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journal.c：源码内容
							/*
 * Intermezzo. (C) 1998 Peter J. Braam
 *
 * Support for journalling extended attributes
 * (C) 2001 Shirish H. Phatak, Tacit Networks, Inc.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/intermezzo_fs.h>
#include <linux/intermezzo_upcall.h>
#include <linux/intermezzo_psdev.h>
#include <linux/intermezzo_kml.h>
static int presto_log(struct presto_file_set *fset, struct rec_info *rec,
                      const char *buf, size_t size,
                      const char *string1, int len1, 
                      const char *string2, int len2,
                      const char *string3, int len3);
/*
 *  reserve record space and/or atomically request state of the log
 *  rec will hold the location reserved record upon return
 *  this reservation will be placed in the queue
 */ 
static void presto_reserve_record(struct presto_file_set *fset, 
                           struct presto_log_fd *fd, 
                           struct rec_info *rec,
                           struct presto_reservation_data *rd)
{
        int chunked_record = 0; 
        ENTRY;
        
        write_lock(&fd->fd_lock);
        if ( rec->is_kml ) { 
                int chunk = 1 << fset->fset_chunkbits;
                int chunk_mask = ~(chunk -1); 
                loff_t boundary; 
                boundary =  (fd->fd_offset + chunk - 1) & chunk_mask;
                if ( fd->fd_offset + rec->size >= boundary ) {
                        chunked_record = 1;
                        fd->fd_offset = boundary; 
                }
        }
        fd->fd_recno++;
        
        /* this move the fd_offset back after truncation */ 
        if ( list_empty(&fd->fd_reservations) && 
             !chunked_record) { 
                fd->fd_offset = fd->fd_file->f_dentry->d_inode->i_size;
        }
        rec->offset = fd->fd_offset;
        rec->recno = fd->fd_recno;
        fd->fd_offset += rec->size;
        /* add the reservation data to the end of the list */
        list_add(&rd->ri_list, fd->fd_reservations.prev);
        rd->ri_offset = rec->offset;
        rd->ri_size = rec->size;
        rd->ri_recno = rec->recno; 
        write_unlock(&fd->fd_lock); 
        EXIT;
}
static inline void presto_release_record(struct presto_log_fd *fd,
                                         struct presto_reservation_data *rd)
{
        write_lock(&fd->fd_lock);
        list_del(&rd->ri_list);
        write_unlock(&fd->fd_lock);
}
static int presto_do_truncate(struct presto_file_set *fset, 
                              struct dentry *dentry, loff_t length, 
                              loff_t size_check)
{
        struct inode *inode = dentry->d_inode;
        struct inode_operations *op; 
        int error;
        struct iattr newattrs;
        ENTRY;
        /* Not pretty: "inode->i_size" shouldn't really be "loff_t". */
        if ((off_t) length < 0)
                return -EINVAL;
        fs_down(&inode->i_sem);
        lock_kernel();
        
        if (size_check != inode->i_size) { 
                unlock_kernel();
                fs_up(&inode->i_sem);
                EXIT;
                return -EALREADY; 
        }
        newattrs.ia_size = length;
        newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
        op = filter_c2cfiops(fset->fset_cache->cache_filter);
        if (op != NULL && op->setattr != NULL)
                error = op->setattr(dentry, &newattrs);
        else {
                inode_setattr(dentry->d_inode, &newattrs);
                /* Some filesystems, e.g. ext2 and older versions of ext3
                   legitimately do not have a <fs>_setattr method. -SHP
                */
                /*
                printk ("Warning:: int presto_do_truncate(xxx), op->setattr == NULL");
		error = -EOPNOTSUPP; 
		*/
		error = 0;
        }
        unlock_kernel();
        fs_up(&inode->i_sem);
        EXIT;
        return error;
}
void *presto_trans_start(struct presto_file_set *fset, struct inode *inode,
                         int op)
{
        ENTRY;
        if ( !fset->fset_cache->cache_filter->o_trops )
                return NULL;
        EXIT;
        return fset->fset_cache->cache_filter->o_trops->tr_start
                (fset, inode, op);
}
void presto_trans_commit(struct presto_file_set *fset, void *handle)
{
        ENTRY;
        if (!fset->fset_cache->cache_filter->o_trops )
                return;
        EXIT;
        return fset->fset_cache->cache_filter->o_trops->tr_commit(fset, handle);
}
inline int presto_no_journal(struct presto_file_set *fset)
{
        int minor = fset->fset_cache->cache_psdev->uc_minor;
        return upc_comms[minor].uc_no_journal;
}
#define size_round(x)  (((x)+3) & ~0x3)
#define BUFF_FREE(buf) PRESTO_FREE(buf, PAGE_SIZE)
#define BUFF_ALLOC(newbuf, oldbuf)                      
        PRESTO_ALLOC(newbuf, char *, PAGE_SIZE);        
        if ( !newbuf ) {                                
                if (oldbuf)                             
                        BUFF_FREE(oldbuf);              
                return -ENOMEM;                         
        }
/*
 * "buflen" should be PAGE_SIZE or more.
