presto.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:33k
- /*
- * intermezzo.c
- *
- * This file implements basic routines supporting the semantics
- *
- * Author: Peter J. Braam <braam@cs.cmu.edu>
- * Copyright (C) 1998 Stelias Computing Inc
- * Copyright (C) 1999 Red Hat Inc.
- *
- */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/fs.h>
- #include <linux/stat.h>
- #include <linux/errno.h>
- #include <linux/vmalloc.h>
- #include <linux/slab.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>
- extern int presto_init_last_rcvd_file(struct presto_file_set *);
- extern int presto_init_lml_file(struct presto_file_set *);
- extern int presto_init_kml_file(struct presto_file_set *);
- int presto_walk(const char *name, struct nameidata *nd)
- {
- int err;
- /* we do not follow symlinks to support symlink operations
- correctly. The vfs should always hand us resolved dentries
- so we should not be required to use LOOKUP_FOLLOW. At the
- reintegrating end, lento again should be working with the
- resolved pathname and not the symlink. SHP
- XXX: This code implies that direct symlinks do not work. SHP
- */
- unsigned int flags = LOOKUP_POSITIVE;
- ENTRY;
- err = 0;
- if (path_init(name, flags, nd))
- err = path_walk(name, nd);
- return err;
- }
- static inline int presto_dentry_is_fsetroot(struct dentry *dentry)
- {
- return ((long) dentry->d_fsdata) & PRESTO_FSETROOT;
- }
- static inline struct presto_file_set *presto_dentry2fset(struct dentry *dentry)
- {
- return (struct presto_file_set *)
- (((long) dentry->d_fsdata) - PRESTO_FSETROOT);
- }
- /* find the presto minor device for this inode */
- int presto_i2m(struct inode *inode)
- {
- struct presto_cache *cache;
- ENTRY;
- cache = presto_get_cache(inode);
- CDEBUG(D_PSDEV, "n");
- if ( !cache ) {
- printk("PRESTO: BAD: cannot find cache for dev %d, ino %ldn",
- inode->i_dev, inode->i_ino);
- EXIT;
- return -1;
- }
- EXIT;
- return cache->cache_psdev->uc_minor;
- }
- inline int presto_f2m(struct presto_file_set *fset)
- {
- return fset->fset_cache->cache_psdev->uc_minor;
- }
- inline int presto_c2m(struct presto_cache *cache)
- {
- return cache->cache_psdev->uc_minor;
- }
- int presto_has_all_data(struct inode *inode)
- {
- ENTRY;
- if ( (inode->i_size >> inode->i_sb->s_blocksize_bits) >
- inode->i_blocks) {
- EXIT;
- return 0;
- }
- EXIT;
- return 1;
- }
- /* find the fileset dentry for this dentry */
- struct presto_file_set *presto_fset(struct dentry *de)
- {
- struct dentry *fsde;
- ENTRY;
- fsde = de;
- for ( ; ; ) {
- if ( presto_dentry_is_fsetroot(fsde) ) {
- EXIT;
- return presto_dentry2fset(fsde);
- }
- /* are we at the cache "/" ?? */
- if ( fsde->d_parent == fsde ) {
- if ( !de->d_inode ) {
- printk("Warning %*s has no fileset inode.n",
- de->d_name.len, de->d_name.name);
- }
- /* better to return a BAD thing */
- EXIT;
- return NULL;
- }
- fsde = fsde->d_parent;
- }
- /* not reached */
- EXIT;
- return NULL;
- }
- /* XXX check this out */
- struct presto_file_set *presto_path2fileset(const char *name)
- {
- struct nameidata nd;
- struct presto_file_set *fileset;
- int error;
- ENTRY;
- error = presto_walk(name, &nd);
- if (!error) {
- #if 0
- error = do_revalidate(nd.dentry);
- #endif
- if (!error)
- fileset = presto_fset(nd.dentry);
- path_release(&nd);
- EXIT;
- } else
- fileset = ERR_PTR(error);
- EXIT;
- return fileset;
- }
- /* check a flag on this dentry or fset root. Semantics:
- - most flags: test if it is set
- - PRESTO_ATTR, PRESTO_DATA return 1 if PRESTO_FSETINSYNC is set
- */
- int presto_chk(struct dentry *dentry, int flag)
- {
- int minor;
