我的毕设,我要看下边的代码~!!!只是一部分2楼贴

#defineDOEXTENT(fs, lbn, boff, bnp, lenp, size, tblp, n, chkfrag, maxtrans) {\//确定地址范围register daddr32_t *dp = (tblp);\register int _chkfrag = chkfrag; /* for lint. sigh */\\if (*dp == 0) {\*(bnp) = ;\} else {\register int len;\\len = findextent(fs, dp, (int)(n), lenp, maxtrans) << \//得到文件长度(fs)->fs_bshift; \if (_chkfrag) {\register u_offset_t tmp;\\tmp = fragroundup((fs), size) -\ (((u_offset_t)lbn) << fs->fs_bshift);\len = (int)MIN(tmp, len);\}\len -= (boff);\if (len <= 0) {\*(bnp) = UFS_HOLE;\} else {\*(bnp) = fsbtodb(fs, *dp) + btodb(boff);\*(lenp) = len;\}\}\}

int bmap_write(struct inode*ip,u_offset_t off,int size,int alloc_only,struct cred*cr){structfs *fs;structbuf *
bp
;inti;structbuf *nbp;intj;intshft;/* we maintain sh = 1 << shft */daddr_tob, nb, pref, lbn, llbn, tbn;daddr32_t *bap;structvnode *vp = ITOV(ip);longbsize = VBSIZE(vp);longosize, nsize;intissync, metaflag, isdirquota;interr;dev_tdev;structfbuf *fbp;intnindirshift;intnindiroffset;structufsvfs*ufsvfsp;intadded_sectors;/* sectors added to this inode */intalloced_blocks;/* fs blocks newly allocated */struct ufs_allocated_block undo_table[NIADDR+1];intverylargefile = 0;ASSERT(RW_WRITE_HELD(&ip->i_contents));ufsvfsp = ip->i_ufsvfs;fs = ufsvfsp->vfs_bufp->b_un.b_fs;lbn = (daddr_t)lblkno(fs, off);if (lbn < 0)return (EFBIG);if (ip->i_blocks >= VERYLARGEFILESIZE)verylargefile = 1;llbn = (daddr_t)((ip->i_size) ? lblkno(fs, ip->i_size - 1) : 0);metaflag = isdirquota = 0;if (((ip->i_mode & IFMT) == IFDIR) || ((ip->i_mode & IFMT) == IFATTRDIR))isdirquota = metaflag = I_DIR;else if ((ip->i_mode & IFMT) == IFSHAD)metaflag = I_SHAD;else if (ip->i_ufsvfs->vfs_qinod == ip)isdirquota = metaflag = I_QUOTA;issync = ((ip->i_flag & ISYNC) != 0);if (isdirquota || issync) {alloc_only = 0;/* make sure */}/* * If the next write will extend the file into a new block, * and the file is currently composed of a fragment * this fragment has to be extended to be a full block. */if (llbn < NDADDR && llbn < lbn && (ob = ip->i_db[llbn]) != 0) {osize = blksize(fs, ip, llbn);if (osize < bsize && osize > 0) {/* * Check to see if doing this will make the file too * big. Only check if we are dealing with a very * large file. */if (verylargefile == 1) {if (((unsigned)ip->i_blocks + btodb(bsize - osize)) > INT_MAX) {return (EFBIG);}}/* * Make sure we have all needed pages setup correctly. * * We pass S_OTHER to fbread here because we want * an exclusive lock on the page in question * (see ufs_getpage). I/O to the old block location * may still be in progress and we are about to free * the old block. We don't want anyone else to get * a hold of the old block once we free it until * the I/O is complete. */err = fbread(ITOV(ip), ((offset_t)llbn << fs->fs_bshift),(uint_t)bsize, S_OTHER, &fbp);if (err)return (err);pref = blkpref(ip, llbn, (int)llbn, &ip->i_db[0]);err = realloccg(ip, ob, pref, (int)osize, (int)bsize,&nb, cr);if (err) {if (fbp)fbrelse(fbp, S_OTHER);return (err);}ASSERT(!ufs_badblock(ip, nb));

/* * Update the inode before releasing the * lock on the page. If we released the page * lock first, the data could be written to it's * old address and then destroyed. */TRANS_MATA_ALLOC(ufsvfsp, ip, nb, bsize, 0);ip->i_db[llbn] = nb;UFS_SET_ISIZE(((u_offset_t)(llbn + 1)) << fs->fs_bshift, ip);ip->i_blocks += btodb(bsize - osize);ASSERT((unsigned)ip->i_blocks <= INT_MAX);TRANS_INODE(ufsvfsp, ip);ip->i_flag |= IUPD | ICHG | IATTCHG;/* Caller is responsible for updating i_seq *//* * Don't check metaflag here, directories won't do this * */if (issync) {(void) ufs_fbiwrite(fbp, ip, nb, fs->fs_fsize);} else {ASSERT(fbp);fbrelse(fbp, S_WRITE);}if (nb != ob) {(void) free(ip, ob, (off_t)osize, metaflag);}}}

/* * The first NDADDR blocks are direct blocks. */if (lbn < NDADDR) {nb = ip->i_db[lbn];if (nb == 0 || ip->i_size < ((u_offset_t)(lbn + 1)) << fs->fs_bshift) {if (nb != 0) {/* consider need to reallocate a frag */osize = fragroundup(fs, blkoff(fs, ip->i_size));nsize = fragroundup(fs, size);if (nsize <= osize)goto gotit;/* * Check to see if doing this will make the * file too big. Only check if we are dealing * with a very large file. */if (verylargefile == 1) {if (((unsigned)ip->i_blocks + btodb(nsize - osize)) > INT_MAX) {return (EFBIG);}}/* * need to allocate a block or frag */ob = nb;pref = blkpref(ip, lbn, (int)lbn,&ip->i_db[0]);err = realloccg(ip, ob, pref, (int)osize,(int)nsize, &nb, cr);if (err)return (err);ASSERT(!ufs_badblock(ip, nb));} else {/* * need to allocate a block or frag */osize = 0;if (ip->i_size < ((u_offset_t)(lbn + 1)) << fs->fs_bshift)nsize = fragroundup(fs, size);elsensize = bsize;/* * Check to see if doing this will make the * file too big. Only check if we are dealing * with a very large file. */if (verylargefile == 1) {if (((unsigned)ip->i_blocks + btodb(nsize - osize)) > INT_MAX) {return (EFBIG);}}pref = blkpref(ip, lbn, (int)lbn, &ip->i_db[0]);err = alloc(ip, pref, (int)nsize, &nb, cr);if (err)return (err);ASSERT(!ufs_badblock(ip, nb));ob = nb;}

s什么东西啊??

看不懂你不可以贴写我懂的啊?晕

不贴了...怕吓坏大家...就贴了一个函数....

我的东西应该是没有你看的懂的.....

好啊~~~~~~~~```

那你这程序是用来赶什么的呢???你说说用中国话!!

天天看代码身体倍儿棒,吃骂骂香,干骂骂不成

我头疼~~~~~~我今天恶心坏了~~~~~~~

一个爪子也要那么复杂干吗啊~~

这是一个操作系统的源代码不是我写的我是分析这些东西然后写出流程

C++？？？

C语言的爽死了...大一学的...全忘了

蚊子~~~~~~~来这说~~~~~~表水了人家的楼~~~~~~~~~

踩死蚂蚁你们水我楼心安理得啊

....你真的厉害爪子你JJ我曾今很窝囊.....唉居然为闹计算机的数据库考试可以及格...都上美人计闹!靠