 * Give relative path wrt to a fsetroot
 */
char * presto_path(struct dentry *dentry, struct dentry *root,
                   char *buffer, int buflen)
{
        char * end = buffer+buflen;
        char * retval;
        *--end = '';
        buflen--;
        if (dentry->d_parent != dentry && list_empty(&dentry->d_hash)) {
                buflen -= 10;
                end -= 10;
                memcpy(end, " (deleted)", 10);
        }
        /* Get '/' right */
        retval = end-1;
        *retval = '/';
        for (;;) {
                struct dentry * parent;
                int namelen;
                if (dentry == root)
                        break;
                parent = dentry->d_parent;
                if (dentry == parent)
                        break;
                namelen = dentry->d_name.len;
                buflen -= namelen + 1;
                if (buflen < 0)
                        break;
                end -= namelen;
                memcpy(end, dentry->d_name.name, namelen);
                *--end = '/';
                retval = end;
                dentry = parent;
        }
        return retval;
}
static inline char *logit(char *buf, const void *value, int size)
{
        char *ptr = (char *)value;
        memcpy(buf, ptr, size);
        buf += size;
        return buf;
}
static inline char *
journal_log_prefix_with_groups_and_ids(char *buf, int opcode, 
                                       struct rec_info *rec,
                                       __u32 ngroups, gid_t *groups,
                                       __u32 fsuid, __u32 fsgid)
{
        struct big_journal_prefix p;
        int i; 
        p.len = cpu_to_le32(rec->size);
        p.version = PRESTO_KML_MAJOR_VERSION | PRESTO_KML_MINOR_VERSION;
        p.pid = cpu_to_le32(current->pid);
        p.uid = cpu_to_le32(current->uid);
        p.fsuid = cpu_to_le32(fsuid);
        p.fsgid = cpu_to_le32(fsgid);
        p.ngroups = cpu_to_le32(ngroups);
        p.opcode = cpu_to_le32(opcode);
        for (i=0 ; i < ngroups ; i++)
                p.groups[i] = cpu_to_le32((__u32) groups[i]);
        buf = logit(buf, &p, sizeof(struct journal_prefix) + 
                    sizeof(__u32) * ngroups);
        return buf;
}
static inline char *
journal_log_prefix(char *buf, int opcode, struct rec_info *rec)
{
	__u32 groups[NGROUPS_MAX]; 
	int i; 
	/* convert 16 bit gid's to 32 bit gid's */
	for (i=0; i<current->ngroups; i++) 
		groups[i] = (__u32) current->groups[i];
	
        return journal_log_prefix_with_groups_and_ids(buf, opcode, rec,
                                                      (__u32)current->ngroups,
						      groups,
                                                      (__u32)current->fsuid,
                                                      (__u32)current->fsgid);
}
static inline char *
journal_log_prefix_with_groups(char *buf, int opcode, struct rec_info *rec, 
                               __u32 ngroups, gid_t *groups)
{
        return journal_log_prefix_with_groups_and_ids(buf, opcode, rec,
                                                      ngroups, groups,
                                                      (__u32)current->fsuid,
                                                      (__u32)current->fsgid);
}
static inline char *log_version(char *buf, struct dentry *dentry)
{
        struct presto_version version;
        presto_getversion(&version, dentry->d_inode);
        return logit(buf, &version, sizeof(version));
}
static inline char *journal_log_suffix(char *buf, char *log,
                                       struct presto_file_set *fset,
                                       struct dentry *dentry,
                                       struct rec_info *rec)
{
        struct journal_suffix s;
        struct journal_prefix *p = (struct journal_prefix *)log;
#if 0
	/* XXX needs to be done after reservation, 
	   disable ths until version 1.2 */
        if ( dentry ) { 
                s.prevrec = cpu_to_le32(rec->offset - dentry->d_time);
                dentry->d_time = (unsigned long) rec->offset;
        } else { 
                s.prevrec = -1;
        }
#endif
	s.prevrec = 0; 
        /* record number needs to be filled in after reservation 
           s.recno = cpu_to_le32(rec->recno); */ 
        s.time = cpu_to_le32(CURRENT_TIME);
        s.len = cpu_to_le32(p->len);
        return logit(buf, &s, sizeof(s));
}
int presto_close_journal_file(struct presto_file_set *fset)
{
        int rc = 0;
        int rc2 = 0;
        int rc3 = 0;
        ENTRY;
        if ( fset->fset_kml.fd_file) {
                rc =filp_close(fset->fset_kml.fd_file, 0);
                fset->fset_kml.fd_file = NULL;
        } else {
                printk("hehehehe no filpn");
        }
        if ( rc ) {
                printk("presto: close files: kml filp won't close %dn", rc);
        }
        if ( fset->fset_last_rcvd) {
                rc2 = filp_close(fset->fset_last_rcvd, 0);
                fset->fset_last_rcvd = NULL;
        } else {
                printk("hehehehe no filpn");
        }
        if ( rc2 ) {
                if ( !rc )
                        rc = rc2;
                printk("presto: close files: last_rcvd filp won't close %dn", rc2);
        }
        if ( fset->fset_lml.fd_file) {
                rc3 = filp_close(fset->fset_lml.fd_file, 0);
                fset->fset_lml.fd_file = NULL;
        } else {
                printk("hehehehe no filpn");
        }
        if ( rc3 ) {
                if ( (!rc) && (!rc2) )
                        rc = rc3;
                printk("presto: close files: lml filp won't close %dn", rc3);
        }
        return rc;
}
int presto_fwrite(struct file *file, const char *str, int len, loff_t *off)
{
        int rc;
        mm_segment_t old_fs;
        ENTRY;
        rc = -EINVAL;
        if ( !off ) {
                EXIT;
                return rc;
        }
        if ( ! file ) {
                EXIT;
                return rc;
        }
        if ( ! file->f_op ) {
                EXIT;
                return rc;
        }
        if ( ! file->f_op->write ) {
                EXIT;
                return rc;
        }
        old_fs = get_fs();
        set_fs(get_ds());
        rc = file->f_op->write(file, str, len, off);
        if (rc != len) {
                printk("presto_fwrite: wrote %d bytes instead of "
                       "%d at %ldn", rc, len, (long)*off);
                rc = -EIO; 
        }
        set_fs(old_fs);
        EXIT;
        return rc;
}
int presto_fread(struct file *file, char *str, int len, loff_t *off)
{
        int rc;
        mm_segment_t old_fs;
        ENTRY;
        if ( len > 512 ) {
                printk("presto_fread: read at %Ld for %d bytes, ino %ldn",
                       *off, len, file->f_dentry->d_inode->i_ino); 
        }
        rc = -EINVAL;
        if ( !off ) {
                EXIT;
                return rc;
        }
        if ( ! file ) {
                EXIT;
                return rc;
        }
        if ( ! file->f_op ) {
                EXIT;
                return rc;
        }
        if ( ! file->f_op->read ) {
                EXIT;
                return rc;
        }
        old_fs = get_fs();
        set_fs(get_ds());
        rc = file->f_op->read(file, str, len, off);
        if (rc != len) {
                printk("presto_fread: read %d bytes instead of "
                       "%d at %ldn", rc, len, (long)*off);
                rc = -EIO; 
        }
        set_fs(old_fs);
        return rc;
}
