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doc: warn that preallocation disables compression on btrfs #1692

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doc: warn that preallocation disables compression on btrfs #1692

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7 changes: 4 additions & 3 deletions doc/manual-src/en/aria2c.rst
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Expand Up @@ -1357,9 +1357,10 @@ Advanced Options
If you are using newer file systems such as ext4
(with extents support), btrfs, xfs or NTFS(MinGW build only), ``falloc`` is
your best choice. It allocates large(few GiB)
files almost instantly. Don't use ``falloc`` with
legacy file systems such as ext3 and FAT32 because it takes
almost same time as ``prealloc`` and it blocks aria2
files almost instantly. Note that btrfs disables compression when
pre-allocating, use ``trunc`` or ``none`` if you want compression.
Don't use ``falloc`` with legacy file systems such as ext3 and FAT32
because it takes almost same time as ``prealloc`` and it blocks aria2
entirely until allocation finishes. ``falloc`` may
not be available if your system doesn't have
:manpage:`posix_fallocate(3)` function.
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7 changes: 4 additions & 3 deletions doc/manual-src/pt/aria2c.rst
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Expand Up @@ -1204,9 +1204,10 @@ Opções Avançadas
If you are using newer file systems such as ext4
(with extents support), btrfs, xfs or NTFS(MinGW build only), ``falloc`` is
your best choice. It allocates large(few GiB)
files almost instantly. Don't use ``falloc`` with
legacy file systems such as ext3 and FAT32 because it takes
almost same time as ``prealloc`` and it blocks aria2
files almost instantly. Note that btrfs disables compression when
pre-allocating, use ``trunc`` or ``none`` if you want compression.
Don't use ``falloc`` with legacy file systems such as ext3 and FAT32
because it takes almost same time as ``prealloc`` and it blocks aria2
entirely until allocation finishes. ``falloc`` may
not be available if your system doesn't have
:manpage:`posix_fallocate(3)` function.
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13 changes: 8 additions & 5 deletions src/usage_text.h
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Expand Up @@ -138,12 +138,15 @@
" the file.\n" \
" If you are using newer file systems such as ext4\n" \
" (with extents support), btrfs, xfs or NTFS\n" \
" (MinGW build only), 'falloc' is your best\n" \
" (MinGW build only), 'falloc' is your best\n" \
" choice. It allocates large(few GiB) files\n" \
" almost instantly. Don't use 'falloc' with legacy\n" \
" file systems such as ext3 and FAT32 because it\n" \
" takes almost same time as 'prealloc' and it\n" \
" blocks aria2 entirely until allocation finishes.\n" \
" almost instantly. Note that btrfs disables\n" \
" compression when pre-allocating, use ``trunc``\n" \
" or ``none`` if you want compression. Don't use\n" \
" 'falloc' with legacy file systems such as ext3\n" \
" and FAT32 because it takes almost same time as\n" \
" 'prealloc' and it blocks aria2 entirely until\n" \
" allocation finishes.\n" \
" 'falloc' may not be available if your system\n" \
" doesn't have posix_fallocate() function.\n" \
" 'trunc' uses ftruncate() system call or\n" \
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