litmus-rt.git - The LITMUS^RT kernel.

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author	Benny Halevy <bhalevy@panasas.com>	2009-04-01 09:22:29 -0400
committer	Benny Halevy <bhalevy@panasas.com>	2009-06-17 15:23:57 -0400
commit	99fe60d062cfecf382c036065b3278b82b6c5eff (patch)
tree	b4451fc4bb42c0915c4f736cc5fdae9e818b55d4 /include/linux/nfs4.h
parent	938e10109115a71cc69d475122f21cf75e5046cd (diff)

nfs41: exchange_id operation

Implement the exchange_id operation conforming to http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26 Unlike NFSv4.0, NFSv4.1 requires machine credentials. RPC_AUTH_GSS machine credentials will be passed into the kernel at mount time to be available for the exchange_id operation. RPC_AUTH_UNIX root mounts can use the UNIX root credential. Store the root credential in the nfs_client struct. Without a credential, NFSv4.1 state renewal fails. [nfs41: establish clientid via exchange id only if cred != NULL] Signed-off-by: Andy Adamson<andros@umich.edu> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: move nfstime4 from under CONFIG_NFS_V4_1] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfs41: do not wait a lease time in exchange id] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfs41: pass *session in seq_args and seq_res] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> [nfs41: Ignoring impid in decode_exchange_id is missing a READ_BUF] Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfs41: fix Xcode_exchange_id's xdr Xcoding pointer type] [nfs41: get rid of unused struct nfs41_exchange_id_res members] Signed-off-by: Benny Halevy <bhalevy@panasas.com>

Diffstat (limited to 'include/linux/nfs4.h')

-rw-r--r--

include/linux/nfs4.h

1 files changed, 1 insertions, 0 deletions


diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index 7c36fcf2dfb7..ad65709ed8d3 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h
@@ -21,6 +21,7 @@
21	#define NFS4_FHSIZE 128	21	#define NFS4_FHSIZE 128
22	#define NFS4_MAXPATHLEN PATH_MAX	22	#define NFS4_MAXPATHLEN PATH_MAX
23	#define NFS4_MAXNAMLEN NAME_MAX	23	#define NFS4_MAXNAMLEN NAME_MAX
		24	#define NFS4_OPAQUE_LIMIT 1024
24	#define NFS4_MAX_SESSIONID_LEN 16	25	#define NFS4_MAX_SESSIONID_LEN 16
25		26
26	#define NFS4_ACCESS_READ 0x0001	27	#define NFS4_ACCESS_READ 0x0001

/* * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 * * bitmap_create - sets up the bitmap structure * bitmap_destroy - destroys the bitmap structure * * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: * - added disk storage for bitmap * - changes to allow various bitmap chunk sizes * - added bitmap daemon (to asynchronously clear bitmap bits from disk) */ /* * Still to do: * * flush after percent set rather than just time based. (maybe both). * wait if count gets too high, wake when it drops to half. * allow bitmap to be mirrored with superblock (before or after...) * allow hot-add to re-instate a current device. * allow hot-add of bitmap after quiessing device */ #include <linux/module.h> #include <linux/version.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/config.h> #include <linux/timer.h> #include <linux/sched.h> #include <linux/list.h> #include <linux/file.h> #include <linux/mount.h> #include <linux/buffer_head.h> #include <linux/raid/md.h> #include <linux/raid/bitmap.h> /* debug macros */ #define DEBUG 0 #if DEBUG /* these are for debugging purposes only! */ /* define one and only one of these */ #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ #define INJECT_FAULTS_4 0 /* undef */ #define INJECT_FAULTS_5 0 /* undef */ #define INJECT_FAULTS_6 0 /* if these are defined, the driver will fail! debug only */ #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ #define INJECT_FATAL_FAULT_2 0 /* undef */ #define INJECT_FATAL_FAULT_3 0 /* undef */ #endif //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */ #define DPRINTK(x...) do { } while(0) #ifndef PRINTK # if DEBUG > 0 # define PRINTK(x...) printk(KERN_DEBUG x) # else # define PRINTK(x...) # endif #endif static inline char * bmname(struct bitmap *bitmap) { return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; } /* * test if the bitmap is active */ int bitmap_active(struct bitmap *bitmap) { unsigned long flags; int res = 0; if (!bitmap) return res; spin_lock_irqsave(&bitmap->lock, flags); res = bitmap->flags & BITMAP_ACTIVE; spin_unlock_irqrestore(&bitmap->lock, flags); return res; } #define WRITE_POOL_SIZE 256 /* mempool for queueing pending writes on the bitmap file */ static void *write_pool_alloc(unsigned int gfp_flags, void *data) { return kmalloc(sizeof(struct page_list), gfp_flags); } static void write_pool_free(void *ptr, void *data) { kfree(ptr); } /* * just a placeholder - calls kmalloc for bitmap pages */ static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) { unsigned char *page; #ifdef INJECT_FAULTS_1 page = NULL; #else page = kmalloc(PAGE_SIZE, GFP_NOIO); #endif if (!page) printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); else PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", bmname(bitmap), page); return page; } /* * for now just a placeholder -- just calls kfree for bitmap pages */ static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) { PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); kfree(page); } /* * check a page and, if necessary, allocate it (or hijack it if the alloc fails) * * 1) check to see if this page is allocated, if it's not then try to alloc * 2) if the alloc fails, set the page's hijacked flag so we'll use the * page pointer directly as a counter * * if we find our page, we increment the page's refcount so that it stays * allocated while we're using it */ static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int create) { unsigned char *mappage; if (page >= bitmap->pages) { printk(KERN_ALERT "%s: invalid bitmap page request: %lu (> %lu)\n", bmname(bitmap), page, bitmap->pages-1); return -EINVAL; } if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ return 0; if (bitmap->bp[page].map) /* page is already allocated, just return */ return 0; if (!create) return -ENOENT; spin_unlock_irq(&bitmap->lock); /* this page has not been allocated yet */ if ((mappage = bitmap_alloc_page(bitmap)) == NULL) { PRINTK("%s: bitmap map page allocation failed, hijacking\n", bmname(bitmap)); /* failed - set the hijacked flag so that we can use the * pointer as a counter */ spin_lock_irq(&bitmap->lock); if (!bitmap->bp[page].map) bitmap->bp[page].hijacked = 1; goto out; } /* got a page */ spin_lock_irq(&bitmap->lock); /* recheck the page */ if (bitmap->bp[page].map || bitmap->bp[page].hijacked) { /* somebody beat us to getting the page */ bitmap_free_page(bitmap, mappage); return 0; } /* no page was in place and we have one, so install it */ memset(mappage, 0, PAGE_SIZE); bitmap->bp[page].map = mappage; bitmap->missing_pages--; out: return 0; } /* if page is completely empty, put it back on the free list, or dealloc it */ /* if page was hijacked, unmark the flag so it might get alloced next time */ /* Note: lock should be held when calling this */ static inline void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) { char *ptr; if (bitmap->bp[page].count) /* page is still busy */ return; /* page is no longer in use, it can be released */ if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ bitmap->bp[page].hijacked = 0; bitmap->bp[page].map = NULL; return; } /* normal case, free the page */ #if 0 /* actually ... let's not. We will probably need the page again exactly when * memory is tight and we are flusing to disk */ return; #else ptr = bitmap->bp[page].map; bitmap->bp[page].map = NULL; bitmap->missing_pages++; bitmap_free_page(bitmap, ptr); return; #endif } /* * bitmap file handling - read and write the bitmap file and its superblock */ /* copy the pathname of a file to a buffer */ char *file_path(struct file *file, char *buf, int count) { struct dentry *d; struct vfsmount *v; if (!buf) return NULL; d = file->f_dentry; v = file->f_vfsmnt; buf = d_path(d, v, buf, count); return IS_ERR(buf) ? NULL : buf; } /* * basic page I/O operations */ /* IO operations when bitmap is stored near all superblocks */ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) { /* choose a good rdev and read the page from there */ mdk_rdev_t *rdev; struct list_head *tmp; struct page *page = alloc_page(GFP_KERNEL); sector_t target; if (!page) return ERR_PTR(-ENOMEM); ITERATE_RDEV(mddev, rdev, tmp) { if (! rdev->in_sync || rdev->faulty) continue; target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) { page->index = index; return page; } } return ERR_PTR(-EIO); } static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait) { mdk_rdev_t *rdev; struct list_head *tmp; ITERATE_RDEV(mddev, rdev, tmp) if (rdev->in_sync && !rdev->faulty) md_super_write(mddev, rdev, (rdev->sb_offset<<1) + offset + page->index * (PAGE_SIZE/512), PAGE_SIZE, page); if (wait) wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); return 0; } /* * write out a page to a file */ static int write_page(struct bitmap *bitmap, struct page *page, int wait) { int ret = -ENOMEM; if (bitmap->file == NULL) return write_sb_page(bitmap->mddev, bitmap->offset, page, wait); if (wait) lock_page(page); else { if (TestSetPageLocked(page)) return -EAGAIN; /* already locked */ if (PageWriteback(page)) { unlock_page(page); return -EAGAIN; } } ret = page->mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE); if (!ret) ret = page->mapping->a_ops->commit_write(NULL, page, 0, PAGE_SIZE); if (ret) { unlock_page(page); return ret; } set_page_dirty(page); /* force it to be written out */ if (!wait) { /* add to list to be waited for by daemon */ struct page_list *item = mempool_alloc(bitmap->write_pool, GFP_NOIO); item->page = page; page_cache_get(page); spin_lock(&bitmap->write_lock); list_add(&item->list, &bitmap->complete_pages); spin_unlock(&bitmap->write_lock); md_wakeup_thread(bitmap->writeback_daemon); } return write_one_page(page, wait); } /* read a page from a file, pinning it into cache, and return bytes_read */ static struct page *read_page(struct file *file, unsigned long index, unsigned long *bytes_read) { struct inode *inode = file->f_mapping->host; struct page *page = NULL; loff_t isize = i_size_read(inode); unsigned long end_index = isize >> PAGE_CACHE_SHIFT; PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_CACHE_SIZE, (unsigned long long)index << PAGE_CACHE_SHIFT); page = read_cache_page(inode->i_mapping, index, (filler_t *)inode->i_mapping->a_ops->readpage, file); if (IS_ERR(page)) goto out; wait_on_page_locked(page); if (!PageUptodate(page) || PageError(page)) { page_cache_release(page); page = ERR_PTR(-EIO); goto out; } if (index > end_index) /* we have read beyond EOF */ *bytes_read = 0; else if (index == end_index) /* possible short read */ *bytes_read = isize & ~PAGE_CACHE_MASK; else *bytes_read = PAGE_CACHE_SIZE; /* got a full page */ out: if (IS_ERR(page)) printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", (int)PAGE_CACHE_SIZE, (unsigned long long)index << PAGE_CACHE_SHIFT, PTR_ERR(page)); return page; } /* * bitmap file superblock operations */ /* update the event counter and sync the superblock to disk */ int bitmap_update_sb(struct bitmap *bitmap) { bitmap_super_t *sb; unsigned long flags; if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ return 0; spin_lock_irqsave(&bitmap->lock, flags); if (!bitmap->sb_page) { /* no superblock */ spin_unlock_irqrestore(&bitmap->lock, flags); return 0; } spin_unlock_irqrestore(&bitmap->lock, flags); sb = (bitmap_super_t *)kmap(bitmap->sb_page); sb->events = cpu_to_le64(bitmap->mddev->events); if (!bitmap->mddev->degraded) sb->events_cleared = cpu_to_le64(bitmap->mddev->events); kunmap(bitmap->sb_page); return write_page(bitmap, bitmap->sb_page, 1); } /* print out the bitmap file superblock */ void bitmap_print_sb(struct bitmap *bitmap) { bitmap_super_t *sb; if (!bitmap || !bitmap->sb_page) return; sb = (bitmap_super_t *)kmap(bitmap->sb_page); printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", *(__u32 *)(sb->uuid+0), *(__u32 *)(sb->uuid+4), *(__u32 *)(sb->uuid+8), *(__u32 *)(sb->uuid+12)); printk(KERN_DEBUG " events: %llu\n", (unsigned long long) le64_to_cpu(sb->events)); printk(KERN_DEBUG "events