2 * Copyright (c) 1990,1995 Regents of The University of Michigan.
3 * All Rights Reserved. See COPYRIGHT.
11 #include <sys/types.h>
12 #include <sys/param.h>
18 #include <atalk/adouble.h>
21 #define MIN(a,b) ((a)<(b)?(a):(b))
24 /* XXX: this would benefit from pwrite.
25 * locking has to be checked before each stream of consecutive
26 * ad_writes to prevent a lock in the middle from causing problems.
28 ssize_t ad_write( ad, eid, off, end, buf, buflen )
39 if ( eid == ADEID_DFORK ) {
41 if ( fstat( ad->ad_df.adf_fd, &st ) < 0 ) {
44 off = st.st_size - off;
47 if ( ad->ad_df.adf_off != off ) {
48 if ( lseek( ad->ad_df.adf_fd, (off_t) off, SEEK_SET ) < 0 ) {
51 ad->ad_df.adf_off = off;
53 cc = write( ad->ad_df.adf_fd, buf, buflen );
57 ad->ad_df.adf_off += cc;
60 off = ad->ad_eid[ eid ].ade_len - off;
62 cc = ad->ad_eid[eid].ade_off + off;
64 #ifdef USE_MMAPPED_HEADERS
65 if (eid != ADEID_RFORK) {
66 memcpy(ad->ad_data + cc, buf, buflen);
72 if ( ad->ad_hf.adf_off != cc ) {
73 if ( lseek( ad->ad_hf.adf_fd, (off_t) cc, SEEK_SET ) < 0 ) {
76 ad->ad_hf.adf_off = cc;
79 if ((cc = write( ad->ad_hf.adf_fd, buf, buflen )) < 0)
81 ad->ad_hf.adf_off += cc;
83 #ifndef USE_MMAPPED_HEADERS
84 /* sync up our internal buffer */
85 if (ad->ad_hf.adf_off < ad_getentryoff(ad, ADEID_RFORK))
86 memcpy(ad->ad_data + ad->ad_hf.adf_off, buf,
87 MIN(sizeof(ad->ad_data) - ad->ad_hf.adf_off, cc));
91 if ( ad->ad_eid[ eid ].ade_len < off + cc ) {
92 ad->ad_eid[ eid ].ade_len = off + cc;
100 int ad_rtruncate( ad, size )
106 if (ad_tmplock(ad, ADEID_RFORK, ADLOCK_WR, 0, 0) < 0)
109 if ( ftruncate( ad->ad_hf.adf_fd,
110 size + ad->ad_eid[ ADEID_RFORK ].ade_off ) < 0 ) {
112 ad_tmplock(ad, ADEID_RFORK, ADLOCK_CLR, 0, 0);
117 ad->ad_eid[ ADEID_RFORK ].ade_len = size;
118 if ( lseek( ad->ad_hf.adf_fd, ad->ad_eid[ADEID_RFORK].ade_off,
121 ad_tmplock(ad, ADEID_RFORK, ADLOCK_CLR, 0, 0);
126 ad->ad_hf.adf_off = ad->ad_eid[ADEID_RFORK].ade_off;
127 ad_tmplock(ad, ADEID_RFORK, ADLOCK_CLR, 0, 0);
131 int ad_dtruncate(ad, size)
137 if (ad_tmplock(ad, ADEID_DFORK, ADLOCK_WR, 0, 0) < 0)
140 if (ftruncate(ad->ad_df.adf_fd, size) < 0) {
142 ad_tmplock(ad, ADEID_DFORK, ADLOCK_CLR, 0, 0);
145 ad_tmplock(ad, ADEID_DFORK, ADLOCK_CLR, 0, 0);