- struct presto_file_set *fset = presto_fset(dentry);
- ENTRY;
- minor = presto_i2m(dentry->d_inode);
- if ( upc_comms[minor].uc_no_filter ) {
- EXIT;
- return ~0;
- }
- /* if the fileset is in sync DATA and ATTR are OK */
- if ( fset &&
- (flag == PRESTO_ATTR || flag == PRESTO_DATA) &&
- (fset->fset_flags & FSET_INSYNC) ) {
- CDEBUG(D_INODE, "fset in sync (ino %ld)!n",
- fset->fset_mtpt->d_inode->i_ino);
- EXIT;
- return 1;
- }
- /* if it is a fsetroot, it's stored in the fset_flags */
- if ( fset && presto_dentry_is_fsetroot(dentry) ) {
- EXIT;
- return fset->fset_data & flag;
- }
- EXIT;
- return ((int)(long)dentry->d_fsdata & flag);
- }
- /* set a bit in the dentry flags */
- void presto_set(struct dentry *dentry, int flag)
- {
- if ( dentry->d_inode ) {
- CDEBUG(D_INODE, "SET ino %ld, flag %xn",
- dentry->d_inode->i_ino, flag);
- }
- if ( presto_dentry_is_fsetroot(dentry)) {
- struct presto_file_set *fset = presto_dentry2fset(dentry);
- if (fset) {
- fset->fset_data |= flag;
- CDEBUG(D_INODE, "Setting fset->fset_data: now %xn",
- fset->fset_data);
- }
- } else {
- CDEBUG(D_INODE, "Setting dentry->d_fsdatan");
- ((int)(long)dentry->d_fsdata) |= flag;
- }
- }
- /* given a path: complete the closes on the fset */
- int lento_complete_closes(char *path)
- {
- struct nameidata nd;
- struct dentry *dentry;
- int error;
- struct presto_file_set *fset;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto out_complete;
- }
-
- fset = presto_fset(dentry);
- error = -EINVAL;
- if ( !fset ) {
- printk("No fileset!n");
- EXIT;
- goto out_complete;
- }
-
- /* transactions and locking are internal to this function */
- error = presto_complete_lml(fset);
-
- EXIT;
- out_complete:
- path_release(&nd);
- return error;
- }
- /* set the fset recno and offset to a given value */
- int lento_reset_fset(char *path, __u64 offset, __u32 recno)
- {
- struct nameidata nd;
- struct dentry *dentry;
- int error;
- struct presto_file_set *fset;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error)
- return error;
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto out_complete;
- }
-
- fset = presto_fset(dentry);
- error = -EINVAL;
- if ( !fset ) {
- printk("No fileset!n");
- EXIT;
- goto out_complete;
- }
- write_lock(&fset->fset_kml.fd_lock);
- fset->fset_kml.fd_recno = recno;
- fset->fset_kml.fd_offset = offset;
- read_lock(&fset->fset_kml.fd_lock);
-
- EXIT;
- out_complete:
- path_release(&nd);
- return error;
- }
- /* given a path, write an LML record for it - thus must have root's
- group array settings, since lento is doing this
- */
- int lento_write_lml(char *path,
- __u64 remote_ino,
- __u32 remote_generation,
- __u32 remote_version,
- struct presto_version *remote_file_version)
- {
- struct nameidata nd;
- struct rec_info rec;
- struct dentry *dentry;
- struct file file;
- int error;
- struct presto_file_set *fset;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- file.f_dentry = dentry;
- file.private_data = NULL;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto out_lml;
- }
-
- fset = presto_fset(dentry);
- error = -EINVAL;
- if ( !fset ) {
- printk("No fileset!n");
- EXIT;
- goto out_lml;
- }
-
- /* setting offset to -1 appends */
- rec.offset = -1;
- /* this only requires a transaction below which is automatic */
- error = presto_write_lml_close(&rec,
- fset,
- &file,
- remote_ino,
- remote_generation,
- remote_version,
- remote_file_version);
-
- EXIT;
- out_lml:
- path_release(&nd);
- return error;
- }
- /* given a path: write a close record and cancel an LML record, finally
- call truncate LML. Lento is doing this so it goes in with uid/gid's
- root.
