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-rw-r--r--fs/udf/inode.c239
1 files changed, 166 insertions, 73 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index c6a2e78..ccc8143 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -73,14 +73,12 @@ void udf_evict_inode(struct inode *inode)
struct udf_inode_info *iinfo = UDF_I(inode);
int want_delete = 0;
- truncate_inode_pages(&inode->i_data, 0);
-
if (!inode->i_nlink && !is_bad_inode(inode)) {
want_delete = 1;
- inode->i_size = 0;
- udf_truncate(inode);
+ udf_setsize(inode, 0);
udf_update_inode(inode, IS_SYNC(inode));
- }
+ } else
+ truncate_inode_pages(&inode->i_data, 0);
invalidate_inode_buffers(inode);
end_writeback(inode);
if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
@@ -117,9 +115,18 @@ static int udf_write_begin(struct file *file, struct address_space *mapping,
ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
if (unlikely(ret)) {
- loff_t isize = mapping->host->i_size;
- if (pos + len > isize)
- vmtruncate(mapping->host, isize);
+ struct inode *inode = mapping->host;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ loff_t isize = inode->i_size;
+
+ if (pos + len > isize) {
+ truncate_pagecache(inode, pos + len, isize);
+ if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+ down_write(&iinfo->i_data_sem);
+ udf_truncate_extents(inode);
+ up_write(&iinfo->i_data_sem);
+ }
+ }
}
return ret;
@@ -139,30 +146,31 @@ const struct address_space_operations udf_aops = {
.bmap = udf_bmap,
};
-void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
+int udf_expand_file_adinicb(struct inode *inode)
{
struct page *page;
char *kaddr;
struct udf_inode_info *iinfo = UDF_I(inode);
+ int err;
struct writeback_control udf_wbc = {
.sync_mode = WB_SYNC_NONE,
.nr_to_write = 1,
};
- /* from now on we have normal address_space methods */
- inode->i_data.a_ops = &udf_aops;
-
if (!iinfo->i_lenAlloc) {
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
else
iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+ /* from now on we have normal address_space methods */
+ inode->i_data.a_ops = &udf_aops;
mark_inode_dirty(inode);
- return;
+ return 0;
}
- page = grab_cache_page(inode->i_mapping, 0);
- BUG_ON(!PageLocked(page));
+ page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+ if (!page)
+ return -ENOMEM;
if (!PageUptodate(page)) {
kaddr = kmap(page);
@@ -181,11 +189,24 @@ void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
else
iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
-
- inode->i_data.a_ops->writepage(page, &udf_wbc);
+ /* from now on we have normal address_space methods */
+ inode->i_data.a_ops = &udf_aops;
+ err = inode->i_data.a_ops->writepage(page, &udf_wbc);
+ if (err) {
+ /* Restore everything back so that we don't lose data... */
+ lock_page(page);
+ kaddr = kmap(page);
+ memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
+ inode->i_size);
+ kunmap(page);
+ unlock_page(page);
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+ inode->i_data.a_ops = &udf_adinicb_aops;
+ }
page_cache_release(page);
-
mark_inode_dirty(inode);
+
+ return err;
}
struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
@@ -348,8 +369,10 @@ static struct buffer_head *udf_getblk(struct inode *inode, long block,
}
/* Extend the file by 'blocks' blocks, return the number of extents added */
-int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
- struct kernel_long_ad *last_ext, sector_t blocks)
+static int udf_do_extend_file(struct inode *inode,
+ struct extent_position *last_pos,
+ struct kernel_long_ad *last_ext,
+ sector_t blocks)
{
sector_t add;
int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
@@ -357,6 +380,7 @@ int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
struct kernel_lb_addr prealloc_loc = {};
int prealloc_len = 0;
struct udf_inode_info *iinfo;
+ int err;
/* The previous extent is fake and we should not extend by anything
* - there's nothing to do... */
@@ -422,26 +446,29 @@ int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
/* Create enough extents to cover the whole hole */
while (blocks > add) {
blocks -= add;