cleared: %llu\n", (unsigned long long) le64_to_cpu(sb->events_cleared)); printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); printk(KERN_DEBUG " sync size: %llu KB\n", (unsigned long long)le64_to_cpu(sb->sync_size)/2); printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); kunmap(bitmap->sb_page); } /* read the superblock from the bitmap file and initialize some bitmap fields */ static int bitmap_read_sb(struct bitmap *bitmap) { char *reason = NULL; bitmap_super_t *sb; unsigned long chunksize, daemon_sleep, write_behind; unsigned long bytes_read; unsigned long long events; int err = -EINVAL; /* page 0 is the superblock, read it... */ if (bitmap->file) bitmap->sb_page = read_page(bitmap->file, 0, &bytes_read); else { bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); bytes_read = PAGE_SIZE; } if (IS_ERR(bitmap->sb_page)) { err = PTR_ERR(bitmap->sb_page); bitmap->sb_page = NULL; return err; } sb = (bitmap_super_t *)kmap(bitmap->sb_page); if (bytes_read < sizeof(*sb)) { /* short read */ printk(KERN_INFO "%s: bitmap file superblock truncated\n", bmname(bitmap)); err = -ENOSPC; goto out; } chunksize = le32_to_cpu(sb->chunksize); daemon_sleep = le32_to_cpu(sb->daemon_sleep); write_behind = le32_to_cpu(sb->write_behind); /* verify that the bitmap-specific fields are valid */ if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) reason = "bad magic"; else if (sb->version != cpu_to_le32(BITMAP_MAJOR)) reason = "unrecognized superblock version"; else if (chunksize < 512 || chunksize > (1024 * 1024 * 4)) reason = "bitmap chunksize out of range (512B - 4MB)"; else if ((1 << ffz(~chunksize)) != chunksize) reason = "bitmap chunksize not a power of 2"; else if (daemon_sleep < 1 || daemon_sleep > 15) reason = "daemon sleep period out of range (1-15s)"; else if (write_behind > COUNTER_MAX) reason = "write-behind limit out of range (0 - 16383)"; if (reason) { printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", bmname(bitmap), reason); goto out; } /* keep the array size field of the bitmap superblock up to date */ sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); if (!bitmap->mddev->persistent) goto success; /* * if we have a persistent array superblock, compare the * bitmap's UUID and event counter to the mddev's */ if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", bmname(bitmap)); goto out; } events = le64_to_cpu(sb->events); if (events < bitmap->mddev->events) { printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " "-- forcing full recovery\n", bmname(bitmap), events, (unsigned long long) bitmap->mddev->events); sb->state |= BITMAP_STALE; } success: /* assign fields using values from superblock */ bitmap->chunksize = chunksize; bitmap->daemon_sleep = daemon_sleep; bitmap->daemon_lastrun = jiffies; bitmap->max_write_behind = write_behind; bitmap->flags |= sb->state; bitmap->events_cleared = le64_to_cpu(sb->events_cleared); if (sb->state & BITMAP_STALE) bitmap->events_cleared = bitmap->mddev->events; err = 0; out: kunmap(bitmap->sb_page); if (err) bitmap_print_sb(bitmap); return err; } enum bitmap_mask_op { MASK_SET, MASK_UNSET }; /* record the state of the bitmap in the superblock */ static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, enum bitmap_mask_op op) { bitmap_super_t *sb; unsigned long flags; spin_lock_irqsave(&bitmap->lock, flags); if (!bitmap || !bitmap->sb_page) { /* can't set the state */ spin_unlock_irqrestore(&bitmap->lock, flags); return; } page_cache_get(bitmap->sb_page); spin_unlock_irqrestore(&bitmap->lock, flags); sb = (bitmap_super_t *)kmap(bitmap->sb_page); switch (op) { case MASK_SET: sb->state |= bits; break; case MASK_UNSET: sb->state &= ~bits; break; default: BUG(); } kunmap(bitmap->sb_page); page_cache_release(bitmap->sb_page); } /* * general bitmap file operations */ /* calculate the index of the page that contains this bit */ static inline unsigned long file_page_index(unsigned long chunk) { return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; } /* calculate the (bit) offset of this bit within a page */ static inline unsigned long