- */
- int lento_cancel_lml(char *path,
- __u64 lml_offset,
- __u64 remote_ino,
- __u32 remote_generation,
- __u32 remote_version,
- struct lento_vfs_context *info)
- {
- struct nameidata nd;
- struct rec_info rec;
- struct dentry *dentry;
- int error;
- struct presto_file_set *fset;
- void *handle;
- struct presto_version new_ver;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto out_cancel_lml;
- }
-
- fset = presto_fset(dentry);
- error=-EINVAL;
- if (fset==NULL) {
- printk("No fileset!n");
- EXIT;
- goto out_cancel_lml;
- }
-
- /* this only requires a transaction below which is automatic */
- handle = presto_trans_start(fset, dentry->d_inode, PRESTO_OP_RELEASE);
- if ( !handle ) {
- error = -ENOMEM;
- EXIT;
- goto out_cancel_lml;
- }
-
- if (info->flags & LENTO_FL_CANCEL_LML) {
- error = presto_clear_lml_close(fset, lml_offset);
- if ( error ) {
- presto_trans_commit(fset, handle);
- EXIT;
- goto out_cancel_lml;
- }
- }
- if (info->flags & LENTO_FL_WRITE_KML) {
- struct file file;
- file.private_data = NULL;
- file.f_dentry = dentry;
- presto_getversion(&new_ver, dentry->d_inode);
- error = presto_journal_close(&rec, fset, &file, dentry,
- &new_ver);
- if ( error ) {
- EXIT;
- presto_trans_commit(fset, handle);
- goto out_cancel_lml;
- }
- }
- if (info->flags & LENTO_FL_WRITE_EXPECT) {
- error = presto_write_last_rcvd(&rec, fset, info);
- if ( error ) {
- EXIT;
- presto_trans_commit(fset, handle);
- goto out_cancel_lml;
- }
- }
- presto_trans_commit(fset, handle);
- if (info->flags & LENTO_FL_CANCEL_LML) {
- presto_truncate_lml(fset);
- }
-
- out_cancel_lml:
- EXIT;
- path_release(&nd);
- return error;
- }
- /* given a path, operate on the flags in its dentry. Used by downcalls */
- int presto_mark_dentry(const char *name, int and_flag, int or_flag,
- int *res)
- {
- struct nameidata nd;
- struct dentry *dentry;
- int error;
- CDEBUG(D_INODE, "name: %s, and flag %x, or flag %xn",
- name, and_flag, or_flag);
- error = presto_walk(name, &nd);
- if (error)
- return error;
- dentry = nd.dentry;
- CDEBUG(D_INODE, "dentry at %p, d_fsdata %pn", dentry, dentry->d_fsdata);
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) )
- goto out;
- error = 0;
- if ( presto_dentry_is_fsetroot(dentry) ) {
- struct presto_file_set *fset = presto_dentry2fset(dentry);
- CDEBUG(D_INODE, "Setting fset fset_data: fset %pn", fset);
- if ( fset ) {
- fset->fset_data &= and_flag;
- fset->fset_data |= or_flag;
- if (res) {
- *res = fset->fset_data;
- }
- }
- CDEBUG(D_INODE, "fset %p, flags %x data %xn",
- fset, fset->fset_flags, fset->fset_data);
- } else {
- ((int)(long)dentry->d_fsdata) &= and_flag;
- ((int)(long)dentry->d_fsdata) |= or_flag;
- if (res)
- *res = (int)(long)dentry->d_fsdata;
- }
- /* indicate if we were the only users while changing the flag */
- if ( atomic_read(&dentry->d_count) > 1 )
- error = -EBUSY;
- out:
- path_release(&nd);
- return error;
- }
- /* given a path, operate on the flags in its cache. Used by mark_ioctl */
- int presto_mark_cache(const char *name, int and_flag, int or_flag,
- int *res)
- {
- struct nameidata nd;
- struct dentry *dentry;
- struct presto_cache *cache;
- int error;
- CDEBUG(D_INODE,
- "presto_mark_cache :: name: %s, and flag %x, or flag %xn",
- name, and_flag, or_flag);
- error = presto_walk(name, &nd);
- if (error)
- return error;
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) )
