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NTFS: Fixup handling of sparse, compressed, and encrypted attributes in

Browse Source 
fs/ntfs/aops.c::ntfs_readpage().

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-09-08 22:04:20 +01:00
parent 8273d5d4c2
commit 311120eca0
2 changed files with 26 additions and 20 deletions
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5
fs/ntfs/ChangeLog
View File

@ -76,11 +76,10 @@ ToDo/Notes:
- Truncate {a,c,m}time to the ntfs supported time granularity when
updating the times in the inode in ntfs_setattr().
- Fixup handling of sparse, compressed, and encrypted attributes in
fs/ntfs/inode.c::ntfs_read_locked_{,attr_,index_}inode().
fs/ntfs/inode.c::ntfs_read_locked_{,attr_,index_}inode(),
fs/ntfs/aops.c::ntfs_{read,write}page().
- Make ntfs_write_block() not instantiate sparse blocks if they contain
only zeroes.
- Fixup handling of sparse, compressed, and encrypted attributes in
fs/ntfs/aops.c::ntfs_writepage().
- Optimize fs/ntfs/aops.c::ntfs_write_block() by extending the page
lock protection over the buffer submission for i/o which allows the
removal of the get_bh()/put_bh() pairs for each buffer.

41
fs/ntfs/aops.c
View File

@ -379,31 +379,38 @@ retry_readpage:
return 0;
}
ni = NTFS_I(page->mapping->host);
/*
* Only $DATA attributes can be encrypted and only unnamed $DATA
* attributes can be compressed. Index root can have the flags set but
* this means to create compressed/encrypted files, not that the
* attribute is compressed/encrypted.
*/
if (ni->type != AT_INDEX_ROOT) {
/* If attribute is encrypted, deny access, just like NT4. */
if (NInoEncrypted(ni)) {
BUG_ON(ni->type != AT_DATA);
err = -EACCES;
goto err_out;
}
/* Compressed data streams are handled in compress.c. */
if (NInoNonResident(ni) && NInoCompressed(ni)) {
BUG_ON(ni->type != AT_DATA);
BUG_ON(ni->name_len);
return ntfs_read_compressed_block(page);
}
}
/* NInoNonResident() == NInoIndexAllocPresent() */
if (NInoNonResident(ni)) {
/*
* Only unnamed $DATA attributes can be compressed or
* encrypted.
*/
if (ni->type == AT_DATA && !ni->name_len) {
/* If file is encrypted, deny access, just like NT4. */
if (NInoEncrypted(ni)) {
err = -EACCES;
goto err_out;
}
/* Compressed data streams are handled in compress.c. */
if (NInoCompressed(ni))
return ntfs_read_compressed_block(page);
}
/* Normal data stream. */
/* Normal, non-resident data stream. */
return ntfs_read_block(page);
}
/*
* Attribute is resident, implying it is not compressed or encrypted.
* This also means the attribute is smaller than an mft record and
* hence smaller than a page, so can simply zero out any pages with
* index above 0.
* index above 0. Note the attribute can actually be marked compressed
* but if it is resident the actual data is not compressed so we are
* ok to ignore the compressed flag here.
*/
if (unlikely(page->index > 0)) {
kaddr = kmap_atomic(page, KM_USER0);