dma-buf: minor documentation fixes.
[linux-2.6.git] / fs / ufs / truncate.c
index ea11d04..f04f89f 100644 (file)
  */
 
 /*
- * Modified to avoid infinite loop on 2006 by
- * Evgeniy Dushistov <dushistov@mail.ru>
+ * Adoptation to use page cache and UFS2 write support by
+ * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
  */
 
 #include <linux/errno.h>
 #include <linux/fs.h>
-#include <linux/ufs_fs.h>
 #include <linux/fcntl.h>
 #include <linux/time.h>
 #include <linux/stat.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/blkdev.h>
 #include <linux/sched.h>
 
+#include "ufs_fs.h"
+#include "ufs.h"
 #include "swab.h"
 #include "util.h"
 
 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 
 
-static int ufs_trunc_direct (struct inode * inode)
+static int ufs_trunc_direct(struct inode *inode)
 {
        struct ufs_inode_info *ufsi = UFS_I(inode);
        struct super_block * sb;
        struct ufs_sb_private_info * uspi;
-       __fs32 * p;
-       unsigned frag1, frag2, frag3, frag4, block1, block2;
+       void *p;
+       u64 frag1, frag2, frag3, frag4, block1, block2;
        unsigned frag_to_free, free_count;
        unsigned i, tmp;
        int retry;
        
-       UFSD("ENTER\n");
+       UFSD("ENTER: ino %lu\n", inode->i_ino);
 
        sb = inode->i_sb;
        uspi = UFS_SB(sb)->s_uspi;
@@ -84,20 +84,23 @@ static int ufs_trunc_direct (struct inode * inode)
        retry = 0;
        
        frag1 = DIRECT_FRAGMENT;
-       frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
+       frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
        frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
        frag3 = frag4 & ~uspi->s_fpbmask;
        block1 = block2 = 0;
        if (frag2 > frag3) {
                frag2 = frag4;
                frag3 = frag4 = 0;
-       }
-       else if (frag2 < frag3) {
+       } else if (frag2 < frag3) {
                block1 = ufs_fragstoblks (frag2);
                block2 = ufs_fragstoblks (frag3);
        }
 
-       UFSD("frag1 %u, frag2 %u, block1 %u, block2 %u, frag3 %u, frag4 %u\n", frag1, frag2, block1, block2, frag3, frag4);
+       UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
+            " frag3 %llu, frag4 %llu\n", inode->i_ino,
+            (unsigned long long)frag1, (unsigned long long)frag2,
+            (unsigned long long)block1, (unsigned long long)block2,
+            (unsigned long long)frag3, (unsigned long long)frag4);
 
        if (frag1 >= frag2)
                goto next1;             
@@ -105,14 +108,14 @@ static int ufs_trunc_direct (struct inode * inode)
        /*
         * Free first free fragments
         */
-       p = ufsi->i_u1.i_data + ufs_fragstoblks (frag1);
-       tmp = fs32_to_cpu(sb, *p);
+       p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
+       tmp = ufs_data_ptr_to_cpu(sb, p);
        if (!tmp )
                ufs_panic (sb, "ufs_trunc_direct", "internal error");
+       frag2 -= frag1;
        frag1 = ufs_fragnum (frag1);
-       frag2 = ufs_fragnum (frag2);
 
-       ufs_free_fragments (inode, tmp + frag1, frag2 - frag1);
+       ufs_free_fragments(inode, tmp + frag1, frag2);
        mark_inode_dirty(inode);
        frag_to_free = tmp + frag1;
 
@@ -121,12 +124,11 @@ next1:
         * Free whole blocks
         */
        for (i = block1 ; i < block2; i++) {
-               p = ufsi->i_u1.i_data + i;
-               tmp = fs32_to_cpu(sb, *p);
+               p = ufs_get_direct_data_ptr(uspi, ufsi, i);
+               tmp = ufs_data_ptr_to_cpu(sb, p);
                if (!tmp)
                        continue;
-
-               *p = 0;
+               ufs_data_ptr_clear(uspi, p);
 
                if (free_count == 0) {
                        frag_to_free = tmp;
@@ -150,34 +152,36 @@ next1:
        /*
         * Free last free fragments
         */
-       p = ufsi->i_u1.i_data + ufs_fragstoblks (frag3);
-       tmp = fs32_to_cpu(sb, *p);
+       p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
+       tmp = ufs_data_ptr_to_cpu(sb, p);
        if (!tmp )
                ufs_panic(sb, "ufs_truncate_direct", "internal error");
        frag4 = ufs_fragnum (frag4);
-
-       *p = 0;
+       ufs_data_ptr_clear(uspi, p);
 
        ufs_free_fragments (inode, tmp, frag4);
        mark_inode_dirty(inode);
  next3:
 