- goto out;
- error = -EBADF;
- cache = presto_get_cache(dentry->d_inode);
- if ( !cache ) {
- printk("PRESTO: BAD: cannot find cache in presto_mark_cachen");
- make_bad_inode(dentry->d_inode);
- goto out;
- }
- error = 0;
- ((int)cache->cache_flags) &= and_flag;
- ((int)cache->cache_flags) |= or_flag;
- if (res) {
- *res = (int)cache->cache_flags;
- }
- out:
- path_release(&nd);
- return error;
- }
- int presto_mark_fset_dentry(struct dentry *dentry, int and_flag, int or_flag,
- int * res)
- {
- int error;
- struct presto_file_set *fset;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) )
- return error;
- error = -EBADF;
- fset = presto_fset(dentry);
- if ( !fset ) {
- printk("PRESTO: BAD: cannot find cache in presto_mark_cachen");
- make_bad_inode(dentry->d_inode);
- return error;
- }
- error = 0;
- ((int)fset->fset_flags) &= and_flag;
- ((int)fset->fset_flags) |= or_flag;
- if (res) {
- *res = (int)fset->fset_flags;
- }
- return error;
- }
- /* given a path, operate on the flags in its cache. Used by mark_ioctl */
- inline int presto_mark_fset(const char *name, int and_flag, int or_flag,
- int * res)
- {
- struct nameidata nd;
- struct dentry *dentry;
- int error;
- ENTRY;
- error = presto_walk(name, &nd);
- if (error)
- return error;
- dentry = nd.dentry;
- error = presto_mark_fset_dentry(dentry, and_flag, or_flag, res);
- path_release(&nd);
- return error;
- }
- /* talk to Lento about the permit */
- static int presto_permit_upcall(struct dentry *dentry)
- {
- int rc;
- char *path, *buffer;
- int pathlen;
- int minor;
- int fsetnamelen;
- struct presto_file_set *fset = NULL;
- if ( (minor = presto_i2m(dentry->d_inode)) < 0)
- return -EINVAL;
- fset = presto_fset(dentry);
- if (!fset) {
- EXIT;
- return -ENOTCONN;
- }
-
- if ( !presto_lento_up(minor) ) {
- if ( fset->fset_flags & FSET_STEAL_PERMIT ) {
- return 0;
- } else {
- return -ENOTCONN;
- }
- }
- PRESTO_ALLOC(buffer, char *, PAGE_SIZE);
- if ( !buffer ) {
- printk("PRESTO: out of memory!n");
- return -ENOMEM;
- }
- path = presto_path(dentry, fset->fset_mtpt, buffer, PAGE_SIZE);
- pathlen = MYPATHLEN(buffer, path);
- fsetnamelen = strlen(fset->fset_name);
- rc = lento_permit(minor, pathlen, fsetnamelen, path, fset->fset_name);
- PRESTO_FREE(buffer, PAGE_SIZE);
- return rc;
- }
- /* get a write permit for the fileset of this inode
- * - if this returns a negative value there was an error
- * - if 0 is returned the permit was already in the kernel -- or --
- * Lento gave us the permit without reintegration
- * - lento returns the number of records it reintegrated
- */
- int presto_get_permit(struct inode * inode)
- {
- struct dentry *de;
- struct presto_file_set *fset;
- int minor = presto_i2m(inode);
- int rc;
- ENTRY;
- if (minor < 0) {
- EXIT;
- return -1;
- }
- if ( ISLENTO(minor) ) {
- EXIT;
- return -EINVAL;
- }
- if (list_empty(&inode->i_dentry)) {
- printk("No alias for inode %dn", (int) inode->i_ino);
- EXIT;
- return -EINVAL;
- }
- de = list_entry(inode->i_dentry.next, struct dentry, d_alias);
- fset = presto_fset(de);
- if ( !fset ) {
- printk("Presto: no fileset in presto_get_permit!n");
- EXIT;
- return -EINVAL;
- }
- if (fset->fset_flags & FSET_HASPERMIT) {
- lock_kernel();
- fset->fset_permit_count++;
- CDEBUG(D_INODE, "permit count now %d, inode %lxn",
- fset->fset_permit_count, inode->i_ino);
- unlock_kernel();
