NTFS: Implement fs/ntfs/inode.[hc]::ntfs_truncate(). It only supports
uncompressed and unencrypted files. Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov
parent
2d86829b84
commit
dd072330d1
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@ -3,16 +3,14 @@ ToDo/Notes:
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- In between ntfs_prepare/commit_write, need exclusion between
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simultaneous file extensions. This is given to us by holding i_sem
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on the inode. The only places in the kernel when a file is resized
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are prepare/commit write and truncate for both of which i_sem is
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held. Just have to be careful in readpage/writepage and all other
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helpers not running under i_sem that we play nice...
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Also need to be careful with initialized_size extention in
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ntfs_prepare_write. Basically, just be _very_ careful in this code...
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UPDATE: The only things that need to be checked are read/writepage
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which do not hold i_sem. Note writepage cannot change i_size but it
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needs to cope with a concurrent i_size change, just like readpage.
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Also both need to cope with concurrent changes to the other sizes,
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i.e. initialized/allocated/compressed size, as well.
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are prepare/commit write and ntfs_truncate() for both of which i_sem
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is held. Just have to be careful in read-/writepage and other helpers
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not running under i_sem that we play nice... Also need to be careful
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with initialized_size extention in ntfs_prepare_write and writepage.
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UPDATE: The only things that need to be checked are
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prepare/commit_write as well as the compressed write and the other
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attribute resize/write cases like index attributes, etc. For now
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none of these are implemented so are safe.
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- Implement mft.c::sync_mft_mirror_umount(). We currently will just
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leave the volume dirty on umount if the final iput(vol->mft_ino)
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causes a write of any mirrored mft records due to the mft mirror
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@ -50,6 +48,8 @@ ToDo/Notes:
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- Add fs/ntfs/attrib.[hc]::ntfs_attr_extend_allocation(), a function to
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extend the allocation of an attributes. Optionally, the data size,
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but not the initialized size can be extended, too.
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- Implement fs/ntfs/inode.[hc]::ntfs_truncate(). It only supports
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uncompressed and unencrypted files.
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2.1.24 - Lots of bug fixes and support more clean journal states.
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491
fs/ntfs/inode.c
491
fs/ntfs/inode.c
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@ -30,6 +30,7 @@
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#include "debug.h"
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#include "inode.h"
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#include "attrib.h"
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#include "lcnalloc.h"
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#include "malloc.h"
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#include "mft.h"
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#include "time.h"
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@ -2291,11 +2292,16 @@ int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt)
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#ifdef NTFS_RW
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static const char *es = " Leaving inconsistent metadata. Unmount and run "
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"chkdsk.";
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/**
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* ntfs_truncate - called when the i_size of an ntfs inode is changed
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* @vi: inode for which the i_size was changed
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*
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* We do not support i_size changes yet.
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* We only support i_size changes for normal files at present, i.e. not
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* compressed and not encrypted. This is enforced in ntfs_setattr(), see
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* below.
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*
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* The kernel guarantees that @vi is a regular file (S_ISREG() is true) and
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* that the change is allowed.
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@ -2306,80 +2312,499 @@ int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt)
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* Returns 0 on success or -errno on error.
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*
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* Called with ->i_sem held. In all but one case ->i_alloc_sem is held for
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* writing. The only case where ->i_alloc_sem is not held is
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* writing. The only case in the kernel where ->i_alloc_sem is not held is
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* mm/filemap.c::generic_file_buffered_write() where vmtruncate() is called
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* with the current i_size as the offset which means that it is a noop as far
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* as ntfs_truncate() is concerned.
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* with the current i_size as the offset. The analogous place in NTFS is in
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* fs/ntfs/file.c::ntfs_file_buffered_write() where we call vmtruncate() again
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* without holding ->i_alloc_sem.