-       UFSD("EXIT\n");
+       UFSD("EXIT: ino %lu\n", inode->i_ino);
        return retry;
 }
 
 
-static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
+static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
 {
        struct super_block * sb;
        struct ufs_sb_private_info * uspi;
        struct ufs_buffer_head * ind_ubh;
-       __fs32 * ind;
-       unsigned indirect_block, i, tmp;
-       unsigned frag_to_free, free_count;
+       void *ind;
+       u64 tmp, indirect_block, i, frag_to_free;
+       unsigned free_count;
        int retry;
 
-       UFSD("ENTER\n");
+       UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
+            inode->i_ino, (unsigned long long)offset, p);
+
+       BUG_ON(!p);
                
        sb = inode->i_sb;
        uspi = UFS_SB(sb)->s_uspi;
@@ -186,27 +190,27 @@ static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
        free_count = 0;
        retry = 0;
        
-       tmp = fs32_to_cpu(sb, *p);
+       tmp = ufs_data_ptr_to_cpu(sb, p);
        if (!tmp)
                return 0;
        ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
-       if (tmp != fs32_to_cpu(sb, *p)) {
+       if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
                ubh_brelse (ind_ubh);
                return 1;
        }
        if (!ind_ubh) {
-               *p = 0;
+               ufs_data_ptr_clear(uspi, p);
                return 0;
        }
 
        indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
        for (i = indirect_block; i < uspi->s_apb; i++) {
-               ind = ubh_get_addr32 (ind_ubh, i);
-               tmp = fs32_to_cpu(sb, *ind);
+               ind = ubh_get_data_ptr(uspi, ind_ubh, i);
+               tmp = ufs_data_ptr_to_cpu(sb, ind);
                if (!tmp)
                        continue;
 
-               *ind = 0;
+               ufs_data_ptr_clear(uspi, ind);
                ubh_mark_buffer_dirty(ind_ubh);
                if (free_count == 0) {
                        frag_to_free = tmp;
@@ -226,38 +230,37 @@ static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
                ufs_free_blocks (inode, frag_to_free, free_count);
        }
        for (i = 0; i < uspi->s_apb; i++)
-               if (*ubh_get_addr32(ind_ubh,i))
+               if (!ufs_is_data_ptr_zero(uspi,
+                                         ubh_get_data_ptr(uspi, ind_ubh, i)))
                        break;
        if (i >= uspi->s_apb) {
-               tmp = fs32_to_cpu(sb, *p);
-               *p = 0;
+               tmp = ufs_data_ptr_to_cpu(sb, p);
+               ufs_data_ptr_clear(uspi, p);
 
                ufs_free_blocks (inode, tmp, uspi->s_fpb);
                mark_inode_dirty(inode);
                ubh_bforget(ind_ubh);
                ind_ubh = NULL;
        }
-       if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
-               ubh_ll_rw_block(SWRITE, ind_ubh);
-               ubh_wait_on_buffer (ind_ubh);
-       }
+       if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
+               ubh_sync_block(ind_ubh);
        ubh_brelse (ind_ubh);
        
-       UFSD("EXIT\n");
+       UFSD("EXIT: ino %lu\n", inode->i_ino);
        
        return retry;
 }
 
-static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
+static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
 {
        struct super_block * sb;
        struct ufs_sb_private_info * uspi;
-       struct ufs_buffer_head * dind_bh;
-       unsigned i, tmp, dindirect_block;
-       __fs32 * dind;
+       struct ufs_buffer_head *dind_bh;
+       u64 i, tmp, dindirect_block;
+       void *dind;
        int retry = 0;
        
-       UFSD("ENTER\n");
+       UFSD("ENTER: ino %lu\n", inode->i_ino);
        
        sb = inode->i_sb;
        uspi = UFS_SB(sb)->s_uspi;
@@ -266,22 +269,22 @@ static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
                ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
        retry = 0;
        