static int presto_kml_dispatch(struct presto_file_set *fset)
{
        int rc = 0;
        unsigned int kml_recno;
        struct presto_log_fd *fd = &fset->fset_kml;
        loff_t  offset;
        ENTRY;
        write_lock(&fd->fd_lock); 
        /* Determine the largest valid offset, i.e. up until the first
         * reservation held on the file. */
        if ( !list_empty(&fd->fd_reservations) ) {
                struct presto_reservation_data *rd;
                rd = list_entry(fd->fd_reservations.next, 
                                struct presto_reservation_data, 
                                ri_list);
                offset = rd->ri_offset;
                kml_recno = rd->ri_recno;
        } else {
                offset = fd->fd_file->f_dentry->d_inode->i_size;
                kml_recno = fset->fset_kml.fd_recno; 
        }
        if ( kml_recno < fset->fset_lento_recno ) {
                printk("presto_kml_dispatch: smoke is comingn"); 
                write_unlock(&fd->fd_lock);
                return 0; 
        } else if ( kml_recno == fset->fset_lento_recno ) {
                write_unlock(&fd->fd_lock);
                EXIT;
                return 0; 
        }
        CDEBUG(D_PIOCTL, "fset: %sn", fset->fset_name);
        rc = lento_kml(fset->fset_cache->cache_psdev->uc_minor,
                       fset->fset_lento_off, fset->fset_lento_recno,
                       offset, kml_recno, strlen(fset->fset_name),
                       fset->fset_name);
        if ( rc ) {
                write_unlock(&fd->fd_lock);
                EXIT;
                return rc;
        }
        fset->fset_lento_off = offset;
        fset->fset_lento_recno = kml_recno; 
        write_unlock(&fd->fd_lock);
        EXIT;
        return 0;
}
/* structure of an extended log record:
   buf-prefix  buf-body [string1 [string2 [string3]]] buf-suffix
   note: moves offset forward
*/
static inline int presto_write_record(struct file *f, loff_t *off,
                        const char *buf, size_t size,
                        const char *string1, int len1, 
                        const char *string2, int len2,
                        const char *string3, int len3)
{
        size_t prefix_size; 
        int rc;
        prefix_size = size - sizeof(struct journal_suffix);
        rc = presto_fwrite(f, buf, prefix_size, off);
        if ( rc != prefix_size ) {
                printk("Write error!n");
                EXIT;
                return -EIO;
        }
        if  ( string1  && len1 ) {
                rc = presto_fwrite(f, string1, len1, off);
                if ( rc != len1 ) {
                        printk("Write error!n");
                        EXIT;
                        return -EIO;
                }
        }
        if  ( string2 && len2 ) {
                rc = presto_fwrite(f, string2, len2, off);
                if ( rc != len2 ) {
                        printk("Write error!n");
                        EXIT;
                        return -EIO;
                }
        }
        if  ( string3 && len3 ) {
                rc = presto_fwrite(f, string3, len3, off);
                if ( rc != len3 ) {
                        printk("Write error!n");
                        EXIT;
                        return -EIO;
                }
        }
        rc = presto_fwrite(f, buf + prefix_size,
                           sizeof(struct journal_suffix), off);
        if ( rc != sizeof(struct journal_suffix) ) {
                printk("Write error!n");
                EXIT;
                return -EIO;
        }
        return 0;
}
/*
 * rec->size must be valid prior to calling this function.
 */
static int presto_log(struct presto_file_set *fset, struct rec_info *rec,
                      const char *buf, size_t size,
                      const char *string1, int len1, 
                      const char *string2, int len2,
                      const char *string3, int len3)
{
        int rc;
        struct presto_reservation_data rd;
        loff_t offset;
        struct presto_log_fd *fd;
        struct journal_suffix *s;
        int prefix_size; 
        ENTRY;
        /* buf is NULL when no_journal is in effect */
        if (!buf) {
                EXIT;
                return -EINVAL;
        }
        if (rec->is_kml) {
                fd = &fset->fset_kml;
        } else {
                fd = &fset->fset_lml;
        }
        presto_reserve_record(fset, fd, rec, &rd);
        offset = rec->offset;
        /* now we know the record number */ 
        prefix_size = size - sizeof(struct journal_suffix);
        s = (struct journal_suffix *) (buf + prefix_size); 
        s->recno =  cpu_to_le32(rec->recno); 
        rc = presto_write_record(fd->fd_file, &offset, buf, size, 
                                 string1, len1, string2, len2, string3, len3); 
        if (rc) {
                printk("presto: error writing record to %sn",
                        rec->is_kml ? "KML" : "LML"); 
                return rc;
        }
        presto_release_record(fd, &rd);
        rc = presto_kml_dispatch(fset);
        EXIT;
        return rc;
}
/* read from the record at tail */
static int presto_last_record(struct presto_log_fd *fd, loff_t *size, 
                             loff_t *tail_offset, __u32 *recno, loff_t tail)
{
        struct journal_suffix suffix;
        int rc;
        loff_t zeroes;
        *recno = 0;
        *tail_offset = 0;
        *size = 0;
        
        if (tail < sizeof(struct journal_prefix) + sizeof(suffix)) {
                EXIT;
                return 0;
        }
        zeroes = tail - sizeof(int);
        while ( zeroes >= 0 ) {
                int data;
                rc = presto_fread(fd->fd_file, (char *)&data, sizeof(data), 
                                  &zeroes);
                if ( rc != sizeof(data) ) { 
                        rc = -EIO;
                        return rc;
                }
                if (data)
                        break;
                zeroes -= 2 * sizeof(data);
        }
        /* zeroes at the begining of file. this is needed to prevent
	   presto_fread errors  -SHP
	*/
        if (zeroes <= 0) return 0;
                       
        zeroes -= sizeof(suffix);
        rc = presto_fread(fd->fd_file, (char *)&suffix, sizeof(suffix), &zeroes);
        if ( rc != sizeof(suffix) ) {
                EXIT;
                return rc;
        }
        if ( suffix.len > 500 ) {
                printk("PRESTO: Warning long record tail at %ld, rec tail_offset at %ld (size %d)n", 
                        (long) zeroes, (long)*tail_offset, suffix.len); 
        }
        *recno = suffix.recno;
        *size = suffix.len;
        *tail_offset = zeroes;
        return 0;
}
static int presto_kml_last_recno(struct presto_file_set *fset)
{
        int rc; 
        loff_t size;
        loff_t tail_offset;
        int recno;
        loff_t tail = fset->fset_kml.fd_file->f_dentry->d_inode->i_size;
        if ((rc = presto_last_record(&fset->fset_kml, &size, 
                                        &tail_offset, &recno, tail)) ) {
                EXIT;
                return rc;
        }
        fset->fset_kml.fd_offset = tail_offset;
        fset->fset_kml.fd_recno = recno;
        CDEBUG(D_JOURNAL, "setting fset_kml->fd_recno to %d, offset  %Ldn",
               recno, tail_offset); 
        EXIT;
        return 0;
}
static struct file *presto_log_open(struct presto_file_set *fset, char *name, int flags)
{
        struct presto_cache *cache = fset->fset_cache;
        struct file *f;
        int error;