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*/
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int ntfs_truncate(struct inode *vi)
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{
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ntfs_inode *ni = NTFS_I(vi);
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s64 new_size, old_size, nr_freed, new_alloc_size, old_alloc_size;
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VCN highest_vcn;
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unsigned long flags;
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ntfs_inode *base_ni, *ni = NTFS_I(vi);
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ntfs_volume *vol = ni->vol;
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ntfs_attr_search_ctx *ctx;
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MFT_RECORD *m;
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ATTR_RECORD *a;
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const char *te = " Leaving file length out of sync with i_size.";
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int err;
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int err, mp_size, size_change, alloc_change;
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u32 attr_len;
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ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
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BUG_ON(NInoAttr(ni));
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BUG_ON(S_ISDIR(vi->i_mode));
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BUG_ON(NInoMstProtected(ni));
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BUG_ON(ni->nr_extents < 0);
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m = map_mft_record(ni);
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retry_truncate:
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/*
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* Lock the runlist for writing and map the mft record to ensure it is
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* safe to mess with the attribute runlist and sizes.
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*/
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down_write(&ni->runlist.lock);
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if (!NInoAttr(ni))
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base_ni = ni;
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else
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base_ni = ni->ext.base_ntfs_ino;
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m = map_mft_record(base_ni);
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if (IS_ERR(m)) {
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err = PTR_ERR(m);
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ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx "
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"(error code %d).%s", vi->i_ino, err, te);
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ctx = NULL;
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m = NULL;
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goto err_out;
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goto old_bad_out;
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}
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ctx = ntfs_attr_get_search_ctx(ni, m);
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ctx = ntfs_attr_get_search_ctx(base_ni, m);
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if (unlikely(!ctx)) {
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ntfs_error(vi->i_sb, "Failed to allocate a search context for "
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"inode 0x%lx (not enough memory).%s",
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vi->i_ino, te);
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err = -ENOMEM;
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goto err_out;
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goto old_bad_out;
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}
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err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
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CASE_SENSITIVE, 0, NULL, 0, ctx);
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if (unlikely(err)) {
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if (err == -ENOENT)
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if (err == -ENOENT) {
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ntfs_error(vi->i_sb, "Open attribute is missing from "
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"mft record. Inode 0x%lx is corrupt. "
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"Run chkdsk.", vi->i_ino);
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else
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"Run chkdsk.%s", vi->i_ino, te);
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err = -EIO;
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} else
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ntfs_error(vi->i_sb, "Failed to lookup attribute in "
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"inode 0x%lx (error code %d).",
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vi->i_ino, err);
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"inode 0x%lx (error code %d).%s",
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vi->i_ino, err, te);
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goto old_bad_out;
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}
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m = ctx->mrec;
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a = ctx->attr;
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/*
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* The i_size of the vfs inode is the new size for the attribute value.
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*/
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new_size = i_size_read(vi);
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/* The current size of the attribute value is the old size. */
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old_size = ntfs_attr_size(a);
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/* Calculate the new allocated size. */
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if (NInoNonResident(ni))
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new_alloc_size = (new_size + vol->cluster_size - 1) &
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~(s64)vol->cluster_size_mask;
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else
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new_alloc_size = (new_size + 7) & ~7;
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/* The current allocated size is the old allocated size. */
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read_lock_irqsave(&ni->size_lock, flags);
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old_alloc_size = ni->allocated_size;
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read_unlock_irqrestore(&ni->size_lock, flags);
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/*
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* The change in the file size. This will be 0 if no change, >0 if the
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* size is growing, and <0 if the size is shrinking.
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*/
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size_change = -1;
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if (new_size - old_size >= 0) {
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size_change = 1;
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if (new_size == old_size)
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size_change = 0;
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}
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/* As above for the allocated size. */
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alloc_change = -1;
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if (new_alloc_size - old_alloc_size >= 0) {
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alloc_change = 1;
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if (new_alloc_size == old_alloc_size)
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alloc_change = 0;
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}
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/*
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* If neither the size nor the allocation are being changed there is
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* nothing to do.
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*/
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if (!size_change && !alloc_change)
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goto unm_done;
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/* If the size is changing, check if new size is allowed in $AttrDef. */
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if (size_change) {
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err = ntfs_attr_size_bounds_check(vol, ni->type, new_size);
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if (unlikely(err)) {
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if (err == -ERANGE) {
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ntfs_error(vol->sb, "Truncate would cause the "
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"inode 0x%lx to %simum size "
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"for its attribute type "
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"(0x%x). Aborting truncate.",
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vi->i_ino,
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new_size > old_size ? "exceed "
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"the max" : "go under the min",
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le32_to_cpu(ni->type));
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err = -EFBIG;
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} else {
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ntfs_error(vol->sb, "Inode 0x%lx has unknown "
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"attribute type 0x%x. "
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"Aborting truncate.",
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vi->i_ino,
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le32_to_cpu(ni->type));
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err = -EIO;
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}
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/* Reset the vfs inode size to the old size. */
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i_size_write(vi, old_size);
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goto err_out;
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}
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a = ctx->attr;
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/* If the size has not changed there is nothing to do. */
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if (ntfs_attr_size(a) == i_size_read(vi))
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goto done;
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// TODO: Implement the truncate...
