fs/ntfs3: Added comments to frecord functions

Added some comments in frecord.c for more context.
Also changed run_lookup to static because it's an internal function.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

diff --git a/fs/ntfs3/bitmap.c b/fs/ntfs3/bitmap.c
index e3b5680..bb9ebb1 100644 (file)
--- a/fs/ntfs3/bitmap.c
+++ b/fs/ntfs3/bitmap.c
@@ -1393,9 +1393,8 @@ int wnd_extend(struct wnd_bitmap *wnd, size_t new_bits)
 
 void wnd_zone_set(struct wnd_bitmap *wnd, size_t lcn, size_t len)
 {
-       size_t zlen;
+       size_t zlen = wnd->zone_end - wnd->zone_bit;
 
-       zlen = wnd->zone_end - wnd->zone_bit;
        if (zlen)
                wnd_add_free_ext(wnd, wnd->zone_bit, zlen, false);
 

diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index acd9f44..bc48923 100644 (file)
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -1287,7 +1287,7 @@ static int ni_expand_mft_list(struct ntfs_inode *ni)
        done = asize - run_size - SIZEOF_NONRESIDENT;
        le32_sub_cpu(&ni->mi.mrec->used, done);
 
-       /* Estimate the size of second part: run_buf=NULL. */
+       /* Estimate packed size (run_buf=NULL). */
        err = run_pack(run, svcn, evcn + 1 - svcn, NULL, sbi->record_size,
                       &plen);
        if (err < 0)
@@ -1317,6 +1317,7 @@ static int ni_expand_mft_list(struct ntfs_inode *ni)
        attr->name_off = SIZEOF_NONRESIDENT_LE;
        attr->flags = 0;
 
+       /* This function can't fail - cause already checked above. */
        run_pack(run, svcn, evcn + 1 - svcn, Add2Ptr(attr, SIZEOF_NONRESIDENT),
                 run_size, &plen);
 
@@ -1392,8 +1393,6 @@ int ni_expand_list(struct ntfs_inode *ni)
 
        /* Split MFT data as much as possible. */
        err = ni_expand_mft_list(ni);
-       if (err)
-               goto out;
 
 out:
        return !err && !done ? -EOPNOTSUPP : err;
@@ -1419,6 +1418,7 @@ int ni_insert_nonresident(struct ntfs_inode *ni, enum ATTR_TYPE type,
        u32 run_size, asize;
        struct ntfs_sb_info *sbi = ni->mi.sbi;
 
+       /* Estimate packed size (run_buf=NULL). */
        err = run_pack(run, svcn, len, NULL, sbi->max_bytes_per_attr - run_off,
                       &plen);
        if (err < 0)
@@ -1448,12 +1448,12 @@ int ni_insert_nonresident(struct ntfs_inode *ni, enum ATTR_TYPE type,
        attr->name_off = cpu_to_le16(name_off);
        attr->flags = flags;
 
+       /* This function can't fail - cause already checked above. */
        run_pack(run, svcn, len, Add2Ptr(attr, run_off), run_size, &plen);
 
        attr->nres.svcn = cpu_to_le64(svcn);
        attr->nres.evcn = cpu_to_le64((u64)svcn + len - 1);
 
-       err = 0;
        if (new_attr)
                *new_attr = attr;
 

diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index 83ed27b..7a728d3 100644 (file)
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -773,7 +773,6 @@ bool run_lookup_entry(const struct runs_tree *run, CLST vcn, CLST *lcn,
 void run_truncate(struct runs_tree *run, CLST vcn);
 void run_truncate_head(struct runs_tree *run, CLST vcn);
 void run_truncate_around(struct runs_tree *run, CLST vcn);
-bool run_lookup(const struct runs_tree *run, CLST vcn, size_t *index);
 bool run_add_entry(struct runs_tree *run, CLST vcn, CLST lcn, CLST len,
                   bool is_mft);
 bool run_collapse_range(struct runs_tree *run, CLST vcn, CLST len);

diff --git a/fs/ntfs3/run.c b/fs/ntfs3/run.c
index aba8ab1..4168b8a 100644 (file)
--- a/fs/ntfs3/run.c
+++ b/fs/ntfs3/run.c
@@ -31,7 +31,7 @@ struct ntfs_run {
  * Case of entry missing from list 'index' will be set to
  * point to insertion position for the entry question.
  */
-bool run_lookup(const struct runs_tree *run, CLST vcn, size_t *index)
+static bool run_lookup(const struct runs_tree *run, CLST vcn, size_t *index)
 {
        size_t min_idx, max_idx, mid_idx;
        struct ntfs_run *r;