        int mtpt_len, path_len;
        char *path;
        ENTRY;
        mtpt_len = strlen(cache->cache_mtpt);
        path_len = mtpt_len + strlen("/.intermezzo/") +
                strlen(fset->fset_name) + strlen(name);
        error = -ENOMEM;
        PRESTO_ALLOC(path, char *, path_len + 1);
        if ( !path ) {
                EXIT;
                return ERR_PTR(-ENOMEM);
        }
        sprintf(path, "%s/.intermezzo/%s/%s", cache->cache_mtpt,
                fset->fset_name, name);
        CDEBUG(D_INODE, "opening file %sn", path);
        f = filp_open(path, flags, 0);
        error = PTR_ERR(f);
        if (IS_ERR(f)) {
                CDEBUG(D_INODE, "Error %dn", error);
                EXIT;
                goto out_free;
        }
        error = -EINVAL;
        if ( cache != presto_get_cache(f->f_dentry->d_inode) ) {
                printk("PRESTO: %s cache does not match fset cache!n", name);
                fset->fset_kml.fd_file = NULL;
                filp_close(f, NULL);
                goto out_free;
        }
        if (cache->cache_filter &&  cache->cache_filter->o_trops &&
	    cache->cache_filter->o_trops->tr_journal_data) {
		CDEBUG(D_INODE, "n");
                cache->cache_filter->o_trops->tr_journal_data
                        (f->f_dentry->d_inode);
        } else {
                printk("WARNING: InterMezzo no file data logging!n"); 
        }
 out_free:
        PRESTO_FREE(path, path_len + 1);
        EXIT;
        return f;
}
int presto_init_kml_file(struct presto_file_set *fset)
{
        int error = 0;
        struct file *f;
        ENTRY;
        if (fset->fset_kml.fd_file) {
                CDEBUG(D_INODE, "fset already has KML openn");
                EXIT;
                return 0;
        }
        fset->fset_kml.fd_lock = RW_LOCK_UNLOCKED;
        INIT_LIST_HEAD(&fset->fset_kml.fd_reservations); 
        f = presto_log_open(fset, "kml",  O_RDWR | O_CREAT);
        if ( IS_ERR(f) ) {
                error = PTR_ERR(f);
                return error;
        }
        fset->fset_kml.fd_file = f;
        error = presto_kml_last_recno(fset);
        if ( error ) {
                EXIT;
                fset->fset_kml.fd_file = NULL;
                filp_close(f, NULL);
                printk("presto: IO error in KML of fset %sn", 
                       fset->fset_name);
        }
        fset->fset_lento_off = fset->fset_kml.fd_offset;
        fset->fset_lento_recno = fset->fset_kml.fd_recno;
        EXIT;
        return error;
}
int presto_init_last_rcvd_file(struct presto_file_set *fset)
{
        int error = 0;
        struct file *f;
        ENTRY;
        if (fset->fset_last_rcvd) {
                CDEBUG(D_INODE, "fset already has last_rcvd openn");
                EXIT;
                return 0;
        }
        f = presto_log_open(fset, "last_rcvd", O_RDWR | O_CREAT);
        if ( IS_ERR(f) ) {
                error = PTR_ERR(f);
                return error;
        }
        fset->fset_last_rcvd = f;
        EXIT;
        return error;
}
int presto_init_lml_file(struct presto_file_set *fset)
{
        int error = 0;
        struct file *f;
        ENTRY;
        if (fset->fset_lml.fd_file) {
                CDEBUG(D_INODE, "fset already has lml openn");
                EXIT;
                return 0;
        }
        fset->fset_lml.fd_lock = RW_LOCK_UNLOCKED;
        INIT_LIST_HEAD(&fset->fset_lml.fd_reservations); 
        f = presto_log_open(fset, "lml", O_RDWR | O_CREAT);
        if ( IS_ERR(f) ) {
                error = PTR_ERR(f);
                return error;
        }
        fset->fset_lml.fd_file = f;
        fset->fset_lml.fd_offset = 
                fset->fset_lml.fd_file->f_dentry->d_inode->i_size;
        EXIT;
        return error;
}
/* Write the last_rcvd values to the last)_rcvd file */
int presto_write_last_rcvd(struct rec_info *recinfo,
                           struct presto_file_set *fset,
                           struct lento_vfs_context *info)
{
        int ret;
        loff_t off = info->slot_offset;
        struct {
                __u32 remote_recno;
                __u64 remote_offset;
                __u32 local_recno;
                __u64 local_offset;
        } rcvd_rec;
        rcvd_rec.remote_recno = cpu_to_le32(info->recno);
        rcvd_rec.remote_offset = cpu_to_le64(info->kml_offset);
        rcvd_rec.local_recno = cpu_to_le32(recinfo->recno);
        rcvd_rec.local_offset = cpu_to_le64(recinfo->offset + recinfo->size);
        ret = presto_fwrite(fset->fset_last_rcvd, (char *)(&rcvd_rec),
                            sizeof(rcvd_rec), &off);
        if (ret == sizeof(rcvd_rec))
                ret = 0;
        return ret;
}
/* LML records here */
/* this writes the LML records for close, in conjunction with the KML  */
int presto_write_lml_close(struct rec_info *rec,
                           struct presto_file_set *fset, 
                           struct file *file,
                           __u64 remote_ino,
                           __u32 remote_generation,
                           __u32 remote_version,
                           struct presto_version *new_file_ver)
{
        int opcode = PRESTO_OP_CLOSE;
        char *buffer;
        struct dentry *dentry = file->f_dentry; 
        __u64 ino;
        __u32 pathlen;
        char *path;
        __u32 generation;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
          EXIT;
          return 0;
        }
        root = fset->fset_mtpt;
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        CDEBUG(D_INODE, "Path: %sn", path);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        ino = cpu_to_le64(dentry->d_inode->i_ino);
        generation = cpu_to_le32(dentry->d_inode->i_generation);
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + sizeof(*new_file_ver) +
                sizeof(ino) + sizeof(generation) + sizeof(pathlen) +
                sizeof(remote_ino) + sizeof(remote_generation) + 
                sizeof(remote_version) + sizeof(rec->offset) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 0;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, new_file_ver, sizeof(*new_file_ver));
        logrecord = logit(logrecord, &ino, sizeof(ino));
        logrecord = logit(logrecord, &generation, sizeof(generation));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = logit(logrecord, &remote_ino, sizeof(remote_ino));
        logrecord = logit(logrecord, &remote_generation,
                          sizeof(remote_generation));
        logrecord = logit(logrecord, &remote_version, sizeof(remote_version));
        logrecord = logit(logrecord, &rec->offset, sizeof(rec->offset));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_journal_write(struct rec_info *rec,
                         struct presto_file_set *fset, 
                         struct file *file)
{
        struct presto_version file_version;
        int rc;
        ENTRY;
        presto_getversion(&file_version, file->f_dentry->d_inode); 
        /* append this record */
        rc = presto_write_lml_close
                (rec, 
                 fset, 
                 file,
                 0, /* remote_ino */
                 0, /* remote_generation */
                 0, /* remote_version */
                 &file_version);
        EXIT;
        return rc;
}
/* 
 * Check if the given record is at the end of the file. If it is, truncate
 * the lml to the record's offset, removing it. Repeat on prior record,
 * until we reach an active record or a reserved record (as defined by the
 * reservations list).