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ntfs_error(vi->i_sb, "Inode size has changed but this is not "
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"implemented yet. Resetting inode size to old value. "
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" This is most likely a bug in the ntfs driver!");
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i_size_write(vi, ntfs_attr_size(a));
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done:
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}
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if (NInoCompressed(ni) || NInoEncrypted(ni)) {
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ntfs_warning(vi->i_sb, "Changes in inode size are not "
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"supported yet for %s files, ignoring.",
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NInoCompressed(ni) ? "compressed" :
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"encrypted");
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err = -EOPNOTSUPP;
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goto bad_out;
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}
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if (a->non_resident)
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goto do_non_resident_truncate;
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BUG_ON(NInoNonResident(ni));
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/* Resize the attribute record to best fit the new attribute size. */
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if (new_size < vol->mft_record_size &&
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!ntfs_resident_attr_value_resize(m, a, new_size)) {
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unsigned long flags;
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/* The resize succeeded! */
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flush_dcache_mft_record_page(ctx->ntfs_ino);
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mark_mft_record_dirty(ctx->ntfs_ino);
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write_lock_irqsave(&ni->size_lock, flags);
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/* Update the sizes in the ntfs inode and all is done. */
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ni->allocated_size = le32_to_cpu(a->length) -
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le16_to_cpu(a->data.resident.value_offset);
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/*
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* Note ntfs_resident_attr_value_resize() has already done any
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* necessary data clearing in the attribute record. When the
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* file is being shrunk vmtruncate() will already have cleared
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* the top part of the last partial page, i.e. since this is
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* the resident case this is the page with index 0. However,
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* when the file is being expanded, the page cache page data
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* between the old data_size, i.e. old_size, and the new_size
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* has not been zeroed. Fortunately, we do not need to zero it
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* either since on one hand it will either already be zero due
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* to both readpage and writepage clearing partial page data
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* beyond i_size in which case there is nothing to do or in the
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* case of the file being mmap()ped at the same time, POSIX
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* specifies that the behaviour is unspecified thus we do not
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* have to do anything. This means that in our implementation
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* in the rare case that the file is mmap()ped and a write
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* occured into the mmap()ped region just beyond the file size
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* and writepage has not yet been called to write out the page
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* (which would clear the area beyond the file size) and we now
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* extend the file size to incorporate this dirty region
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* outside the file size, a write of the page would result in
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* this data being written to disk instead of being cleared.
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* Given both POSIX and the Linux mmap(2) man page specify that
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* this corner case is undefined, we choose to leave it like
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* that as this is much simpler for us as we cannot lock the
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* relevant page now since we are holding too many ntfs locks
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* which would result in a lock reversal deadlock.
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*/
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ni->initialized_size = new_size;
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write_unlock_irqrestore(&ni->size_lock, flags);
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goto unm_done;
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}
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/* If the above resize failed, this must be an attribute extension. */
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BUG_ON(size_change < 0);
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/*
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* We have to drop all the locks so we can call
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* ntfs_attr_make_non_resident(). This could be optimised by try-
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* locking the first page cache page and only if that fails dropping
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* the locks, locking the page, and redoing all the locking and
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* lookups. While this would be a huge optimisation, it is not worth
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* it as this is definitely a slow code path as it only ever can happen
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* once for any given file.
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*/
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ntfs_attr_put_search_ctx(ctx);
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unmap_mft_record(ni);
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unmap_mft_record(base_ni);
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up_write(&ni->runlist.lock);
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/*
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* Not enough space in the mft record, try to make the attribute
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* non-resident and if successful restart the truncation process.