- if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
- last_ext->extLength, 1) == -1)
- return -1;
+ err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ if (err)
+ return err;
count++;
}
if (blocks) {
last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
(blocks << sb->s_blocksize_bits);
- if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
- last_ext->extLength, 1) == -1)
- return -1;
+ err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ if (err)
+ return err;
count++;
}
out:
/* Do we have some preallocated blocks saved? */
if (prealloc_len) {
- if (udf_add_aext(inode, last_pos, &prealloc_loc,
- prealloc_len, 1) == -1)
- return -1;
+ err = udf_add_aext(inode, last_pos, &prealloc_loc,
+ prealloc_len, 1);
+ if (err)
+ return err;
last_ext->extLocation = prealloc_loc;
last_ext->extLength = prealloc_len;
count++;
@@ -453,11 +480,68 @@ out:
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
last_pos->offset -= sizeof(struct long_ad);
else
- return -1;
+ return -EIO;
return count;
}
+static int udf_extend_file(struct inode *inode, loff_t newsize)
+{
+
+ struct extent_position epos;
+ struct kernel_lb_addr eloc;
+ uint32_t elen;
+ int8_t etype;
+ struct super_block *sb = inode->i_sb;
+ sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
+ int adsize;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct kernel_long_ad extent;
+ int err;
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ BUG();
+
+ etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
+
+ /* File has extent covering the new size (could happen when extending
+ * inside a block)? */
+ if (etype != -1)
+ return 0;
+ if (newsize & (sb->s_blocksize - 1))
+ offset++;
+ /* Extended file just to the boundary of the last file block? */
+ if (offset == 0)
+ return 0;
+
+ /* Truncate is extending the file by 'offset' blocks */
+ if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
+ (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
+ /* File has no extents at all or has empty last
+ * indirect extent! Create a fake extent... */
+ extent.extLocation.logicalBlockNum = 0;
+ extent.extLocation.partitionReferenceNum = 0;
+ extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+ } else {
+ epos.offset -= adsize;
+ etype = udf_next_aext(inode, &epos, &extent.extLocation,
+ &extent.extLength, 0);
+ extent.extLength |= etype << 30;
+ }
+ err = udf_do_extend_file(inode, &epos, &extent, offset);
+ if (err < 0)
+ goto out;
+ err = 0;
+ iinfo->i_lenExtents = newsize;
+out:
+ brelse(epos.bh);
+ return err;
+}
+
static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
int *err, sector_t *phys, int *new)
{
@@ -540,7 +624,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
elen = EXT_RECORDED_ALLOCATED |
((elen + inode->i_sb->s_blocksize - 1) &
~(inode->i_sb->s_blocksize - 1));
- etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
+ udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
}
brelse(prev_epos.bh);
brelse(cur_epos.bh);
@@ -564,19 +648,17 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
memset(&laarr[0].extLocation, 0x00,
sizeof(struct kernel_lb_addr));
laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
- /* Will udf_extend_file() create real extent from
+ /* Will udf_do_extend_file() create real extent from
a fake one? */
startnum = (offset > 0);
}
/* Create extents for the hole between EOF and offset */
- ret = udf_extend_file(inode, &prev_epos, laarr, offset);
- if (ret == -1) {
+ ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
+ if (ret < 0) {
brelse(prev_epos.bh);
brelse(cur_epos.bh);
brelse(next_epos.bh);
- /* We don't really know the error here so we just make
- * something up */
- *err = -ENOSPC;
+ *err = ret;
return NULL;
}
c = 0;
@@ -1005,52 +1087,66 @@ struct buffer_head *udf_bread(struct inode *inode, int block,
return NULL;
}
-void udf_truncate(struct inode *inode)
+int udf_setsize(struct inode *inode, loff_t newsize)
{
- int offset;
int err;
struct udf_inode_info *iinfo;
+ int bsize = 1 << inode->i_blkbits;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
- return;
+ return -EINVAL;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- return;