 */
static int presto_truncate_lml_tail(struct presto_file_set *fset)
{
        loff_t lml_tail;
        loff_t lml_last_rec;
        loff_t lml_last_recsize;
        loff_t local_offset;
        int recno;
        struct journal_prefix prefix;
        struct inode *inode = fset->fset_lml.fd_file->f_dentry->d_inode;
        void *handle;
        int rc;
        ENTRY;
        /* If someone else is already truncating the LML, return. */
        write_lock(&fset->fset_lml.fd_lock); 
        if (fset->fset_lml.fd_truncating == 1 ) {
                write_unlock(&fset->fset_lml.fd_lock); 
                EXIT;
                return 0;
        }
        /* someone is about to write to the end of the LML */ 
        if ( !list_empty(&fset->fset_lml.fd_reservations) ) {
                write_unlock(&fset->fset_lml.fd_lock); 
                EXIT;
                return 0;
        }
       lml_tail = fset->fset_lml.fd_file->f_dentry->d_inode->i_size;
       /* Nothing to truncate?*/
       if (lml_tail == 0) {
                write_unlock(&fset->fset_lml.fd_lock); 
                EXIT;
                return 0;
       }
       fset->fset_lml.fd_truncating = 1;
       write_unlock(&fset->fset_lml.fd_lock); 
       presto_last_record(&fset->fset_lml, &lml_last_recsize,
                          &lml_last_rec, &recno, lml_tail);
       /* Do we have a record to check? If not we have zeroes at the
          beginning of the file. -SHP
       */
       if (lml_last_recsize != 0) {
       		local_offset = lml_last_rec - lml_last_recsize;
       		rc = presto_fread(fset->fset_lml.fd_file, (char *)&prefix,  
                          		sizeof(prefix), &local_offset); 
        	if (rc != sizeof(prefix)) {
                	EXIT;
                	goto tr_out;
        	}
       
        	if ( prefix.opcode != PRESTO_OP_NOOP ) {
                	EXIT;
                	rc = 0;
                        /* We may have zeroes at the end of the file, should
			   we clear them out? -SHP
                        */
                	goto tr_out;
        	}
	} else 
	 	lml_last_rec=0;
        handle = presto_trans_start(fset, inode, PRESTO_OP_TRUNC);
        if ( !handle ) {
                EXIT;
                rc = -ENOMEM;
                goto tr_out;
        }
        rc = presto_do_truncate(fset, fset->fset_lml.fd_file->f_dentry, 
                                lml_last_rec - lml_last_recsize, lml_tail);
        presto_trans_commit(fset, handle); 
        if ( rc == 0 ) {
                rc = 1;
        }
        EXIT;
 tr_out:
        CDEBUG(D_JOURNAL, "rc = %dn", rc);
        write_lock(&fset->fset_lml.fd_lock);
        fset->fset_lml.fd_truncating = 0;
        write_unlock(&fset->fset_lml.fd_lock);
        return rc;
}
int presto_truncate_lml(struct presto_file_set *fset)
{
        int rc; 
        ENTRY;
        
        while ( (rc = presto_truncate_lml_tail(fset)) > 0);
        if ( rc < 0 && rc != -EALREADY) {
                printk("truncate_lml error %dn", rc); 
        }
        EXIT;
        return rc;
}
int presto_clear_lml_close(struct presto_file_set *fset, 
                           loff_t  lml_offset)
{
        int rc;
        struct journal_prefix record;
        loff_t offset = lml_offset;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        CDEBUG(D_JOURNAL, "reading prefix: off %ld, size %Zdn", 
               (long)lml_offset, sizeof(record));
        rc = presto_fread(fset->fset_lml.fd_file, (char *)&record,
                          sizeof(record), &offset);
        if ( rc != sizeof(record) ) {
                printk("presto: clear_lml io error %dn", rc); 
                EXIT;
                return -EIO;
        }
        /* overwrite the prefix */ 
        CDEBUG(D_JOURNAL, "overwriting prefix: off %ldn", (long)lml_offset);
        record.opcode = PRESTO_OP_NOOP;
        offset = lml_offset;
        /* note: this does just a single transaction in the cache */
        rc = presto_fwrite(fset->fset_lml.fd_file, (char *)(&record), 
                              sizeof(record), &offset);
        if ( rc != sizeof(record) ) {
                EXIT;
                return -EIO;
        }
        EXIT;
        return 0; 
}
/* now a journal function for every operation */
int presto_journal_setattr(struct rec_info *rec, 
                           struct presto_file_set *fset, 
                           struct dentry *dentry,
                           struct presto_version *old_ver, struct iattr *iattr)
{
        int opcode = PRESTO_OP_SETATTR;
        char *buffer;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        __u32 uid, gid, mode, valid, flags;
        __u64 fsize, mtime, ctime;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        if (!dentry->d_inode || (dentry->d_inode->i_nlink == 0) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + sizeof(*old_ver) +
                sizeof(valid) + sizeof(mode) + sizeof(uid) + sizeof(gid) +
                sizeof(fsize) + sizeof(mtime) + sizeof(ctime) + sizeof(flags) +
                sizeof(pathlen) + sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        /* Only journal one kind of mtime, and not atime at all.  Also don't
         * journal bogus data in iattr, to make the journal more compressible.
         */
        if (iattr->ia_valid & ATTR_MTIME_SET)
                iattr->ia_valid = iattr->ia_valid | ATTR_MTIME;
        valid = cpu_to_le32(iattr->ia_valid & ~(ATTR_ATIME | ATTR_MTIME_SET |
                                                ATTR_ATIME_SET));
        mode = iattr->ia_valid & ATTR_MODE ? cpu_to_le32(iattr->ia_mode): 0;
        uid = iattr->ia_valid & ATTR_UID ? cpu_to_le32(iattr->ia_uid): 0;
        gid = iattr->ia_valid & ATTR_GID ? cpu_to_le32(iattr->ia_gid): 0;
        fsize = iattr->ia_valid & ATTR_SIZE ? cpu_to_le64(iattr->ia_size): 0;
        mtime = iattr->ia_valid & ATTR_MTIME ? cpu_to_le64(iattr->ia_mtime): 0;
        ctime = iattr->ia_valid & ATTR_CTIME ? cpu_to_le64(iattr->ia_ctime): 0;
        flags = iattr->ia_valid & ATTR_ATTR_FLAG ?