file_page_offset(unsigned long chunk) { return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); } /* * return a pointer to the page in the filemap that contains the given bit * * this lookup is complicated by the fact that the bitmap sb might be exactly * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page * 0 or page 1 */ static inline struct page *filemap_get_page(struct bitmap *bitmap, unsigned long chunk) { return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; } static void bitmap_file_unmap(struct bitmap *bitmap) { struct page **map, *sb_page; unsigned long *attr; int pages; unsigned long flags; spin_lock_irqsave(&bitmap->lock, flags); map = bitmap->filemap; bitmap->filemap = NULL; attr = bitmap->filemap_attr; bitmap->filemap_attr = NULL; pages = bitmap->file_pages; bitmap->file_pages = 0; sb_page = bitmap->sb_page; bitmap->sb_page = NULL; spin_unlock_irqrestore(&bitmap->lock, flags); while (pages--) if (map[pages]->index != 0) /* 0 is sb_page, release it below */ page_cache_release(map[pages]); kfree(map); kfree(attr); if (sb_page) page_cache_release(sb_page); } static void bitmap_stop_daemons(struct bitmap *bitmap); /* dequeue the next item in a page list -- don't call from irq context */ static struct page_list *dequeue_page(struct bitmap *bitmap) { struct page_list *item = NULL; struct list_head *head = &bitmap->complete_pages; spin_lock(&bitmap->write_lock); if (list_empty(head)) goto out; item = list_entry(head->prev, struct page_list, list); list_del(head->prev); out: spin_unlock(&bitmap->write_lock); return item; } static void drain_write_queues(struct bitmap *bitmap) { struct page_list *item; while ((item = dequeue_page(bitmap))) { /* don't bother to wait */ page_cache_release(item->page); mempool_free(item, bitmap->write_pool); } wake_up(&bitmap->write_wait); } static void bitmap_file_put(struct bitmap *bitmap) { struct file *file; struct inode *inode; unsigned long flags; spin_lock_irqsave(&bitmap->lock, flags); file = bitmap->file; bitmap->file = NULL; spin_unlock_irqrestore(&bitmap->lock, flags); bitmap_stop_daemons(bitmap); drain_write_queues(bitmap); bitmap_file_unmap(bitmap); if (file) { inode = file->f_mapping->host; spin_lock(&inode->i_lock); atomic_set(&inode->i_writecount, 1); /* allow writes again */ spin_unlock(&inode->i_lock); fput(file); } } /* * bitmap_file_kick - if an error occurs while manipulating the bitmap file * then it is no longer reliable, so we stop using it and we mark the file * as failed in the superblock */ static void bitmap_file_kick(struct bitmap *bitmap) { char *path, *ptr = NULL; bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET); bitmap_update_sb(bitmap); if (bitmap->file) { path = kmalloc(PAGE_SIZE, GFP_KERNEL); if (path) ptr = file_path(bitmap->file, path, PAGE_SIZE); printk(KERN_ALERT "%s: kicking failed bitmap file %s from array!\n", bmname(bitmap), ptr ? ptr : ""); kfree(path); } bitmap_file_put(bitmap); return; } enum bitmap_page_attr { BITMAP_PAGE_DIRTY = 1, // there are set bits that need to be synced BITMAP_PAGE_CLEAN = 2, // there are bits that might need to be cleared BITMAP_PAGE_NEEDWRITE=4, // there are cleared bits that need to be synced }; static inline void set_page_attr(struct bitmap *bitmap, struct page *page, enum bitmap_page_attr attr) { bitmap->filemap_attr[page->index] |= attr; } static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, enum bitmap_page_attr attr) { bitmap->filemap_attr[page->index] &= ~attr; } static inline unsigned long get_page_attr(struct bitmap *bitmap, struct page *page) { return bitmap->filemap_attr[page->index]; } /* * bitmap_file_set_bit -- called before performing a write to the md device * to set (and eventually sync) a particular bit in the bitmap file * * we set the bit immediately, then we record the page number so that * when an unplug occurs, we can flush the dirty pages out to disk */ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) { unsigned long bit; struct page *page; void *kaddr; unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); if (!bitmap->filemap) { return; } page = filemap_get_page(bitmap, chunk); bit = file_page_offset(chunk); /* make sure the page stays cached until it gets written out */ if (! (get_page_attr(bitmap, page) & BITMAP_PAGE_DIRTY)) page_cache_get(page); /* set the bit */ kaddr = kmap_atomic(page, KM_USER0); set_bit(bit, kaddr); kunmap_atomic(kaddr, KM_USER0); PRINTK("set file bit %lu page %lu\n", bit, page->index); /* record page number so it gets flushed to disk when unplug occurs */ set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); } /* this gets called when the md device is ready to unplug its underlying * (slave) device queues -- before we let any writes go down, we need to * sync the dirty pages of the bitmap file to disk */ int bitmap_unplug(struct bitmap *bitmap) { unsigned long i, attr, flags; struct page *page; int wait = 0; int err; if (!bitmap) return 0; /* look at each page to see if there are any set bits that need to be * flushed out to disk */ for (i = 0; i < bitmap->file_pages; i++) { spin_lock_irqsave(&bitmap->lock, flags); if (!bitmap->filemap) { spin_unlock_irqrestore(&bitmap->lock, flags); return 0; } page = bitmap->filemap[i]; attr = get_page_attr(bitmap, page); clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); if ((attr & BITMAP_PAGE_DIRTY)) wait = 1; spin_unlock_irqrestore(&bitmap->lock, flags); if (attr & (BITMAP_PAGE_DIRTY | BITMAP_PAGE_NEEDWRITE)) { err = write_page(bitmap, page, 0); if (err == -EAGAIN) { if (attr & BITMAP_PAGE_DIRTY) err = write_page(bitmap, page, 1); else err = 0; } if (err) return 1; } } if (wait) { /* if any writes were performed, we need to wait on them */ if (bitmap->file) { spin_lock_irq(&bitmap->write_lock); wait_event_lock_irq(bitmap->write_wait, list_empty(&bitmap->complete_pages), bitmap->write_lock, wake_up_process(bitmap->writeback_daemon->tsk)); spin_unlock_irq(&bitmap->write_lock); } else wait_event(bitmap->mddev->sb_wait, atomic_read(&bitmap->mddev->pending_writes)==0); } return 0; } static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); /* * bitmap_init_from_disk -- called at bitmap_create time to initialize * the in-memory bitmap from the on-disk bitmap -- also, sets up the * memory mapping of the bitmap file * Special cases: * if there's no bitmap file, or if the bitmap file had been * previously kicked from the array, we mark all the bits as * 1's in order to cause a full resync. * * We ignore all bits for sectors that end earlier than 'start'. * This is used when reading an out-of-date bitmap... */ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) { unsigned long i, chunks, index, oldindex, bit; struct page *page = NULL, *oldpage = NULL; unsigned long num_pages, bit_cnt = 0; struct file *file; unsigned long bytes, offset, dummy; int outofdate; int ret = -ENOSPC; chunks = bitmap->chunks; file = bitmap->file; BUG_ON(!file && !bitmap->offset); #ifdef INJECT_FAULTS_3 outofdate = 1; #else outofdate = bitmap->flags & BITMAP_STALE; #endif if (outofdate) printk(KERN_INFO "%s: bitmap file is out of date, doing full " "recovery\n", bmname(bitmap)); bytes = (chunks + 7) / 8; num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) { printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", bmname(bitmap), (unsigned long) i_size_read(file->f_mapping->host), bytes + sizeof(bitmap_super_t)); goto out; } ret = -ENOMEM; bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); if (!bitmap->filemap) goto out; bitmap->filemap_attr = kmalloc(sizeof(long) * num_pages, GFP_KERNEL); if (!bitmap->filemap_attr) goto out; memset(bitmap->filemap_attr, 0, sizeof(long) * num_pages); oldindex = ~0L; for (i = 0; i < chunks; i++) { index = file_page_index(i); bit = file_page_offset(i); if (index != oldindex) { /* this is a new page, read it in */ /* unmap the old page, we're done with it */ if (oldpage != NULL) kunmap(oldpage); if (index == 0) { /* * if we're here then the superblock page * contains some bits (PAGE_SIZE != sizeof sb) * we've already read it in, so just use it */ page = bitmap->sb_page; offset = sizeof(bitmap_super_t); } else if (file) { page = read_page(file, index, &dummy); offset = 