+ return -EPERM;
iinfo = UDF_I(inode);
- if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ if (newsize > inode->i_size) {
down_write(&iinfo->i_data_sem);
- if (inode->i_sb->s_blocksize <
- (udf_file_entry_alloc_offset(inode) +
- inode->i_size)) {
- udf_expand_file_adinicb(inode, inode->i_size, &err);
- if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
- inode->i_size = iinfo->i_lenAlloc;
- up_write(&iinfo->i_data_sem);
- return;
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ if (bsize <
+ (udf_file_entry_alloc_offset(inode) + newsize)) {
+ err = udf_expand_file_adinicb(inode);
+ if (err) {
+ up_write(&iinfo->i_data_sem);
+ return err;
+ }
} else
- udf_truncate_extents(inode);
- } else {
- offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
- memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
- 0x00, inode->i_sb->s_blocksize -
- offset - udf_file_entry_alloc_offset(inode));
- iinfo->i_lenAlloc = inode->i_size;
+ iinfo->i_lenAlloc = newsize;
+ }
+ err = udf_extend_file(inode, newsize);
+ if (err) {
+ up_write(&iinfo->i_data_sem);
+ return err;
}
+ truncate_setsize(inode, newsize);
up_write(&iinfo->i_data_sem);
} else {
- block_truncate_page(inode->i_mapping, inode->i_size,
- udf_get_block);
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ down_write(&iinfo->i_data_sem);
+ memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
+ 0x00, bsize - newsize -
+ udf_file_entry_alloc_offset(inode));
+ iinfo->i_lenAlloc = newsize;
+ truncate_setsize(inode, newsize);
+ up_write(&iinfo->i_data_sem);
+ goto update_time;
+ }
+ err = block_truncate_page(inode->i_mapping, newsize,
+ udf_get_block);
+ if (err)
+ return err;
down_write(&iinfo->i_data_sem);
+ truncate_setsize(inode, newsize);
udf_truncate_extents(inode);
up_write(&iinfo->i_data_sem);
}
-
+update_time:
inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
if (IS_SYNC(inode))
udf_sync_inode(inode);
else
mark_inode_dirty(inode);
+ return 0;
}
static void __udf_read_inode(struct inode *inode)
@@ -1637,14 +1733,13 @@ struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
return NULL;
}
-int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
- struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+int udf_add_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
{
int adsize;
struct short_ad *sad = NULL;
struct long_ad *lad = NULL;
struct allocExtDesc *aed;
- int8_t etype;
uint8_t *ptr;
struct udf_inode_info *iinfo = UDF_I(inode);
@@ -1660,7 +1755,7 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(struct long_ad);
else
- return -1;
+ return -EIO;
if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
unsigned char *sptr, *dptr;
@@ -1672,12 +1767,12 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
obloc.partitionReferenceNum,
obloc.logicalBlockNum, &err);
if (!epos->block.logicalBlockNum)
- return -1;
+ return -ENOSPC;
nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
&epos->block,
0));
if (!nbh)
- return -1;
+ return -EIO;
lock_buffer(nbh);
memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
set_buffer_uptodate(nbh);
@@ -1746,7 +1841,7 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
epos->bh = nbh;
}
- etype = udf_write_aext(inode, epos, eloc, elen, inc);
+ udf_write_aext(inode, epos, eloc, elen, inc);
if (!epos->bh) {
iinfo->i_lenAlloc += adsize;
@@ -1764,11 +1859,11 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
mark_buffer_dirty_inode(epos->bh, inode);
}
- return etype;
+ return 0;
}
-int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
- struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+void udf_write_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
{
int adsize;
uint8_t *ptr;
@@ -1798,7 +1893,7 @@ int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
adsize = sizeof(struct long_ad);
break;
default:
- return -1;
+ return;
}
if (epos->bh) {
@@ -1817,8 +1912,6 @@ int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
if (inc)
epos->offset += adsize;
-
- return (elen >> 30);
}
int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
generated by cgit v1.1 at 2024-12-27 06:51:53 +0000