Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
---
fs/minix/file.c | 3 +
fs/minix/inode.c | 82 +++++++++++++++++++++++++++++++++++++++++++-----
fs/minix/itree_common.c | 5 +-
fs/minix/itree_v1.c | 4 +-
fs/minix/itree_v2.c | 4 +-
fs/minix/minix.h | 6 +--
6 files changed, 85 insertions(+), 19 deletions(-)
Index: linux-2.6/fs/minix/file.c
===================================================================
--- linux-2.6.orig/fs/minix/file.c
+++ linux-2.6/fs/minix/file.c
@@ -24,6 +24,7 @@ const struct file_operations minix_file_
};
const struct inode_operations minix_file_inode_operations = {
- .truncate = minix_truncate,
+ .new_truncate = 1,
+ .setattr = minix_setattr,
.getattr = minix_getattr,
};
Index: linux-2.6/fs/minix/inode.c
===================================================================
--- linux-2.6.orig/fs/minix/inode.c
+++ linux-2.6/fs/minix/inode.c
@@ -18,15 +18,16 @@
#include <linux/highuid.h>
#include <linux/vfs.h>
-static int minix_write_inode(struct inode * inode, int wait);
+static int minix_write_inode(struct inode *inode, int wait);
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
-static int minix_remount (struct super_block * sb, int * flags, char * data);
+static int minix_remount(struct super_block *sb, int *flags, char *data);
+static void minix_truncate_blocks(struct inode *inode, loff_t offset);
static void minix_delete_inode(struct inode *inode)
{
truncate_inode_pages(&inode->i_data, 0);
inode->i_size = 0;
- minix_truncate(inode);
+ minix_truncate_blocks(inode, 0);
minix_free_inode(inode);
}
@@ -367,8 +368,33 @@ static int minix_write_begin(struct file
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
+ int ret;
+
*pagep = NULL;
- return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
+ ret = __minix_write_begin(file, mapping, pos, len, flags, pagep,fsdata);
+ if (ret < 0) {
+ struct inode *inode = mapping->host;
+ loff_t isize = inode->i_size;
+ if (pos + len > isize)
+ minix_truncate_blocks(inode, isize);
+ }
+ return ret;
+}
+
+static int minix_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ int ret;
+
+ ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
+ if (ret < len) {
+ struct inode *inode = mapping->host;
+ loff_t isize = inode->i_size;
+ if (pos + len > isize)
+ minix_truncate_blocks(inode, isize);
+ }
+ return ret;
}
static sector_t minix_bmap(struct address_space *mapping, sector_t block)
@@ -381,7 +407,7 @@ static const struct address_space_operat
.writepage = minix_writepage,
.sync_page = block_sync_page,
.write_begin = minix_write_begin,
- .write_end = generic_write_end,
+ .write_end = minix_write_end,
.bmap = minix_bmap
};
@@ -591,14 +617,54 @@ int minix_getattr(struct vfsmount *mnt,
/*
* The function that is called for file truncation.
*/
-void minix_truncate(struct inode * inode)
+static void minix_truncate_blocks(struct inode *inode, loff_t offset)
{
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
return;
if (INODE_VERSION(inode) == MINIX_V1)
- V1_minix_truncate(inode);
+ V1_minix_truncate_blocks(inode, offset);
else
- V2_minix_truncate(inode);
+ V2_minix_truncate_blocks(inode, offset);
+}
+
+static int minix_setsize(struct inode *inode, loff_t newsize)
+{
+ loff_t oldsize;
+ int error;
+
+ error = inode_newsize_ok(inode, newsize);
+ if (error)
+ return error;
+
+ oldsize = inode->i_size;
+ i_size_write(inode, newsize);
+ truncate_pagecache(inode, oldsize, newsize);
+
+ error = block_truncate_page(inode->i_mapping, newsize, minix_get_block);
+ if (error)
+ return error;
+ minix_truncate_blocks(inode, newsize);
+
+ return error;
+}
+
+int minix_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+ if (iattr->ia_valid & ATTR_SIZE) {
+ error = minix_setsize(inode, iattr->ia_size);
+ if (error)
+ return error;
+ }
+ generic_setattr(inode, iattr);
+ mark_inode_dirty(inode);
+
+ return error;
}
static int minix_get_sb(struct file_system_type *fs_type,
Index: linux-2.6/fs/minix/itree_common.c
===================================================================
--- linux-2.6.orig/fs/minix/itree_common.c
+++ linux-2.6/fs/minix/itree_common.c
@@ -290,7 +290,7 @@ static void free_branches(struct inode *
free_data(inode, p, q);
}
-static inline void truncate (struct inode * inode)
+static inline void truncate_blocks(struct inode *inode, loff_t offset)
{
struct super_block *sb = inode->i_sb;
block_t *idata = i_data(inode);
@@ -302,8 +302,7 @@ static inline void truncate (struct inod
int first_whole;
long iblock;
- iblock = (inode->i_size + sb->s_blocksize -1) >> sb->s_blocksize_bits;
- block_truncate_page(inode->i_mapping, inode->i_size, get_block);
+ iblock = (offset + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
n = block_to_path(inode, iblock, offsets);
if (!n)
Index: linux-2.6/fs/minix/itree_v1.c
===================================================================
--- linux-2.6.orig/fs/minix/itree_v1.c
+++ linux-2.6/fs/minix/itree_v1.c
@@ -55,9 +55,9 @@ int V1_minix_get_block(struct inode * in
return get_block(inode, block, bh_result, create);
}
-void V1_minix_truncate(struct inode * inode)
+void V1_minix_truncate_blocks(struct inode *inode, loff_t offset)
{
- truncate(inode);
+ truncate_blocks(inode, offset);
}
unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
Index: linux-2.6/fs/minix/itree_v2.c
===================================================================
--- linux-2.6.orig/fs/minix/itree_v2.c
+++ linux-2.6/fs/minix/itree_v2.c
@@ -61,9 +61,9 @@ int V2_minix_get_block(struct inode * in
return get_block(inode, block, bh_result, create);
}
-void V2_minix_truncate(struct inode * inode)
+void V2_minix_truncate_blocks(struct inode *inode, loff_t offset)
{
- truncate(inode);
+ truncate_blocks(inode, offset);
}
unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
Index: linux-2.6/fs/minix/minix.h
===================================================================
--- linux-2.6.orig/fs/minix/minix.h
+++ linux-2.6/fs/minix/minix.h
@@ -52,14 +52,14 @@ extern unsigned long minix_count_free_in
extern int minix_new_block(struct inode * inode);
extern void minix_free_block(struct inode *inode, unsigned long block);
extern unsigned long minix_count_free_blocks(struct minix_sb_info *sbi);
+extern int minix_setattr(struct dentry *dentry, struct iattr *iattr);
extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int __minix_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata);
-extern void V1_minix_truncate(struct inode *);
-extern void V2_minix_truncate(struct inode *);
-extern void minix_truncate(struct inode *);
+extern void V1_minix_truncate_blocks(struct inode *, loff_t);
+extern void V2_minix_truncate_blocks(struct inode *, loff_t);
extern void minix_set_inode(struct inode *, dev_t);
extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
--
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