEFT JOIN file_tree ft ON (i.ino = ft.ino) WHERE i.ino = inodes.ino) AS nlink |
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67 FROM inodes WHERE ino = $1; |
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68 $$; |
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