- EXIT;
- return 0;
- } else {
- /* Allow reintegration to proceed without locks -SHP */
- rc = presto_permit_upcall(fset->fset_mtpt);
- lock_kernel();
- if ( !rc ) {
- presto_mark_fset_dentry
- (fset->fset_mtpt, ~0, FSET_HASPERMIT, NULL);
- fset->fset_permit_count++;
- }
- CDEBUG(D_INODE, "permit count now %d, ino %lx (likely 1), rc %dn",
- fset->fset_permit_count, inode->i_ino, rc);
- unlock_kernel();
- EXIT;
- return rc;
- }
- }
- int presto_put_permit(struct inode * inode)
- {
- struct dentry *de;
- struct presto_file_set *fset;
- int minor = presto_i2m(inode);
- ENTRY;
- if (minor < 0) {
- EXIT;
- return -1;
- }
- if ( ISLENTO(minor) ) {
- EXIT;
- return -1;
- }
- if (list_empty(&inode->i_dentry)) {
- printk("No alias for inode %dn", (int) inode->i_ino);
- EXIT;
- return -1;
- }
- de = list_entry(inode->i_dentry.next, struct dentry, d_alias);
- fset = presto_fset(de);
- if ( !fset ) {
- printk("Presto: no fileset in presto_get_permit!n");
- EXIT;
- return -1;
- }
- lock_kernel();
- if (fset->fset_flags & FSET_HASPERMIT) {
- if (fset->fset_permit_count > 0) fset->fset_permit_count--;
- else printk("Put permit while permit count is 0, inode %lx!n",
- inode->i_ino);
- } else {
- fset->fset_permit_count=0;
- printk("Put permit while no permit, inode %lx, flags %x!n",
- inode->i_ino, fset->fset_flags);
- }
- CDEBUG(D_INODE, "permit count now %d, inode %lxn",
- fset->fset_permit_count, inode->i_ino);
- if (fset->fset_flags & FSET_PERMIT_WAITING &&
- fset->fset_permit_count == 0) {
- CDEBUG(D_INODE, "permit count now 0, ino %lx, notify Lenton",
- inode->i_ino);
- presto_mark_fset_dentry(fset->fset_mtpt, ~FSET_PERMIT_WAITING, 0, NULL);
- presto_mark_fset_dentry(fset->fset_mtpt, ~FSET_HASPERMIT, 0, NULL);
- lento_release_permit(fset->fset_cache->cache_psdev->uc_minor,
- fset->fset_permit_cookie);
- fset->fset_permit_cookie = 0;
- }
- unlock_kernel();
- EXIT;
- return 0;
- }
- void presto_getversion(struct presto_version * presto_version,
- struct inode * inode)
- {
- presto_version->pv_mtime = cpu_to_le64((__u64)inode->i_mtime);
- presto_version->pv_ctime = cpu_to_le64((__u64)inode->i_ctime);
- presto_version->pv_size = cpu_to_le64((__u64)inode->i_size);
- }
- /*
- * note: this routine "pins" a dentry for a fileset root
- */
- int presto_set_fsetroot(char *path, char *fsetname, unsigned int fsetid,
- unsigned int flags)
- {
- struct presto_file_set *fset;
- struct presto_file_set *fset2;
- struct dentry *dentry;
- struct presto_cache *cache;
- int error;
- ENTRY;
- PRESTO_ALLOC(fset, struct presto_file_set *, sizeof(*fset));
- error = -ENOMEM;
- if ( !fset ) {
- printk(KERN_ERR "No memory allocating fset for %sn", fsetname);
- EXIT;
- return -ENOMEM;
- }
- CDEBUG(D_INODE, "fset at %pn", fset);
- printk("presto: fsetroot: path %s, fileset name %sn", path, fsetname);
- error = presto_walk(path, &fset->fset_nd);
- CDEBUG(D_INODE, "n");
- if (error) {
- EXIT;
- goto out_free;
- }
- dentry = fset->fset_nd.dentry;
- CDEBUG(D_INODE, "n");
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto out_dput;
- }
- CDEBUG(D_INODE, "n");
- cache = presto_get_cache(dentry->d_inode);
- if (!cache) {
- printk(KERN_ERR "No cache found for %sn", path);
- EXIT;
- goto out_dput;
- }
- CDEBUG(D_INODE, "n");
- error = -EINVAL;
- if ( !cache->cache_mtpt) {
- printk(KERN_ERR "Presto - no mountpoint: fsetroot fails!n");
- EXIT;
- goto out_dput;