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*/
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err = ntfs_attr_make_non_resident(ni, old_size);
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if (likely(!err))
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goto retry_truncate;
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/*
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* Could not make non-resident. If this is due to this not being
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* permitted for this attribute type or there not being enough space,
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* try to make other attributes non-resident. Otherwise fail.
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*/
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if (unlikely(err != -EPERM && err != -ENOSPC)) {
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ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, attribute "
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"type 0x%x, because the conversion from "
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"resident to non-resident attribute failed "
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"with error code %i.", vi->i_ino,
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(unsigned)le32_to_cpu(ni->type), err);
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if (err != -ENOMEM)
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err = -EIO;
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goto conv_err_out;
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}
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/* TODO: Not implemented from here, abort. */
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if (err == -ENOSPC)
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ntfs_error(vol->sb, "Not enough space in the mft record/on "
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"disk for the non-resident attribute value. "
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"This case is not implemented yet.");
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else /* if (err == -EPERM) */
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ntfs_error(vol->sb, "This attribute type may not be "
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"non-resident. This case is not implemented "
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"yet.");
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err = -EOPNOTSUPP;
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goto conv_err_out;
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#if 0
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// TODO: Attempt to make other attributes non-resident.
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if (!err)
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goto do_resident_extend;
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/*
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* Both the attribute list attribute and the standard information
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* attribute must remain in the base inode. Thus, if this is one of
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* these attributes, we have to try to move other attributes out into
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* extent mft records instead.
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*/
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if (ni->type == AT_ATTRIBUTE_LIST ||
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ni->type == AT_STANDARD_INFORMATION) {
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// TODO: Attempt to move other attributes into extent mft
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// records.
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err = -EOPNOTSUPP;
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if (!err)
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goto do_resident_extend;
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goto err_out;
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}
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// TODO: Attempt to move this attribute to an extent mft record, but
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// only if it is not already the only attribute in an mft record in
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// which case there would be nothing to gain.
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err = -EOPNOTSUPP;
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if (!err)
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goto do_resident_extend;
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/* There is nothing we can do to make enough space. )-: */
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goto err_out;
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#endif
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do_non_resident_truncate:
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BUG_ON(!NInoNonResident(ni));
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if (alloc_change < 0) {
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highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
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if (highest_vcn > 0 &&
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old_alloc_size >> vol->cluster_size_bits >
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highest_vcn + 1) {
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/*
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* This attribute has multiple extents. Not yet
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* supported.
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*/
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ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, "
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"attribute type 0x%x, because the "
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"attribute is highly fragmented (it "
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"consists of multiple extents) and "
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"this case is not implemented yet.",
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vi->i_ino,
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(unsigned)le32_to_cpu(ni->type));
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err = -EOPNOTSUPP;
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goto bad_out;
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}
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}
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/*
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* If the size is shrinking, need to reduce the initialized_size and
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* the data_size before reducing the allocation.
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*/
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if (size_change < 0) {
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/*
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* Make the valid size smaller (i_size is already up-to-date).
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*/
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write_lock_irqsave(&ni->size_lock, flags);
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if (new_size < ni->initialized_size) {
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ni->initialized_size = new_size;
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a->data.non_resident.initialized_size =
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cpu_to_sle64(new_size);
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}
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a->data.non_resident.data_size = cpu_to_sle64(new_size);
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write_unlock_irqrestore(&ni->size_lock, flags);
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flush_dcache_mft_record_page(ctx->ntfs_ino);
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mark_mft_record_dirty(ctx->ntfs_ino);
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/* If the allocated size is not changing, we are done. */
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if (!alloc_change)
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goto unm_done;
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/*
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* If the size is shrinking it makes no sense for the
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* allocation to be growing.
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*/
|
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BUG_ON(alloc_change > 0);
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} else /* if (size_change >= 0) */ {
|
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/*
|
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* The file size is growing or staying the same but the
|
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* allocation can be shrinking, growing or staying the same.
|
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*/
|
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if (alloc_change > 0) {
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/*
|
||||
* We need to extend the allocation and possibly update
|
||||
* the data size. If we are updating the data size,
|
||||
* since we are not touching the initialized_size we do
|
||||
* not need to worry about the actual data on disk.