0; } else { page = read_sb_page(bitmap->mddev, bitmap->offset, index); offset = 0; } if (IS_ERR(page)) { /* read error */ ret = PTR_ERR(page); goto out; } oldindex = index; oldpage = page; kmap(page); if (outofdate) { /* * if bitmap is out of date, dirty the * whole page and write it out */ memset(page_address(page) + offset, 0xff, PAGE_SIZE - offset); ret = write_page(bitmap, page, 1); if (ret) { kunmap(page); /* release, page not in filemap yet */ page_cache_release(page); goto out; } } bitmap->filemap[bitmap->file_pages++] = page; } if (test_bit(bit, page_address(page))) { /* if the disk bit is set, set the memory bit */ bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) ); bit_cnt++; set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); } } /* everything went OK */ ret = 0; bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); if (page) /* unmap the last page */ kunmap(page); if (bit_cnt) { /* Kick recovery if any bits were set */ set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); md_wakeup_thread(bitmap->mddev->thread); } out: printk(KERN_INFO "%s: bitmap initialized from disk: " "read %lu/%lu pages, set %lu bits, status: %d\n", bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret); return ret; } void bitmap_write_all(struct bitmap *bitmap) { /* We don't actually write all bitmap blocks here, * just flag them as needing to be written */ unsigned long chunks = bitmap->chunks; unsigned long bytes = (chunks+7)/8 + sizeof(bitmap_super_t); unsigned long num_pages = (bytes + PAGE_SIZE-1) / PAGE_SIZE; while (num_pages--) bitmap->filemap_attr[num_pages] |= BITMAP_PAGE_NEEDWRITE; } static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) { sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); unsigned long page = chunk >> PAGE_COUNTER_SHIFT; bitmap->bp[page].count += inc; /* if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", (unsigned long long)offset, inc, bitmap->bp[page].count); */ bitmap_checkfree(bitmap, page); } static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, sector_t offset, int *blocks, int create); /* * bitmap daemon -- periodically wakes up to clean bits and flush pages * out to disk */ int bitmap_daemon_work(struct bitmap *bitmap) { unsigned long j; unsigned long flags; struct page *page = NULL, *lastpage = NULL; int err = 0; int blocks; int attr; if (bitmap == NULL) return 0; if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) return 0; bitmap->daemon_lastrun = jiffies; for (j = 0; j < bitmap->chunks; j++) { bitmap_counter_t *bmc; spin_lock_irqsave(&bitmap->lock, flags); if (!bitmap->filemap) { /* error or shutdown */ spin_unlock_irqrestore(&bitmap->lock, flags); break; } page = filemap_get_page(bitmap, j); if (page != lastpage) { /* skip this page unless it's marked as needing cleaning */ if (!((attr=get_page_attr(bitmap, page)) & BITMAP_PAGE_CLEAN)) { if (attr & BITMAP_PAGE_NEEDWRITE) { page_cache_get(page); clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); } spin_unlock_irqrestore(&bitmap->lock, flags); if (attr & BITMAP_PAGE_NEEDWRITE) { switch (write_page(bitmap, page, 0)) { case -EAGAIN: set_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); break; case 0: break; default: bitmap_file_kick(bitmap); } page_cache_release(page); } continue; } /* grab the new page, sync and release the old */ page_cache_get(page); if (lastpage != NULL) { if (get_page_attr(bitmap, lastpage) & BITMAP_PAGE_NEEDWRITE) { clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); spin_unlock_irqrestore(&bitmap->lock, flags); err = write_page(bitmap, lastpage, 0); if (err == -EAGAIN) { err = 0; set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); } } else { set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); spin_unlock_irqrestore(&bitmap->lock, flags); } kunmap(lastpage); page_cache_release(lastpage); if (err) bitmap_file_kick(bitmap); } else spin_unlock_irqrestore(&bitmap->lock, flags); lastpage = page; kmap(page); /* printk("bitmap clean at page %lu\n", j); */ spin_lock_irqsave(&bitmap->lock, flags); clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); } bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), &blocks, 