-       tmp = fs32_to_cpu(sb, *p);
+       tmp = ufs_data_ptr_to_cpu(sb, p);
        if (!tmp)
                return 0;
        dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
-       if (tmp != fs32_to_cpu(sb, *p)) {
+       if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
                ubh_brelse (dind_bh);
                return 1;
        }
        if (!dind_bh) {
-               *p = 0;
+               ufs_data_ptr_clear(uspi, p);
                return 0;
        }
 
        for (i = dindirect_block ; i < uspi->s_apb ; i++) {
-               dind = ubh_get_addr32 (dind_bh, i);
-               tmp = fs32_to_cpu(sb, *dind);
+               dind = ubh_get_data_ptr(uspi, dind_bh, i);
+               tmp = ufs_data_ptr_to_cpu(sb, dind);
                if (!tmp)
                        continue;
                retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
@@ -289,95 +292,95 @@ static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
        }
 
        for (i = 0; i < uspi->s_apb; i++)
-               if (*ubh_get_addr32 (dind_bh, i))
+               if (!ufs_is_data_ptr_zero(uspi,
+                                         ubh_get_data_ptr(uspi, dind_bh, i)))
                        break;
        if (i >= uspi->s_apb) {
-               tmp = fs32_to_cpu(sb, *p);
-               *p = 0;
+               tmp = ufs_data_ptr_to_cpu(sb, p);
+               ufs_data_ptr_clear(uspi, p);
 
                ufs_free_blocks(inode, tmp, uspi->s_fpb);
                mark_inode_dirty(inode);
                ubh_bforget(dind_bh);
                dind_bh = NULL;
        }
-       if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
-               ubh_ll_rw_block(SWRITE, dind_bh);
-               ubh_wait_on_buffer (dind_bh);
-       }
+       if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
+               ubh_sync_block(dind_bh);
        ubh_brelse (dind_bh);
        
-       UFSD("EXIT\n");
+       UFSD("EXIT: ino %lu\n", inode->i_ino);
        
        return retry;
 }
 
-static int ufs_trunc_tindirect (struct inode * inode)
+static int ufs_trunc_tindirect(struct inode *inode)
 {
+       struct super_block *sb = inode->i_sb;
+       struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
        struct ufs_inode_info *ufsi = UFS_I(inode);
-       struct super_block * sb;
-       struct ufs_sb_private_info * uspi;
        struct ufs_buffer_head * tind_bh;
-       unsigned tindirect_block, tmp, i;
-       __fs32 * tind, * p;
+       u64 tindirect_block, tmp, i;
+       void *tind, *p;
        int retry;
        
-       UFSD("ENTER\n");
+       UFSD("ENTER: ino %lu\n", inode->i_ino);
 
-       sb = inode->i_sb;
-       uspi = UFS_SB(sb)->s_uspi;
        retry = 0;
        
        tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
                ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
-       p = ufsi->i_u1.i_data + UFS_TIND_BLOCK;
-       if (!(tmp = fs32_to_cpu(sb, *p)))
+
+       p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
+       if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
                return 0;
        tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
-       if (tmp != fs32_to_cpu(sb, *p)) {
+       if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
                ubh_brelse (tind_bh);
                return 1;
        }
        if (!tind_bh) {
-               *p = 0;
+               ufs_data_ptr_clear(uspi, p);
                return 0;
        }
 
        for (i = tindirect_block ; i < uspi->s_apb ; i++) {
-               tind = ubh_get_addr32 (tind_bh, i);
+               tind = ubh_get_data_ptr(uspi, tind_bh, i);
                retry |= ufs_trunc_dindirect(inode, UFS_NDADDR + 
                        uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
                ubh_mark_buffer_dirty(tind_bh);
        }
        for (i = 0; i < uspi->s_apb; i++)
-               if (*ubh_get_addr32 (tind_bh, i))
+               if (!ufs_is_data_ptr_zero(uspi,
+                                         ubh_get_data_ptr(uspi, tind_bh, i)))
                        break;
        if (i >= uspi->s_apb) {
-               tmp = fs32_to_cpu(sb, *p);
-               *p = 0;
+               tmp = ufs_data_ptr_to_cpu(sb, p);
+               ufs_data_ptr_clear(uspi, p);
 
                ufs_free_blocks(inode, tmp, uspi->s_fpb);
                mark_inode_dirty(inode);
                ubh_bforget(tind_bh);
                tind_bh = NULL;
        }
-       if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
-               ubh_ll_rw_block(SWRITE, tind_bh);
-               ubh_wait_on_buffer (tind_bh);
-       }
+       if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
+               ubh_sync_block(tind_bh);
        ubh_brelse (tind_bh);
        