- }
- CDEBUG(D_INODE, "n");
- if (!cache->cache_root_fileset) {
- printk(KERN_ERR "Presto - no file set: fsetroot fails!n");
- EXIT;
- goto out_dput;
- }
- error = -EEXIST;
- CDEBUG(D_INODE, "n");
- fset2 = presto_fset(dentry);
- if (fset2 && (fset2->fset_mtpt == dentry) ) {
- printk(KERN_ERR "Fsetroot already set (path %s)n", path);
- EXIT;
- goto out_dput;
- }
- fset->fset_cache = cache;
- fset->fset_mtpt = dentry;
- fset->fset_name = fsetname;
- fset->fset_chunkbits = CHUNK_BITS;
- fset->fset_flags = flags;
- fset->fset_file_maxio = FSET_DEFAULT_MAX_FILEIO;
- dentry->d_fsdata = (void *) ( ((long)fset) + PRESTO_FSETROOT );
- list_add(&fset->fset_list, &cache->cache_fset_list);
- error = presto_init_kml_file(fset);
- if ( error ) {
- EXIT;
- CDEBUG(D_JOURNAL, "Error init_kml %dn", error);
- goto out_list_del;
- }
- error = presto_init_last_rcvd_file(fset);
- if ( error ) {
- int rc;
- EXIT;
- rc = presto_close_journal_file(fset);
- CDEBUG(D_JOURNAL, "Error init_lastrcvd %d, cleanup %dn", error, rc);
- goto out_list_del;
- }
- error = presto_init_lml_file(fset);
- if ( error ) {
- int rc;
- EXIT;
- rc = presto_close_journal_file(fset);
- CDEBUG(D_JOURNAL, "Error init_lml %d, cleanup %dn", error, rc);
- goto out_list_del;
- }
- #ifdef CONFIG_KREINT
- /* initialize kml reint buffer */
- error = kml_init (fset);
- if ( error ) {
- int rc;
- EXIT;
- rc = presto_close_journal_file(fset);
- CDEBUG(D_JOURNAL, "Error init kml reint %d, cleanup %dn",
- error, rc);
- goto out_list_del;
- }
- #endif
- if ( dentry->d_inode == dentry->d_inode->i_sb->s_root->d_inode) {
- cache->cache_flags |= CACHE_FSETROOT_SET;
- }
- CDEBUG(D_PIOCTL, "-------> fset at %p, dentry at %p, mtpt %p, fset %s, cache %p, d_fsdata %pn",
- fset, dentry, fset->fset_mtpt, fset->fset_name, cache, dentry->d_fsdata);
- EXIT;
- return 0;
- out_list_del:
- list_del(&fset->fset_list);
- dentry->d_fsdata = 0;
- out_dput:
- path_release(&fset->fset_nd);
- out_free:
- PRESTO_FREE(fset, sizeof(*fset));
- return error;
- }
- int presto_get_kmlsize(char *path, size_t *size)
- {
- struct nameidata nd;
- struct presto_file_set *fset;
- struct dentry *dentry;
- int error;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto kml_out;
- }
- error = -EINVAL;
- if ( ! presto_dentry_is_fsetroot(dentry)) {
- EXIT;
- goto kml_out;
- }
- fset = presto_dentry2fset(dentry);
- if (!fset) {
- EXIT;
- goto kml_out;
- }
- error = 0;
- *size = fset->fset_kml.fd_offset;
- kml_out:
- path_release(&nd);
- return error;
- }
- int presto_clear_fsetroot(char *path)
- {
- struct nameidata nd;
- struct presto_file_set *fset;
- struct dentry *dentry;
- struct presto_cache *cache;
- int error;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto put_out;
- }
- error = -EINVAL;
- if ( ! presto_dentry_is_fsetroot(dentry)) {
- EXIT;
- goto put_out;
- }
- fset = presto_dentry2fset(dentry);
- if (!fset) {
- EXIT;
- goto put_out;
- }
- #ifdef CONFIG_KREINT
- error = kml_cleanup (fset);
- if ( error ) {
- printk("InterMezzo: Closing kml for fset %s: %dn",
- fset->fset_name, error);
- }
- #endif
- error = presto_close_journal_file(fset);
- if ( error ) {
- printk("InterMezzo: Closing journal for fset %s: %dn",
- fset->fset_name, error);
- }
- cache = fset->fset_cache;
- cache->cache_flags &= ~CACHE_FSETROOT_SET;
- list_del(&fset->fset_list);
- dentry->d_fsdata = 0;
- path_release(&fset->fset_nd);