0); if (bmc) { /* if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); */ if (*bmc == 2) { *bmc=1; /* maybe clear the bit next time */ set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); } else if (*bmc == 1) { /* we can clear the bit */ *bmc = 0; bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), -1); /* clear the bit */ clear_bit(file_page_offset(j), page_address(page)); } } spin_unlock_irqrestore(&bitmap->lock, flags); } /* now sync the final page */ if (lastpage != NULL) { kunmap(lastpage); spin_lock_irqsave(&bitmap->lock, flags); if (get_page_attr(bitmap, lastpage) &BITMAP_PAGE_NEEDWRITE) { clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); spin_unlock_irqrestore(&bitmap->lock, flags); err = write_page(bitmap, lastpage, 0); if (err == -EAGAIN) { set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); err = 0; } } else { set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); spin_unlock_irqrestore(&bitmap->lock, flags); } page_cache_release(lastpage); } return err; } static void daemon_exit(struct bitmap *bitmap, mdk_thread_t **daemon) { mdk_thread_t *dmn; unsigned long flags; /* if no one is waiting on us, we'll free the md thread struct * and exit, otherwise we let the waiter clean things up */ spin_lock_irqsave(&bitmap->lock, flags); if ((dmn = *daemon)) { /* no one is waiting, cleanup and exit */ *daemon = NULL; spin_unlock_irqrestore(&bitmap->lock, flags); kfree(dmn); complete_and_exit(NULL, 0); /* do_exit not exported */ } spin_unlock_irqrestore(&bitmap->lock, flags); } static void bitmap_writeback_daemon(mddev_t *mddev) { struct bitmap *bitmap = mddev->bitmap; struct page *page; struct page_list *item; int err = 0; if (signal_pending(current)) { printk(KERN_INFO "%s: bitmap writeback daemon got signal, exiting...\n", bmname(bitmap)); err = -EINTR; goto out; } PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap)); /* wait on bitmap page writebacks */ while ((item = dequeue_page(bitmap))) { page = item->page; mempool_free(item, bitmap->write_pool); PRINTK("wait on page writeback: %p\n", page); wait_on_page_writeback(page); PRINTK("finished page writeback: %p\n", page); err = PageError(page); page_cache_release(page); if (err) { printk(KERN_WARNING "%s: bitmap file writeback " "failed (page %lu): %d\n", bmname(bitmap), page->index, err); bitmap_file_kick(bitmap); goto out; } } out: wake_up(&bitmap->write_wait); if (err) { printk(KERN_INFO "%s: bitmap writeback daemon exiting (%d)\n", bmname(bitmap), err); daemon_exit(bitmap, &bitmap->writeback_daemon); } } static int bitmap_start_daemon(struct bitmap *bitmap, mdk_thread_t **ptr, void (*func)(mddev_t *), char *name) { mdk_thread_t *daemon; unsigned long flags; char namebuf[32]; spin_lock_irqsave(&bitmap->lock, flags); *ptr = NULL; if (!bitmap->file) /* no need for daemon if there's no backing file */ goto out_unlock; spin_unlock_irqrestore(&bitmap->lock, flags); #ifdef INJECT_FATAL_FAULT_2 daemon = NULL; #else sprintf(namebuf, "%%s_%s", name); daemon = md_register_thread(func, bitmap->mddev, namebuf); #endif if (!daemon) { printk(KERN_ERR "%s: failed to start bitmap daemon\n", bmname(bitmap)); return -ECHILD; } spin_lock_irqsave(&bitmap->lock, flags); *ptr = daemon; md_wakeup_thread(daemon); /* start it running */ PRINTK("%s: %s daemon (pid %d) started...\n", bmname(bitmap), name, daemon->tsk->pid); out_unlock: spin_unlock_irqrestore(&bitmap->lock, flags); return 0; } static int bitmap_start_daemons(struct bitmap *bitmap) { int err = bitmap_start_daemon(bitmap, &bitmap->writeback_daemon, bitmap_writeback_daemon, "bitmap_wb"); return err; } static void bitmap_stop_daemon(struct bitmap *bitmap, mdk_thread_t **ptr) { mdk_thread_t *daemon; unsigned long flags; spin_lock_irqsave(&bitmap->lock, flags); daemon = *ptr; *ptr = NULL; spin_unlock_irqrestore(&bitmap->lock, flags); if (daemon) md_unregister_thread(daemon); /* destroy the thread */ } static void bitmap_stop_daemons(struct bitmap *bitmap) {


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