-       UFSD("EXIT\n");
+       UFSD("EXIT: ino %lu\n", inode->i_ino);
        return retry;
 }
 
 static int ufs_alloc_lastblock(struct inode *inode)
 {
        int err = 0;
+       struct super_block *sb = inode->i_sb;
        struct address_space *mapping = inode->i_mapping;
-       struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
-       unsigned lastfrag, i, end;
+       struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+       unsigned i, end;
+       sector_t lastfrag;
        struct page *lastpage;
        struct buffer_head *bh;
+       u64 phys64;
 
        lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
 
@@ -417,6 +420,20 @@ static int ufs_alloc_lastblock(struct inode *inode)
               set_page_dirty(lastpage);
        }
 
+       if (lastfrag >= UFS_IND_FRAGMENT) {
+              end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
+              phys64 = bh->b_blocknr + 1;
+              for (i = 0; i < end; ++i) {
+                      bh = sb_getblk(sb, i + phys64);
+                      lock_buffer(bh);
+                      memset(bh->b_data, 0, sb->s_blocksize);
+                      set_buffer_uptodate(bh);
+                      mark_buffer_dirty(bh);
+                      unlock_buffer(bh);
+                      sync_dirty_buffer(bh);
+                      brelse(bh);
+              }
+       }
 out_unlock:
        ufs_put_locked_page(lastpage);
 out:
@@ -430,7 +447,9 @@ int ufs_truncate(struct inode *inode, loff_t old_i_size)
        struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
        int retry, err = 0;
        
-       UFSD("ENTER\n");
+       UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
+            inode->i_ino, (unsigned long long)i_size_read(inode),
+            (unsigned long long)old_i_size);
 
        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
              S_ISLNK(inode->i_mode)))
@@ -447,39 +466,31 @@ int ufs_truncate(struct inode *inode, loff_t old_i_size)
 
        block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
 
-       lock_kernel();
        while (1) {
                retry = ufs_trunc_direct(inode);
-               retry |= ufs_trunc_indirect (inode, UFS_IND_BLOCK,
-                       (__fs32 *) &ufsi->i_u1.i_data[UFS_IND_BLOCK]);
-               retry |= ufs_trunc_dindirect (inode, UFS_IND_BLOCK + uspi->s_apb,
-                       (__fs32 *) &ufsi->i_u1.i_data[UFS_DIND_BLOCK]);
+               retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
+                                           ufs_get_direct_data_ptr(uspi, ufsi,
+                                                                   UFS_IND_BLOCK));
+               retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
+                                            ufs_get_direct_data_ptr(uspi, ufsi,
+                                                                    UFS_DIND_BLOCK));
                retry |= ufs_trunc_tindirect (inode);
                if (!retry)
                        break;
                if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
                        ufs_sync_inode (inode);
-               blk_run_address_space(inode->i_mapping);
                yield();
        }
 
        inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
        ufsi->i_lastfrag = DIRECT_FRAGMENT;
-       unlock_kernel();
        mark_inode_dirty(inode);
 out:
        UFSD("EXIT: err %d\n", err);
        return err;
 }
 
-
-/*
- * We don't define our `inode->i_op->truncate', and call it here,
- * because of:
- * - there is no way to know old size
- * - there is no way inform user about error, if it happens in `truncate'
- */
-static int ufs_setattr(struct dentry *dentry, struct iattr *attr)
+int ufs_setattr(struct dentry *dentry, struct iattr *attr)
 {
        struct inode *inode = dentry->d_inode;
        unsigned int ia_valid = attr->ia_valid;
@@ -489,19 +500,24 @@ static int ufs_setattr(struct dentry *dentry, struct iattr *attr)
        if (error)
                return error;
 
-       if (ia_valid & ATTR_SIZE &&
-           attr->ia_size != i_size_read(inode)) {
+       if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
                loff_t old_i_size = inode->i_size;
-               error = vmtruncate(inode, attr->ia_size);
-               if (error)
-                       return error;
+
+               /* XXX(truncate): truncate_setsize should be called last */
+               truncate_setsize(inode, attr->ia_size);
+
+               lock_ufs(inode->i_sb);
                error = ufs_truncate(inode, old_i_size);
+               unlock_ufs(inode->i_sb);
                if (error)
                        return error;
        }
-       return inode_setattr(inode, attr);
+
+       setattr_copy(inode, attr);
+       mark_inode_dirty(inode);
+       return 0;
 }
 
-struct inode_operations ufs_file_inode_operations = {
+const struct inode_operations ufs_file_inode_operations = {
        .setattr = ufs_setattr,
 };