                cpu_to_le32(iattr->ia_attr_flags): 0;
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, old_ver, sizeof(*old_ver));
        logrecord = logit(logrecord, &valid, sizeof(valid));
        logrecord = logit(logrecord, &mode, sizeof(mode));
        logrecord = logit(logrecord, &uid, sizeof(uid));
        logrecord = logit(logrecord, &gid, sizeof(gid));
        logrecord = logit(logrecord, &fsize, sizeof(fsize));
        logrecord = logit(logrecord, &mtime, sizeof(mtime));
        logrecord = logit(logrecord, &ctime, sizeof(ctime));
        logrecord = logit(logrecord, &flags, sizeof(flags));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_journal_create(struct rec_info *rec, struct presto_file_set *fset,
                          struct dentry *dentry,
                          struct presto_version *tgt_dir_ver,
                          struct presto_version *new_file_ver, int mode)
{
        int opcode = PRESTO_OP_CREATE;
        char *buffer;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        __u32 uid, gid, lmode;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        uid = cpu_to_le32(dentry->d_inode->i_uid);
        gid = cpu_to_le32(dentry->d_inode->i_gid);
        lmode = cpu_to_le32(mode);
 
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(lmode) + sizeof(uid) + sizeof(gid) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dentry->d_parent);
        logrecord = logit(logrecord, new_file_ver, sizeof(*new_file_ver));
        logrecord = logit(logrecord, &lmode, sizeof(lmode));
        logrecord = logit(logrecord, &uid, sizeof(uid));
        logrecord = logit(logrecord, &gid, sizeof(gid));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_journal_symlink(struct rec_info *rec, struct presto_file_set *fset, struct dentry *dentry,
                           const char *target,
                           struct presto_version *tgt_dir_ver,
                           struct presto_version *new_link_ver)
{
        int opcode = PRESTO_OP_SYMLINK;
        char *buffer;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        __u32 targetlen = cpu_to_le32(strlen(target));
        struct dentry *root;
        __u32 uid, gid;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        uid = cpu_to_le32(dentry->d_inode->i_uid);
        gid = cpu_to_le32(dentry->d_inode->i_gid);
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(uid) + sizeof(gid) + sizeof(pathlen) +
                sizeof(targetlen) + sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen)) +
                size_round(le32_to_cpu(targetlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dentry->d_parent);
        logrecord = logit(logrecord, new_link_ver, sizeof(*new_link_ver));
        logrecord = logit(logrecord, &uid, sizeof(uid));
        logrecord = logit(logrecord, &gid, sizeof(gid));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = logit(logrecord, &targetlen, sizeof(targetlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           target, size_round(le32_to_cpu(targetlen)),
                           NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_journal_mkdir(struct rec_info *rec, struct presto_file_set *fset, struct dentry *dentry,
                         struct presto_version *tgt_dir_ver,
                         struct presto_version *new_dir_ver, int mode)
{
        int opcode = PRESTO_OP_MKDIR;
        char *buffer;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        __u32 uid, gid, lmode;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        uid = cpu_to_le32(dentry->d_inode->i_uid);
        gid = cpu_to_le32(dentry->d_inode->i_gid);
        lmode = cpu_to_le32(mode);
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size = sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(lmode) + sizeof(uid) + sizeof(gid) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dentry->d_parent);
        logrecord = logit(logrecord, new_dir_ver, sizeof(*new_dir_ver));
        logrecord = logit(logrecord, &lmode, sizeof(lmode));
        logrecord = logit(logrecord, &uid, sizeof(uid));
        logrecord = logit(logrecord, &gid, sizeof(gid));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int
presto_journal_rmdir(struct rec_info *rec, struct presto_file_set *fset,
                     struct dentry *dir, struct presto_version *tgt_dir_ver,
                     struct presto_version *old_dir_ver, int len,
                     const char *name)
{
        int opcode = PRESTO_OP_RMDIR;
        char *buffer;
        char *path;
        __u32 pathlen, llen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        llen = cpu_to_le32(len);
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dir, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(pathlen) + sizeof(llen) + sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        CDEBUG(D_JOURNAL, "path: %s (%d), name: %s (%d), size %dn",
               path, pathlen, name, len, size);
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen)) + 
                size_round(len);
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dir);
        logrecord = logit(logrecord, old_dir_ver, sizeof(*old_dir_ver));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = logit(logrecord, &llen, sizeof(llen));
        logrecord = journal_log_suffix(logrecord, record, fset, dir, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           name, size_round(len),
                           NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int
presto_journal_mknod(struct rec_info *rec, struct presto_file_set *fset,
                     struct dentry *dentry, struct presto_version *tgt_dir_ver,
                     struct presto_version *new_node_ver, int mode,
                     int dmajor, int dminor )
{
        int opcode = PRESTO_OP_MKNOD;
        char *buffer;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        __u32 uid, gid, lmode, lmajor, lminor;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        uid = cpu_to_le32(dentry->d_inode->i_uid);
        gid = cpu_to_le32(dentry->d_inode->i_gid);
        lmode = cpu_to_le32(mode);
        lmajor = cpu_to_le32(dmajor);
        lminor = cpu_to_le32(dminor);
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size = sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(lmode) + sizeof(uid) + sizeof(gid) + sizeof(lmajor) +
                sizeof(lminor) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dentry->d_parent);
        logrecord = logit(logrecord, new_node_ver, sizeof(*new_node_ver));
        logrecord = logit(logrecord, &lmode, sizeof(lmode));
        logrecord = logit(logrecord, &uid, sizeof(uid));
        logrecord = logit(logrecord, &gid, sizeof(gid));
        logrecord = logit(logrecord, &lmajor, sizeof(lmajor));
        logrecord = logit(logrecord, &lminor, sizeof(lminor));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int
presto_journal_link(struct rec_info *rec, struct presto_file_set *fset,
                    struct dentry *src, struct dentry *tgt,
                    struct presto_version *tgt_dir_ver,
                    struct presto_version *new_link_ver)
{
        int opcode = PRESTO_OP_LINK;
        char *buffer, *srcbuffer;
        char *path, *srcpath;
        __u32 pathlen, srcpathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        BUFF_ALLOC(srcbuffer, NULL);
        srcpath = presto_path(src, root, srcbuffer, PAGE_SIZE);
        srcpathlen = cpu_to_le32(MYPATHLEN(srcbuffer, srcpath));
        BUFF_ALLOC(buffer, srcbuffer);