|
||||
* And as far as the page cache is concerned, there
|
||||
* will be no pages beyond the old data size and any
|
||||
* partial region in the last page between the old and
|
||||
* new data size (or the end of the page if the new
|
||||
* data size is outside the page) does not need to be
|
||||
* modified as explained above for the resident
|
||||
* attribute truncate case. To do this, we simply drop
|
||||
* the locks we hold and leave all the work to our
|
||||
* friendly helper ntfs_attr_extend_allocation().
|
||||
*/
|
||||
ntfs_attr_put_search_ctx(ctx);
|
||||
unmap_mft_record(base_ni);
|
||||
up_write(&ni->runlist.lock);
|
||||
err = ntfs_attr_extend_allocation(ni, new_size,
|
||||
size_change > 0 ? new_size : -1, -1);
|
||||
/*
|
||||
* ntfs_attr_extend_allocation() will have done error
|
||||
* output already.
|
||||
*/
|
||||
goto done;
|
||||
}
|
||||
if (!alloc_change)
|
||||
goto alloc_done;
|
||||
}
|
||||
/* alloc_change < 0 */
|
||||
/* Free the clusters. */
|
||||
nr_freed = ntfs_cluster_free(ni, new_alloc_size >>
|
||||
vol->cluster_size_bits, -1, ctx);
|
||||
m = ctx->mrec;
|
||||
a = ctx->attr;
|
||||
if (unlikely(nr_freed < 0)) {
|
||||
ntfs_error(vol->sb, "Failed to release cluster(s) (error code "
|
||||
"%lli). Unmount and run chkdsk to recover "
|
||||
"the lost cluster(s).", (long long)nr_freed);
|
||||
NVolSetErrors(vol);
|
||||
nr_freed = 0;
|
||||
}
|
||||
/* Truncate the runlist. */
|
||||
err = ntfs_rl_truncate_nolock(vol, &ni->runlist,
|
||||
new_alloc_size >> vol->cluster_size_bits);
|
||||
/*
|
||||
* If the runlist truncation failed and/or the search context is no
|
||||
* longer valid, we cannot resize the attribute record or build the
|
||||
* mapping pairs array thus we mark the inode bad so that no access to
|
||||
* the freed clusters can happen.
|
||||
*/
|
||||
if (unlikely(err || IS_ERR(m))) {
|
||||
ntfs_error(vol->sb, "Failed to %s (error code %li).%s",
|
||||
IS_ERR(m) ?
|
||||
"restore attribute search context" :
|
||||
"truncate attribute runlist",
|
||||
IS_ERR(m) ? PTR_ERR(m) : err, es);
|
||||
err = -EIO;
|
||||
goto bad_out;
|
||||
}
|
||||
/* Get the size for the shrunk mapping pairs array for the runlist. */
|
||||
mp_size = ntfs_get_size_for_mapping_pairs(vol, ni->runlist.rl, 0, -1);
|
||||
if (unlikely(mp_size <= 0)) {
|
||||
ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
|
||||
"attribute type 0x%x, because determining the "
|
||||
"size for the mapping pairs failed with error "
|
||||
"code %i.%s", vi->i_ino,
|
||||
(unsigned)le32_to_cpu(ni->type), mp_size, es);
|
||||
err = -EIO;
|
||||
goto bad_out;
|
||||
}
|
||||
/*
|
||||
* Shrink the attribute record for the new mapping pairs array. Note,
|
||||
* this cannot fail since we are making the attribute smaller thus by
|
||||
* definition there is enough space to do so.
|
||||
*/
|
||||
attr_len = le32_to_cpu(a->length);
|
||||
err = ntfs_attr_record_resize(m, a, mp_size +
|
||||
le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
|
||||
BUG_ON(err);
|
||||
/*
|
||||
* Generate the mapping pairs array directly into the attribute record.
