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#include "store.h" |
#include "store.h" |
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/* Return 0 if STORE's range is enforced by the filesystem, otherwise an |
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error. */ |
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static error_t |
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enforced (struct store *store) |
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{ |
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if (store->num_runs != 1 || store->runs[0].start != 0) |
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/* Can't enforce non-contiguous ranges, or one not starting at 0. */ |
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return EINVAL; |
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else |
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{ |
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/* See if the the current (one) range is that the kernel is enforcing. */ |
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struct stat st; |
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error_t err = io_stat (store->port, &st); |
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if (!err |
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&& store->runs[0].length != (st.st_size >> store->log2_block_size)) |
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/* The single run is not the whole file. */ |
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err = EINVAL; |
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return err; |
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} |
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} |
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static error_t |
static error_t |
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file_read (struct store *store, |
file_read (struct store *store, |
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store_offset_t addr, size_t index, size_t amount, void **buf, |
store_offset_t addr, size_t index, size_t amount, void **buf, |
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} |
} |
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static error_t |
static error_t |
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file_store_set_size (struct store *store, size_t newsize) |
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{ |
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error_t err; |
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if (enforced (store) != 0) |
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/* Bail out if there is more than a single run. */ |
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return EOPNOTSUPP; |
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err = file_set_size (store->port, newsize); |
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if (!err) |
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{ |
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/* Update STORE's size and run. */ |
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store->size = newsize; |
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store->runs[0].length = newsize >> store->log2_block_size; |
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} |
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return err; |
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} |
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static error_t |
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file_decode (struct store_enc *enc, const struct store_class *const *classes, |
file_decode (struct store_enc *enc, const struct store_class *const *classes, |
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struct store **store) |
struct store **store) |
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{ |
{ |
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store->port = MACH_PORT_NULL; |
store->port = MACH_PORT_NULL; |
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} |
} |
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/* Return 0 if STORE's range is enforced by the filesystem, otherwise an |
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error. */ |
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static error_t |
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enforced (struct store *store) |
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{ |
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if (store->num_runs != 1 || store->runs[0].start != 0) |
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/* Can't enforce non-contiguous ranges, or one not starting at 0. */ |
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return EINVAL; |
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else |
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/* See if the the current (one) range is that the kernel is enforcing. */ |
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{ |
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struct stat st; |
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error_t err = io_stat (store->port, &st); |
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if (!err |
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&& store->runs[0].length != (st.st_size >> store->log2_block_size)) |
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/* The single run is not the whole file. */ |
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err = EINVAL; |
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return err; |
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} |
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} |
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static error_t |
static error_t |
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file_set_flags (struct store *store, int flags) |
file_set_flags (struct store *store, int flags) |
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const struct store_class |
const struct store_class |
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store_file_class = |
store_file_class = |
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{ |
{ |
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STORAGE_HURD_FILE, "file", file_read, file_write, |
STORAGE_HURD_FILE, "file", file_read, file_write, file_store_set_size, |
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store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, |
store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, |
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file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map |
file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map |
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}; |
}; |
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store_file_byte_class = |
store_file_byte_class = |
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{ |
{ |
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STORAGE_HURD_FILE, "file", file_byte_read, file_byte_write, |
STORAGE_HURD_FILE, "file", file_byte_read, file_byte_write, |
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file_store_set_size, |
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store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, |
store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, |
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file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map |
file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map |
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}; |
}; |