        path = presto_path(tgt, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(srcpathlen) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen)) + 
                size_round(le32_to_cpu(srcpathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, tgt->d_parent);
        logrecord = logit(logrecord, new_link_ver, sizeof(*new_link_ver));
        logrecord = logit(logrecord, &srcpathlen, sizeof(srcpathlen));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, tgt, rec);
        error = presto_log(fset, rec, record, size,
                           srcpath, size_round(le32_to_cpu(srcpathlen)),
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0);
        BUFF_FREE(srcbuffer);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_journal_rename(struct rec_info *rec, struct presto_file_set *fset, struct dentry *src,
                          struct dentry *tgt,
                          struct presto_version *src_dir_ver,
                          struct presto_version *tgt_dir_ver)
{
        int opcode = PRESTO_OP_RENAME;
        char *buffer, *srcbuffer;
        char *path, *srcpath;
        __u32 pathlen, srcpathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        BUFF_ALLOC(srcbuffer, NULL);
        srcpath = presto_path(src, root, srcbuffer, PAGE_SIZE);
        srcpathlen = cpu_to_le32(MYPATHLEN(srcbuffer, srcpath));
        BUFF_ALLOC(buffer, srcbuffer);
        path = presto_path(tgt, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 4 * sizeof(*src_dir_ver) +
                sizeof(srcpathlen) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen)) + 
                size_round(le32_to_cpu(srcpathlen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, src_dir_ver, sizeof(*src_dir_ver));
        logrecord = log_version(logrecord, src->d_parent);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, tgt->d_parent);
        logrecord = logit(logrecord, &srcpathlen, sizeof(srcpathlen));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, tgt, rec);
        error = presto_log(fset, rec, record, size,
                           srcpath, size_round(le32_to_cpu(srcpathlen)),
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0);
        BUFF_FREE(buffer);
        BUFF_FREE(srcbuffer);
        EXIT;
        return error;
}
int presto_journal_unlink(struct rec_info *rec, struct presto_file_set *fset, struct dentry *dir,
                          struct presto_version *tgt_dir_ver,
                          struct presto_version *old_file_ver, int len,
                          const char *name)
{
        int opcode = PRESTO_OP_UNLINK;
        char *buffer;
        char *path;
        __u32 pathlen, llen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        llen = cpu_to_le32(len);
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dir, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 3 * sizeof(*tgt_dir_ver) +
                sizeof(pathlen) + sizeof(llen) + sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen)) + size_round(len);
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, tgt_dir_ver, sizeof(*tgt_dir_ver));
        logrecord = log_version(logrecord, dir);
        logrecord = logit(logrecord, old_file_ver, sizeof(*old_file_ver));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = logit(logrecord, &llen, sizeof(llen));
        logrecord = journal_log_suffix(logrecord, record, fset, dir, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           name, size_round(len), 
                           NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int
presto_journal_close(struct rec_info *rec, struct presto_file_set *fset,
                     struct file *file, struct dentry *dentry,
		     struct presto_version *new_file_ver)
{
        int opcode = PRESTO_OP_CLOSE;
        struct presto_file_data *fd;
        char *buffer;
        char *path;
        __u64 ino;
        __u32 pathlen;
        __u32 generation;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        __u32 open_fsuid;
        __u32 open_fsgid;
        __u32 open_ngroups;
        __u32 open_groups[NGROUPS_MAX];
        __u32 open_mode;
        __u32 open_uid;
        __u32 open_gid;
        int i;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        if (!dentry->d_inode || (dentry->d_inode->i_nlink == 0) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        fd = (struct presto_file_data *)file->private_data;
        if (fd) {
                open_ngroups = fd->fd_ngroups;
                for (i = 0; i < fd->fd_ngroups; i++)
			open_groups[i] = (__u32) fd->fd_groups[i];
                open_mode = fd->fd_mode;
                open_uid = fd->fd_uid;
                open_gid = fd->fd_gid;
                open_fsuid = fd->fd_fsuid;
                open_fsgid = fd->fd_fsgid;
        } else {
                open_ngroups = current->ngroups;
                for (i=0; i<current->ngroups; i++)
			open_groups[i] =  (__u32) current->groups[i]; 
                open_mode = dentry->d_inode->i_mode;
                open_uid = dentry->d_inode->i_uid;
                open_gid = dentry->d_inode->i_gid;
                open_fsuid = current->fsuid;
                open_fsgid = current->fsgid;
        }
        BUFF_ALLOC(buffer, NULL);
        path = presto_path(dentry, root, buffer, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(buffer, path));
        ino = cpu_to_le64(dentry->d_inode->i_ino);
        generation = cpu_to_le32(dentry->d_inode->i_generation);
        size =  sizeof(__u32) * open_ngroups +
                sizeof(open_mode) + sizeof(open_uid) + sizeof(open_gid) +
                sizeof(struct journal_prefix) + sizeof(*new_file_ver) +
                sizeof(ino) + sizeof(generation) + sizeof(pathlen) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix_with_groups_and_ids(
                record, opcode, rec, open_ngroups, open_groups,
                open_fsuid, open_fsgid);
        logrecord = logit(logrecord, &open_mode, sizeof(open_mode));
        logrecord = logit(logrecord, &open_uid, sizeof(open_uid));
        logrecord = logit(logrecord, &open_gid, sizeof(open_gid));
        logrecord = logit(logrecord, new_file_ver, sizeof(*new_file_ver));
        logrecord = logit(logrecord, &ino, sizeof(ino));
        logrecord = logit(logrecord, &generation, sizeof(generation));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        BUFF_FREE(buffer);
        EXIT;
        return error;
}
int presto_rewrite_close(struct rec_info *rec, struct presto_file_set *fset, 
                         char *path, __u32 pathlen, 
                         int ngroups, __u32 *groups, 
                         __u64 ino,     __u32 generation, 
                         struct presto_version *new_file_ver)
{
        int opcode = PRESTO_OP_CLOSE;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        size =  sizeof(__u32) * ngroups + 
                sizeof(struct journal_prefix) + sizeof(*new_file_ver) +
                sizeof(ino) + sizeof(generation) + 
                sizeof(le32_to_cpu(pathlen)) +
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        rec->size = size + size_round(le32_to_cpu(pathlen));
        logrecord = journal_log_prefix_with_groups(record, opcode, rec,
                                                   ngroups, groups);
        logrecord = logit(logrecord, new_file_ver, sizeof(*new_file_ver));
        logrecord = logit(logrecord, &ino, sizeof(ino));
        logrecord = logit(logrecord, &generation, sizeof(generation));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = journal_log_suffix(logrecord, record, fset, NULL, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           NULL, 0, NULL, 0);