|
||||
*/
|
||||
err = ntfs_mapping_pairs_build(vol, (u8*)a +
|
||||
le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
|
||||
mp_size, ni->runlist.rl, 0, -1, NULL);
|
||||
if (unlikely(err)) {
|
||||
ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
|
||||
"attribute type 0x%x, because building the "
|
||||
"mapping pairs failed with error code %i.%s",
|
||||
vi->i_ino, (unsigned)le32_to_cpu(ni->type),
|
||||
err, es);
|
||||
err = -EIO;
|
||||
goto bad_out;
|
||||
}
|
||||
/* Update the allocated/compressed size as well as the highest vcn. */
|
||||
a->data.non_resident.highest_vcn = cpu_to_sle64((new_alloc_size >>
|
||||
vol->cluster_size_bits) - 1);
|
||||
write_lock_irqsave(&ni->size_lock, flags);
|
||||
ni->allocated_size = new_alloc_size;
|
||||
a->data.non_resident.allocated_size = cpu_to_sle64(new_alloc_size);
|
||||
if (NInoSparse(ni) || NInoCompressed(ni)) {
|
||||
if (nr_freed) {
|
||||
ni->itype.compressed.size -= nr_freed <<
|
||||
vol->cluster_size_bits;
|
||||
BUG_ON(ni->itype.compressed.size < 0);
|
||||
a->data.non_resident.compressed_size = cpu_to_sle64(
|
||||
ni->itype.compressed.size);
|
||||
vi->i_blocks = ni->itype.compressed.size >> 9;
|
||||
}
|
||||
} else
|
||||
vi->i_blocks = new_alloc_size >> 9;
|
||||
write_unlock_irqrestore(&ni->size_lock, flags);
|
||||
/*
|
||||
* We have shrunk the allocation. If this is a shrinking truncate we
|
||||
* have already dealt with the initialized_size and the data_size above
|
||||
* and we are done. If the truncate is only changing the allocation
|
||||
* and not the data_size, we are also done. If this is an extending
|
||||
* truncate, need to extend the data_size now which is ensured by the
|
||||
* fact that @size_change is positive.
|
||||
*/
|
||||
alloc_done:
|
||||
/*
|
||||
* If the size is growing, need to update it now. If it is shrinking,
|
||||
* we have already updated it above (before the allocation change).
|
||||
*/
|
||||
if (size_change > 0)
|
||||
a->data.non_resident.data_size = cpu_to_sle64(new_size);
|
||||
/* Ensure the modified mft record is written out. */
|
||||
flush_dcache_mft_record_page(ctx->ntfs_ino);
|
||||
mark_mft_record_dirty(ctx->ntfs_ino);
|
||||
unm_done:
|
||||
ntfs_attr_put_search_ctx(ctx);
|
||||
unmap_mft_record(base_ni);
|
||||
up_write(&ni->runlist.lock);
|
||||
done:
|
||||
/* Update the mtime and ctime on the base inode. */
|
||||
inode_update_time(VFS_I(base_ni), 1);
|
||||
if (likely(!err)) {
|
||||
NInoClearTruncateFailed(ni);
|
||||
ntfs_debug("Done.");
|
||||
return 0;
|
||||
err_out:
|
||||
if (err != -ENOMEM) {
|
||||
NVolSetErrors(vol);
|
||||
make_bad_inode(vi);
|
||||
}
|
||||
return err;
|
||||
old_bad_out:
|
||||
old_size = -1;
|
||||
bad_out:
|
||||
if (err != -ENOMEM && err != -EOPNOTSUPP) {
|
||||
make_bad_inode(vi);
|
||||
make_bad_inode(VFS_I(base_ni));
|
||||
NVolSetErrors(vol);
|
||||
}
|
||||
if (err != -EOPNOTSUPP)
|
||||
NInoSetTruncateFailed(ni);
|
||||
else if (old_size >= 0)
|
||||
i_size_write(vi, old_size);
|
||||
err_out:
|
||||
if (ctx)
|
||||
ntfs_attr_put_search_ctx(ctx);
|
||||
if (m)
|
||||
unmap_mft_record(ni);
|
||||
NInoSetTruncateFailed(ni);
|
||||
unmap_mft_record(base_ni);
|
||||
up_write(&ni->runlist.lock);
|
||||
out:
|
||||
ntfs_debug("Failed. Returning error code %i.", err);
|
||||
return err;
|
||||
conv_err_out:
|
||||
if (err != -ENOMEM && err != -EOPNOTSUPP) {
|
||||
make_bad_inode(vi);
|
||||
make_bad_inode(VFS_I(base_ni));
|
||||
NVolSetErrors(vol);
|
||||
}
|
||||
if (err != -EOPNOTSUPP)
|
||||
NInoSetTruncateFailed(ni);
|
||||
else
|
||||
i_size_write(vi, old_size);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in New Issue