- fset->fset_mtpt = NULL;
- PRESTO_FREE(fset->fset_name, strlen(fset->fset_name) + 1);
- PRESTO_FREE(fset, sizeof(*fset));
- EXIT;
- put_out:
- path_release(&nd); /* for our lookup */
- return error;
- }
- int presto_clear_all_fsetroots(char *path)
- {
- struct nameidata nd;
- struct presto_file_set *fset;
- struct dentry *dentry;
- struct presto_cache *cache;
- int error;
- struct list_head *tmp,*tmpnext;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto put_out;
- }
- error = -EINVAL;
- if ( ! presto_dentry_is_fsetroot(dentry)) {
- EXIT;
- goto put_out;
- }
- fset = presto_dentry2fset(dentry);
- if (!fset) {
- EXIT;
- goto put_out;
- }
- cache = fset->fset_cache;
- cache = fset->fset_cache;
- cache->cache_flags &= ~CACHE_FSETROOT_SET;
- tmp = &cache->cache_fset_list;
- tmpnext = tmp->next;
- while ( tmpnext != &cache->cache_fset_list) {
- tmp=tmpnext;
- tmpnext=tmp->next;
- fset = list_entry(tmp, struct presto_file_set, fset_list);
-
- error = presto_close_journal_file(fset);
- if ( error ) {
- printk("InterMezzo: Closing journal for fset %s: %dn",
- fset->fset_name, error);
- }
- list_del(&fset->fset_list);
- fset->fset_mtpt->d_fsdata = 0;
- path_release(&fset->fset_nd);
- fset->fset_mtpt = NULL;
- PRESTO_FREE(fset->fset_name, strlen(fset->fset_name) +1);
- PRESTO_FREE(fset, sizeof(*fset));
- }
- EXIT;
- put_out:
- path_release(&nd); /* for our lookup */
- return error;
- }
- int presto_get_lastrecno(char *path, off_t *recno)
- {
- struct nameidata nd;
- struct presto_file_set *fset;
- struct dentry *dentry;
- int error;
- ENTRY;
- error = presto_walk(path, &nd);
- if (error) {
- EXIT;
- return error;
- }
- dentry = nd.dentry;
- error = -ENXIO;
- if ( !presto_ispresto(dentry->d_inode) ) {
- EXIT;
- goto kml_out;
- }
- error = -EINVAL;
- if ( ! presto_dentry_is_fsetroot(dentry)) {
- EXIT;
- goto kml_out;
- }
- fset = presto_dentry2fset(dentry);
- if (!fset) {
- EXIT;
- goto kml_out;
- }
- error = 0;
- *recno = fset->fset_kml.fd_recno;
- kml_out:
- path_release(&nd);
- return error;
- }
- /*
- if *cookie != 0, lento must wait for this cookie
- before releasing the permit, operations are in progress.
- */
- int presto_permit_downcall( const char * path, int *cookie )
- {
- int result;
- struct presto_file_set *fset;
- fset = presto_path2fileset(path);
- if (IS_ERR(fset)) {
- EXIT;
- return PTR_ERR(fset);
- }
- lock_kernel();
- if (fset->fset_permit_count != 0) {
- /* is there are previous cookie? */
- if (fset->fset_permit_cookie == 0) {
- CDEBUG(D_CACHE, "presto installing cookie 0x%x, %sn",
- *cookie, path);
- fset->fset_permit_cookie = *cookie;
- } else {
- *cookie = fset->fset_permit_cookie;
- CDEBUG(D_CACHE, "presto has cookie 0x%x, %sn",
- *cookie, path);
- }
- result = presto_mark_fset(path, 0, FSET_PERMIT_WAITING, NULL);
- } else {
- *cookie = 0;
- CDEBUG(D_CACHE, "presto releasing permit %sn", path);
- result = presto_mark_fset(path, ~FSET_HASPERMIT, 0, NULL);
- }
- unlock_kernel();
- return result;
- }
- inline int presto_is_read_only(struct presto_file_set * fset)
- {
- int minor, mask;
- struct presto_cache *cache = fset->fset_cache;
- minor= cache->cache_psdev->uc_minor;
- mask= (ISLENTO(minor)? FSET_LENTO_RO : FSET_CLIENT_RO);
- if ( fset->fset_flags & mask )
- return 1;
- mask= (ISLENTO(minor)? CACHE_LENTO_RO : CACHE_CLIENT_RO);
- return ((cache->cache_flags & mask)? 1 : 0);
- }