        EXIT;
        return error;
}
/* write closes for the local close records in the LML */ 
int presto_complete_lml(struct presto_file_set *fset)
{
        __u32 groups[NGROUPS_MAX];
        loff_t lml_offset;
        loff_t read_offset; 
        char *buffer;
        void *handle;
        struct rec_info rec;
        struct close_rec { 
                struct presto_version new_file_ver;
                __u64 ino;
                __u32 generation;
                __u32 pathlen;
                __u64 remote_ino;
                __u32 remote_generation;
                __u32 remote_version;
                __u64 lml_offset;
        } close_rec; 
        struct file *file = fset->fset_lml.fd_file;
        struct journal_prefix prefix;
        int rc = 0;
        ENTRY;
        lml_offset = 0; 
 again: 
        if (lml_offset >= file->f_dentry->d_inode->i_size) {
                EXIT;
                return rc;
        }
        read_offset = lml_offset;
        rc = presto_fread(file, (char *)&prefix,
                          sizeof(prefix), &read_offset);
        if ( rc != sizeof(prefix) ) {
                EXIT;
                printk("presto_complete_lml: ioerror - 1, tell Petern");
                return -EIO;
        }
        if ( prefix.opcode == PRESTO_OP_NOOP ) {
                lml_offset += prefix.len; 
                goto again; 
        }
        rc = presto_fread(file, (char *)groups, 
                          prefix.ngroups * sizeof(__u32), &read_offset); 
        if ( rc != prefix.ngroups * sizeof(__u32) ) {
                EXIT;
                printk("presto_complete_lml: ioerror - 2, tell Petern");
                return -EIO;
        }
        rc = presto_fread(file, (char *)&close_rec, 
                          sizeof(close_rec), &read_offset); 
        if ( rc != sizeof(close_rec) ) {
                EXIT;
                printk("presto_complete_lml: ioerror - 3, tell Petern");
                return -EIO;
        }
        /* is this a backfetch or a close record? */ 
        if ( le64_to_cpu(close_rec.remote_ino) != 0 ) { 
                lml_offset += prefix.len;
                goto again; 
        }
        BUFF_ALLOC(buffer, NULL);
        rc = presto_fread(file, (char *)buffer, 
                          le32_to_cpu(close_rec.pathlen), &read_offset); 
        if ( rc != le32_to_cpu(close_rec.pathlen) ) {
                EXIT;
                printk("presto_complete_lml: ioerror - 4, tell Petern");
                return -EIO;
        }
        
        handle = presto_trans_start(fset, file->f_dentry->d_inode, 
                                    PRESTO_OP_RELEASE);
        if ( !handle ) {
                EXIT;
                return -ENOMEM; 
        }
        rc = presto_clear_lml_close(fset, lml_offset); 
        if ( rc ) {
                printk("error during clearing: %dn", rc);
                presto_trans_commit(fset, handle);
                EXIT; 
                return rc; 
        }
        rc = presto_rewrite_close(&rec, fset, buffer, close_rec.pathlen, 
                                  prefix.ngroups, groups, 
                                  close_rec.ino, close_rec.generation,
                                  &close_rec.new_file_ver); 
        if ( rc ) {
                printk("error during rewrite close: %dn", rc);
                presto_trans_commit(fset, handle);
                EXIT; 
                return rc; 
        }
        presto_trans_commit(fset, handle); 
        if ( rc ) { 
                printk("error during truncation: %dn", rc);
                EXIT; 
                return rc;
        }
        
        lml_offset += prefix.len; 
        CDEBUG(D_JOURNAL, "next LML record at: %ldn", (long)lml_offset);
        goto again;
        EXIT;
        return -EINVAL;
}
#ifdef CONFIG_FS_EXT_ATTR
/* Journal an ea operation. A NULL buffer implies the attribute is 
 * getting deleted. In this case we simply change the opcode, but nothing
 * else is affected.
 */
int presto_journal_set_ext_attr (struct rec_info *rec, 
                                 struct presto_file_set *fset, 
                                 struct dentry *dentry, 
                                 struct presto_version *ver, const char *name, 
                                 const char *buffer, int buffer_len, 
                                 int flags) 
{ 
        int opcode = (buffer == NULL) ? 
                     PRESTO_OP_DELEXTATTR : 
                     PRESTO_OP_SETEXTATTR ;
        char *temp;
        char *path;
        __u32 pathlen;
        int size;
        char *logrecord;
        char record[292];
        struct dentry *root;
        int error;
        __u32 namelen=cpu_to_le32(strnlen(name,PRESTO_EXT_ATTR_NAME_MAX));
        __u32 buflen=(buffer != NULL)? cpu_to_le32(buffer_len): cpu_to_le32(0);
        __u32 mode;
        ENTRY;
        if ( presto_no_journal(fset) ) {
                EXIT;
                return 0;
        }
        if (!dentry->d_inode || (dentry->d_inode->i_nlink == 0) ) {
                EXIT;
                return 0;
        }
        root = fset->fset_mtpt;
        BUFF_ALLOC(temp, NULL);
        path = presto_path(dentry, root, temp, PAGE_SIZE);
        pathlen = cpu_to_le32(MYPATHLEN(temp, path));
        flags=cpu_to_le32(flags);
        /* Ugly, but needed. posix ACLs change the mode without using
         * setattr, we need to record these changes. The EA code per se
         * is not really affected.
         */
        mode=cpu_to_le32(dentry->d_inode->i_mode);
        size =  sizeof(__u32) * current->ngroups + 
                sizeof(struct journal_prefix) + 
                2 * sizeof(struct presto_version) +
                sizeof(flags) + sizeof(mode) + sizeof(namelen) + 
                sizeof(buflen) + sizeof(pathlen) + 
                sizeof(struct journal_suffix);
        if ( size > sizeof(record) ) {
                printk("PRESTO: BUFFER OVERFLOW in %s!n", __FUNCTION__);
        }
        rec->is_kml = 1;
        /* Make space for a path, a attr name and value*/
        /* We use the buflen instead of buffer_len to make sure that we 
         * journal the right length. This may be a little paranoid, but
         * with 64 bits round the corner, I would rather be safe than sorry!
         * Also this handles deletes with non-zero buffer_lengths correctly.
         * SHP
         */
        rec->size = size + size_round(le32_to_cpu(pathlen)) +
                    size_round(le32_to_cpu(namelen)) + 
                    size_round(le32_to_cpu(buflen));
        logrecord = journal_log_prefix(record, opcode, rec);
        logrecord = logit(logrecord, ver, sizeof(*ver));
        logrecord = log_version(logrecord, dentry);
        logrecord = logit(logrecord, &flags, sizeof(flags));
        logrecord = logit(logrecord, &mode, sizeof(flags));
        logrecord = logit(logrecord, &pathlen, sizeof(pathlen));
        logrecord = logit(logrecord, &namelen, sizeof(namelen));
        logrecord = logit(logrecord, &buflen, sizeof(buflen));
        logrecord = journal_log_suffix(logrecord, record, fset, dentry, rec);
        error = presto_log(fset, rec, record, size,
                           path, size_round(le32_to_cpu(pathlen)),
                           name, size_round(le32_to_cpu(namelen)),
                           buffer, size_round(le32_to_cpu(buflen)));
        BUFF_FREE(temp);
        EXIT;
        return error;
}
#endif

						